CN1327231C - Coaxial input adapter for giga hertz transverse electromagnetic wave cell - Google Patents
Coaxial input adapter for giga hertz transverse electromagnetic wave cell Download PDFInfo
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- CN1327231C CN1327231C CNB2005100377672A CN200510037767A CN1327231C CN 1327231 C CN1327231 C CN 1327231C CN B2005100377672 A CNB2005100377672 A CN B2005100377672A CN 200510037767 A CN200510037767 A CN 200510037767A CN 1327231 C CN1327231 C CN 1327231C
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- joint
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Abstract
The present invention relates to a coaxial input joint for a gigahertz transverse electromagnetic wave cell, which can be used for effectively solve the problem of the difficult impedance matching of the gigahertz transverse electromagnetic wave cell within the frequency range of 9kHz to 18 GHz. The coaxial input joint suitable for a GTEM cell for electromagnetic compatibility and relational tests is divided into a joint input section, a joint expansion section and an impedance fine tuning device, wherein an N-shaped joint outer conductor (11) of the joint input section is connected with an integrated joint outer conductor (14), and an N-shaped joint contact pin (12) is connected with an integrated joint inner conductor (15); the small open end of a coaxial horn head (21) at the joint expansion section is transited to an adapter socket (27), and the big open end is connected with a horn transition head (26); one end of an axe-shaped transition block (23) is connected with a big insulation supporter (16), and the other end is connected with a matching transition board (25). The small open end of an outer conductor (4) of the GTEM cell is connected with the big open end of the horn transition head (26), and the impedance fine tuning device is partially positioned at the point of through holes in the wall of the outer conductor (4) of the GTEM cell.
Description
Technical field
The present invention a kind ofly can effectively solve the impedance matching difficult problem of giga hertz transverse electromagnetic wave cell in from 9kHz to the 18GHz frequency range, is applicable to that electromagnetic compatibility and dependence test use the GTEM chamber, belongs to the electromagnetic compatibility test technical field.
Background technology
(gigahertz transverse electromagnetic, GTEM) chamber is based on a kind of field intensity test device of coaxial cable principle to the GHz transverse electromagnetic wave, is actually the coaxial cable of a variable cross section.Its front end is generally standard N type coaxial cable interface, and the inner wire of coaxial cable transition gradually is the central layer of GTEM chamber, and outer conductor transition gradually is the shell of GTEM chamber, and the GTEM chamber is the version of rectangular pyramid body, the tapered expansion in its cross section, and terminal has absorbing material.During low frequency, absorb power input, lean on the absorbing material absorbed power on the end plate during high frequency by coaxial-line termination resistance.Both bring up to more than the 1GHz available work frequency of whole cell in high and low frequency range complementation.This version biggest advantage is to suppress the excitation and the transmission of higher mode, and the space, efficiency test district that is positioned at rear end, GTEM chamber is also bigger.For the frequency of operation upper limit that makes the GTEM chamber reaches 18GHz, must be optimized design to its coaxial input adapter.
Summary of the invention
Technical matters: the objective of the invention is to propose a kind ofly can bear the power input of 1kW, the coaxial input adapter for giga hertz transverse electromagnetic wave cell of covering frequence scope 9kHz～18GHz, can effectively solve the impedance matching difficult problem of GTEM chamber in 9kHz～18GHz frequency range.
Technical scheme: for the frequency of operation upper limit that makes the GTEM chamber reaches 18GHz, the present invention develops the coaxial input adapter that a kind of operating frequency range surpasses 18GHz.Use the measured result of the GTEM chamber voltage standing wave ratio (VSWR) of this joint to be: in 30kHz～18GHz frequency range except that threshold frequency point all less than 1.5: 1, the threshold frequency point is 1.65: 1.In addition, power load-bearing capacity of the present invention can reach 1kW, and is easy to install.
The technical solution adopted in the present invention is: made the input end coaxial cable into be convenient to process round coaxial cable by the rectangular coaxial line structure, reduced the potential link that do not match.The joint input port is a standard N type radio-frequency (RF) coaxial interface, adopts the internal and external conductor of the incorporate conceptual design joint input of N type plug and L27 type socket section.Be to adapt to frequency of operation up to 18GHz, successful design and use axe-shaped piece, built-in curved partially design has been adopted at the axe-shaped piece two ends, makes 6TEM chamber central layer gently carry out the transition to the coaxial cable of symmetry placed in the middle from being partial to top board.Design cut-off waveguide tubular type central layer suspended structure (comprising that the teflon hanger bar is connected with central layer), do not increased the syndeton of the factor that do not match, reduced the reflection of electromagnetic wave of input section.
Its concrete structure is: coaxial input adapter for giga hertz transverse electromagnetic wave cell is divided into joint input section, joint expanding section, three parts of impedance micromatic setting; The N connector outer conductor and the integrated joint outer conductor of its center tap input section join, N connector contact pin and integrated joint inner wire join and prop up chapelet by little insulation and be fixed on junction in N connector outer conductor and the integrated joint outer conductor, and the big openend of integrated joint outer conductor is connected with adapter; The little openend of the coaxial horn head of joint expanding section switches through joint, the big opening termination loudspeaker transition head of coaxial horn head, in the little openend of coaxial horn head, be provided with big insulation and prop up chapelet, axe-shaped piece is positioned at the coaxial horn head, chapelet is propped up in the big insulation of one termination of axe-shaped piece, another termination matching transition plate; The big openend of the little opening termination loudspeaker transition head of the outdoor conductor of GTEM; The through hole that the flange of impedance micromatic setting part is positioned on the outdoor conducting wall of GTEM is connected with cut-off waveguide, block is positioned at the top of cut-off waveguide, the central layer hanger bar is positioned at the central axis place of cut-off waveguide, the central layer setting nut is positioned at the top of central layer hanger bar, and the bottom of central layer hanger bar is connected with central layer by the Pear-Shaped hole on the central layer; Axe-shaped piece is connected with screw by the positioning spiro pit on the axe-shaped piece with a big insulation chapelet; Axe-shaped piece is connected with central layer by the oval hole on the central layer; Matching transition plate behind the axe-shaped piece is connected with central layer by the oval hole on the central layer equally.
Beneficial effect:
The operating frequency range of 1 this input adapter can reach 18GHz, can effectively solve the impedance matching difficult problem of GTEM chamber in 9kHz～18GHz frequency range;
2 this input adapters success design and use axe-shaped piece, make GTEM chamber central layer gently carry out the transition to the coaxial cable of symmetry placed in the middle from the deflection top board;
The inner wire structural entityization of 3 these input adapters, the discontinuous link of minimizing plug inner structure;
4 utilize cut-off waveguide tubular type central layer suspended structure to carry out the impedance fine setting, have increased a GTEM chamber coupling and have adjusted link.
Description of drawings
Fig. 1 is the axial sectional structure synoptic diagram along the GTEM joint.
Fig. 2 is on the basis of Fig. 1, with the GTEM joint be rotating shaft axially, revolve the sectional structure synoptic diagram that turn 90 degrees.
Have among Fig. 1: chapelet 13, integrated joint outer conductor 14, integrated joint inner wire 15, a big insulation chapelet 16 are propped up in N connector outer conductor 11, N connector contact pin 12, the little insulation of joint input section; The coaxial horn head 21 of joint expanding section, positioning spiro pit 22, axe-shaped piece 23, link slot 24, matching transition plate 25, loudspeaker transition head 26, transition adapter 27; The block 31 of impedance micromatic setting, central layer setting nut 32, cut-off waveguide 33, flange 34, central layer hanger bar 35; The outdoor conductor 4 of GTEM; Central layer 5: Pear-Shaped central layer suppending hole 51.
