CA2177050C - Dielectric antenna - Google Patents
Dielectric antennaInfo
- Publication number
- CA2177050C CA2177050C CA002177050A CA2177050A CA2177050C CA 2177050 C CA2177050 C CA 2177050C CA 002177050 A CA002177050 A CA 002177050A CA 2177050 A CA2177050 A CA 2177050A CA 2177050 C CA2177050 C CA 2177050C
- Authority
- CA
- Canada
- Prior art keywords
- dielectric
- slots
- planar conductor
- disposed
- strip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/061—Two dimensional planar arrays
- H01Q21/064—Two dimensional planar arrays using horn or slot aerials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/10—Resonant slot antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/20—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/28—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave comprising elements constituting electric discontinuities and spaced in direction of wave propagation, e.g. dielectric elements or conductive elements forming artificial dielectric
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
- H01Q21/0037—Particular feeding systems linear waveguide fed arrays
- H01Q21/0068—Dielectric waveguide fed arrays
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
- H01Q3/2658—Phased-array fed focussing structure
Abstract
A dielectric antenna is provided which is capable of setting the radiation of electromagnetic waves at a desired angle. The dielectric antenna has a nonradiative dielectric guide (an NRD
guide) of a construction in which a dielectric strip is sandwiched between a first planar conductor and a second planar conductor. A
dielectric resonator is disposed between the first planar conductor and the second planar conductor along the extension line of the dielectric strip, and a plurality of slots are disposed in the second planar conductor above the dielectric resonator and symmetrically with respect to the dielectric resonator.
guide) of a construction in which a dielectric strip is sandwiched between a first planar conductor and a second planar conductor. A
dielectric resonator is disposed between the first planar conductor and the second planar conductor along the extension line of the dielectric strip, and a plurality of slots are disposed in the second planar conductor above the dielectric resonator and symmetrically with respect to the dielectric resonator.
Description
~ 7050 DIELECTRIC ANTENNA
The present invention relates to a dielectric antenna using a - ' v~ dielectric wave guide (an NRD guide) for use for S example in an obstruction detector for ~ li..6 car accidents, in a radio ~ , or in another i ~ or receiving device.
The inventors of the present invention have filed Japanese Patent ~rrl;~"ti No. 7-1506 ~~ ~ v this type of dielectric antenna. In the following desrrirtit-n, an XYZ coordinate system is 10 used in which the center of gravity of a dielectric resonator 14 is the point of origin, the extension direction of a dielectric strip 13 is the X direction, and the direction vertical to the principal plane of a conductor 12 is the Z direction.
A ~ . ' dielectric antenna shown in Figs. 7-9 15 comprises a first planar conductor 11, and a second planar conductor 12. Disposed between the first planar conductor 11 and the second planar conductor 12 are a dielectric strip 13 and a dielectric resonator 14 spaced from each other along the X a~cis.
One end 13a of the dielectric strip 13 is connected to a waveguide 20 and a i circuit (not shovn), and the other end 13b is an open end. Provided in the second planar conductor 12 above the dielectric resonator 14 is a single slot 12a ~ b~ lly parallel to the X axis. In this way, the dielectric strip 13 is placed bet veen the first planar conductor 11 and the second planar conductor 12, thus 25 forming an NRD guide.
As sho vn in Fig. 10, a dielectric lens 15 is disposed above the slot 12a, and thus a dielectric lens antenna is formed. The ,L-u~ -6ll~t;c waves i ' from the ~ 6 ;de, and the trAncn~iCc;~)n circuit to the dielectric strip 13 are p-up~ d within 30 the dielectric strip 13 in an LSM (T~ Section Magnetic) mode with their electric field having ~ . within the YZ
plane and their magnetic field having , within the XZ
plane. The dielectric strip 13 and the dielectric resonator 14 are y coupled, so that an ~I_tl~ _ - wave of an HEll~ mode having electric-field , in the X direction occurs within the dielectric resonator 14. The el~ c wave generated in the dielectric resonator 14 is radiated outside through the slot 12a and the dielectric lens 15.
However, when the broadside Ji~i ' axis provided by the slot 12a is the Z axis, the radiation within the XZ plane (~H plane~) along the length of the slot 12a is within a range of ~ 'y i45 with the Z axis as the center. However, the radiation angle within the YZ plane ("E plane~) becomes i90 or more, including ~l~cll, ~ -- field , which are not radiated to the lS dielectric lens lS (aspill-over loss~).
