CN111786068B - Broadband directional coupler with harmonic suppression function - Google Patents
Broadband directional coupler with harmonic suppression function Download PDFInfo
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- CN111786068B CN111786068B CN202010778733.3A CN202010778733A CN111786068B CN 111786068 B CN111786068 B CN 111786068B CN 202010778733 A CN202010778733 A CN 202010778733A CN 111786068 B CN111786068 B CN 111786068B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
- H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
- H01P5/18—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers
- H01P5/184—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers the guides being strip lines or microstrips
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Abstract
The invention discloses a broadband directional coupler with a harmonic suppression function, which has the specific scheme that: the power supply comprises a first inductance loading directional coupler, a second inductance loading directional coupler, a third inductance loading directional coupler and a 50-ohm input/output port. The bandwidth of the coupler is determined by the characteristic impedance and inductance values of the odd-even mode of the first, second and third inductively loaded parallel coupled lines. The coupling degree of the second inductance loading parallel coupling line is greater than the coupling degree of the first inductance loading parallel coupling line and the third inductance loading parallel coupling line. The broadband directional coupler with the harmonic suppression function provided by the invention has the advantages of wider impedance bandwidth, flatter output amplitude and phase difference and harmonic suppression function. In addition, the coupler also has the advantages of simple structure and small volume.
Description
Technical Field
The invention belongs to the technical field of electronics, relates to a microwave device, and particularly relates to a broadband directional coupler with a harmonic suppression function.
Background
The directional coupler, as a microwave/millimeter wave device, can be used for distributing or synthesizing microwave signal power, and is often applied to frequency sweep tests for monitoring power, frequency and frequency spectrum, extracting signals, stabilizing source output power, transmitting and reflecting, and the like. The microstrip directional coupler is a planar directional coupler which can be realized by printed circuit board technology, and is characterized by small volume and easy integration. The microstrip directional coupler can be divided into the same direction, the reverse direction and the cross directional coupler according to the position of the isolation port relative to the input port. Most couplers are only suitable for use in narrow band circuits, since the bandwidth is limited to 10% -20%. Meanwhile, because the inherent parasitic harmonic of the distributed element may interfere with or reduce the performance of the system, in order to improve the bandwidth and suppress the parasitic harmonic, so as to be widely applied and improve the performance of the system, the broadband directional coupler with the harmonic suppression function is invented.
Disclosure of Invention
According to the problems existing in the prior art, the invention discloses a broadband directional coupler with a harmonic suppression function, which has the specific scheme that: the power supply comprises a first power-saving inductive loading directional coupler, a second power-saving inductive loading directional coupler, a third power-saving inductive loading directional coupler and a 50-ohm input/output port;
the first inductance loading directional coupler comprises a first inductance loading parallel coupling line and a first open-circuit branch; the second inductance loading directional coupler comprises a second inductance loading parallel coupling line and a second open-circuit branch; the third section of the inductive loading directional coupler comprises a third inductive loading parallel coupling line and a third open-circuit branch section; the first inductance loading parallel coupling line comprises a first coupling line, a second coupling line and a first inductance; the second inductance loading parallel coupling line comprises a third coupling line, a fourth coupling line and a second inductance; the third section of inductance loading parallel coupling line comprises a fifth coupling line, a sixth coupling line and a third inductance;
the first open-circuit branch knot is connected with the middle part of the first inductance loading parallel coupling line in parallel, the second open-circuit branch knot is connected with the middle part of the second inductance loading parallel coupling line in parallel, the third open-circuit branch knot is connected with the middle part of the third inductance loading parallel coupling line in parallel, the first inductor is bridged over the middle parts of the first coupling line and the second coupling line, the second inductor is bridged over the middle parts of the third coupling line and the fourth coupling line, and the third inductor is bridged over the middle parts of the fifth coupling line and the sixth coupling line; the right end of the first inductance loading parallel coupling line is connected with the left end of the second inductance loading parallel coupling line, and the right end of the second inductance loading parallel coupling line is connected with the left end of the third inductance loading parallel coupling line;
the first section of the inductive loading directional coupler has the same circuit parameters as the third section of the inductive loading directional coupler; the first inductance loading parallel coupling line, the second inductance loading parallel coupling line and the third inductance loading parallel coupling line have the same electrical length which is 90 degrees; the first open-circuit branch, the second open-circuit branch and the third open-circuit branch are the same in electrical length and are all 45 degrees.
The harmonic rejection characteristics of the coupler are determined by the electrical lengths of the first open-circuit branch, the second open-circuit branch, and the third open-circuit branch.
The bandwidth of the coupler is determined by the characteristic impedance and inductance values of the odd-even mode of the first, second and third inductively loaded parallel coupled lines.
The coupling degree of the second inductance loading parallel coupling line is greater than the coupling degree of the first inductance loading parallel coupling line and the third inductance loading parallel coupling line.
Due to the adoption of the technical scheme, the broadband directional coupler with the harmonic suppression function has the advantages of wide impedance bandwidth, flat output amplitude and phase difference and harmonic suppression function. In addition, the coupler also has the advantages of simple structure and small volume.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram of a broadband directional coupler with harmonic suppression according to the present invention;
FIG. 2 is an equivalent circuit diagram of odd and even modes of the broadband directional coupler with harmonic suppression according to the present invention;
FIG. 3 is a S-parameter curve of a broadband directional coupler with harmonic suppression according to the present invention;
fig. 4 is a phase curve between output ports of the broadband directional coupler with harmonic suppression according to the present invention.
In the figure: 1. the inductive coupling device comprises a first inductive loading type directional coupler, 2, a second inductive loading type directional coupler, 3, a third inductive loading type directional coupler, 11, a first inductive loading parallel coupling line, 12, a second inductive loading parallel coupling line, 13, a third inductive loading parallel coupling line, 21, a first open-circuit branch knot, 22, a second open-circuit branch knot, 23, a third open-circuit branch knot, 111, a first coupling line, 112, a second coupling line, 121, a third coupling line, 122, a fourth coupling line, 131, a fifth coupling line, 132, a sixth coupling line, 113, a first inductor, 123, a second inductor, 133 and a third inductor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Fig. 1 is a schematic structural diagram of a broadband directional coupler with harmonic suppression function according to the present invention, and the directional coupler of the present embodiment may include: a first inductance loading directional coupler 1, a second inductance loading directional coupler 2, a third inductance loading directional coupler 3 and a 50 ohm input/output port 4. The first inductance loading directional coupler 1 comprises a first inductance loading parallel coupling line 11 and a first open-circuit branch 21; the second inductance loading directional coupler 2 comprises a second inductance loading parallel coupling line 12 and a second open-circuit branch 22; the third inductive loading directional coupler 3 comprises a third inductive loading parallel coupling line 13 and a third open-circuit branch 23;
further, the first inductively loaded parallel coupled line 11 includes a first coupled line 111, a second coupled line 112, and a first inductor 113; the second inductively loaded parallel coupled line 12 includes a third coupled line 121, a fourth coupled line 122, and a second inductor 123; the third inductively loaded parallel coupled line 13 includes a fifth coupled line 131, a sixth coupled line 132, and a third inductor 133.
Further, the first open-circuit branch 21 is connected with the middle part of the first inductance loading parallel coupling line 11, the second open-circuit branch 22 is connected with the middle part of the second inductance loading parallel coupling line 12, and the third open-circuit branch 23 is connected with the middle part of the third inductance loading parallel coupling line 13; the first inductor 113 is located between the first coupling line 111 and the second coupling line 112, the second inductor 123 is located between the third coupling line 121 and the fourth coupling line 122, and the third inductor 133 is located between the fifth coupling line 131 and the sixth coupling line 132; the right end of the first inductance loading parallel coupling line 11 is connected with the left end of the second inductance loading parallel coupling line 12, and the right end of the second inductance loading parallel coupling line 12 is connected with the left end of the third inductance loading parallel coupling line 13; the first inductance loading directional coupler 1 and the third inductance loading directional coupler 3 have the same circuit parameters; the first inductance loading parallel coupling line 11, the second inductance loading parallel coupling line 12 and the third inductance loading parallel coupling line 13 are the same in electrical length, and are all 90 degrees; the first open-circuit branch 21, the second open-circuit branch 22 and the third open-circuit branch 23 have the same electrical length, which is 45 degrees. The harmonic rejection characteristics of the coupler are determined by the electrical lengths of the first open-circuit branch 21, the second open-circuit branch 22 and the third open-circuit branch 23. The bandwidth of the coupler is determined by the odd-even-mode characteristic impedance and inductance values of the first, second and third inductively-loaded parallel coupled lines 11, 12 and 13. The coupling degree of the second inductance loading parallel coupling line 12 is greater than the coupling degree of the first inductance loading parallel coupling line 11 and the third inductance loading parallel coupling line 13.