Embodiment
This input adapter is divided into input section, expanding section and cut-off wave conduction impedance fine tuning structure three parts.Input adapter section and expanding section are realized the switch transition from the circular input socket of N type coaxial cable to the flat central layer of gtem cell, and carry out the transition to 3: 1 eccentric structure of gtem cell by the symmetrical structure of circular coaxial line.Cut-off wave conduction impedance fine tuning structure is realized the impedance fine setting to the GTEM chamber.
In order to realize the frequency of operation upper limit of 18GHz, adopt N type plug and the incorporate design proposal of L27 socket, inner wire is also adopted incorporate form.And carried out following optimal design:
(1) optimization of medium pad place structure
Consider from structure, must support the location with medium block (generally using teflon) between the internal and external conductor.In order to satisfy the requirement of structure upper support location, guarantee that again characteristic impedance is constant, reduce the negative effect that the sudden change of inner wire size brings, therefore the appropriate position punching of propping up chapelet at teflon guarantees that characteristic impedance is 50 Ω.
(2) justify the optimization of structure to square structure transition section structure
In gtem cell, the round coaxial configuration of joint front end must be carried out the transition to the rectangular coaxial structure of rear end, stagger in the internal and external conductor cascaded surface position of this input adapter, the inductance that ladder electric capacity that uncontinuity produces has been increased compensates, and finally guarantees in the impedance at this place constant.
(3) design of axe shape piece
Axe shape piece input end is the square sectional that removes the 10mm * 10mm of corner angle, output terminal be 62mm wide * 5mm thick (the central layer inserting slot that contains 3mm), and between 10mm * 10mm square sectional Duan Yuyuan coaxial inner conductor, also have one section transition cushion block, during actual the debugging, adjust the coupling of horn jonit place ladder transition section by this transition cushion block.
In order to realize gradual change, the central layer and the angle between the coaxial socket axis of GTEM chamber is dispersed in axe shape piece input end and middle part thereof.Adopt the wedge shape transition to be connected between axe shape piece and the central layer, because axe shape piece top is from the top board close together, the sudden change of central layer size is obvious to the characteristic impedance influence, so added a trapezoidal matching transition plate again on central layer.Have oval at the attachment screw position on the central layer and adjust the hole, the cumulative errors when assembling to compensate whole gtem cell are controlled in the 0.2mm the uncertain amount of spacing between axe shape piece end and the head of the trumpet outer conductor.
Have among the present invention: the N connector outer conductor 11 of joint input section, N connector contact pin 12, chapelet 13 is propped up in the little insulation of teflon, the integrated joint outer conductor 14 of N-L27, the integrated joint inner wire 15 of N-L27, chapelet 16 is propped up in the big insulation of teflon.The changeable type transition adapter 27 of joint expanding section (with 21 welding of coaxial horn head), the integrated joint inner wire of N-L27 installing and locating threaded hole 22, axe-shaped piece 23, axe shape piece and central layer link slot 24, matching transition plate 25, fixed loudspeaker transition head 26.The block 31 of cut-off wave conduction impedance fine tuning structure, central layer setting nut 32, cut-off waveguide 33, mounting flange 34; Teflon central layer hanger bar 35.The outdoor conductor 4 of GTEM.Central layer 5: Pear-Shaped central layer suppending hole 51.
