CN110677137A - Broadband miniaturization forward wave directional coupler circuit unit topological structure - Google Patents

Broadband miniaturization forward wave directional coupler circuit unit topological structure Download PDF

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Publication number
CN110677137A
CN110677137A CN201910902079.XA CN201910902079A CN110677137A CN 110677137 A CN110677137 A CN 110677137A CN 201910902079 A CN201910902079 A CN 201910902079A CN 110677137 A CN110677137 A CN 110677137A
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directional coupler
forward wave
topological structure
circuit unit
wave directional
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CN201910902079.XA
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CN110677137B (en
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于正永
易鑫
施永荣
张悦
乔琪
徐彤
朱东进
王可
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Huaian Vocational College of Information Technology
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Huaian Vocational College of Information Technology
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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
    • 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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  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)

Abstract

The invention discloses a topological structure of a circuit unit of a broadband miniaturized forward wave directional coupler. The forward wave directional coupler circuit unit topological structure is formed by connecting a plurality of inductors and capacitors in series and parallel, and has the structural characteristic of axial symmetry. The circuit unit topological structure of the forward wave directional coupler comprises a main circuit inductor L and a main circuit capacitor CsAnd main circuit capacitor CsShunt inductance LsAnd a shunt capacitor C connected in parallel to ground. The topological structure of the circuit unit of the forward wave directional coupler can increase and keep larger odd-even mode phase difference, and meanwhile, broadband impedance matching is achieved. The invention has the advantages of wide band and small size.

Description

Broadband miniaturization forward wave directional coupler circuit unit topological structure
Technical Field
The invention belongs to the technical field of passive microwave devices, and particularly relates to a topological structure of a circuit unit of a broadband miniaturized forward wave directional coupler.
Background
The directional coupler is a microwave device widely used in microwave systems, and essentially performs power distribution on signals in a certain frequency range according to a certain proportion, and can also be used for performing power synthesis.
Directional couplers have two coupling mechanisms: backward coupling and forward coupling. The backward coupling realizes the coupling of energy by using the difference of odd-even mode impedance under the condition of ensuring that the odd-even mode phase velocity is equal, and the backward coupling is generally used for weak coupling (the coupling degree is less than 10dB) because the impedance difference of two modes cannot be overlarge; the forward coupling realizes energy coupling by using the phase velocity difference of two modes under the condition of keeping the impedance of the odd-even mode characteristic equal, and compared with the backward coupling, the forward coupling can realize higher coupling degree (reaching 0dB under the ideal condition). From the aspect of implementation, the coupler mainly adopts Printed Circuit Boards (PCBs) and low temperature co-fired ceramics (LTCC) processes, and is designed around a transmission line theory, a Y-type multilayer structure and a defected ground structure, so as to implement broadband energy coupling and reduce electrical 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 new miniaturized coupler cell circuits. In view of the above, a miniaturized coupler with excellent performance can be designed based on an excellent circuit topology by using an advanced ipd (integrated Passive device) process. Therefore, designing a circuit unit topology of a broadband miniaturized directional coupler with excellent performance becomes a hot point of research 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 circuit unit topological structure of the forward wave directional coupler is composed of two main paths, a branch path of the main path and two bypasses from the main path to the ground, and the topological structure is about an axis MM1The upper and lower symmetry and the left and right symmetry about the branch. The forward wave directional coupler circuit unit is opened upThe flapping structure comprises 4 main circuit inductors L and 4 main circuit capacitors C s2 branch inductors LsAnd 2 bypass capacitors C;
further, a main circuit inductor L and a main circuit capacitor CsThe shunt capacitor C is connected in series and is connected to the ground in parallel, and a series resonance point is introduced under the excitation of an even mode;
further, a main circuit inductor L and a main circuit capacitor CsIn series, MM is excited in odd mode due to the axial symmetry of the whole topological structure1The point N is equivalent to a zero potential point, and the branch inductor L is at the momentsThe energy coupling capacitor can be equivalently connected to the ground together with the bypass capacitor C in parallel, so that series and parallel resonance points are simultaneously introduced under odd-mode excitation, the phase difference of odd and even modes is increased, and the energy coupling is realized;
compared with the prior directional coupler circuit, the broadband miniaturization forward wave directional coupler circuit unit topological structure provided by the invention has the following advantages:
1) the forward wave directional coupler circuit unit topological structure can increase the phase difference of odd-even modes in a broadband and has the advantage of miniaturization.
2) Through the cascade connection of 4 units, the topological structure of the forward wave directional coupler circuit unit realizes 0dB coupling in a 9.6-13GHz frequency band, the coupling relative bandwidth reaches 30.08%, and the forward wave directional coupler circuit unit has the advantage of broadband.
3) The forward wave directional coupler circuit unit topological structure reasonably adjusts the inductance LsL and a capacitor CsAnd C, realizing any odd-even mode phase difference, and finishing the design of any coupling degree through unit cascade.
4) The forward wave directional coupler circuit unit is novel and simple in topological structure and facilitates realization of a 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 an odd-mode operation schematic diagram of a circuit unit topology of the broadband miniaturized forward wave directional coupler according to the present invention.
Fig. 4 is a diagram of simulation results of a specific embodiment of the topology of the broadband miniaturized forward wave directional coupler circuit unit according to the present invention after cascading 4 units.
Detailed Description
The following describes an embodiment of a circuit unit topology of a broadband miniaturized forward wave directional coupler according to the present invention with reference to the accompanying drawings.
As shown in FIG. 1, the topology of the broadband miniaturized forward wave directional coupler circuit unit provided by the invention is composed of two main paths, a branch path of the main path and two bypass paths from the main path to the ground, and the topology is about an axis MM1The upper and lower symmetry and the left and right symmetry about the branch. The circuit unit topological structure of the forward wave directional coupler comprises 4 main circuit inductors L and 4 main circuit capacitors C s2 branch inductors LsAnd 2 bypass capacitors C. In the specific embodiment, the values of the circuit parameters are as follows: l ═ 0.8nH, Ls＝0.9nH，C＝0.4pF，Cs＝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 signal, and the axis symmetry line MM is used12 shunt inductances L which can be equivalent to ideal magnetic walls and are connected in parallelsCan be considered as an open circuit. At this time, the working principle diagram of the even mode is expressed as an LC high-pass resonance circuit, and a proper starting frequency f of the electric length of the even mode is introducedL，even。
Fig. 3 is an odd-mode operation schematic diagram of a circuit unit topology of the broadband miniaturized forward wave directional coupler according to the present invention. Under the excitation of odd mode, the circuit transmits odd mode signals, and the axis symmetry line MM is arranged at the moment1It can be equivalent to an ideal electrical wall, and the node N is equivalent to a zero potential point. At this time, the odd-mode working schematic diagram is expressed as a composite right/left-handed (CRLH) transmission line, wherein one resonance frequency point is a series resonance point f under the excitation of an even modeL，evenThe other parallel resonance point is set to fL，oddAnd the difference value of the two frequency points is utilized to increase the phase difference of odd-even modes, thereby realizing the energy coupling of the forward wave.
Fig. 4 is a simulation result of a specific embodiment of the circuit unit topology of the broadband miniaturized forward wave directional coupler according to the present invention after cascading 4 units. It can be seen that the coupling degree S is within the frequency band of 9.6-13GHz31Close to 0dB, through terminal S21And standing wave S11Are all less than-10 dB, isolate the terminal S41About-10 dB, the relative coupling bandwidth reaches 30.08%, the coupling degree is high (close to 0dB), and the miniaturization of the device is realized. Therefore, the forward wave directional coupler circuit unit topological structure has excellent performance.

