CN101136505B - Antenna and mancarried electronic aid - Google Patents
Antenna and mancarried electronic aid Download PDFInfo
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- CN101136505B CN101136505B CN200710148400.7A CN200710148400A CN101136505B CN 101136505 B CN101136505 B CN 101136505B CN 200710148400 A CN200710148400 A CN 200710148400A CN 101136505 B CN101136505 B CN 101136505B
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- inner circumferential
- rfid antenna
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Abstract
A kind of mancarried electronic aid with RFID function, possesses the RFID antenna being made up of the planar coil having wound conductor.This RFID antenna is the loop aerial in the ring footpath corresponding with the RFID of strong-electromagnetic field characteristic, and a part with certain coil beyond by its inner circumferential coil imports to be used for the antenna pattern of inner circumferential coil inside.In the case, by certain coil bending beyond inner circumferential coil or branch are imported to ratio inner circumferential coil inside, compensate the magnetic field intensity of antenna central part, even also be able to realize not produce can not the good communication of communication zone for the RFID of weak electromagnetic field characteristic.
Description
Technical field
The present invention relates to the RFID (RadioFrequency via electromagnetic field signal Yu external device communication
Identification, radio frequency identification) antenna and carry the mancarried electronic aid of this antenna.
Background technology
By carrying RFID function in the mancarried electronic aid of portable phone etc., it is achieved digicash function etc..At this
In the case of, by the reader/writer being equipped in such as shop etc. or the ticket-checking machine being equipped in railway etc.
The contactless communication of reader/writer etc. and mancarried electronic aid carries out clearing etc..
It is equipped with in the mancarried electronic aid via electromagnetic field signal and the RFID of external device communication, such as such
As disclosed in JP 2003-67692 publication, JP 2004-227046 publication, JP 2004-320571 publication etc. that
Sample, typically the battery container portion in equipment shell etc. are provided with the aerial coil of RFID.
In JP 2003-67692 publication, disclose and radio communication module is assembled on the battery cover of portable phone
And the structure being made of one, the nothing that the IC chip by aerial coil and being connected with this aerial coil and electromagnetic shielding component are constituted
Line communications module is integrally formed the inner side at battery cover.
During additionally, JP 2004-227046 publication uses electromagnetic field to communicate between automatic ticket checker
RFID device, at the substrate that the battery container portion of portable phone is provided with the aerial coil being printed with RFID, joins this aerial coil
Put in battery cover side.Specifically, on substrate, the swirl pattern with rectangle is printed with aerial coil, is connected with aerial coil
IC and resonance electricity container be arranged on substrate.
Additionally, JP 2004-320571 publication discloses in portable phone, in the outside of battery, is parallel to battery
Face and the reader/writer of RFID or the structure of the antenna of label are installed and antenna are installed at lid with covering
Structure.Here, label is built in the card of so-called prepaid, possess with swirl shape winding aerial coil and with this sky
The electrical connection of line coil, can the IC chip of intrinsic information of memory card holder.
In the RFID realized by such structure, it is generally of area (the coil anchor ring surrounded by the ring of aerial coil
Long-pending), characteristic that i.e. the biggest communication distance in ring footpath characteristic more improves.
Therefore, in the rfid system used in the automatic ticket checker etc. of transport body, use in reader/writer
The antenna that the longer antenna i.e. aspect ratio of communication distance is bigger, and also use aspect ratio bigger in the antenna of electronics ticket
Antenna, in order to user can be smoothly through.That is, it is the rfid system utilizing the characteristic as strong-electromagnetic field.
On the other hand, in the rfid system used in the electronic accounting machine in being arranged at shop etc. etc., in order to reliably
Prevent misconnection, reader/writer uses the antenna antenna that i.e. ring footpath is less that communication distance is shorter, and electronic money
The antenna of bag (prepaid card) also uses the antenna that aspect ratio is less.That is, it is the RFID system utilizing the characteristic as weak electromagnetic field
System.
Here, as long as using the different rfid card of each rfid system for utilizing, require even from system
Antenna performance difference is the most no problem, but in the case of RFID function is mounted in mancarried electronic aid, due to usual energy
Enough switchings etc. by prepayment utilize multiple rfid system, so being required to the antenna corresponding to multiple rfid systems.
But, in RFID use conventional aerial coil such as shown in Figure 14 A and Figure 14 B, due to be only with rotation
The vortex-like simple structure repeatedly wound, so being difficult to corresponding to both two kinds of above-mentioned rfid systems.
That is, if making the ring footpath of RFID antenna being mounted in mancarried electronic aid bigger, so as to adapt to automatically
The rfid system of ticket checking machine etc., then in situation about communicating with the reader/writer for digicash clearing in shop etc.
Lower it some times happens that communicate bad.
This is because, in loop aerial, although produce magnetic field at the looped conductor part of shape, but there is no the ring of conductor
Immediate vicinity magnetic field intensity step-down.Here, the aspect ratio reader/writer side of the loop aerial in mancarried electronic aid side
In the case of the ring footpath of loop aerial is big, the core of the loop aerial of mancarried electronic aid close to corresponding to reader/
The position of write device.In the case, owing to the magnetic field intensity of the core of loop aerial is relatively low, so intersecting between the two
Magnetic flux tail off.