The integrated joint outer conductor 14 of N connector outer conductor 11 and N-L27 is by being threaded, and the integrated joint inner wire 15 of N connector contact pin 12 and N-L27 adopts and is threaded, and utilizes the little insulation of teflon to prop up chapelet 13 to position.The integrated joint outer conductor 14 of N-L27 of joint input section and the transition adapter 27 of joint expanding section are connected by 4 screws, the integrated joint inner wire 15 of N-L27 is connected by screw thread 22 with axe-shaped piece 23, and utilizes the big insulation of teflon to prop up chapelet 16 location.Changeable type coaxial horn head 21 and fixed loudspeaker transition head 26 are connected by screw, and axe-shaped piece 23 links to each other by link slot 24 with central layer 5, and adopts screw retention.The outdoor conductor 4 of fixed loudspeaker transition head 26 and GTEM passes through screw retention.The block 31 with cut-off waveguide 33 by being threaded, central layer setting nut 32 is realized adjusting to the central layer height by thread bush on teflon central layer hanger bar 35 tops, cut-off waveguide 33 is connected with mounting flange 34 by screw thread, on the outdoor conductor of GTEM 4, teflon central layer hanger bar 35 is connected with central layer 5 by Pear-Shaped hole 51 mounting flange 34 by screw retention.
Concrete structure is: the N connector outer conductor 11 of its center tap input section joins with integrated joint outer conductor 14, N connector contact pin 12 joins with integrated joint inner wire 15 and props up chapelet 13 by little insulation and is fixed on junction in N connector outer conductor 11 and the integrated joint outer conductor 14, and the big openend of integrated joint outer conductor 14 is connected with transition adapter 27; The little openend of the coaxial horn head 21 of joint expanding section and 27 welding of transition adapter, the big opening termination loudspeaker transition head 26 of coaxial horn head 21, be provided with big insulation in the inner port of transition adapter 27 and prop up chapelet 16, axe-shaped piece 23 is positioned at coaxial horn head 21, an one termination inner wire 15 of axe-shaped piece 23 and a big insulation chapelet 16, other end core receiving plate 5 and matching transition plate 25; The big openend of the little opening termination loudspeaker transition head 26 of the outdoor conductor 4 of GTEM, the through hole that the flange 34 of impedance micromatic setting part is positioned on outdoor conductor 4 walls of GTEM is connected with cut-off waveguide 33, block 31 is positioned at the top of cut-off waveguide 33, central layer hanger bar 35 is positioned at the central axis place of cut-off waveguide 33, central layer setting nut 32 is positioned at the top of central layer hanger bar 35, and the bottom of central layer hanger bar 35 is connected with central layer 5 in the outdoor conductor 4 of GTEM.Axe-shaped piece 23 is connected by the 22 usefulness screws of the positioning spiro pit on the axe-shaped piece 3 with a big insulation chapelet 16; Axe-shaped piece 23 is connected with screw by the link slot on the axe-shaped piece 23 with central layer 5; Matching transition plate 25 is connected with central layer by the oval hole on the central layer 5.
Claims (3)
1, a kind of coaxial input adapter for giga hertz transverse electromagnetic wave cell is characterized in that this input adapter is divided into joint input section, joint expanding section, three parts of impedance micromatic setting; The N connector outer conductor (11) of its center tap input section joins with integrated joint outer conductor (14), N connector contact pin (12) joins with integrated joint inner wire (15) and props up chapelet (13) by little insulation and is fixed on N connector outer conductor (11) and the interior junction of integrated joint outer conductor (14), and the big openend of integrated joint outer conductor (14) is connected with transition adapter 27; The little opening of the coaxial horn head (21) of joint expanding section is connected with transition adapter 27, the big opening termination loudspeaker transition heads (26) of coaxial horn head (21); Be provided with big insulation in the inner port of transition adapter (27) and prop up chapelet (16), axe-shaped piece (23) is positioned at coaxial horn head (21), an one termination inner wire (15) of axe-shaped piece (23) and a big insulation chapelet (16), other end core receiving plate 5 and matching transition plate (25); The big openend of the little opening termination loudspeaker transition heads (26) of the outdoor conductor of GTEM (4); The through hole that the flange (34) of impedance micromatic setting part is positioned on the outdoor conductor of GTEM (4) wall is connected with cut-off waveguide (33), block (31) is positioned at the top of cut-off waveguide (33), central layer hanger bar (35) is positioned at the central axis place of cut-off waveguide (33), central layer setting nut (32) is positioned at the top of central layer hanger bar (35), and the bottom of central layer hanger bar (35) is connected with central layer (5) in the outdoor conductor of GHz transverse electromagnetic wave GTEM (4).