Specifically, in this embodiment, an equal power ratio between the two output ports can be realized. And converting the four-port network of the coupler into a single-port network by using an odd-even mode analysis method for analysis, and calculating circuit parameters.
Under the excitation of the even mode, the current on the symmetrical plane of the directional coupler is zero, and the directional coupler is equivalently an open circuit. Fig. 2(a) shows an even-mode equivalent circuit of a broadband directional coupler with harmonic suppression. Z1eLoading the first inductor with the parallel coupled line 11 and the third inductor with the parallel coupled line13 even mode characteristic impedance, Z2eLoading the inductance with the characteristic impedance of the even mode, Z, of the parallel coupled line 121Is the characteristic impedance, Z, of the first and third open branches 21, 232Is the characteristic impedance, θ, of the open stub 221The electrical length theta of the parallel coupling for the first, second and third inductively-loaded parallel coupled lines 11, 122The electrical lengths of the first and third open- circuit branches 21 and 23 are the open-circuit branches θ3The electrical length of the open stub 22.
Under the excitation of an odd mode, the voltage on the symmetrical plane of the directional coupler is zero, and the voltage is equivalent to a short circuit. Fig. 2(b) shows an odd-mode equivalent circuit of the broadband directional coupler with harmonic suppression. Z1oThe odd-mode characteristic impedance, Z, of the first and third inductively-loaded parallel-coupled lines 11 and 132oLoading the inductance with the odd-mode characteristic impedance, Z, of the parallel coupled line 121Is the characteristic impedance, Z, of the first and third open branches 21, 232Is the characteristic impedance, θ, of the open stub 221The electrical lengths, theta, of the first, second and third inductively-loaded parallel coupled lines 11, 12, 132Is the electrical length of the first and third open branches 21, 23, θ3Is the electrical length, L, of the open stub 221The inductance value of the inductance, L, connected between the first and second coupled lines and between the fifth and sixth coupled lines2The inductance of the inductor connected across the third and fourth coupled lines.
In the embodiment of the invention, the center frequency of the coupler is 1.4GHz, the coupling degree is 3dB, and the impedance Z of the input/output port 050 Ω. Selecting theta1＝90°、θ2＝45°、θ3＝45°，Z1e＝72.8Ω、Z1o＝34Ω，Z2e＝80.2Ω、Z2o＝24Ω、Z1＝90Ω、Z2＝120Ω、L1＝14nH、L29 nH. The broadband directional coupler with the harmonic suppression function is designed according to the selected characteristic impedance and the electrical length. As shown in FIGS. 3 and 4, the wide band of the present embodimentDirectional coupler, return loss (| S)11|<-15dB) greater than 15dB, 62.3% (0.829 GHz-1.701 GHz), isolation (| S)41|<-15dB) is greater than 15dB, is 61.4% (0.848GHz to 1.708GHz), is 40.5% (1.008GHz to 1.575GHz) with a coupling degree of 3 ± 0.5dB, and is 55.9% (0.877GHz to 1.66GHz) with a relative bandwidth with a phase difference of 90 ° ± 1 ° between output ports. As shown in fig. 3, there is a significant transmission zero at 2.8GHz, making the rejection greater than 30dB at the second harmonic, due to the transmission zero introduced by the open stubs.