Here, owing to using load modulation system in RFID, if so magnetic flux tails off, load modulation signal becomes
Weak, can produce so-called close to Null can not communication zone.If produce such can not communication zone, even if then can occur
Mancarried electronic aid is hidden situation about can not communicate on electronic accounting machine.
Summary of the invention
It is an object of the invention to provide a kind of antenna and mancarried electronic aid, they are in rfid system, not only with antenna
The bigger strong-electromagnetic field reader/writer in ring footpath, and the weak electromagnetic field reader less with the ring footpath of antenna/
The communication of write device also is able to reliably carry out.
In order to achieve the above object, the loop aerial of the 1st technical scheme of the present invention, by the planar coil having wound conductor
Constitute, it is characterised in that there is following antenna pattern, this antenna pattern using in the conductor of above-mentioned winding as the line of inner circumferential
A part for certain coil beyond circle imports to than the above-mentioned coil inside as inner circumferential.
In order to achieve the above object, the mancarried electronic aid of the 2nd technical scheme of the present invention, there is RFID function, it is special
Levy and be, possess antenna that be made up of the planar coil having wound conductor, for above-mentioned RFID function；Above-mentioned antenna be with by force
The loop aerial in the ring footpath corresponding for RFID of electromagnetic nature, have using in the conductor of above-mentioned winding as inner circumferential coil with
A part for certain outer coil imports to the antenna pattern than the above-mentioned coil inside as inner circumferential.
According to the present invention, the reader/writer of not only bigger with the aspect ratio of antenna strong-electromagnetic field and antenna
The communication of the reader/writer of the weak electromagnetic field that aspect ratio is less also is able to reliably carry out.
Accompanying drawing explanation
Fig. 1 is the figure of the outward appearance representing the state opened by the foldable cellular phone of embodiments of the present invention.
Fig. 2 is the figure of the rear side representing the 1st housing under the state fold the portable telephone of Fig. 1.
Fig. 3 is the in-built sectional view of the portable telephone representing the single dotted broken line X-X ' shown in Fig. 2.
Fig. 4 is the in-built exploded perspective view representing the 1st housing.
Fig. 5 A is to represent battery cover and antenna and the exploded perspective view of the stickup example of battery absorbing sheet.
Fig. 5 B is the axonometric chart representing the battery cover after having pasted antenna and battery absorbing sheet.
Fig. 6 A is the top view of the structure of the RFID antenna representing embodiments of the present invention 1.
Fig. 6 B is the axonometric chart of the conductor coils representing the RFID antenna shown in Fig. 6 A.
Fig. 7 A is the characteristic of the RFID antenna as embodiments of the present invention 1 and represents the single dotted broken line shown in Fig. 6 B
The CURRENT DISTRIBUTION of A-A ' and the figure of magnetic field intensity.
Fig. 7 B is the characteristic as conventional RFID antenna and represents that the electric current of the single dotted broken line Z-Z ' shown in Figure 14 divides
Cloth and the figure of magnetic field intensity.
Fig. 7 C is conventional shown in characteristic and Fig. 7 B of the RFID antenna by the relevant embodiment 1 shown in Fig. 7 A
The figure that the features superimposition of RFID antenna represents.
Fig. 8 A is the top view of the structure of the RFID antenna representing embodiments of the present invention 2.
Fig. 8 B is the axonometric chart of the conductor coils representing the RFID antenna shown in Fig. 8 A.
Fig. 9 A is conventional shown in characteristic and Fig. 7 B of the RFID antenna by the relevant embodiment 1 shown in Fig. 7 A
The figure that the features superimposition of RFID antenna represents.
Fig. 9 B is the characteristic of the RFID antenna as embodiments of the present invention 2 and represents the single dotted broken line shown in Fig. 8 B
The CURRENT DISTRIBUTION of B-B ' and the figure of magnetic field intensity.
Fig. 9 C is conventional shown in characteristic and Fig. 7 B of the RFID antenna by the relevant embodiment 2 shown in Fig. 9 B
The figure that the features superimposition of RFID antenna represents.
Figure 10 A is the top view of the structure of the RFID antenna representing embodiments of the present invention 3.
Figure 10 B is the axonometric chart of the conductor coils representing the RFID antenna shown in Figure 10 A.
Figure 11 A is the characteristic of the RFID antenna as embodiments of the present invention 3 and represents that the single-point shown in Figure 10 B is drawn
The CURRENT DISTRIBUTION of line C-C ' and the figure of magnetic field intensity.
Figure 11 B is conventional shown in characteristic and Fig. 7 B of the RFID antenna by the relevant embodiment 3 shown in Figure 11 A
The figure that the features superimposition of RFID antenna represents.
Figure 11 C is characteristic and the relevant reality shown in Fig. 7 A of the RFID antenna by the relevant embodiment 3 shown in Figure 11 A
The figure that the features superimposition of the RFID antenna executing mode 1 represents.
Figure 12 A is the top view of the structure of the RFID antenna representing embodiments of the present invention 4.
Figure 12 B is the axonometric chart of the conductor coils representing the RFID antenna shown in Figure 12 A.
Figure 13 A is the characteristic of the RFID antenna as embodiments of the present invention 4 and represents that the single-point shown in Figure 12 B is drawn
The CURRENT DISTRIBUTION of line D-D ' and the figure of magnetic field intensity.
Figure 13 B is conventional shown in characteristic and Fig. 7 B of the RFID antenna by the relevant embodiment 3 shown in Figure 11 A
The figure that the features superimposition of RFID antenna represents.
