CN201060919Y - Arbitrarily dual-frequency band 3dB branch directional coupler - Google Patents
Arbitrarily dual-frequency band 3dB branch directional coupler Download PDFInfo
- Publication number
- CN201060919Y CN201060919Y CNU2007200385758U CN200720038575U CN201060919Y CN 201060919 Y CN201060919 Y CN 201060919Y CN U2007200385758 U CNU2007200385758 U CN U2007200385758U CN 200720038575 U CN200720038575 U CN 200720038575U CN 201060919 Y CN201060919 Y CN 201060919Y
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- Prior art keywords
- branch line
- branch
- directional coupler
- frequency band
- dual
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Abstract
The utility model relates to a 3 dB branch directional coupler applicable for random dual frequency bands, in particular to a microstrip branch directional coupler, comprising a first branch line (1) and a second branch line (2), and a third branch line (3) and a fourth branch line (4) both arranged between the first branch line (1) and the second branch line (2). The utility model is characterized in that: the four branch line are all in the shape of a rectangle, and a first input port (10) and a second input port (11) are respectively arranged at both ends of the first branch line (1); a first output port (12) and a second output port (13) are respectively arranged at two ends of the second branch line (2). A plurality of distributed inductors (5) are respectively arranged inside the four branch lines, a metalized through hole (51) is arranged at the end part of each distributed inductor (5) and connected on a lower metal plate (8). The utility model has the advantages of simple structure, small loss, convenience for processing, low cost, and applicability to any dual frequency band.
Description
Technical field
The utility model relates to a kind of microstrip line branch directional coupler, relates in particular to a kind of any dual-frequency band 3dB branch directional coupler.
Background technology
Its branch line electric bridge of microstrip line branch directional coupler commonly used at present is made up of two ribbon feeders, realizes coupling by branch line, all is 1/4th operation wavelengths in the length of centre frequency top set line and interval therebetween.Because the linear phase-frequency response characteristic of branch line, such directional coupler can only be operated in design frequency f
0With its odd frequency multiplication such as 3f
0, 5f
0... on.And in two-band or multiband communication system, the selection of each band frequency is independently, is not the relation of odd frequency multiplication generally, so traditional branch directional coupler can not directly satisfy the logical frequency range requirement of these systems.
In April, 2004, the T.Itoh professor of Univ California-Los Angeles USA has reported any dual-frequency directional coupler that utilizes left-right-hand composite transmission line to realize on the 52nd phase of IEEE TransactionsMicrowave Theory Techniques.On each microstrip branch line of this coupler, all loaded the series capacitance and the shunt inductance of lump, thereby realized nonlinear phase frequency response, and then the directional coupler that centre frequency is respectively 930MHz and 1780MHz has been finished in design.Yet, because the bigger further research and extension that has limited this type of directional coupler of parameter such as the finiteness of the discrete choosing value of lamped element and parasitic drains.In addition, the left-right-hand composite transmission line based on complete little band distributed frame also should not directly apply in the design of directional coupler because complex structure is difficult to precise design.
Summary of the invention
Technical problem: goal of the invention of the present utility model provides a kind of any dual-frequency band 3dB branch directional coupler, this any dual-frequency band 3dB branch directional coupler can work in any dual-frequency band, simple in structure, loss is little, be convenient to processing and cost low.
Technical scheme: any dual-frequency band 3dB branch directional coupler of the present utility model, comprise first branch line and second branch line, between first branch line and second branch line, be provided with the 3rd branch line and the 4th branch line, and above-mentioned four branch lines form rectangle, and be respectively equipped with the first input end mouth and second input port at the two ends of first branch line, be respectively equipped with first output port and second output port at the two ends of second branch line, at above-mentioned first branch line, second branch line, the inboard of the 3rd branch line and the 4th branch line is respectively equipped with distributed inductance, end at distributed inductance is provided with plated-through hole, and plated-through hole is connected down on the metallic plate.
Distributed inductance is located at the middle part of first branch line, second branch line, the 3rd branch line and the 4th branch line respectively.
