CN104009274A - Microwave matching technology between coaxial transmission lines and multi-branch strip transmission lines - Google Patents
Microwave matching technology between coaxial transmission lines and multi-branch strip transmission lines Download PDFInfo
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- CN104009274A CN104009274A CN201410211760.7A CN201410211760A CN104009274A CN 104009274 A CN104009274 A CN 104009274A CN 201410211760 A CN201410211760 A CN 201410211760A CN 104009274 A CN104009274 A CN 104009274A
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- transmission lines
- transmission line
- coaxial
- strip transmission
- microwave
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Abstract
The invention provides a microwave matching technology between coaxial transmission lines and multi-branch strip transmission lines, and the method is used for achieving good microwave matching between the coaxial transmission lines and the multi-branch strip transmission lines and solving the problem of poor matching in the prior art. The multi-branch strip transmission lines are symmetrically distributed in a radial mode, a coaxial connector is located at the center and perpendicularly connected with the strip transmission line, and an inner conductor of the coaxial connector can be in direct lap joint with a plurality of strip central conductors. On the basis, the method adopts the following compensation structure that matching steps are added at the end face of the inner conductor of the coaxial connector, the walls of outer conductors of the strip transmission lines are crossed and then extend to the center until the inner wall of an outer conductor of the coaxial connector to form a plurality of thin-walled structures, and the multi-branch strip transmission lines are completely separated; upward-convex bosses are added at the bottoms of outer opposite conductors of the strip transmission lines and the coaxial transmission lines. The three microwave compensation structures can substantially improve microwave matching between the coaxial transmission lines and the strip transmission lines. When the work frequency is in a millimeter wave frequency band, return loss can be reduced lower than -30 dB, and the requirement for high-precision microwave signal transmission is met.
Description
Technical field
The present invention relates to a kind of microwave switch, particularly a kind of coaxial transmission line is to the microwave matching technology of multiple strip transmission line branch.
Background technology
Existing radio frequency mechanical switch is as the radio frequency path switching device of microwave communication and Auto-Test System, for realizing the controlled switching of test and communication port, this class mechanical switch adopts coaxial connector as input/output port conventionally, its inner switching that adopts strip line to realize different path microwave signals, complete microwave signal transmission channel is coaxial transmission line-strip transmission line-coaxial transmission line.Due to coaxial transmission line and strip transmission line physical structure difference huge, the structural mutation of two types of transmission lines conversion junctions will cause serious Microwave Impedance mismatch.And microwave transmission path need to be through the conversion of twice transmission line type, the deterioration of its transmission characteristic will be more serious, therefore conventionally will take certain microwave indemnifying measure (impedance match technique) to improve the impedance mismatching at this place.Therefore the impedance matching mode of two types of transmission line conversion junctions has determined the microwave property of mechanical switch substantially.In addition generally to realize for radio-frequency (RF) switch the switching requirement that single-pole double throw or six is thrown, therefore input/output port conventionally will with two-way Dao Liu road multiple branch strip transmission line matching connection.With respect to the impedance matching of single transmission channel, the difficulty of matching of multiple-limb strip transmission line and coaxial transmission line significantly increases.
Existing coaxial transmission line to multiple-limb strip transmission line microwave matching technical scheme is: multiple-limb strip transmission line is radial symmetrical, coaxial connector is positioned at center and is connected with strip transmission line is vertical, and internal conductor of coaxial connector can directly overlap with many banded center conductors simultaneously; Multiple strip transmission line outer conductor walls intersect naturally in center.Although this connector mode can realize the transmission of high-frequency signal, but microwave matching characteristic is not good, reflection loss is larger, and along with the rising of frequency, microwave matching characteristic sharply worsens, and cannot work to millimeter wave frequency band, can only be used for the low accuracy test system of the following wave band of 18GHz, for requiring low reflection, high-precision millimeter wave test macro, existing transmission line match pattern cannot meet the demands.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, provide a kind of coaxial transmission line to multiple-limb strip transmission line microwave matching technology, realize the matched well of coaxial transmission line to multiple strip transmission line branch, solved the bad problem of current coupling.
Technical scheme of the present invention is: multiple-limb strip transmission line adopts radial symmetrical, and coaxial connector is positioned at center and strip transmission line vertical interconnect, and internal conductor of coaxial connector can directly overlap with many banded center conductors simultaneously.This basis is upper again, has adopted following collocation structure: increase coupling step in internal conductor of coaxial connector end 1.; 2. the crossing backward center of strip transmission line outer conductor wall extends to coaxial connector outer conductor inwall, forms multiple thin-wall constructions, and multiple-limb strip transmission line is separated completely; 3. increase the boss to upper process at strip transmission line to the relative outer conductor bottom of coaxial transmission line.This three places microwave collocation structure makes coaxial transmission line significantly improve to the microwave matching of strip transmission line.When operating frequency is during at millimeter wave frequency band, clawback loss can be down to-below 30dB, reach High-precision Microwave request signal transmission.
The present invention's technique effect is compared with prior art:
(1) existing coaxial transmission line is that physical dimension is seriously suddenlyd change to the major defect of multiple-limb strip transmission line microwave matching technical scheme, and microwave discontinuity is large, and impedance mismatching is serious, causes switch module port standing wave poor, affects test macro performance.
(2) the present invention compared with prior art can significantly improve the microwave matching characteristic of coaxial transmission line to multiple-limb strip transmission line.