Figure 13 C is conventional shown in characteristic and Fig. 7 B of the RFID antenna by the relevant embodiment 4 shown in Figure 13 A
The figure that the features superimposition of RFID antenna represents.
Figure 14 A is the top view of the structure representing conventional RFID antenna.
Figure 14 B is the axonometric chart of the conductor coils representing the RFID antenna shown in Figure 14 A.
Detailed description of the invention
Hereinafter, it is explained in detail with reference to the accompanying drawings for implementing the preferred embodiment of the present invention.
Here, in case of the mancarried electronic aid of the present invention is implemented as foldable cellular phone, enter
Row following description.The portable telephone 100 of present embodiment, in addition to as the voice call function of basic function, has use
Carry out using the RFID of the clearing of digicash etc. by carrying out radio communication with the reader/writer of regulation
(RadioFrequency Identification) function.
Structure hereinafter, with reference to the accompanying drawings of the portable telephone 100 of present embodiment.Fig. 1 represents present embodiment
The outward appearance of the state that foldable cellular phone 100 is opened.As it can be seen, by the 1st housing the 1 and the 2nd housing 2 via hinge 3
Mutually fold and link the portable telephone 100 constituting present embodiment freely.
Here, on the 1st housing 1, possess the operating portion being made up of various keys etc. and call mike.Additionally, the 2nd
On housing 2, possess main display part 5 and call speaker etc..
Fig. 2 is the outward appearance of the rear side representing the 1st housing under the state fold the portable telephone shown in Fig. 1
Figure, the direction CL shown in the arrow in figure represents the closedown direction of the sliding battery cover 8 of the rear side composition at the 1st housing 1,
Direction OP represents the opening direction of battery cover 8.
Fig. 3 is the sectional view of the section of the portable telephone 100 representing the single dotted broken line X-X ' shown in Fig. 2.As it can be seen,
In the 1st housing 1, contain circuit substrate 6, set of cells 7 etc..Set of cells 7 clips circuit substrate 6 and is arranged in and operating portion 4 phase
Toss about, covered by battery cover 8.It addition, on the 2nd housing 2, be provided with secondary display part 9 etc..Secondary display part 9 is arranged in aobvious with main
Show opposition side, portion 5.
Fig. 4 is the in-built exploded perspective view representing the 1st housing 1.As it can be seen, the 1st housing 1 is by assembling lower machine
Shell 11, upper casing 12 and middle casing 13 and constitute.
Lower casing 11 and upper casing 12 are the most resinous exterior casing, and middle casing 13 is the metal of such as magnesium alloy etc.
Members of frame processed.Further, by lower casing 11 and the behaviour of composition the 1st housing of the exterior part of the bottom surface side by constituting the 1st housing
The upper casing 12 of the exterior part making side, face comprises middle casing 13 and assembles, and constitutes the 1st housing 1.
In the 1st housing 1 of such structure, lower casing 11 is formed for housing as portable telephone 100
The peristome (battery container peristome) of set of cells 7 of action power.When using portable telephone 100, by by electricity
Pond group 7 is inserted from the battery container of lower casing 11 peristome, set of cells 7 is maintained in middle casing 13.
Thus, battery cover 8 is constituted removably with lower casing 11, and the battery container making battery cover 8 cover lower casing 11 is used
Peristome.Therefore, around the battery container peristome of lower casing 11, it is formed and is used for fixing the multiple solid of battery cover 8
Determine recess 41,42,43,44,45.
In middle casing 13, include in addition to the circuit substrate 6 of various circuit of RFID circuit except being fixed with installation, structure
Become to have contact spring 27a, the 27b for being electrically connected by battery cover 8 with circuit substrate 6.
Additionally, on the 1st housing, the most as shown in Figure 4, constitute in side surface part and have side switch 14,15 etc..In the 1st housing
It is configured with the tab (not shown) passing to circuit substrate 6 for the signal pressed that would correspond to such side switch.In these feelings
Under condition, constitute and have for making the portion of terminal of tab contact the tab supporting part 13 ' in the portion of terminal of each side switch 14,15.In this reality
Execute in mode, highlighted by the part making metal middle casing 13, constitute tab supporting part 13 '.
Here, as shown in Figure 4, in the present embodiment, on the medial surface of battery cover 8 constitute have RFID antenna 20 and
Electric wave absorption sheet 31.The details of such battery cover 8 is described with reference to Fig. 5 A and Fig. 5 B.
Fig. 5 A is used to the solid of the explanation RFID antenna 20 in the medial surface composition of battery cover 8 and electric wave absorption sheet 31
Figure, Fig. 5 B is to represent the axonometric chart that RFID antenna 20 and electric wave absorption sheet 31 are pasted onto the state on the medial surface of battery cover 8.
As shown in Figure 5A, at the periphery of the medial surface of battery cover 8, be provided with for by respectively be located at lower casing 11
Attachment recess 41,42,43,44,45 (with reference to Fig. 4) around battery container peristome combines and is fixed on down by battery cover 8
Retaining lugs 81,82,83,84,85 in casing 11.
Additionally, the central part of the medial surface at battery cover 8, it is pasted with RFID antenna 20 and electric wave absorption sheet 31.RFID
The flexible base board being formed with aerial coil for example by conductive pattern with antenna 20 is constituted.At this RFID with one of antenna 20
On face, being pasted with the electric wave absorption sheet 31 of ferrite sheet by two sides splicing tape etc., another face is viscous by two sides splicing tape etc.
It is attached on the medial surface of battery cover 8.
At RFID with in antenna 20, as shown in Figure 5A, prominent composition has a pair antenna terminal 22a and 22b.If will so
RFID antenna 20 bond on battery cover 8, the most as shown in Figure 5 B, with a pair lid side terminal being formed on battery cover 8
86a, 86b contact.Here, antenna terminal 22a contacts with lid side terminal 86a, and antenna terminal 22b contacts with lid side terminal 86b.
In the edge of battery cover 8, by covering towards the prominent respective upper surface portion of terminal board 87a, 87b constituted of lower casing 11
Metal parts constitute lid side terminal 86a, 86b.When battery cover 8 is fixed on the 1st housing 1, this terminal board 87a, 87b via
It is formed at the notch of the vicinity of the attachment recess 43,44 shown in Fig. 4 and reaches contact spring 27a, 27b of middle casing 13.By
This, the lid side terminal 86a being formed on terminal board 87a contacts with contact spring 27a, the lid side being formed on terminal board 87b
Sub-86b contacts with contact spring 27b, so the circuit in RFID antenna the 20 and the 1st housing 1 that will be formed on battery cover 8
Substrate 6 electrically connects.
Then, the antenna pattern of the RFID antenna 20 being arranged on battery cover 8 is illustrated.
Before the antenna pattern of the RFID antenna of the explanation present invention, conventional general with reference to Figure 14 A and Figure 14 B explanation
The antenna pattern of RFID antenna.Figure 14 A is the top view representing conventional RFID antenna, and Figure 14 B is to represent its conductor
The axonometric chart of coil (antenna pattern).
As shown in Figure 14 A and Figure 14 B, the conventional RFID antenna being arranged on portable telephone is such as corresponding to installing
Battery cover shape, be made up of the loop aerial of the planar coil winding aerial coil abreast.
Such RFID antenna being mounted in portable telephone 100 is in order at the reader/writer with regulation
Between carry out loading the wireless near field communication of modulation system and using.In the present embodiment, such as by be mounted in
Reader/writer communication in the automatic ticket checker of railway carries out rfid system (hereinafter referred to as " the ticket checking use of freight charges clearing
RFID ") or by carrying out, with the reader/writer communication of the cash register being in linkage with shop, clearing that commodity buy
Rfid system (hereinafter referred to as " cash register RFID ") etc. use.
Here, also use loop aerial in reader/writer side, but in such loop aerial, have by ring bag
The i.e. coil loop area of the area enclosed is the biggest, more becomes strong-electromagnetic field characteristic, the characteristic of communication distance characteristic raising.
In ticket checking RFID, it is desirable to long communication distance characteristic, in order to user can be smoothly through.Cause
This, in ticket checking RFID, the strong-electromagnetic field reader of the loop aerial that utilization use coil loop area (ring footpath) is bigger/write
Enter device (strong-electromagnetic field RFID).
On the other hand, in cash register RFID, in order to prevent contacing by mistake, it is desirable to comparatively short communication distance characteristic.Cause
This, in cash register RFID, utilization uses the weak electromagnetic field of the loop aerial that coil loop area (ring footpath) is less to read
Device/write device (weak electromagnetic field RFID).
In the present embodiment, it is assumed that by the RFID function of portable telephone 100, it is possible to use with above-mentioned strong-electromagnetic field
Reader/writer and weak electromagnetic field reader/writer carry out RFID communication.
Here, if making RFID antenna and the weak electromagnetic field reader/writer being mounted in portable telephone 100
Antenna loop footpath coupling, then can not obtain the communication distance characteristic needed in ticket checking RFID.Thus, Figure 14 A and Figure 14 B is made
The ring footpath of shown conventional RFID antenna is made up of the ring footpath corresponding to strong-electromagnetic field RFID.
It addition, conventional with shown in Figure 14 A and Figure 14 B of the RFID antenna of the embodiments of the present invention shown below
RFID antenna as basic structure.Thus, the RFID antenna of the embodiments of the present invention has and ticket checking RFID
Deng ring footpath corresponding for high-intensity magnetic field RFID.
Embodiment 1
RFID antenna 20 with reference to Fig. 6 A and Fig. 6 B explanation embodiments of the present invention 1.Fig. 6 A is to represent this embodiment party
The RFID of the formula top view of the structure of antenna 20, Fig. 6 B is the conductor coils 23 representing the RFID antenna 20 shown in Fig. 6 A
Axonometric chart.
The RFID of present embodiment with antenna 20 as shown in Figure 6A, by basic framework 21, antenna terminal 22a, 22b with lead
Body coil 23 is constituted.
Basic framework 21 is made up of the flexible base board etc. of the shape mated with the form and dimension of battery cover 8.Such as Fig. 6 A institute
Showing, basic framework 21 is in the shape by central part opening, by conductive pattern is formed at such basic framework with swirl shape
On the one side of 21, form loop aerial.That is, the size of the peristome of basic framework 21 is based on being required by RFID antenna 20
The size in ring footpath.
Conductor coils 23 is such as made up of the metal wire as conductor, by from an antenna terminal 22a to another
The planar coil that terminal 22b winds on the same face point-blank is constituted.