The outside at described first branch line, second branch line, the 3rd branch line and the 4th branch line is respectively equipped with metal patch, and each metal patch and corresponding distributed inductance are symmetrically distributed in the both sides of every branch line.
Distributed inductance linearly or curve.
Beneficial effect: compared with prior art, the utlity model has following advantage:
1, the utility model can be operated in any dual-frequency band.Four branch lines of the present utility model have formed four reduced form left-right-hand composite transmission lines together with the distributed inductance of inboard, this distributed frame has taken into full account the equivalent electric circuit dispersion characteristics of microstrip line with frequency, and this just makes this type of novel coupler can work in any microwave frequency band.Because the effect of the inboard distributed inductance that connects, make this type of reduced form left-right-hand composite transmission line keep the part nonlinear phase-frequency response characteristic of traditional left-right-hand composite transmission line, and then make the utility model can work on the double frequency-band of any needs.
2, the utility model is simple in structure, and it is low to be convenient to processing and cost.With respect to lumped-circuit of the prior art, employing distributed inductance of the present utility model and then formed discrete circuitry, like this, just make that the utility model is simple in structure, the utility model adopts single-layer printed circuit plate (PCB) explained hereafter, one-shot forming need not external any lamped element, thereby is convenient to processing, has reduced production cost.
3, the utility model loss is little and be convenient to regulate.Because the utility model adopts distributed microstrip structure, this has just reduced because use the influence such as welding loss, lamped element parameter error dispersion etc. that lamped element brought, make the loss of the utility model when work reduce, simultaneously owing to distributed inductance is located at the middle part of branch line, and be provided with metal patch in the outside of branch line, can regulate the performance of operating frequency passband of the present utility model easily.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Fig. 2 is a S parameter amplitude simulation result of the present utility model.
Fig. 3 is a S parameter amplitude experimental measurements of the present utility model.
Fig. 4 is the phase difference emulation and the measurement result of first output port of the present utility model and second output port.
Have among the above figure: first branch line 1, second branch line 2, the 3rd branch line 3, the 4th branch line 4, distributed inductance 5, plated-through hole 51, following metallic plate 8, metal patch 9, first input end mouth 10, second input port 11, first output port 12, second output port 13.
Embodiment
A kind of any dual-frequency band 3dB branch directional coupler, comprise first branch line 1 and second branch line 2, between first branch line 1 and second branch line 2, be provided with the 3rd branch line 3 and the 4th branch line 4, and above-mentioned four branch lines form rectangle, and be respectively equipped with the first input end mouth 10 and second input port 11 at the two ends of first branch line 1, be respectively equipped with first output port 12 and second output port 13 at the two ends of second branch line 2, at above-mentioned first branch line 1, second branch line 2, the inboard of the 3rd branch line 3 and the 4th branch line 4 is respectively equipped with distributed inductance 5, be provided with plated-through hole 51 in the end of distributed inductance 5, plated-through hole 51 is connected down on the metallic plate 8, and distributed inductance 5 is located at first branch line 1 respectively, second branch line 2, the middle part of the 3rd branch line 3 and the 4th branch line 4.
The outside at described first branch line 1, second branch line 2, the 3rd branch line 3 and the 4th branch line 4 is respectively equipped with metal patch 9, by changing the length of metal patch 9, just can realize fine setting like this to operating frequency passband performance of the present utility model.
Described distributed inductance 5 can be straight line or curve, when being designed to curve, just further dwindles inner structure size of the present utility model.
Fig. 2 and Fig. 3 have provided S parameter amplitude of the present utility model (dB) emulation and measurement result relatively, and we are respectively the 3dB constant power output (S that 900MHz and 1800MHz have realized first port one 2 and second port one 3 in centre frequency as can be seen from two figure
21≈ S
31≈ 3dB), on this two centre frequency, the reflection coefficient (S of first input end mouth 10
11) less than-21dB, the isolating coefficient (S of first input end mouth 10 to second input ports 11
41) greater than 25dB, promptly realized well low reflection and high isolation performance.Fig. 4 is the phase difference of first output port and second output port, and we are respectively on 900MHz and the 1800MHz in centre frequency as can be seen from figure, and two output port phase differences are 90 degree ± 1.8 degree, have promptly realized good signal in orthogonal output characteristic.
