CN204271236U - The miniaturized directional coupler of a kind of broadband - Google Patents
The miniaturized directional coupler of a kind of broadband Download PDFInfo
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- CN204271236U CN204271236U CN201420702132.4U CN201420702132U CN204271236U CN 204271236 U CN204271236 U CN 204271236U CN 201420702132 U CN201420702132 U CN 201420702132U CN 204271236 U CN204271236 U CN 204271236U
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- directional coupler
- transmission line
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- amplitude equalization
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Abstract
The utility model discloses the miniaturized directional coupler of a kind of broadband, comprise main transmission line, two ports of main transmission line are respectively the input port of described directional coupler, straightthrough port, also comprise amplitude equalization network I, isolation resistor I, the secondary transmission line I be coupled with main transmission line, main transmission line and secondary transmission line I form coupled microstrip line I, wherein one end of amplitude equalization network I is connected with the coupled end of coupled microstrip line I, the other end is the coupling aperture of described directional coupler, one end of isolation resistor I is connected with the isolation end of coupled microstrip line I, other end ground connection.The miniaturized directional coupler of broadband of the present utility model, working band is wide, size is little, manufacturing process is simple, production cost is low.
Description
Technical field
The utility model relates to radio circuit design field, particularly the miniaturized directional coupler of a kind of broadband.
Background technology
Directional coupler is a kind of radio-frequency devices of extensive use in radio system, and its essence is that radiofrequency signal is carried out power division according to a certain percentage, and the radiofrequency signal transmitted in main transmission line is coupled out a part, for power detection.Directional coupler is generally four port networks, and the first port is input, the second port is straight-through end, and the transmission line between the first port and the second port is main transmission line; Another transmission line is secondary transmission line (i.e. coupling line), and port adjacent with the first port in secondary transmission line is coupled end, and a port is in addition then isolation end.
The technical indicator of directional coupler mainly contains the degree of coupling, bandwidth of operation, insertion loss, the flatness of the degree of coupling and directivity.Prior art has the following disadvantages: the mode of the first, traditional diplopore magnet ring coiling, and power capacity is relatively little, logical high-power time can produce certain non-linear, produce interference signal, affect communication efficiency; The second, adopt the mode of λ/4 transmission line coupler, multistage cascade must be adopted could to realize broadband and use, when VHF/UHF frequency range uses, operation wavelength is longer, adds that exponent number is many, and Insertion Loss and size are all larger.
Utility model content
The purpose of this utility model is that the shortcoming overcoming prior art is with not enough, provides a kind of broadband miniaturized directional coupler.
The purpose of this utility model is realized by following technical scheme:
The miniaturized directional coupler of a kind of broadband, comprise main transmission line, two ports of main transmission line are respectively input port, the straightthrough port of described directional coupler, also comprise amplitude equalization network I, isolation resistor I, the secondary transmission line I that is coupled with main transmission line, main transmission line and secondary transmission line I form coupled microstrip line I, wherein one end of amplitude equalization network I is connected with the coupled end of coupled microstrip line I, the other end is the coupling aperture of described directional coupler, one end of isolation resistor I is connected with the isolation end of coupled microstrip line I, other end ground connection.
Described amplitude equalization network I is for having the equalizing network of every octave decay 6dB transmission characteristic.
Described amplitude equalization network I, comprise resistor R1, R2, R3, and inductor L1, wherein R2, R3 are connected in parallel to the coupling aperture of described directional coupler, the other end ground connection of R2, the other end of R3 and R1 are connected in parallel to the other end ground connection of inductance L 1, R1, and the other end of L1 is connected with the coupled end of coupled microstrip line I.
The miniaturized directional coupler of described broadband, also comprise amplitude equalization network II, isolation resistor II, the secondary transmission line II that is coupled with main transmission line, main transmission line and secondary transmission line II form coupled microstrip line II, wherein one end of amplitude equalization network II is connected with the coupled end of coupled microstrip line II, the other end is the coupling aperture of described directional coupler, one end of isolation resistor II is connected with the isolation end of coupled microstrip line II, other end ground connection; Described amplitude equalization network I, secondary transmission line I, isolation resistor I and amplitude equalization network II, secondary transmission line II, isolation resistor II are arranged in the both sides of the vertical line of main transmission line in Mirror Symmetry.The miniaturized directional coupler of broadband of the present utility model, realize amphiorentation, can align reciprocal signal simultaneously and sample, and forward and reverse sampling works alone separately, forward and reverse isolation is greater than 20dB.
Described amplitude equalization network II is for having the equalizing network of every octave decay 6dB transmission characteristic.
Described amplitude equalization network II, comprise resistor R5, R6, R7, and inductor L2, wherein R6, R7 are connected in parallel to the coupling aperture of described directional coupler, the other end ground connection of R6, the other end of R7 and R5 are connected in parallel to the other end ground connection of inductance L 2, R5, and the other end of L2 is connected with the coupled end of coupled microstrip line II.
Compared with prior art, tool has the following advantages and beneficial effect the utility model:
1, the miniaturized directional coupler of broadband described in the utility model does not need to adopt multi-stage cascade, can realize broadband and use, and Insertion Loss is little, and can realize Coupling flatness in VHF/UHF frequency range across octave use and be not more than ± 0.3dB, Insertion Loss is less than 0.2dB.
2, the miniaturized directional coupler size of broadband described in the utility model is little, production technology simple, cost is lower, adopt coupled microstrip line and amplitude equalization real-time performance, significantly reduce the size of coupler, coupler adopts PCB fabric swatch printed circuit simultaneously, device adopts attachment, and production technology is simple, cost is lower.
Accompanying drawing explanation
Fig. 1 is a kind of broadband dual directional coupler described in the utility model.
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.
As Fig. 1, the miniaturized directional coupler of a kind of broadband, comprise main transmission line, two ports of main transmission line are respectively input port, the straightthrough port of described directional coupler, also comprise amplitude equalization network I, isolation resistor I, the secondary transmission line I that is coupled with main transmission line, main transmission line and secondary transmission line I form coupled microstrip line I, wherein one end of amplitude equalization network I is connected with the coupled end of coupled microstrip line I, the other end is the coupling aperture of described directional coupler, one end of isolation resistor I is connected with the isolation end of coupled microstrip line I, other end ground connection;
The miniaturized directional coupler of described broadband, also comprise amplitude equalization network II, isolation resistor II, the secondary transmission line II that is coupled with main transmission line, main transmission line and secondary transmission line II form coupled microstrip line II, wherein one end of amplitude equalization network II is connected with the coupled end of coupled microstrip line II, the other end is the coupling aperture of described directional coupler, one end of isolation resistor II is connected with the isolation end of coupled microstrip line II, other end ground connection; Described amplitude equalization network I, secondary transmission line I, isolation resistor I and amplitude equalization network II, secondary transmission line II, isolation resistor II are arranged in the both sides of the vertical line of main transmission line in Mirror Symmetry;
Described amplitude equalization network I, comprise resistor R1, R2, R3, and inductor L1, wherein R2, R3 are connected in parallel to the coupling aperture of described directional coupler, the other end ground connection of R2, the other end of R3 and R1 are connected in parallel to the other end ground connection of inductance L 1, R1, and the other end of L1 is connected with the coupled end of coupled microstrip line I;
Described amplitude equalization network II, comprise resistor R5, R6, R7, and inductor L2, wherein R6, R7 are connected in parallel to the coupling aperture of described directional coupler, the other end ground connection of R6, the other end of R7 and R5 are connected in parallel to the other end ground connection of inductance L 2, R5, and the other end of L2 is connected with the coupled end of coupled microstrip line II;
Described isolation resistor I is R4, and isolation resistor II is R8.
Its specific works process is as follows:
As Fig. 1, resistor R1, R2, R5, R6 value 120 Ω, resistor R 4, R 8 value 60 Ω (capacitor in parallel adopting two resistances to be 120 Ω obtains), inductor L1, L2 value 82nH, within the scope of 225MHz ~ 512MHz working frequency range, the directional coupler degree of coupling is 48.8dB, and flatness is not more than ± 0.3dB, directivity is greater than 20dB, and the overall structure size of dual directional coupler is only 38mm × 20mm × 2mm.
As Fig. 1, our definition signal is forward from Port1 input to the direction of Port2 transmission, and signal is reverse from Port2 input to the direction of Port1 transmission.For forward list directional coupler, Port1 is input port, and Port2 is straightthrough port, and Port3 is coupling aperture, and isolation end is connected with resistor R4, and the resistance of adjustment R4 can make forward list directional coupler obtain good directivity; For reverse single directional coupler, Port2 is input port, and Port1 is straightthrough port, Port4 is coupling aperture, isolation end is connected with R8, and the resistance of adjustment R8 can make reverse single directional coupler obtain good directivity, and wherein the resistance value of resistor R4 with R8 is identical.
In actual use, Port1 is connected with the radio frequency delivery outlet of high-power broadband linear radio-frequency power amplifier, and Port2 is connected with the rf input port of antenna.The sampling mechanism of forward list directional coupler is as follows: when the high-power RF signal that radio-frequency (RF) power amplification exports transmits to Port2 from Port1 input along micro-band main transmission line, the secondary transmission line of micro-band is coupled out a part of signal energy by coupling gap from micro-band main transmission line and delivers to equalizing network, when the length of coupled zone be less than operation wavelength ten/for the moment, its amplitude-versus-frequency curve of the signal being coupled out will increase the rule change of 6dB by every octave; By the inductance value of inductor L1 in reasonable disposition equalizing network, the resistance value of resistor R1, R2 and R3, the transfer curve of equalizing network can be made to increase the rule change of 6dB by every octave attenuation; Inductor L1 is mainly used in the centre frequency regulating forward list directional coupler, and inductance value increases, and centre frequency will decrease.The ∏ type attenuation network be made up of resistor R1, R2 and R3 is mainly used in the degree of coupling regulating forward list directional coupler, when the pad value of attenuation network increases, the degree of coupling of forward list directional coupler increases, and this attenuation network is also for regulating the port Impedance of forward coupling aperture Port3 to mate simultaneously.
When antenna opening because impedance mismatching produces reflex time, reflected signal transmits to Port1 from Port2 input along micro-band main transmission line, the sampling mechanism of reverse single directional coupler is identical with the sampling mechanism of above-mentioned forward list directional coupler, wherein, L2 is for regulating the centre frequency of reverse single directional coupler, and the ∏ type attenuation network be made up of resistor R5, R6 and R7 is mainly used in regulating the degree of coupling of reverse single directional coupler and the port Impedance coupling of reverse coupled mouth Port4.Wherein resistor R5, R6, R1 is identical with the resistance value of R2, the resistance value of resistor R4 with R8 is identical, the resistance value of resistor R7 with R3 is identical, and the inductance value of inductor L2 with L1 is identical, and reverse single directional coupler is identical with the index such as the degree of coupling, isolation of forward list directional coupler.
Namely forward list directional coupler forms dual directional coupler after being directly connected with reverse single directional coupler, can sample to forward signal and reverse signal simultaneously.
Above-described embodiment is the utility model preferably execution mode; but execution mode of the present utility model is not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present utility model and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection range of the present utility model.
Claims (6)
1. the miniaturized directional coupler of broadband, it is characterized in that: comprise main transmission line, two ports of main transmission line are respectively the input port of described directional coupler, straightthrough port, also comprise amplitude equalization network I, isolation resistor I, the secondary transmission line I be coupled with main transmission line, main transmission line and secondary transmission line I form coupled microstrip line I, wherein one end of amplitude equalization network I is connected with the coupled end of coupled microstrip line I, the other end is the coupling aperture of described directional coupler, one end of isolation resistor I is connected with the isolation end of coupled microstrip line I, other end ground connection.
2. the miniaturized directional coupler of broadband according to claim 1, is characterized in that: described amplitude equalization network I is for having the equalizing network of every octave decay 6dB transmission characteristic.
3. the miniaturized directional coupler of broadband according to claim 2, it is characterized in that: described amplitude equalization network I, comprise resistor R1, R2, R3, and inductor L1, wherein R2, R3 are connected in parallel to the coupling aperture of described directional coupler, the other end ground connection of R2, and the other end of R3 and R1 are connected in parallel to inductance L 1, the other end ground connection of R1, the other end of L1 is connected with the coupled end of coupled microstrip line I.
4. the miniaturized directional coupler of broadband according to claim 1, it is characterized in that: also comprise amplitude equalization network II, isolation resistor II, the secondary transmission line II that is coupled with main transmission line, main transmission line and secondary transmission line II form coupled microstrip line II, wherein one end of amplitude equalization network II is connected with the coupled end of coupled microstrip line II, the other end is the coupling aperture of described directional coupler, one end of isolation resistor II is connected with the isolation end of coupled microstrip line II, other end ground connection; Described amplitude equalization network I, secondary transmission line I, isolation resistor I and amplitude equalization network II, secondary transmission line II, isolation resistor II are arranged in the both sides of the vertical line of main transmission line in Mirror Symmetry.
5. the miniaturized directional coupler of broadband according to claim 4, is characterized in that: described amplitude equalization network II is for having the equalizing network of every octave decay 6dB transmission characteristic.
6. the miniaturized directional coupler of broadband according to claim 5, it is characterized in that: described amplitude equalization network II, comprise resistor R5, R6, R7, and inductor L2, wherein R6, R7 are connected in parallel to the coupling aperture of described directional coupler, the other end ground connection of R6, and the other end of R7 and R5 are connected in parallel to inductance L 2, the other end ground connection of R5, the other end of L2 is connected with the coupled end of coupled microstrip line II.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420702132.4U CN204271236U (en) | 2014-11-20 | 2014-11-20 | The miniaturized directional coupler of a kind of broadband |
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| CN201420702132.4U CN204271236U (en) | 2014-11-20 | 2014-11-20 | The miniaturized directional coupler of a kind of broadband |
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| CN204271236U true CN204271236U (en) | 2015-04-15 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106100595A (en) * | 2015-11-20 | 2016-11-09 | 厦门宇臻集成电路科技有限公司 | A kind of power amplifier of band wide-band coupler |
| CN106816679A (en) * | 2017-03-24 | 2017-06-09 | 西安科技大学 | A kind of orientation electric bridge based on parallel-plate transmission line |
| CN112510338A (en) * | 2020-12-14 | 2021-03-16 | 上海创远仪器技术股份有限公司 | Micro ultra-wideband single directional coupler device |
| CN112751151A (en) * | 2020-12-24 | 2021-05-04 | 武汉大学 | High-performance miniaturized directional coupler chip |
| CN115603022A (en) * | 2022-12-01 | 2023-01-13 | 成都市四度空间科技有限公司（Cn） | UHF frequency band ultra-wideband high-power radio frequency power coupler |
| CN117517769A (en) * | 2024-01-08 | 2024-02-06 | 深圳市瀚强科技股份有限公司 | Debug circuit, control method of debug circuit and radio frequency power detection circuit |
-
2014
- 2014-11-20 CN CN201420702132.4U patent/CN204271236U/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106100595A (en) * | 2015-11-20 | 2016-11-09 | 厦门宇臻集成电路科技有限公司 | A kind of power amplifier of band wide-band coupler |
| CN106100595B (en) * | 2015-11-20 | 2019-04-26 | 厦门宇臻集成电路科技有限公司 | A kind of power amplifier with wide-band coupler |
| CN106816679A (en) * | 2017-03-24 | 2017-06-09 | 西安科技大学 | A kind of orientation electric bridge based on parallel-plate transmission line |
| CN112510338A (en) * | 2020-12-14 | 2021-03-16 | 上海创远仪器技术股份有限公司 | Micro ultra-wideband single directional coupler device |
| CN112751151A (en) * | 2020-12-24 | 2021-05-04 | 武汉大学 | High-performance miniaturized directional coupler chip |
| CN112751151B (en) * | 2020-12-24 | 2021-12-17 | 武汉大学 | High-performance miniaturized directional coupler chip |
| CN115603022A (en) * | 2022-12-01 | 2023-01-13 | 成都市四度空间科技有限公司（Cn） | UHF frequency band ultra-wideband high-power radio frequency power coupler |
| CN115603022B (en) * | 2022-12-01 | 2023-03-14 | 成都市四度空间科技有限公司 | UHF frequency band ultra-wideband high-power radio frequency power coupler |
| CN117517769A (en) * | 2024-01-08 | 2024-02-06 | 深圳市瀚强科技股份有限公司 | Debug circuit, control method of debug circuit and radio frequency power detection circuit |
| CN117517769B (en) * | 2024-01-08 | 2024-04-09 | 深圳市瀚强科技股份有限公司 | Debug circuit, control method of debug circuit and radio frequency power detection circuit |
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