In the present embodiment, as shown in Figure 6A, it is wound so that becoming outermost from the wire of antenna terminal 22a
In week, the wire becoming inner circumferential is attached to the conductive pattern on antenna 22b.In the case, if conductor coils 23 has wound n
Circle, the most peripheral part (the 1st week) making conductor coils 23 is most peripheral coil 231, to make inner peripheral portion be inner circumferential coil 23n。
The basic structure of RFID antenna 20 indicated above is common in the embodiments of the present invention.
Here, the conductor coils 23 of present embodiment is characterised by, as shown in Fig. 6 A and Fig. 6 B, it is by by outermost
All coils 231A part (such as straight line portion) bending formed local import to than inner circumferential coil 23nThe bending of inside
Portion 231DAntenna pattern.
Illustrate to be formed with the characteristic of the RFID antenna 20 of such conductor coils 23 with reference to Fig. 7 A～Fig. 7 C.
Fig. 7 A is the figure of CURRENT DISTRIBUTION and the magnetic field intensity representing the single dotted broken line A-A ' shown in Fig. 6 B.
Here, in order to compare characteristic and the characteristic of conventional RFID antenna of the RFID antenna 20 of present embodiment,
Represent the structure shown in Figure 14 A and Figure 14 B, the characteristic of conventional RFID antenna in figure 7b.That is, Fig. 7 B is to represent figure
The CURRENT DISTRIBUTION of the single dotted broken line Z-Z ' shown in 14B and the figure of magnetic field intensity.
Conventional shown in the characteristic of the overlapping RFID antenna 20 representing the present embodiment shown in Fig. 7 A and Fig. 7 B
The figure of the characteristic of RFID antenna is Fig. 7 C.In fig. 7 c, dotted line represents the characteristic of conventional RFID antenna, and solid line represents this
The RFID of the embodiment characteristic of antenna 20.
The RFID antenna 20 of present embodiment is owing to being formed through than inner circumferential coil 23nThe kink of inside
231D, so as in Fig. 7 C by shadow representation, the magnetic field intensity at the central part of RFID antenna 20 is than conventional RFID antenna
High.
As it has been described above, the RFID antenna being mounted in the portable telephone 100 of present embodiment due to have corresponding to
The bigger ring footpath of high-intensity magnetic field RFID, so having the characteristic of the magnetic field intensity step-down of the overall central part office of antenna.Make
Such RFID antenna is close to the feelings of the weak electromagnetic field reader/writer using the less loop aerial of aspect ratio
Under condition, the flux intersected between the two tails off.As a result, load modulation signal dies down, and produces so-called can not lead to close to Null
Letter region.
RFID according to present embodiment antenna 20, as seen in figure 7 c, owing to can make the magnetic field intensity of core
It is higher than conventional RFID antenna, even if so in the case of the reader/writer of weak electromagnetic field, it is also possible to
Compensating the magnetic field intensity in center of antenna portion, the magnetic flux intersected between the two will not reduce.
That is, because not occurring impedance not between the reader/writer of less weak electromagnetic field, the ring footpath at antenna
Join and electromagnetic coupled die down bring can not the generation of communication zone (close to Null).
Thus, not only and between the reader/writer of the bigger strong-electromagnetic field in the ring footpath of antenna, also have and antenna
Communication between the reader/writer of the weak electromagnetic field that ring footpath is less also is able to reliably carry out.I.e., not only with automatically
Use in ticket checking machine etc., such as communication distance is the strong-electromagnetic field reader/writer of 10～20cm, also have with at electronics
The communication of weak electromagnetic field reader/writer that use in accounting machine etc., that such as communication distance is less than 5cm also is able to can
Carry out by ground.
Embodiment 2
In embodiment 1, by by the RFID most peripheral coil 23 of the conductor coils 23 of antenna 201Bend and constitute
Compensate the kink 23 of the magnetic field intensity in center of antenna portion1DBut it also may by most peripheral coil 231Part bending in addition.
The conductor coils 23 of RFID antenna 20 now is represented in Fig. 8 A and Fig. 8 B.As it can be seen, in this enforcement
The conductor coils 23 formed on the RFID antenna 20 of mode is characterised by having antenna pattern, and this antenna pattern passes through will
From most peripheral coil 231The inner side coil of 1 week is i.e. as coil that is the 2nd week coil 23 of the 2nd week2A part (such as line part
Point) bending, it is formed with local and imports to than inner circumferential coil 23nThe kink 23 of inside2D。
Here, most peripheral coil 23 is made1Bending embodiment 1 RFID with antenna 20 as seen in figure 7 c, with conventional
The magnetic field intensity that can improve central part compared by RFID antenna, but then, such as shadow representation in Fig. 9 A, most peripheral coil
231The magnetic field intensity of the neighbouring i.e. outer edge of loop aerial becomes lower than conventional RFID antenna.This is because, owing to making
Periphery coil 231Locally bend, so most peripheral coil 231Pattern local disappear and do not produce magnetic field.
Although as it has been described above, the RFID antenna 20 of present embodiment made with for strong-electromagnetic field reader/
The bigger ring footpath of the loop aerial coupling of write device, but make the most peripheral coil 23 of the conductor coils 23 of formation loop aerial1
In the structure of the embodiment 1 locally bent, the situation that the size of ring correspondingly diminishes is roughly the same.Thus, in ticket checking
In the case of the strong-electromagnetic field rfid system requiring communication distance characteristic to reduce with RFID etc. uses, communication distance characteristic sometimes
Can reduce.