It is an object of the present invention to provide a dielectric antenna which is capable of setting the radiation of the el~l~ wave radiated outside the dielectric antenna at a desired angle and which is capable of reducing the spill-over loss.
To achieve the above-described object, according to one aspect of the present invention, there is provided a dielectric antenna including a l~olllad~ ivt~ dielectric guide having a dielectric strip located between a first planar conductor and a second planar conductor, wherein at least one dielectric resonator is disposed along an extension line of the dielectric strip, and a plurality of --~ly palallel slots are disposed within the second planar conductor in point symmetry with respect to the dielectric resonator and ~b~sr~ y above the dielectric resonator.
According to another aspect of the present invention, there is 30 provided a dielectric antenna including a ~( ' ve dielectric ~7~050 guide having a dielectric strip sandwiched between a first planar conductor and a second planar conductor, wherein at least one dielectric resonator is disposed along the extension line of the dielectric strip, and a plurality of ~ ~Iy parallel slots are 5 disposed in the second planar conductor in line symmetry with respect to the dielectric strip, above and in the vicinity of the dielectric resonator.
According to a further aspect of the present invention, a dielectric lens is disposed above a slot provided within the second lO planar conductor.
Generally, in a linear array antenna, the radiation di pattern of the antenna along the plane in which plural slots are aligned, is expressed by the following equation:
E(w) = sin (Nu/2)1sin(u/2) (l) lS u = kd(cos ~ - cos ~ 0) (V
where k is the phase constant, d is the distance between respective slots, N is the number of slots and ~ 0 is the radiating direction of a main beam.
In accul.l~ with the above equation, it can be clearly 20 1 ' i that when N is constant, the radiation angle at which a F,ower of the main beam is attenuated to l/lO of its ma~imum power, is inversely ~ ' to the distance d.
And the opening area S depends on the distance d. The antenna gain G is . ~ by the opening area S, the 25 ~ A and the opening efflciency 17. These satisfy the following equation:
G = 4 7r S ~ (3) If the opening efflciency is kept constant, the larger the opening area S the larger the gain G. Therefore, in the present 30 invention, since a plurality of slots are provided within the second 21770~
planar conductor above a dielectric resonator, the effective opening area along the E plane of the slots becomes wider than in the .. 1 dielectric antenna, and the radiation angle becomes narrower, and thus the antenna gain is improved. Further, since the S coupling between the slots and the dielectric resonator is strong (though the theoretical b~ . ' for this fact is yet to be clarified), the antenna gain is improved.
Further, in another aspect of the present imention, another dielectric resonator having a pass band which is generally narrower than that of the antenna is disposed between the dielectric strip and the dielectric resonator. Thus, the pass band of the antenna becomes narrower, and its spurious rejection ability is improved.
On the other hand, near the peak of the pass band, the pass band width becomes wider than that of the original antenna, so its signal passing 1~ ~ f~ ;C in the vicinity of an intended frequency is improved.
In addition, a dielectric antenna having a high gain can be realized by providing a dielectric lens above the slot so as to - the ~l~L~ wave near the slot.
The above and further objects, aspects and novel features of the invention will become more apparent from the follo ving detailed ~ crrjrti~ when read in cn~ ~cti~r~ with the a- C~ a~
drawings.
A presently preferred ~ of the present invention will now be described, by way of example only, with reference to the a~wllll,~.,;l~g drawings, in which:
Fig. 1 is an exploded view of a dielectric antenna of an .,II,odil~ of the present invention;
Fig. 2 is a plan view of the dielectric antenna of the ellll,odi---~ lll of the present invention;
2177~0 .
Fig. 3 is a sectional view of the dielectric antenna of the c~ " of the present invention taken along the line A-A of Fig. 2;
Fig 4 is a plan view of a dielectric antenna of a second . ' of the present invention;
Fig. 5 is a p,.~Livo view of a dielectric antenna of a third c.,L~- " of the present invention;
Figs. 6A and 6B show slots provided in other of the present invention;
Fig. 7 is an exploded view of a . _ ' dielectric antenna;
Fig. 8 is a plan view of the . -~n~ dielectric antenna;
Fig. 9 is a sectional view of the . _ ' dielectric antenna taken along the line B-B of Fig. 8;
Fig. 10 is a ~.~livo view of the conventional dielectric antenna having a dielectric lens mounted therein;
Fig. I l is a radiation ~iirectil7n ~I pattern diagram showing radiation along the E plane from the slots in the dielectric antenna of an example of the present invention; and Fig. 12 is a radiation ~ n-~l pattern diagram of radiation along the E plane from the slot in the ~ ' dielectric antenna.
Preferred c...l,~- ' of the present invention will be described below with reference to the r-- . ~;.g drawings.
A dielectric antenna shown in Figs. 1-3 includes a first planar conductor (a reverso conductor plate) I and a second planar conductor (an obverse conductor plate) 2. Disposed between the first planar conductor I and the second planar conductor 2 are a dielectric strip 3 and a dielectric resonator 4 spaced from each other along the X axis. Two l~Lm6~ll~ slots 2a and 2b are provided in ~ 2~7705~
parallel and at equal distances from the center line of the dielectric strip 3 within the second planar conductor 2 and above the dielectric resonator 4. The center lines along the length of the slots 2a and 2b are tangent to the outer periphely of the dielectric resonator 4.
An end portion 3a of the dielectric strip 3 is connected to a waveguide and a; ~n circuit (not shown), and the other end portion 3b is an open end. The ~ in which the dielectric strip 3 is ~ d between the first planar conductor I and the second planar conductor 2 ~f an NRD guide.
Next, the operation of this . ' ' will be described.
The ele~ , ' ~ waves i ~ from the ~ , the circuit and the like to the dielectric strip 3 propagate within the dielectric strip 3 in an LSM (~ Section Magnetic) mode which causes an electric field having ~, within the YZ plane and a magnetic field having ~. ~ within the XZ plane. The dielectric strip 3 and the dielectric resonator 4 are el~ , "y coupled, whereby an ~ wave of an IIEI 11 mode having electric-field c r ' in the same direction as that of the LSM mode of the dielectric strip 3 occurs within the dielectric rwonator 4. The el~ c wave is radiated by the dielectric resonator 4 via the slots 2a and 2b.
In this ~.o-l ~ since the two slots 2a and 2b are provided in the second planar conductor 2 in paraUel with the center line of the second planar conductor 2 and in line symmetry with respect to the center line of the dielectric strip 3, the effective opening area of the E plane (the YZ plane in Fig. I) becomw wide, and the radiation angle becomes sharp.
Next, a second ~ b~- " of the present invention will be described with reference to Fig. 4. In this . ' ' t, in addition 30 to the elements included in the first; ',o li~ ,l, a second dielectric ~ 2177050 resonator 4a is disposed between the dielectric strip 3 and the dielectric resonator 4. Since the other . , of this ' - - are the same as those of the first ' - ' t, the ~ , are given the same reference numerals, and a 5 ~ thereof is omitted.
In this . L ' t, since the second dielectric resonator 4a is added, the filtering effect is improved, making it possible to shut out ~ - or to achieve a greater bandwidth in the vicinity of the passband of tne filter.
Next, a third c.l.L~- ' of the present invention will be described with reference to Fig. 5. In this ' ' t, the dielectric antenna of the first . ~~ ' is housed in a housing 6, and a dielectric lens S is disposed above the slots 2a and 2b, thus the directivity and the gain of the radiation cl~ - wave are 15 improved. In tnis ' ' t, based on the equations (I) and (2), the spacing between the slots was adjusted to 0.45 - 0.5 ~ to realize the radiation angle ~(45 - 60) thereby most of the el~ - waves radiated from the slots 2a and 2b are applied onto the dielectric lens 5.
20 Although the above-described respectiw .. Lc ' describe a case in which the slots 2a and 2b are disposed parallel to the center line of the dielectric resonator 4, the slots may not be parallel to the center line of the dielectric strip 3, as illustrated by slots 2c and 2d in Fig. 6A. This is due to the reason that the 25 coupling of the slots and the HEl 11 mode are achieved to a certain degree even in such an ., Such an ~ , of slots may be used if desired for . in ~ 1~ the antennas.
Generally speaking, it is permitted for a plurality of - ~ y parallel slots to be arranged at positions ~ y in ~ ~17705~
point symmetry with respect to the dielectric resonator 4. Fig. 6B
shows a case in which other slots 2e and 2f which are ' '1y parallel to the slots 2a and 2b are disposed to the outside of the slots 2a and 2b. When, as described above, the number of slots is four, S the effective opening area along the E plane becomes wider, and thus the beam width can be made narrower.
