CN204706621U - Mini Microstrip coupler - Google Patents
Mini Microstrip coupler Download PDFInfo
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- CN204706621U CN204706621U CN201520498198.0U CN201520498198U CN204706621U CN 204706621 U CN204706621 U CN 204706621U CN 201520498198 U CN201520498198 U CN 201520498198U CN 204706621 U CN204706621 U CN 204706621U
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Abstract
The utility model Mini Microstrip coupler, comprise axis the first coupling branch line parallel to each other and the second coupling branch line, the left end of the first coupling branch line is connected with first interface by first micro-band branch line, the right-hand member of the first coupling branch line is connected with the second interface by second micro-band branch line, the left end of the second coupling branch line is connected with the 3rd interface by the 3rd micro-band branch line, the right-hand member of the second coupling branch line is connected with the 4th interface by the 4th micro-band branch line, first micro-band branch line connects micro-band by first and is connected with the 3rd micro-band branch line, second micro-band branch line connects micro-band by second and is connected with the 4th micro-band branch line, first connects micro-band is connected with the first crack branch line towards the side that second connects micro-band, second connects micro-band is connected with the second crack branch line towards the side that first connects micro-band, first coupling branch line is connected with cross microstrip line A towards the side of the second coupling branch line, second coupling branch line is connected with cross microstrip line B towards the side of the first coupling branch line.
Description
Technical field
The utility model relates to coupler, specifically Mini Microstrip coupler.
Background technology
Considerablely to develop fast along with the communication technology achieves, microwave telecommunication devices also grow up thereupon.Nowadays communication equipment is tending towards miniaturized, portability, and this reduces the higher requirement of proposition to the size of passive device in communication equipment.
Directional coupler has simple structure and good directivity, obtains and apply comparatively widely in microwave communication.The kind of directional coupler has microstrip type, waveguide type and coaxial type etc. from structure point; Branch line coupling, micro-band parallel coupled line coupling, Small aperture coupling etc. are had from coupled modes.The directional coupler of conventional microstrip form cannot overcome the larger shortcoming of area occupied, because which limit its application on portable microwave equipment.At present, the miniaturization of directional coupler has become a popular problem.
General, the Miniaturization Design of directional coupler has following several: 1, by building-out capacitor, improve the directivity of coupler and reduce size; 2, by introducing multiple open circuit minor matters, the miniaturization of micro-band hybrid ring is achieved; 3, the method that have employed T-shaped equivalence achieves miniaturization; 4, the fishbone equivalence that have employed main line, by-pass and coupling line achieves miniaturization, avoids the center overlap problem of T-shaped equivalence.But the third and the 4th kind of scheme are only theoretic emulation, do not consider the coupling effect of actual microwave device, the center superposition problem of T-shaped equivalence, and the coupling distortion of the fishbone equivalence of main line, by-pass and coupling line are serious.
Utility model content
The purpose of this utility model is to provide a kind of Mini Microstrip coupler, solves the center superposition problem of T-shaped equivalence.
The purpose of this utility model is achieved through the following technical solutions: Mini Microstrip coupler, comprise the microwave dielectric material plate that shape is rectangle, microwave dielectric material plate left side wall is provided with first interface and the 3rd interface, microwave dielectric material plate right side wall is provided with the second interface and the 4th interface, the front surface of microwave dielectric material plate is provided with axis the first coupling branch line parallel to each other and the second coupling branch line, the left end of the first coupling branch line is connected with first interface by first micro-band branch line, the right-hand member of the first coupling branch line is connected with the second interface by second micro-band branch line, the left end of the second coupling branch line is connected with the 3rd interface by the 3rd micro-band branch line, the right-hand member of the second coupling branch line is connected with the 4th interface by the 4th micro-band branch line, first micro-band branch line connects micro-band by first and is connected with the 3rd micro-band branch line, second micro-band branch line connects micro-band by second and is connected with the 4th micro-band branch line, first connects micro-band is connected with the first crack branch line towards the side that second connects micro-band, second connects micro-band is connected with the second crack branch line towards the side that first connects micro-band, first crack branch line and the second crack branch line symmetrical mutually, crack is there is between the first crack branch line and the second crack branch line, first coupling branch line is connected with cross microstrip line A towards the side of the second coupling branch line, second coupling branch line is connected with cross microstrip line B towards the side of the first coupling branch line, cross microstrip line A and cross microstrip line B is symmetrical arranged mutually, cross microstrip line A and cross microstrip line B forms decussate texture by a micro-band of transverse direction and vertical micro-band intersection, one end of vertical micro-band of cross microstrip line A is connected with the first middle part being coupled branch line, one end of vertical micro-band of cross microstrip line B is connected with the second middle part being coupled branch line.
In the structure of the two branch directional coupler of conventional microstrip, branch line length and its spacing are center phase wavelength.The characteristic impedance of its input, output port is Z0, and the two branch directional coupler size of traditional micro-band is comparatively large, herein by the symmetry equivalence of transmission line, devises a kind of two branch directional coupler of micro-band of miniaturization.Find after the equivalent electric circuit of the two branch directional coupler branch line of the micro-band of our analysis conventional, find after four sections of branch lines are carried out T-shaped equivalence, directional coupler core overlaps, and this can produce serious coupling phenomenon, affects the performance of directional coupler.And structure of the present utility model adopts symmetrical structure to form, form coupling by cross microstrip line A and cross microstrip line B, utilize the first crack branch line and the second crack branch line to form coupling, these 2 coupled structures form directional couple, improve the performance of directional couple.
Propose the design of the two branch directional coupler of micro-band of a miniaturization herein.The program is based on the principle of the two branch directional coupler of conventional microstrip, equivalence is carried out to the structure of branch's microstrip line, the more traditional two branch directional coupler areas of two branch directional couplers after equivalence reduce 51%, achieve the miniaturization of the two branch directional coupler of micro-band, finally machined material object, give test result.Measured result shows the two performance that branch directional coupler has good coupling in whole design frequency band, merit is divided and isolated of this micro-band.
The centre frequency of the two branch directional coupler of Mini Microstrip is f 0=1.6 GHz, and frequency range is 1.5 ~ 1.7 GHz, input/output end port impedance Z 0=50 Ω.Select the microwave dielectric material plate of F4B series.
The directional coupler of AV36580A vector network analyzer to processing is used to carry out actual measurement.According to each port S parameter, in 1.5 ~ 1.7 GHz bandwidth of operation, S11 is-15 dB, and centre frequency 1.6 GHz place S11 is-20 dB, and each input port achieves good coupling.Isolated port S41 is that-20 dB achieve good isolation.Straight-through end divides respond well with the merit of coupled end, has good consistency in required frequency band range internal strength proportion by subtraction maximum difference 0.5 dB. test result and simulation result.
Preferably, the width in described crack is equal with the width of vertical micro-band.
Preferably, the width of described first coupling branch line and the second coupling branch line is M1, and the width of first micro-band branch line, second micro-band branch line, the 3rd micro-band branch line, the 4th micro-band branch line is M2, and M1 is greater than M2.
Preferably, the impedance of first interface, the second interface, the 3rd interface, the 4th interface is 50 Ω.
Preferably, the relative dielectric constant of microwave dielectric material plate is 2.65, and the thickness of microwave dielectric material plate is 2 mm.
Preferably, first micro-band branch line, second micro-band branch line, the 3rd micro-band branch line, the 4th micro-band branch line, the first coupling branch line, the second coupling branch line, the first crack branch line, the second crack branch line, cross microstrip line A, cross microstrip line B, the micro-band of the first connection, second connect micro-band and are microstrip line.
The utility model has the advantage of: structure is simple, and volume significantly reduces, there is good coupling, performance that merit is divided and isolated.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Reference numeral in figure is expressed as: 11, first interface, the 12, second interface, the 13, the 3rd interface, 14, the 4th interface, 21, first micro-band branch line, 22, second micro-band branch line, 23, the 3rd micro-band branch line, the 24, the 4th micro-band branch line, the 31, first coupling branch line, 32, the second coupling branch line, the 41, first crack branch line, the 42, second crack branch line, 51, cross microstrip line A, 52, cross microstrip line B, 61, first connects micro-band, and 62, second connects micro-band.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but execution mode of the present utility model is not limited thereto.
Embodiment 1:
As shown in Figure 1.
Mini Microstrip coupler, comprise the microwave dielectric material plate that shape is rectangle, microwave dielectric material plate left side wall is provided with first interface 11 and the 3rd interface 13, microwave dielectric material plate right side wall is provided with the second interface 12 and the 4th interface 14, the front surface of microwave dielectric material plate is provided with axis the first coupling branch line 31 and the second coupling branch line 32 parallel to each other, the left end of the first coupling branch line 31 is connected with first interface 11 by first micro-band branch line 21, the right-hand member of the first coupling branch line 31 is connected with the second interface 12 by second micro-band branch line 22, the left end of the second coupling branch line 32 is connected with the 3rd interface 13 by the 3rd micro-band branch line 23, the right-hand member of the second coupling branch line 32 is connected with the 4th interface 14 by the 4th micro-band branch line 24, first micro-band branch line 21 connects micro-band 61 by first and is connected with the 3rd micro-band branch line 23, second micro-band branch line 22 connects micro-band 62 by second and is connected with the 4th micro-band branch line 24, first connects micro-band 61 is connected with the first crack branch line 41 towards the side that second connects micro-band 62, second connects micro-band 62 is connected with the second crack branch line 42 towards the side that first connects micro-band 61, first crack branch line 41 and the second crack branch line 42 are symmetrical mutually, crack is there is between the first crack branch line 41 and the second crack branch line 42, first coupling branch line 31 is connected with cross microstrip line A51 towards the side of the second coupling branch line 32, second coupling branch line 32 is connected with cross microstrip line B52 towards the side of the first coupling branch line 31, cross microstrip line A51 and cross microstrip line B52 is symmetrical arranged mutually, cross microstrip line A51 and cross microstrip line B52 forms decussate texture by a micro-band of transverse direction and vertical micro-band intersection, one end of vertical micro-band of cross microstrip line A51 is connected with the first middle part being coupled branch line 31, one end of vertical micro-band of cross microstrip line B52 is connected with the second middle part being coupled branch line 32.
In the structure of the two branch directional coupler of conventional microstrip, branch line length and its spacing are center phase wavelength.The characteristic impedance of its input, output port is Z0, and the two branch directional coupler size of traditional micro-band is comparatively large, herein by the symmetry equivalence of transmission line, devises a kind of two branch directional coupler of micro-band of miniaturization.Find after the equivalent electric circuit of the two branch directional coupler branch line of the micro-band of our analysis conventional, find after four sections of branch lines are carried out T-shaped equivalence, directional coupler core overlaps, and this can produce serious coupling phenomenon, affects the performance of directional coupler.And structure of the present utility model adopts symmetrical structure to form, coupling is formed by cross microstrip line A51 and cross microstrip line B52, utilize the first crack branch line 41 and the second crack branch line 42 to form coupling, these 2 coupled structures form directional couple, improve the performance of directional couple.
Propose the design of the two branch directional coupler of micro-band of a miniaturization herein.The program is based on the principle of the two branch directional coupler of conventional microstrip, equivalence is carried out to the structure of branch's microstrip line, the more traditional two branch directional coupler areas of two branch directional couplers after equivalence reduce 51%, achieve the miniaturization of the two branch directional coupler of micro-band, finally machined material object, give test result.Measured result shows the two performance that branch directional coupler has good coupling in whole design frequency band, merit is divided and isolated of this micro-band.
The centre frequency of the two branch directional coupler of Mini Microstrip is f 0=1.6 GHz, and frequency range is 1.5 ~ 1.7 GHz, input/output end port impedance Z 0=50 Ω.Select the microwave dielectric material plate of F4B series.
The directional coupler of AV36580A vector network analyzer to processing is used to carry out actual measurement.According to each port S parameter, in 1.5 ~ 1.7 GHz bandwidth of operation, S11 is-15 dB, and centre frequency 1.6 GHz place S11 is-20 dB, and each input port achieves good coupling.Isolated port S41 is that-20 dB achieve good isolation.Straight-through end divides respond well with the merit of coupled end, has good consistency in required frequency band range internal strength proportion by subtraction maximum difference 0.5 dB. test result and simulation result.
Preferably, the width in described crack is equal with the width of vertical micro-band.
Preferably, the width of described first coupling branch line 31 and the second coupling branch line 32 is M1, and the width of first micro-band branch line, second micro-band branch line, the 3rd micro-band branch line, the 4th micro-band branch line is M2, and M1 is greater than M2.
Preferably, the impedance of first interface, the second interface, the 3rd interface, the 4th interface is 50 Ω.
Preferably, the relative dielectric constant of microwave dielectric material plate is 2.65, and the thickness of microwave dielectric material plate is 2 mm.