In contrast, the conductor coils 23 of present embodiment is not owing to being to make most peripheral coil 231Bending, but make the 2nd
All coils 232Bending, so leaving most peripheral coil 231Pattern.The RFID antenna of such conductor coils 23 will be used
The personality presentation of 20 is in figures 9 b and 9.Fig. 9 B is the CURRENT DISTRIBUTION representing the single dotted broken line B-B ' shown in Fig. 8 B and magnetic field intensity
Figure.
By the conventional RFID antenna shown in the characteristic of the RFID antenna 20 of such present embodiment and Fig. 7 B
That features superimposition represents is Fig. 9 C.In Fig. 9 C, dotted line represents the characteristic of conventional RFID antenna, and solid line represents this embodiment party
The RFID of the formula characteristic of antenna 20.
Here, as Fig. 9 C uses shadow representation, according to the RFID antenna 20 of present embodiment, central part can not only be made
The magnetic field intensity divided is higher than conventional RFID antenna, and the magnetic field intensity of antenna outer edge can be made also than conventional RFID
High with antenna.
That is, that can not only prevent from occurring because the magnetic field intensity of core is relatively low and weak electromagnetic field reader/
During write device communication can not the generation of communication zone, but also be able to maintain that and leading to strong-electromagnetic field reader/writer
The communication distance characteristic required during letter.
Thus, not only and between the reader/writer of the bigger strong-electromagnetic field in the ring footpath of antenna and the ring footpath of antenna
Communication between the reader/writer of less weak electromagnetic field also is able to reliably carry out.
Embodiment 3
In embodiment 1 and embodiment 2, make by making the part bending of conductor coils 23 compensate antenna
The structure of the magnetic field intensity of central part but it also may by from a part (such as straight line portion) branch of conductor coils 23, come
Form the conductive pattern of the magnetic field intensity compensating core.
In the present embodiment, as an example, with reference to Figure 10 A and Figure 10 B explanation from the most peripheral coil of conductor coils 23
231The structure of branch.Figure 10 A is the top view of the RFID antenna 20 representing present embodiment, and Figure 10 B is to represent this embodiment party
The axonometric chart of the conductor coils 23 of formula.
As shown in Figure 10 A and Figure 10 B, the conductor coils 23 of present embodiment is characterised by having following antenna diagram
Case, this antenna pattern is by from most peripheral coil 231Branch also imports to than inner circumferential coil 23nMost peripheral is returned to behind inside
Coil 231And form the by-pass portion 23 of bypass1S。
The characteristic using the RFID antenna 20 of the conductor coils 23 of such structure is shown in Figure 11 A.Figure 11 A is to represent
The CURRENT DISTRIBUTION of the single dotted broken line C-C ' shown in Figure 10 B and the figure of magnetic field intensity.
By the characteristic of the RFID antenna 20 of the present embodiment shown in Figure 11 A and conventional RFID days shown in Fig. 7 B
That the features superimposition of line represents is Figure 11 B.In Figure 11 B, dotted line represents the characteristic of conventional RFID antenna, and solid line represents this
The RFID of the embodiment characteristic of antenna 20.
As Figure 11 B used shadow representation, according to the RFID antenna 20 of the conductor coils 23 using present embodiment, it is possible to
The magnetic field intensity making core is higher than conventional RFID antenna.I.e., it is possible to prevent close to weak electromagnetic field reader/
During write device because of magnetic flux deficiency causes generation can not communication zone.
In above-mentioned embodiment 1 and embodiment 2, also be able to obtain such effect, but such as embodiment 1 and
In the case of embodiment 2 makes the part bending of conductor coils 23 compensate the magnetic field intensity of core like that, sometimes in
The magnetic field intensity of heart part can uprise as more than required.This is because, owing to the electric current former state of the coil in bending is in inner circumferential
Coil 23nInner side pass through, so the magnetic field intensity of the magnitude of current corresponding to conductor coils 23 can be produced at kink.
Here, in the case of the magnetic field intensity in heart portion is relatively low in antennas, as mentioned above, although using with weak electromagnetic field
Between reader/writer intersect magnetic flux reduce and produce can not communication zone, but even if magnetic field intensity uprise into need
More than Yaoing, also have when with the communication of weak electromagnetic field reader/writer that produce can not the situation of communication zone.Though that is,
So carry out channel radio with RFID antenna 20 as resonant circuit function respectively by the antenna of reader/writer
Letter, but make the magnetic field intensity height of core to needing the above RFID antenna 20 feelings close to reader/writer
Under condition, magnetic coupling between the two become too strong, and mutual resonant frequency can deviation.Result, it is impossible to receive and dispatch desired frequency efficiently
The signal of rate, produce sometimes substantially below 1mm left and right can not communication zone.
Here, according to the structure of the conductor coils 23 of present embodiment, due to from most peripheral coil 231The by-pass portion of branch
231SBy inner circumferential coil 23nInner side, so most peripheral coil 231Current distributing and flow to by-pass portion 231SIn.Thus,
The magnetic field intensity in center of antenna portion will not become as by conductor coils 23 a part bending time high.
With reference to Figure 11 C, such characteristic is described.Figure 11 C is by the RFID antenna 20 of the present embodiment shown in Figure 11 A
The figure that represents of the features superimposition of RFID antenna 20 of characteristic and the embodiment 1 shown in Fig. 7 A.That is, it is to compare from most peripheral
Coil 231The situation (present embodiment) of branch and make most peripheral coil 231The figure of the situation (embodiment 1) of bending, at figure
In 11C, dotted line represents the characteristic of the RFID antenna 20 of embodiment 1, and solid line represents the RFID antenna 20 of present embodiment
Characteristic.
The RFID of present embodiment by the magnetic field intensity of the core of antenna 20 as shown in Figure 11 B, than conventional RFID
High with antenna, but as shown in Figure 11 C, lower than the RFID antenna 20 of embodiment 1.
Additionally, due to the conductor coils 23 of present embodiment is by from most peripheral coil 231The branch of branch and define
By-pass portion 231S, so leaving most peripheral coil 231Pattern.Thus, as shown in Figure 11 C, it is possible to make the magnetic of antenna outer edge
Field intensity is also high than the RFID antenna 20 of embodiment 1.
That is, according to the RFID antenna 20 of present embodiment, when communicating with weak electromagnetic field reader/writer,
Can not only prevent from producing because the magnetic field intensity of core is relatively low can not communication zone, but also be prevented from because magnetic field is strong
Spending height and produce can not communication zone.Additionally, can obtain when communicating with strong-electromagnetic field reader/writer sufficiently
Communication distance characteristic.
Thus, not only and between the reader/writer of the bigger strong-electromagnetic field in the ring footpath of antenna and the ring footpath of antenna
The communication of the reader/writer of less weak electromagnetic field also is able to reliably carry out.
Embodiment 4
In embodiment 3, illustrate the most peripheral coil 23 from conductor coils 231The example of branch but it also may from
Most peripheral coil 231A part (such as straight line portion) branch of coil in addition.
RFID antenna 20 and the conductor coils 23 of above-mentioned situation is represented in Figure 12 A and Figure 12 B.Figure 12 A is to represent this
The RFID of the embodiment top view of antenna 20, Figure 12 B is the axonometric chart representing the conductor coils 23 shown in Figure 12 A.
As it can be seen, the conductor coils 23 formed in the RFID antenna 20 of present embodiment is characterised by having
Following antenna pattern, this antenna pattern passes through most peripheral coil 231The inner side coil of 1 week is i.e. as coil that is the 2nd of the 2nd week
All coils 232Branch also imports to than inner circumferential coil 23nThe 2nd week coil 23 is returned to behind inside2Define the side of bypass
Logical portion 232S。
The characteristic of the RFID antenna 20 of the conductor coils 23 of such structure is used with reference to Figure 13 A～Figure 13 C explanation.
Figure 13 A is the figure of CURRENT DISTRIBUTION and the magnetic field intensity representing the single dotted broken line D-D ' shown in Figure 12 B.
The conductor coils 23 of present embodiment with the conductor coils 23 represented in embodiment 3 similarly, since branch
By-pass portion is led to than inner circumferential coil 23nInside, so as embodiment 3, the magnetic field intensity in center of antenna portion is fitted
Local compensation.
Here, RFID days of embodiment 3 will be characterized with the branch construct as present embodiment in Figure 13 B
The characteristic of line 20 represents with the features superimposition of the conventional RFID antenna shown in Fig. 7 B.As Figure 13 B used shadow representation, in reality
Execute in the RFID antenna 20 of mode 3, have the situation that the magnetic field intensity of antenna outer edge reduces than conventional RFID antenna.
This is because, from most peripheral coil 231In the case of the embodiment 3 of branch, flow through most peripheral coil 231's
Electric current is divided to by-pass portion 231SIn, so while leave most peripheral coil 231Pattern, most peripheral coil 231Electric current
Or can relative reduction.
In contrast, at the RFID of present embodiment with in antenna 20, due to from the 2nd of conductor coils 23 the week coil 232
Branch's by-pass portion 232S, so most peripheral coil 231Pattern former state retain.Thus, enough electric currents are had to flow to outermost contour
Circle 231In, so the situation that magnetic field intensity reduces in antenna outer edge will not occur as Embodiment 3.
Figure 13 C is the characteristic of the RFID antenna 20 of such present embodiment to be used with the conventional RFID shown in Fig. 7 B
The features superimposition of antenna represents.As Figure 13 C used shadow representation, according to the RFID antenna 20 of present embodiment, with conventional
The magnetic field intensity that can improve antenna outer edge compared by RFID antenna.
Can obtain not producing when communicating with weak electromagnetic field reader/writer can not in heart portion i.e., in antennas
The suitable magnetic field intensity of communication zone, and enough can obtain reading with strong-electromagnetic field in the generation of antenna outer edge
The magnetic field intensity of the communication distance characteristic required during device/write device communication.
Thus, not only and between the reader/writer of the bigger strong-electromagnetic field in the ring footpath of antenna and the ring footpath of antenna
The communication of the reader/writer of less weak electromagnetic field also is able to reliably carry out.
As described above, according to the embodiment of the present invention, due to one of the conductor coils by making RFID antenna
Bending or branch is divided to import to ratio inner circumferential coil inside, it is possible to compensate the magnetic field intensity in center of antenna portion, even if so
Correspond to the antenna in the ring footpath of strong-electromagnetic field reader/writer, it is also possible to carry out and weak electromagnetic field reader/write
Enter the good communication of device.
It addition, the magnetic field strength characteristics obtained by the RFID antenna of the present invention is as shown in the respective embodiments described above, remove
Because of bending or branch or beyond changing because making which coil bending or branch, always according to constituting kink or bypass
Length and the position of the conductor in portion and change.
Additionally, to the characteristic of RFID antenna requirement because of the size of battery cover installed and shape, the apparatus main body of installation
The various conditions of internal structure etc. and different.Thus, by make to be formed at the kink in the RFID antenna of the present invention or
The most appropriates such as the length of by-pass portion and position, it is possible to be readily derived the antenna performance of requirement.
In the case, illustrated such in embodiment 1 and embodiment 2, the structure that makes the conductor of antenna bend
In the case of making, in order to change length and the position of kink, need design and the manufacture of conductor coils entirety, but if real
Execute such branch construct shown in mode 3 and embodiment 4, as long as then preparing the by-pass portion of various length and shape to existing
Loop aerial additional the most permissible, so the degree of freedom of the design of RFID antenna and manufacture is higher, it is possible to more easily obtain
The antenna of the characteristic being suitable for.
It addition, the kink shown in the respective embodiments described above or the length of by-pass portion, shape, position and make bending
Or a simply example such as the coil of branch, however it is not limited to illustrate.
Here, kink or the position of by-pass portion are set by the internal structure of the device corresponding to installing RFID antenna
Put, it is also possible to prevent the reduction of the communication distance characteristic that the reason beyond magnetic field strength characteristics as described above brings.
Such as, as shown in Figure 4, tab is being formed by making a part for casing 13 in the metal system of magnesium alloy etc. prominent
In the case of supporting part 13 ' etc. are such, produce overcurrent by this metal part sometimes, have communication distance under its influence to become
Short situation.In this case, if kink or the by-pass portion of RFID antenna are arranged on and the gold as reason
Genus portion close proximity, then can reduce the high frequency electric of the periphery flowing to this metal portion.As a result, at tab supporting part 13 ' etc.
Metal portion periphery produce overcurrent also tail off, it is possible to prevent the harmful effect making communication distance shorten.
All may be used it addition, the coil being formed with kink or by-pass portion of the RFID antenna of the present invention is the coil in which week
With, but it is preferably coil beyond inner circumferential coil.That is, himself it is exactly the magnetic affecting center of antenna portion due to inner circumferential coil
Field intensity, even if so arrange kink or by-pass portion, the change of the magnetic field intensity in center of antenna portion on such coil
The most less.Compensate in antenna accordingly, for the good communication in order to also realize with weak electromagnetic field reader/writer
The magnetic field intensity in heart portion, arranges kink in the coil beyond inner circumferential coil or by-pass portion is effective.
It addition, in the above embodiment, it is set to foldable cellular phone as mancarried electronic aid, but this
Bright it is not limited to this, it is also possible to be the electronic equipment of PDA, other pockets.
Additionally, be the structure arranging flexible base board on the inner face of battery cover in embodiments but it also may be to arrange
Inner face at the back side casing (lower casing 11) of the rear side of constitution equipment casing or back side cap etc., other cabinet parts interior
Structure on face or surface.And then, the shape etc. of battery cover and antenna is arbitrary, additionally, for concrete detail structure etc.
Certainly it also is able to suitably change.
It addition, the application is based on Japanese patent application No. 2006-236847 that on August 31st, 2006 proposes,
Record content in this application to be included in this specification.
Claims (4)
1. a loop aerial, is made up of the planar coil having wound conductor, it is characterised in that
There is the antenna pattern of by-pass portion, described by-pass portion be by using in the conductor of above-mentioned winding as inner circumferential coil with
A part of branch of certain outer coil also imports to be formed than the above-mentioned coil inside as inner circumferential.
2. antenna as claimed in claim 1, it is characterised in that above-mentioned loop aerial is RFID antenna, by with strong-electromagnetic field
The ring footpath corresponding for RFID of characteristic is formed.
3. a mancarried electronic aid, has RFID function, it is characterised in that
Possesses antenna that be made up of, for above-mentioned RFID function the planar coil having wound conductor；
Above-mentioned antenna is the loop aerial in the ring footpath corresponding with the RFID of strong-electromagnetic field characteristic, has the antenna diagram comprising by-pass portion
Case, described by-pass portion is by a part as certain coil beyond the coil of inner circumferential in the conductor of above-mentioned winding being divided
Prop up and import to be formed than the above-mentioned coil inside as inner circumferential.
4. mancarried electronic aid as claimed in claim 3, it is characterised in that above-mentioned antenna has and imports to than above-mentioned conduct
It is upper that the part of the coil inside of inner circumferential is formed at in the metal parts close proximity within above-mentioned mancarried electronic aid
State antenna pattern.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006236847 | 2006-08-31 | ||
| JP236847/2006 | 2006-08-31 | ||
| JP185969/2007 | 2007-07-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101136505A CN101136505A (en) | 2008-03-05 |
| CN101136505B true CN101136505B (en) | 2016-12-14 |
Family
ID=
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5541399A (en) * | 1994-09-30 | 1996-07-30 | Palomar Technologies Corporation | RF transponder with resonant crossover antenna coil |
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5541399A (en) * | 1994-09-30 | 1996-07-30 | Palomar Technologies Corporation | RF transponder with resonant crossover antenna coil |
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