Next, a specific example of the present invention will be described. For the sal~e of ~ , l, a prior art case is also shown. The conditions are as shown in the table below.
Table 1 The present invention Prior art Reference fiqure Fiq. 4 Fi~. 7 Number of slots 2 Size of slots Length: 10 mm Same as left Width: O . 4 mm Same as left Diameter of 11.9 mm Same as left radiator The radiation directional pattern along the E plane of the primary radiator measured in the above specific example, is shown in Fig. I l (the present invention) and Fig. 12 (the prior art). It can be, ' ~ from these Figs. I l and 12 that the directivity along 25 the E plane of the present invention having two slots is sharper than that of the prior art having one slot. That is, in Fig. 11 of the present invention, the radiation angle of a 10 dB drop of the main beam in the E plane is i45 f}om the center of the main beam, while in Fig. 12 of the prior art, the radiation angle is ~110.
30 Further, while the antenna efficiency of the example of the present ` 21~70~0 g invention is 44%, the antenna efflciency of the prior art example is 30%. The antenna efficiency of the present invention is improved by ~~ , 10% over that of the prior art. The antenna efficiency is expressed by the ratio of the gain obtained 5 ~ r 'Iy to the dil~Loflal gain calculated ~hpnretirslly from the ~ - ' pattern.
Many different e ': ' of the present imention may be Cu~ Ll ' ~ without departing from the spirit and scope of the present invention. It should be I ' ~ ~ that the present invention 10 is not limited to the specific ~,...I,c ' described in this ~r~rifirq~il To the contrary, the present invention is intended to cover various ~ qtit)n~ and equivalent ~ included within the spirit and scope of the invention as hereafter claimed.
Tne scope of the following claims is to be accorded the broadest 111. SO as to ~ ~ - all such - "~ , equivalent structures and functions.
The present invention relates to a dielectric antenna using a - ' v~ dielectric wave guide (an NRD guide) for use for S example in an obstruction detector for ~ li..6 car accidents, in a radio ~ , or in another i ~ or receiving device.
The inventors of the present invention have filed Japanese Patent ~rrl;~"ti No. 7-1506 ~~ ~ v this type of dielectric antenna. In the following desrrirtit-n, an XYZ coordinate system is 10 used in which the center of gravity of a dielectric resonator 14 is the point of origin, the extension direction of a dielectric strip 13 is the X direction, and the direction vertical to the principal plane of a conductor 12 is the Z direction.
A ~ . ' dielectric antenna shown in Figs. 7-9 15 comprises a first planar conductor 11, and a second planar conductor 12. Disposed between the first planar conductor 11 and the second planar conductor 12 are a dielectric strip 13 and a dielectric resonator 14 spaced from each other along the X a~cis.
One end 13a of the dielectric strip 13 is connected to a waveguide 20 and a i circuit (not shovn), and the other end 13b is an open end. Provided in the second planar conductor 12 above the dielectric resonator 14 is a single slot 12a ~ b~ lly parallel to the X axis. In this way, the dielectric strip 13 is placed bet veen the first planar conductor 11 and the second planar conductor 12, thus 25 forming an NRD guide.
As sho vn in Fig. 10, a dielectric lens 15 is disposed above the slot 12a, and thus a dielectric lens antenna is formed. The ,L-u~ -6ll~t;c waves i ' from the ~ 6 ;de, and the trAncn~iCc;~)n circuit to the dielectric strip 13 are p-up~ d within 30 the dielectric strip 13 in an LSM (T~ Section Magnetic) mode with their electric field having ~ . within the YZ
plane and their magnetic field having , within the XZ
plane. The dielectric strip 13 and the dielectric resonator 14 are y coupled, so that an ~I_tl~ _ - wave of an HEll~ mode having electric-field , in the X direction occurs within the dielectric resonator 14. The el~ c wave generated in the dielectric resonator 14 is radiated outside through the slot 12a and the dielectric lens 15.
However, when the broadside Ji~i ' axis provided by the slot 12a is the Z axis, the radiation within the XZ plane (~H plane~) along the length of the slot 12a is within a range of ~ 'y i45 with the Z axis as the center. However, the radiation angle within the YZ plane ("E plane~) becomes i90 or more, including ~l~cll, ~ -- field , which are not radiated to the lS dielectric lens lS (aspill-over loss~).