Claims (4)

1. A broadband miniaturization forward directional wave directional coupler circuit unit topological structure is characterized in that: the broadband miniaturized forward wave directional coupler circuit unit topological structure is composed of two main paths, a branch path of the main path and two bypass paths from the main path to the ground, and the topological structure is about an axis MM1The upper and lower parts are symmetrical and the left and right parts are symmetrical about the branch; the circuit unit topological structure of the forward wave directional coupler comprises 4 main circuit inductors L and 4 main circuit capacitors Cs2 branch inductors LsAnd 2 bypass capacitors C.
2. A broadband miniaturized forward wave directional coupler circuit cell topology according to claim 1, characterized in that said two main paths are each formed by 2 main path inductors L and 2 main path capacitors CsAre formed in series.
3. A wideband miniaturized forward wave directional coupler circuit cell topology according to claim 1, characterized in that said one branch is passed through 2 series inductances LsConnecting the two main paths.
4. A wideband miniaturized forward wave directional coupler circuit cell topology according to claim 1, characterized in that the two stripsThe bypasses pass through the bypass capacitor C and the corresponding main circuit capacitor CsConnected in parallel and connected to ground in parallel.
CN201910902079.XA 2019-09-17 2019-09-17 Broadband miniaturized forward wave directional coupler circuit unit topological structure Active CN110677137B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114865265A (en) * 2022-06-14 2022-08-05 江南大学 Broadband low-loss directional coupler and frequency modulation transmitter system

Citations (4)

* Cited by examiner, † Cited by third party
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114865265A (en) * 2022-06-14 2022-08-05 江南大学 Broadband low-loss directional coupler and frequency modulation transmitter system
CN114865265B (en) * 2022-06-14 2023-02-21 江南大学 Broadband low-loss directional coupler and frequency modulation transmitter system

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Denomination of invention: A Topological Structure of Broadband Miniaturized Forward Wave Directional Coupler Circuit Unit

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