Claims (4)
1. any dual-frequency band 3dB branch directional coupler, comprise first branch line (1) and second branch line (2), between first branch line (1) and second branch line (2), be provided with the 3rd branch line (3) and the 4th branch line (4), and above-mentioned four branch lines form rectangle, and be respectively equipped with first input end mouth (10) and second input port (11) at the two ends of first branch line (1), be respectively equipped with first output port (12) and second output port (13) at the two ends of second branch line (2), it is characterized in that at above-mentioned first branch line (1), second branch line (2), the inboard of the 3rd branch line (3) and the 4th branch line (4) is respectively equipped with distributed inductance (5), be provided with plated-through hole (51) in the end of distributed inductance (5), plated-through hole (51) is connected down on the metallic plate (8).
2. any dual-frequency band 3dB branch directional coupler according to claim 1 is characterized in that described distributed inductance (5) is located at the middle part of first branch line (1), second branch line (2), the 3rd branch line (3) and the 4th branch line (4) respectively.
3. any dual-frequency band 3dB branch directional coupler according to claim 1, it is characterized in that being respectively equipped with metal patch (9), and each metal patch (9) and corresponding distributed inductance (5) are symmetrically distributed in the both sides of every branch line in the outside of described first branch line (1), second branch line (2), the 3rd branch line (3) and the 4th branch line (4).
4. according to claim 1 or 2 or 3 described any dual-frequency band 3dB branch directional couplers, it is characterized in that described distributed inductance (5) linearly or curve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200385758U CN201060919Y (en) | 2007-07-13 | 2007-07-13 | Arbitrarily dual-frequency band 3dB branch directional coupler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200385758U CN201060919Y (en) | 2007-07-13 | 2007-07-13 | Arbitrarily dual-frequency band 3dB branch directional coupler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201060919Y true CN201060919Y (en) | 2008-05-14 |
Family
ID=39409409
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200385758U Expired - Lifetime CN201060919Y (en) | 2007-07-13 | 2007-07-13 | Arbitrarily dual-frequency band 3dB branch directional coupler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201060919Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103414023A (en) * | 2013-07-22 | 2013-11-27 | 西安空间无线电技术研究所 | Small input Butler matrix with high tolerance |
| CN104733839A (en) * | 2013-12-18 | 2015-06-24 | 宏碁股份有限公司 | Communication device |
| CN106129571A (en) * | 2016-08-25 | 2016-11-16 | 电子科技大学 | A kind of double frequency branch line coupler |
| CN107240752A (en) * | 2017-07-02 | 2017-10-10 | 中国航空工业集团公司雷华电子技术研究所 | A kind of minimized wide-band branch-line coupler based on paster loading technique |
-
2007
- 2007-07-13 CN CNU2007200385758U patent/CN201060919Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103414023A (en) * | 2013-07-22 | 2013-11-27 | 西安空间无线电技术研究所 | Small input Butler matrix with high tolerance |
| CN104733839A (en) * | 2013-12-18 | 2015-06-24 | 宏碁股份有限公司 | Communication device |
| CN106129571A (en) * | 2016-08-25 | 2016-11-16 | 电子科技大学 | A kind of double frequency branch line coupler |
| CN106129571B (en) * | 2016-08-25 | 2020-01-10 | 电子科技大学 | Double-frequency branch line coupler |
| CN107240752A (en) * | 2017-07-02 | 2017-10-10 | 中国航空工业集团公司雷华电子技术研究所 | A kind of minimized wide-band branch-line coupler based on paster loading technique |
| CN107240752B (en) * | 2017-07-02 | 2020-07-03 | 中国航空工业集团公司雷华电子技术研究所 | Miniaturized broadband branch line coupler based on patch loading technology |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20070713 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |