CN110677137B - Broadband miniaturized forward wave directional coupler circuit unit topological structure - Google Patents
Broadband miniaturized forward wave directional coupler circuit unit topological structure Download PDFInfo
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- CN110677137B CN110677137B CN201910902079.XA CN201910902079A CN110677137B CN 110677137 B CN110677137 B CN 110677137B CN 201910902079 A CN201910902079 A CN 201910902079A CN 110677137 B CN110677137 B CN 110677137B
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- 238000010586 diagram Methods 0.000 description 8
- 230000005284 excitation Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 4
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/46—Networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a broadband miniaturized forward wave directional coupler circuit unit topological structure. The forward wave directional coupler circuit unit topological structure is formed byThe dry inductors and the dry capacitors are formed in a serial-parallel connection mode and have axisymmetric structural characteristics. The topological structure of the forward wave directional coupler circuit unit comprises a main circuit inductance L and a main circuit capacitance C s And main circuit capacitor C s Parallel branch inductance L s And a shunt capacitance C connected in parallel to ground. The forward wave directional coupler circuit unit topological structure can increase and maintain larger odd-even mode phase difference and realize broadband impedance matching. The invention has the advantages of wide band and small size.
Description
Technical Field
The invention belongs to the technical field of passive microwave devices, and particularly relates to a circuit unit topological structure of a broadband miniaturized forward wave directional coupler.
Background
The directional coupler is a microwave device widely applied in a microwave system, and is essentially used for distributing power to signals in a certain frequency range according to a certain proportion and simultaneously can also be used for power synthesis.
Directional couplers have two coupling mechanisms: backward coupling and forward coupling. The backward coupling realizes the coupling of energy by utilizing the difference of the odd-even mode impedance under the condition of ensuring the equal odd-even mode phase velocity, and is generally used for weak coupling (the coupling degree is less than 10 dB) because the difference of the two mode impedance cannot be too large; the forward coupling is to use the phase velocity difference between two modes to realize energy coupling under the condition of keeping the characteristic impedance of the odd-even mode equal, and compared with the backward coupling, the forward coupling can realize higher coupling degree (the ideal condition can reach 0 dB). From the implementation, the coupler mainly adopts a circuit board printing (PCB, printed circuit boards) process and a low temperature co-fired ceramic (LTCC, low temperature co-fiber) process, and is designed around transmission line theory, a Y-type multi-layer structure and a defected ground structure to realize broadband energy coupling and reduce the electric size. However, the coupler designed based on the above method has a problem of large circuit size in practical application. Therefore, there is a need to further design a new miniaturized coupler cell circuit. For this, an advanced IPD (Integrated Passive Device) process is adopted, and based on an excellent circuit topology structure, a miniaturized coupler with excellent performance can be designed. Therefore, a broadband miniaturized directional coupler circuit unit topology excellent in design performance has become a research hot spot in recent years.
Disclosure of Invention
The invention aims to provide a broadband miniaturized forward wave directional coupler circuit unit topological structure, which realizes higher coupling degree and reduces the circuit size.
The technical scheme of the invention is as follows:
the topological structure of the forward wave directional coupler circuit unit consists of two main paths, one branch of the interconnection of the main paths and two bypasses of the main paths to the ground, and the topological structure is about an axis MM 1 Is symmetrical up and down and is symmetrical left and right about the branch. The topological structure of the forward wave directional coupler circuit unit comprises 4 main path inductances L and 4 main path capacitances C s Inductance L of 2 branches s And 2 bypass capacitances C;
further, a main circuit inductance L and a main circuit capacitance C s The series connection is carried out, and the parallel connection is connected to the ground through a bypass capacitor C, so that a series resonance point is introduced under the excitation of an even mode;
further, a main circuit inductance L and a main circuit capacitance C s In series, the whole topological structure has axisymmetric structural characteristics, and under odd mode excitation, the MM 1 The junction can be regarded as an ideal electric wall, the node N is equivalent to a zero potential point, and the branch inductance L s The parallel connection of the parallel connection capacitor C and the bypass capacitor C can be equivalently realized, so that series resonance points and parallel resonance points are simultaneously introduced under odd mode excitation, the odd-even mode phase difference is increased, and energy coupling is realized;
compared with the existing directional coupler circuit, the topological structure of the broadband miniaturized forward wave directional coupler circuit unit provided by the invention has the following advantages:
1) The topological structure of the forward wave directional coupler circuit unit can increase the odd-even mode phase difference in a broadband and has the advantage of miniaturization.
2) Through cascade connection of 4 units, the topological structure of the forward wave directional coupler circuit unit realizes 0dB coupling in the frequency band of 9.6-13GHz, the coupling relative bandwidth reaches 30.08%, and the forward wave directional coupler circuit has the advantage of broadband.
3) The topological structure of the forward wave directional coupler circuit unit is realized by reasonably adjusting the inductance L s L and capacitor C s C, realizing any odd-even mode phase difference, and completing the design of any coupling degree through unit cascade.
4) The forward wave directional coupler circuit unit has novel and simple topological structure, and is convenient for realizing the circuit topological structure in practical application.
Drawings
Fig. 1 is a schematic diagram of a circuit unit topology of a broadband miniaturized forward wave directional coupler according to the present invention.
Fig. 2 is a schematic diagram of the even mode operation of the topology structure of the broadband miniaturized forward wave directional coupler circuit unit according to the present invention.
Fig. 3 is a schematic diagram of the odd mode operation of the topology structure of the broadband miniaturized forward wave directional coupler circuit unit according to the present invention.