The technical indexes adopted by the embodiment are as follows:
frequency range: 1.1 GHz-1.6 GHz;
input-output port impedance: z0＝50Ω；
Coupling degree: 3 +/-0.5 dB;
return loss: >15 dB;
isolation degree: >15 dB;
phase difference between output ports: 90 ° ± 1 °.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (4)
1. A broadband directional coupler having harmonic suppression, comprising: the system comprises a first inductance loading directional coupler (1), a second inductance loading directional coupler (2), a third inductance loading directional coupler (3) and a 50 ohm input/output port (4);
the first inductance loading directional coupler (1) comprises a first inductance loading parallel coupling line (11) and a first open-circuit branch (21); the second inductance loading directional coupler (2) comprises a second inductance loading parallel coupling line (12) and a second open-circuit branch (22); the third section of the inductive loading directional coupler (3) comprises a third inductive loading parallel coupling line (13) and a third open-circuit branch (23); the first inductance loading parallel coupling line (11) comprises a first coupling line (111), a second coupling line (112) and a first inductance (113); the second inductance loading parallel coupling line (12) comprises a third coupling line (121), a fourth coupling line (122) and a second inductance (123); the third inductively loaded parallel coupled line (13) comprises a fifth coupled line (131), a sixth coupled line (132) and a third inductor (133);
the first open-circuit branch (21) is connected in parallel with the middle of the first inductance loading parallel coupling line (11), the second open-circuit branch (22) is connected in parallel with the middle of the second inductance loading parallel coupling line (12), the third open-circuit branch (23) is connected in parallel with the middle of the third inductance loading parallel coupling line (13), the first inductance (113) is bridged between the middle of the first coupling line (111) and the second coupling line (112), the second inductance (123) is bridged between the middle of the third coupling line (121) and the fourth coupling line (122), and the third inductance (133) is bridged between the middle of the fifth coupling line (131) and the sixth coupling line (132); one end of the first inductance loading parallel coupling line (11) is connected with one end of the second inductance loading parallel coupling line (12), and the other end of the second inductance loading parallel coupling line (12) is connected with one end of the third inductance loading parallel coupling line (13);
the first section of the inductive loading directional coupler (1) has the same circuit parameters as the third section of the inductive loading directional coupler (3); the first inductance loading parallel coupling line (11), the second inductance loading parallel coupling line (12) and the third inductance loading parallel coupling line (13) are the same in electrical length and are all 90 degrees; the first open-circuit branch (21), the second open-circuit branch (22) and the third open-circuit branch (23) are the same in electrical length and are all 45 degrees.
2. A broadband directional coupler having a harmonic suppression function according to claim 1, wherein: the harmonic suppression characteristics of the coupler are determined by the electrical lengths of the first open-circuit branch (21), the second open-circuit branch (22), and the third open-circuit branch (23).
3. A broadband directional coupler having a harmonic suppression function according to claim 1, wherein: the bandwidth of the coupler is determined by the odd-even-mode characteristic impedance and inductance values of the first inductively loaded parallel coupled line (11), the second inductively loaded parallel coupled line (12) and the third inductively loaded parallel coupled line (13).
4. A broadband directional coupler having a harmonic suppression function according to claim 1, wherein: the coupling degree of the second inductance loading parallel coupling line (12) is greater than the coupling degree of the first inductance loading parallel coupling line (11) and the third inductance loading parallel coupling line (13).
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| CN112563712B (en) * | 2020-11-30 | 2021-12-03 | 大连海事大学 | Terminating complex impedance directional coupler with harmonic suppression function and design method |
| CN114204241B (en) * | 2021-12-07 | 2022-10-21 | 杭州电子科技大学 | Microstrip-open slot line coupling dual-band 90-degree directional coupler |
| CN114709576B (en) * | 2022-04-21 | 2024-04-30 | 交通运输部公路科学研究所 | Microstrip duplexer applied to Beidou short message communication and design method |
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| CN101038979A (en) * | 2006-03-16 | 2007-09-19 | 中国科学院上海微系统与信息技术研究所 | Compensation type helix microstrip resonant unit and branch line coupler |
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| JPH0567904A (en) * | 1991-09-05 | 1993-03-19 | Matsushita Electric Ind Co Ltd | Distribution coupling type directional coupler |
| US20150042412A1 (en) * | 2013-08-07 | 2015-02-12 | Qualcomm Incorporated | Directional coupler circuit techniques |
| US9685687B2 (en) * | 2014-09-15 | 2017-06-20 | Infineon Technologies Ag | System and method for a directional coupler |
| JP6172479B2 (en) * | 2015-07-29 | 2017-08-02 | Tdk株式会社 | Directional coupler |
| CN105406161B (en) * | 2015-12-08 | 2018-07-17 | 大连海事大学 | A kind of degree of coupling it is adjustable and with restructural response across directional coupler |
| CN109818127B (en) * | 2019-03-26 | 2021-10-01 | 大连海事大学 | Phase continuously adjustable crossing directional coupler |
| CN110011020B (en) * | 2019-04-11 | 2021-12-03 | 上海剑桥科技股份有限公司 | PCB coupler |
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| CN101038979A (en) * | 2006-03-16 | 2007-09-19 | 中国科学院上海微系统与信息技术研究所 | Compensation type helix microstrip resonant unit and branch line coupler |
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