2, coaxial input adapter for giga hertz transverse electromagnetic wave cell according to claim 1 is characterized in that axe-shaped piece (23) is connected with screw by the positioning spiro pit (22) on the axe-shaped piece (23) with a big insulation chapelet (16); Axe-shaped piece (23) is connected with central layer by link slot (24) on the axe-shaped piece (23) and the oval hole on the central layer; Matching transition plate (25) is connected with central layer by the oval hole on the central layer.
3, coaxial input adapter for giga hertz transverse electromagnetic wave cell according to claim 1 is characterized in that central layer hanger bar (35) is connected by Pear-Shaped central layer suppending hole (51) with central layer (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100377672A CN1327231C (en) | 2005-02-04 | 2005-02-04 | Coaxial input adapter for giga hertz transverse electromagnetic wave cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100377672A CN1327231C (en) | 2005-02-04 | 2005-02-04 | Coaxial input adapter for giga hertz transverse electromagnetic wave cell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1667422A CN1667422A (en) | 2005-09-14 |
| CN1327231C true CN1327231C (en) | 2007-07-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100377672A Expired - Fee Related CN1327231C (en) | 2005-02-04 | 2005-02-04 | Coaxial input adapter for giga hertz transverse electromagnetic wave cell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1327231C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101881788B (en) * | 2010-06-10 | 2012-07-04 | 郑州大学 | Test turntable for transverse electromagnetic wave transmission cell and test method thereof |
| CN105406244B (en) * | 2015-10-29 | 2018-01-12 | 中国舰船研究设计中心 | A kind of GHz cross electromagnetic wave small room cable connector and design method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4983910A (en) * | 1988-05-20 | 1991-01-08 | Stanford University | Millimeter-wave active probe |
| CN2115541U (en) * | 1992-01-20 | 1992-09-09 | 东南大学 | Wavelength instrument with circular fluted guide |
| US6289290B1 (en) * | 1997-12-26 | 2001-09-11 | Electronics And Telecommunications Research Institute | Method for estimating radiated emission level from an EUT at an arbitrary position on the turn table at OATS |
| CN2771871Y (en) * | 2005-02-04 | 2006-04-12 | 东南大学 | Coaxial joint for impedance matching |
-
2005
- 2005-02-04 CN CNB2005100377672A patent/CN1327231C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4983910A (en) * | 1988-05-20 | 1991-01-08 | Stanford University | Millimeter-wave active probe |
| CN2115541U (en) * | 1992-01-20 | 1992-09-09 | 东南大学 | Wavelength instrument with circular fluted guide |
| US6289290B1 (en) * | 1997-12-26 | 2001-09-11 | Electronics And Telecommunications Research Institute | Method for estimating radiated emission level from an EUT at an arbitrary position on the turn table at OATS |
| CN2771871Y (en) * | 2005-02-04 | 2006-04-12 | 东南大学 | Coaxial joint for impedance matching |
Non-Patent Citations (3)
| Title |
|---|
| GTEM室与开阔场的辐射发射相关研究 任列辉 陈志雨，电波科学学报，第Vol.17卷第1期 2002 * |
| GTEM室与开阔场的辐射发射相关研究 任列辉 陈志雨，电波科学学报，第Vol.17卷第1期 2002;吉赫横电磁波室的结构设计 蒋全兴 吕仁清，东南大学学报，第Vol.23 Suppl.卷第Nov.1993期 1993 * |
| 吉赫横电磁波室的结构设计 蒋全兴 吕仁清，东南大学学报，第Vol.23 Suppl.卷第Nov.1993期 1993 * |
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| CN1667422A (en) | 2005-09-14 |
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Granted publication date: 20070718 Termination date: 20190204 |