It is an object of the present invention to provide a dielectric antenna which is capable of setting the radiation of the el~l~ wave radiated outside the dielectric antenna at a desired angle and which is capable of reducing the spill-over loss.
To achieve the above-described object, according to one aspect of the present invention, there is provided a dielectric antenna including a l~olllad~ ivt~ dielectric guide having a dielectric strip located between a first planar conductor and a second planar conductor, wherein at least one dielectric resonator is disposed along an extension line of the dielectric strip, and a plurality of --~ly palallel slots are disposed within the second planar conductor in point symmetry with respect to the dielectric resonator and ~b~sr~ y above the dielectric resonator.
According to another aspect of the present invention, there is 30 provided a dielectric antenna including a ~( ' ve dielectric ~7~050 guide having a dielectric strip sandwiched between a first planar conductor and a second planar conductor, wherein at least one dielectric resonator is disposed along the extension line of the dielectric strip, and a plurality of ~ ~Iy parallel slots are 5 disposed in the second planar conductor in line symmetry with respect to the dielectric strip, above and in the vicinity of the dielectric resonator.
According to a further aspect of the present invention, a dielectric lens is disposed above a slot provided within the second lO planar conductor.
Generally, in a linear array antenna, the radiation di pattern of the antenna along the plane in which plural slots are aligned, is expressed by the following equation:
E(w) = sin (Nu/2)1sin(u/2) (l) lS u = kd(cos ~ - cos ~ 0) (V
where k is the phase constant, d is the distance between respective slots, N is the number of slots and ~ 0 is the radiating direction of a main beam.
In accul.l~ with the above equation, it can be clearly 20 1 ' i that when N is constant, the radiation angle at which a F,ower of the main beam is attenuated to l/lO of its ma~imum power, is inversely ~ ' to the distance d.
And the opening area S depends on the distance d. The antenna gain G is . ~ by the opening area S, the 25 ~ A and the opening efflciency 17. These satisfy the following equation:
G = 4 7r S ~ (3) If the opening efflciency is kept constant, the larger the opening area S the larger the gain G. Therefore, in the present 30 invention, since a plurality of slots are provided within the second 21770~
planar conductor above a dielectric resonator, the effective opening area along the E plane of the slots becomes wider than in the .. 1 dielectric antenna, and the radiation angle becomes narrower, and thus the antenna gain is improved. Further, since the S coupling between the slots and the dielectric resonator is strong (though the theoretical b~ . ' for this fact is yet to be clarified), the antenna gain is improved.
Further, in another aspect of the present imention, another dielectric resonator having a pass band which is generally narrower than that of the antenna is disposed between the dielectric strip and the dielectric resonator. Thus, the pass band of the antenna becomes narrower, and its spurious rejection ability is improved.
On the other hand, near the peak of the pass band, the pass band width becomes wider than that of the original antenna, so its signal passing 1~ ~ f~ ;C in the vicinity of an intended frequency is improved.
In addition, a dielectric antenna having a high gain can be realized by providing a dielectric lens above the slot so as to - the ~l~L~ wave near the slot.
The above and further objects, aspects and novel features of the invention will become more apparent from the follo ving detailed ~ crrjrti~ when read in cn~ ~cti~r~ with the a- C~ a~
drawings.
A presently preferred ~ of the present invention will now be described, by way of example only, with reference to the a~wllll,~.,;l~g drawings, in which:
Fig. 1 is an exploded view of a dielectric antenna of an .,II,odil~ of the present invention;
Fig. 2 is a plan view of the dielectric antenna of the ellll,odi---~ lll of the present invention;
2177~0 .
Fig. 3 is a sectional view of the dielectric antenna of the c~ " of the present invention taken along the line A-A of Fig. 2;
Fig 4 is a plan view of a dielectric antenna of a second . ' of the present invention;
Fig. 5 is a p,.~Livo view of a dielectric antenna of a third c.,L~- " of the present invention;
Figs. 6A and 6B show slots provided in other of the present invention;
Fig. 7 is an exploded view of a . _ ' dielectric antenna;
Fig. 8 is a plan view of the . -~n~ dielectric antenna;
Fig. 9 is a sectional view of the . _ ' dielectric antenna taken along the line B-B of Fig. 8;
Fig. 10 is a ~.~livo view of the conventional dielectric antenna having a dielectric lens mounted therein;
Fig. I l is a radiation ~iirectil7n ~I pattern diagram showing radiation along the E plane from the slots in the dielectric antenna of an example of the present invention; and Fig. 12 is a radiation ~ n-~l pattern diagram of radiation along the E plane from the slot in the ~ ' dielectric antenna.
Preferred c...l,~- ' of the present invention will be described below with reference to the r-- . ~;.g drawings.
A dielectric antenna shown in Figs. 1-3 includes a first planar conductor (a reverso conductor plate) I and a second planar conductor (an obverse conductor plate) 2. Disposed between the first planar conductor I and the second planar conductor 2 are a dielectric strip 3 and a dielectric resonator 4 spaced from each other along the X axis. Two l~Lm6~ll~ slots 2a and 2b are provided in ~ 2~7705~
parallel and at equal distances from the center line of the dielectric strip 3 within the second planar conductor 2 and above the dielectric resonator 4. The center lines along the length of the slots 2a and 2b are tangent to the outer periphely of the dielectric resonator 4.
An end portion 3a of the dielectric strip 3 is connected to a waveguide and a; ~n circuit (not shown), and the other end portion 3b is an open end. The ~ in which the dielectric strip 3 is ~ d between the first planar conductor I and the second planar conductor 2 ~f an NRD guide.
Next, the operation of this . ' ' will be described.
The ele~ , ' ~ waves i ~ from the ~ , the circuit and the like to the dielectric strip 3 propagate within the dielectric strip 3 in an LSM (~ Section Magnetic) mode which causes an electric field having ~, within the YZ plane and a magnetic field having ~. ~ within the XZ plane. The dielectric strip 3 and the dielectric resonator 4 are el~ , "y coupled, whereby an ~ wave of an IIEI 11 mode having electric-field c r ' in the same direction as that of the LSM mode of the dielectric strip 3 occurs within the dielectric rwonator 4. The el~ c wave is radiated by the dielectric resonator 4 via the slots 2a and 2b.
In this ~.o-l ~ since the two slots 2a and 2b are provided in the second planar conductor 2 in paraUel with the center line of the second planar conductor 2 and in line symmetry with respect to the center line of the dielectric strip 3, the effective opening area of the E plane (the YZ plane in Fig. I) becomw wide, and the radiation angle becomes sharp.
Next, a second ~ b~- " of the present invention will be described with reference to Fig. 4. In this . ' ' t, in addition 30 to the elements included in the first; ',o li~ ,l, a second dielectric ~ 2177050 resonator 4a is disposed between the dielectric strip 3 and the dielectric resonator 4. Since the other . , of this ' - - are the same as those of the first ' - ' t, the ~ , are given the same reference numerals, and a 5 ~ thereof is omitted.
In this . L ' t, since the second dielectric resonator 4a is added, the filtering effect is improved, making it possible to shut out ~ - or to achieve a greater bandwidth in the vicinity of the passband of tne filter.
Next, a third c.l.L~- ' of the present invention will be described with reference to Fig. 5. In this ' ' t, the dielectric antenna of the first . ~~ ' is housed in a housing 6, and a dielectric lens S is disposed above the slots 2a and 2b, thus the directivity and the gain of the radiation cl~ - wave are 15 improved. In tnis ' ' t, based on the equations (I) and (2), the spacing between the slots was adjusted to 0.45 - 0.5 ~ to realize the radiation angle ~(45 - 60) thereby most of the el~ - waves radiated from the slots 2a and 2b are applied onto the dielectric lens 5.
20 Although the above-described respectiw .. Lc ' describe a case in which the slots 2a and 2b are disposed parallel to the center line of the dielectric resonator 4, the slots may not be parallel to the center line of the dielectric strip 3, as illustrated by slots 2c and 2d in Fig. 6A. This is due to the reason that the 25 coupling of the slots and the HEl 11 mode are achieved to a certain degree even in such an ., Such an ~ , of slots may be used if desired for . in ~ 1~ the antennas.