Key point of the present invention and protection point are: (1) internal conductor of coaxial connector end face design compensation boss; (2) the crossing backward center of strip transmission line outer conductor wall extends to form thin-walled; (3) increase boss in strip transmission line outer conductor bottom near coaxial connector outer conductor place.
Brief description of the drawings
Fig. 1 is fundamental diagram of the present invention;
Fig. 2 is plane graph of the present invention;
Fig. 3 is internal conductor of coaxial connector plane graph of the present invention;
Fig. 4 is prior art fundamental diagram.
Embodiment
As shown in Figure 1, 2, 3, the invention provides a kind of coaxial transmission line to multiple-limb strip transmission line microwave matching technology, be mainly reflected in 1 inner wire, 2 thin-walleds, 3 outer conductors.
As shown in Figure 1,1 increases coupling step in internal conductor of coaxial connector end; 2 strip transmission line outer conductor walls intersect backward center and extend to coaxial connector outer conductor inwall, form multiple thin-wall constructions, and multiple-limb strip transmission line is separated completely; 3 increase the boss to upper process at strip transmission line to the relative outer conductor bottom of coaxial transmission line.
The content not being described in detail in specification of the present invention belongs to those skilled in the art's known technology.
Claims (3)
1. coaxial transmission line is to multiple-limb strip transmission line microwave matching technology, for realizing the good microwave matching of coaxial transmission line to multiple strip transmission line branch, solve the bad problem of coupling at present, it is characterized in that: internal conductor of coaxial connector end face design compensation boss.
2. coaxial transmission line according to claim 1, to multiple-limb strip transmission line microwave matching technology, is characterized in that: strip transmission line outer conductor wall intersects backward center and extends to form thin-walled.
3. coaxial transmission line according to claim 1, to multiple-limb strip transmission line microwave matching technology, is characterized in that: increase boss in strip transmission line outer conductor bottom near coaxial connector outer conductor place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410211760.7A CN104009274A (en) | 2014-05-20 | 2014-05-20 | Microwave matching technology between coaxial transmission lines and multi-branch strip transmission lines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410211760.7A CN104009274A (en) | 2014-05-20 | 2014-05-20 | Microwave matching technology between coaxial transmission lines and multi-branch strip transmission lines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104009274A true CN104009274A (en) | 2014-08-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410211760.7A Pending CN104009274A (en) | 2014-05-20 | 2014-05-20 | Microwave matching technology between coaxial transmission lines and multi-branch strip transmission lines |
Country Status (1)
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| CN (1) | CN104009274A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2749524A (en) * | 1952-04-01 | 1956-06-05 | Itt | Switching devices |
| US2926318A (en) * | 1956-06-26 | 1960-02-23 | Electronic Specialty Co | Miniature co-axial switch |
| US3750053A (en) * | 1972-04-24 | 1973-07-31 | Plessey Inc | Coaxial transmission line rf switch |
| US4298847A (en) * | 1980-04-21 | 1981-11-03 | Dynatech - Uz, Inc. | Multiposition microwave switch with independent termination |
| CN101227017A (en) * | 2007-01-17 | 2008-07-23 | 安捷伦科技有限公司 | Radio frequency assembly and a multiport switch having the same |
| CN102544645A (en) * | 2011-12-29 | 2012-07-04 | 航天时代电子技术股份有限公司 | Modularized T-type microwave switch |
-
2014
- 2014-05-20 CN CN201410211760.7A patent/CN104009274A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2749524A (en) * | 1952-04-01 | 1956-06-05 | Itt | Switching devices |
| US2926318A (en) * | 1956-06-26 | 1960-02-23 | Electronic Specialty Co | Miniature co-axial switch |
| US3750053A (en) * | 1972-04-24 | 1973-07-31 | Plessey Inc | Coaxial transmission line rf switch |
| US4298847A (en) * | 1980-04-21 | 1981-11-03 | Dynatech - Uz, Inc. | Multiposition microwave switch with independent termination |
| CN101227017A (en) * | 2007-01-17 | 2008-07-23 | 安捷伦科技有限公司 | Radio frequency assembly and a multiport switch having the same |
| CN102544645A (en) * | 2011-12-29 | 2012-07-04 | 航天时代电子技术股份有限公司 | Modularized T-type microwave switch |
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Addressee: Beijing Leaguesun Electronics Co., Ltd. Document name: Notification of Passing Examination on Formalities |
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Addressee: Beijing Leaguesun Electronics Co., Ltd. Document name: Notification of Patent Invention Entering into Substantive Examination Stage |
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Address after: 101102, Beijing, Zhongguancun science and Technology Park, Tongzhou Park, Jinqiao technology industry base, 15 South four street, 18H, Tongzhou District Applicant after: BEIJING LEAGUESUN ELECTRONIC CO., LTD. Address before: 101102, Beijing, Zhongguancun science and Technology Park, Tongzhou Park, Jinqiao technology industry base, 15 South four street, 18H, Tongzhou District Applicant before: Beijing Leaguesun Electronics Co., Ltd. |
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Addressee: BEIJING LEAGUESUN ELECTRONIC CO., LTD. Document name: Notification of Passing Examination on Formalities |
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| DD01 | Delivery of document by public notice |
Addressee: Zhang Jie Document name: Notification of Passing Examination on Formalities |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140827 |