Preferably, first micro-band branch line, second micro-band branch line, the 3rd micro-band branch line, the 4th micro-band branch line, the first coupling branch line, the second coupling branch line, the first crack branch line, the second crack branch line, cross microstrip line A, cross microstrip line B, the micro-band of the first connection, second connect micro-band and are microstrip line.
As mentioned above, then well the utility model can be realized.
Claims (6)
1. Mini Microstrip coupler, it is characterized in that: comprise the microwave dielectric material plate that shape is rectangle, microwave dielectric material plate left side wall is provided with first interface (11) and the 3rd interface (13), microwave dielectric material plate right side wall is provided with the second interface (12) and the 4th interface (14), the front surface of microwave dielectric material plate is provided with axis the first coupling branch line (31) parallel to each other and the second coupling branch line (32), the left end of the first coupling branch line (31) is connected with first interface (11) by first micro-band branch line (21), the right-hand member of the first coupling branch line (31) is connected with the second interface (12) by second micro-band branch line (22), the left end of the second coupling branch line (32) is connected with the 3rd interface (13) by the 3rd micro-band branch line (23), the right-hand member of the second coupling branch line (32) is connected with the 4th interface (14) by the 4th micro-band branch line (24), first micro-band branch line (21) connects micro-band (61) by first and is connected with the 3rd micro-band branch line (23), second micro-band branch line (22) connects micro-band (62) by second and is connected with the 4th micro-band branch line (24), first connects micro-band (61) is connected with the first crack branch line (41) towards the side that second connects micro-band (62), second connects micro-band (62) is connected with the second crack branch line (42) towards the side that first connects micro-band (61), first crack branch line (41) and the second crack branch line (42) are symmetrical mutually, crack is there is between the first crack branch line (41) and the second crack branch line (42), first coupling branch line (31) is connected with cross microstrip line A(51 towards the side of the second coupling branch line (32)), second coupling branch line (32) is connected with cross microstrip line B(52 towards the side of the first coupling branch line (31)), cross microstrip line A(51) and cross microstrip line B(52) be symmetrical arranged mutually, cross microstrip line A(51) and cross microstrip line B(52) be form decussate texture by a micro-band of transverse direction and vertical micro-band intersection, cross microstrip line A(51) the be coupled middle part of branch line (31), one end and first of vertical micro-band be connected, cross microstrip line B(52) the be coupled middle part of branch line (32), one end and second of vertical micro-band be connected.
2. Mini Microstrip coupler according to claim 1, is characterized in that: the width in described crack is equal with the width of vertical micro-band.
3. Mini Microstrip coupler according to claim 1, it is characterized in that: the width of described first coupling branch line (31) and the second coupling branch line (32) is M1, the width of first micro-band branch line, second micro-band branch line, the 3rd micro-band branch line, the 4th micro-band branch line is M2, and M1 is greater than M2.
4. Mini Microstrip coupler according to claim 1, is characterized in that: the impedance of first interface, the second interface, the 3rd interface, the 4th interface is 50 Ω.
5. Mini Microstrip coupler according to claim 1, is characterized in that: the relative dielectric constant of microwave dielectric material plate is 2.65, and the thickness of microwave dielectric material plate is 2 mm.
6. according to the Mini Microstrip coupler in claim 1-5 described in any one, it is characterized in that: first micro-band branch line, second micro-band branch line, the 3rd micro-band branch line, the 4th micro-band branch line, the first coupling branch line, the second coupling branch line, the first crack branch line, the second crack branch line, cross microstrip line A, cross microstrip line B, the micro-band of the first connection, second connect micro-band and be microstrip line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520498198.0U CN204706621U (en) | 2015-07-10 | 2015-07-10 | Mini Microstrip coupler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520498198.0U CN204706621U (en) | 2015-07-10 | 2015-07-10 | Mini Microstrip coupler |
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| CN204706621U true CN204706621U (en) | 2015-10-14 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112909473A (en) * | 2021-02-09 | 2021-06-04 | 江苏势通生物科技有限公司 | Improved annular directional coupler circuit |
| CN115347342A (en) * | 2021-05-12 | 2022-11-15 | 南宁富联富桂精密工业有限公司 | Branch coupler |
-
2015
- 2015-07-10 CN CN201520498198.0U patent/CN204706621U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112909473A (en) * | 2021-02-09 | 2021-06-04 | 江苏势通生物科技有限公司 | Improved annular directional coupler circuit |
| CN115347342A (en) * | 2021-05-12 | 2022-11-15 | 南宁富联富桂精密工业有限公司 | Branch coupler |
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