Generally speaking, it is permitted for a plurality of - ~ y parallel slots to be arranged at positions ~ y in ~ ~17705~
point symmetry with respect to the dielectric resonator 4. Fig. 6B
shows a case in which other slots 2e and 2f which are ' '1y parallel to the slots 2a and 2b are disposed to the outside of the slots 2a and 2b. When, as described above, the number of slots is four, S the effective opening area along the E plane becomes wider, and thus the beam width can be made narrower.
Next, a specific example of the present invention will be described. For the sal~e of ~ , l, a prior art case is also shown. The conditions are as shown in the table below.
Table 1 The present invention Prior art Reference fiqure Fiq. 4 Fi~. 7 Number of slots 2 Size of slots Length: 10 mm Same as left Width: O . 4 mm Same as left Diameter of 11.9 mm Same as left radiator The radiation directional pattern along the E plane of the primary radiator measured in the above specific example, is shown in Fig. I l (the present invention) and Fig. 12 (the prior art). It can be, ' ~ from these Figs. I l and 12 that the directivity along 25 the E plane of the present invention having two slots is sharper than that of the prior art having one slot. That is, in Fig. 11 of the present invention, the radiation angle of a 10 dB drop of the main beam in the E plane is i45 f}om the center of the main beam, while in Fig. 12 of the prior art, the radiation angle is ~110.
30 Further, while the antenna efficiency of the example of the present ` 21~70~0 g invention is 44%, the antenna efflciency of the prior art example is 30%. The antenna efficiency of the present invention is improved by ~~ , 10% over that of the prior art. The antenna efficiency is expressed by the ratio of the gain obtained 5 ~ r 'Iy to the dil~Loflal gain calculated ~hpnretirslly from the ~ - ' pattern.
Many different e ': ' of the present imention may be Cu~ Ll ' ~ without departing from the spirit and scope of the present invention. It should be I ' ~ ~ that the present invention 10 is not limited to the specific ~,...I,c ' described in this ~r~rifirq~il To the contrary, the present invention is intended to cover various ~ qtit)n~ and equivalent ~ included within the spirit and scope of the invention as hereafter claimed.
Tne scope of the following claims is to be accorded the broadest 111. SO as to ~ ~ - all such - "~ , equivalent structures and functions.
Claims (11)
1. A dielectric antenna comprising: a nonradiative dielectric guide having a dielectric strip sandwiched between a first planar conductor and a second planar conductor; a dielectric resonator disposed between said first planar conductor and said second planar conductor along an extension line of said dielectric strip; and a plurality of substantially parallel slots disposed symmetrically with respect to said dielectric resonator in the second planar conductor above and in the vicinity of said dielectric resonator.
2. A dielectric antenna according to claim 1, wherein said plurality of substantially parallel slots are disposed in line symmetry with respect to the center line of said dielectric strip.
3. A dielectric antenna according to claim 1, wherein said plurality of substantially parallel slots are disposed in point symmetry with respect to said dielectric resonator.
4. A dielectric antenna according to claim 3, wherein said parallel slots are disposed in parallel with respect to the centre line of the dielectric strip.
5. A dielectric antenna according to claim 3, wherein said parallel slots are disposed at an acute angle with respect to the center line of the dielectric strip.
6. A dielectric antenna according to claim 1, wherein said plurality of substantially parallel slots is a pair of slots.
7. A dielectric antenna according to claim 1, wherein said plurality of substantially parallel slots is four slots, of which two are disposed on each side of said dielectric resonator.
8. A dielectric antenna according to claim 1, further comprising a second dielectric resonator disposed between said first-mentioned dielectric resonator and said dielectric strip along the extension line of the dielectric strip.
9. A dielectric antenna according to claim 1, wherein a dielectric lens is disposed above the slots in said second planar conductor.
10. A dielectric antenna according to claim 2, wherein a dielectric lens is disposed above the slots in said second planar conductor.