Fig. 4 is a diagram of simulation results of a specific embodiment after 4 units are cascaded in a topology structure of a broadband miniaturized forward wave directional coupler circuit unit according to the present invention.
Detailed Description
The following describes a specific embodiment of a circuit unit topology structure of a broadband miniaturized forward wave directional coupler provided by the invention with reference to the accompanying drawings.
As shown in FIG. 1, the topology structure of the broadband miniaturized forward wave directional coupler circuit unit provided by the invention is composed of two main paths, one branch of the main paths which are interconnected and two bypasses of the main paths to the ground, and the topology is about an axis MM 1 Is symmetrical up and down and is symmetrical left and right about the branch. The topological structure of the forward wave directional coupler circuit unit comprises 4 main path inductances L and 4 main path capacitances C s Inductance L of 2 branches s And 2 bypass capacitances C. The circuit parameter values in the specific embodiment are as follows: l=0.8nh, L s ＝0.9nH，C＝0.4pF，C s ＝1.0pF。
Fig. 2 is a schematic diagram of the even mode operation of the topology structure of the broadband miniaturized forward wave directional coupler circuit unit according to the present invention. Under the excitation of even mode, the circuit transmits even mode signals, and the axisymmetric line MM is at the moment 1 Can be equivalent to an ideal magnetic wall, and is connected with 2 branch inductances L in parallel s Can be considered as an open circuit. At this time, the even mode working principle diagram is expressed as an LC high-pass resonant circuit, and a proper even mode electric length starting frequency f is introduced L，even 。
Fig. 3 is a schematic diagram of the odd mode operation of the topology structure of the broadband miniaturized forward wave directional coupler circuit unit according to the present invention. Under odd mode excitation, an odd mode signal is transmitted in the circuit, and the axisymmetric line MM is used for the moment 1 Can be equivalently an ideal electric wall, and the node N is equivalently a zero potential point. At this time, the odd mode working principle diagram is represented as a composite right/left-handed (CRLH) transmission line, wherein one resonance frequency point is a series resonance point f under even mode excitation L，even Another parallel resonance point is set to f L，odd The difference value of the two frequency points is utilized to increase the odd-even mode phase difference, so that the forward wave energy coupling is realized.
Fig. 4 is a simulation result of a specific embodiment after 4 units are cascaded by using the topology structure of the broadband miniaturized forward wave directional coupler circuit unit. It can be seen that the coupling degree S is within the frequency band of 9.6-13GHz 31 Near 0dB, straight-through end S 21 And standing wave S 11 Are smaller than-10 dB, and the isolation end S 41 About-10 dB, the coupling relative bandwidth reaches 30.08%, the coupling degree is higher (approaching 0 dB), and the miniaturization of the device is realized. Therefore, the forward wave directional coupler circuit unit has excellent topological structure performance.
Claims (1)
1. A broadband miniaturized forward wave directional coupler circuit unit topological structure is characterized in that: the topological structure of the broadband miniaturized forward wave directional coupler circuit unit consists of two main partsOne branch of the interconnection of the road and the main road and two bypasses of the main road to the ground, the topological structure is about the shaft MM 1 Is symmetrical up and down and is symmetrical left and right about the branch; the topological structure of the forward wave directional coupler circuit unit comprises 4 main path inductances L and 4 main path capacitances C s Inductance L of 2 branches s And 2 bypass capacitances C; the two main circuits are respectively 2 main circuit inductances L and 2 main circuit capacitances C s Formed in series; one branch is connected with the inductor L in series through 2 s Two main paths are connected; the two bypasses are connected with the corresponding main circuit capacitor C through the bypass capacitor C s Connected in parallel and connected in parallel to ground.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102569972A (en) * | 2010-12-17 | 2012-07-11 | 成都飞机工业（集团）有限责任公司 | Method for improving performance indexes of directional coupler |
| CN104505571A (en) * | 2014-12-15 | 2015-04-08 | 电子科技大学 | Over-mode circular waveguide broadband directional coupler and design method thereof |
| CN108011169A (en) * | 2017-12-01 | 2018-05-08 | 电子科技大学 | Circular waveguide is to rectangular waveguide dual mode wideband directional coupler |
| CN108172962A (en) * | 2017-12-21 | 2018-06-15 | 电子科技大学 | A kind of broadband circular waveguide directional coupler for microwave power measurement |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102569972A (en) * | 2010-12-17 | 2012-07-11 | 成都飞机工业（集团）有限责任公司 | Method for improving performance indexes of directional coupler |
| CN104505571A (en) * | 2014-12-15 | 2015-04-08 | 电子科技大学 | Over-mode circular waveguide broadband directional coupler and design method thereof |
| CN108011169A (en) * | 2017-12-01 | 2018-05-08 | 电子科技大学 | Circular waveguide is to rectangular waveguide dual mode wideband directional coupler |
| CN108172962A (en) * | 2017-12-21 | 2018-06-15 | 电子科技大学 | A kind of broadband circular waveguide directional coupler for microwave power measurement |
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Address after: 223005 No.3, Meicheng East Road, Huai'an City, Jiangsu Province Applicant after: Jiangsu electronic information Vocational College Address before: 223005 No.3, Meicheng East Road, Huai'an City, Jiangsu Province Applicant before: Jiangsu vocationnal college of electronics and information |
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Application publication date: 20200110 Assignee: Jiangsu Zhongzhou Technology Co.,Ltd. Assignor: Jiangsu electronic information Vocational College Contract record no.: X2023980043291 Denomination of invention: A Topological Structure of Broadband Miniaturized Forward Wave Directional Coupler Circuit Unit Granted publication date: 20230623 License type: Common License Record date: 20231013 |
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