11. A dielectric antenna according to claim 3, wherein a dielectric lens is disposed above the slots in said second planar conductor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7-121745 | 1995-05-19 | ||
| JP7121745A JP3042364B2 (en) | 1995-05-19 | 1995-05-19 | Dielectric antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2177050A1 CA2177050A1 (en) | 1996-11-20 |
| CA2177050C true CA2177050C (en) | 1999-08-10 |
Family
ID=14818840
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002177050A Expired - Fee Related CA2177050C (en) | 1995-05-19 | 1996-05-21 | Dielectric antenna |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5883601A (en) |
| EP (1) | EP0743697B1 (en) |
| JP (1) | JP3042364B2 (en) |
| CA (1) | CA2177050C (en) |
| DE (1) | DE69626565T2 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3134781B2 (en) * | 1996-07-19 | 2001-02-13 | 株式会社村田製作所 | Multilayer dielectric line circuit |
| JP3119176B2 (en) * | 1996-10-23 | 2000-12-18 | 株式会社村田製作所 | Antenna shared distributor and transmitter / receiver for dielectric line |
| JP3186622B2 (en) | 1997-01-07 | 2001-07-11 | 株式会社村田製作所 | Antenna device and transmitting / receiving device |
| SE508296C2 (en) * | 1997-01-10 | 1998-09-21 | Ericsson Telefon Ab L M | Device at microstrip distribution network and group antenna |
| WO1998035403A1 (en) * | 1997-02-06 | 1998-08-13 | Robert Bosch Gmbh | Microwave antenna array for a motor vehicle radar system |
| JPH10341108A (en) * | 1997-04-10 | 1998-12-22 | Murata Mfg Co Ltd | Antenna system and radar module |
| JP3120757B2 (en) * | 1997-06-17 | 2000-12-25 | 株式会社村田製作所 | Dielectric line device |
| JP2000134031A (en) * | 1998-10-28 | 2000-05-12 | Murata Mfg Co Ltd | Antenna system, antenna using same and transmitter- receiver |
| CA2292064C (en) | 1998-12-25 | 2003-08-19 | Murata Manufacturing Co., Ltd. | Line transition device between dielectric waveguide and waveguide, and oscillator and transmitter using the same |
| JP3934341B2 (en) | 1999-02-15 | 2007-06-20 | 独立行政法人情報通信研究機構 | Wireless communication device |
| JP3415817B2 (en) * | 2000-08-28 | 2003-06-09 | アーベル・システムズ株式会社 | Solar cell |
| JP3473576B2 (en) * | 2000-12-05 | 2003-12-08 | 株式会社村田製作所 | Antenna device and transmitting / receiving device |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1605231A (en) * | 1967-02-01 | 1985-05-09 | Emi Ltd | Aerial arrays |
| JPS60113502A (en) * | 1983-11-24 | 1985-06-20 | Japan Radio Co Ltd | Slot antenna |
| EP0295003A3 (en) * | 1987-06-09 | 1990-08-29 | THORN EMI plc | Antenna |
| KR920002439B1 (en) * | 1988-08-31 | 1992-03-24 | 삼성전자 주식회사 | Slot antenna device for portable radiophone |
| JPH04266204A (en) * | 1991-02-20 | 1992-09-22 | Fujitsu Ltd | Miniature antenna |
| FR2680283B1 (en) * | 1991-08-07 | 1993-10-01 | Alcatel Espace | MINIATURIZED ELEMENTARY RADIOELECTRIC ANTENNA. |
| FR2705167B1 (en) * | 1993-05-11 | 1995-08-04 | France Telecom | BROADBAND PLATED ANTENNA WITH REDUCED SIZE, AND CORRESPONDING TRANSMIT / RECEIVING DEVICE. |
| JP3128677B2 (en) * | 1993-11-05 | 2001-01-29 | 三井造船株式会社 | Slot antenna with dielectric resonator |
-
1995
- 1995-05-19 JP JP7121745A patent/JP3042364B2/en not_active Expired - Fee Related
-
1996
- 1996-05-13 DE DE69626565T patent/DE69626565T2/en not_active Expired - Fee Related
- 1996-05-13 EP EP96107604A patent/EP0743697B1/en not_active Expired - Lifetime
- 1996-05-21 CA CA002177050A patent/CA2177050C/en not_active Expired - Fee Related
-
1997
- 1997-09-19 US US08/934,120 patent/US5883601A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2177050A1 (en) | 1996-11-20 |
| DE69626565D1 (en) | 2003-04-17 |
| EP0743697B1 (en) | 2003-03-12 |
| DE69626565T2 (en) | 2003-12-11 |
| US5883601A (en) | 1999-03-16 |
| JP3042364B2 (en) | 2000-05-15 |
| JPH08316727A (en) | 1996-11-29 |
| EP0743697A1 (en) | 1996-11-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed | ||
| MKLA | Lapsed |
Effective date: 20100521 |