Novel coupling network based planar CQ diplexer

A matching network and duplexer technology, applied to waveguide devices, electrical components, circuits, etc., can solve the problems of difficult tuning, large volume, large insertion loss, etc., and achieve low manufacturing cost, improved selectivity, and simple structure Effect

CN106058391AInactive Publication Date: 2016-10-26SOUTH CHINA UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2016-10-26
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a microstrip aided and novel coupling network based planar CQ diplexer, which comprises a band-pass filter with symmetrical CQ structures at left and right and a new coupling network. The planar CQ diplexer proposed by the invention has a novel coupling network structure and can be widely used in the design of various types of duplexers. With the adoption of a filter with a compact CQ structure, it is possible not only to make a diplexer highly selective, but also to ensure good isolation. As the duplexer is designed with a microstrip structure, it is light in weight, low in cost, and suitable for industrial mass production. Therefore, the duplexer is advantageous for its simple structure, easy design, and low manufacturing cost.
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Description

technical field

[0001] The invention relates to the technical field of a duplexer in the form of a microstrip line, in particular to a planar CQ duplexer based on a novel matching network. Background technique

[0002] With the rapid development of wireless communication, the frequency resources are becoming increasingly tight. As an important part of the wireless communication system, the performance of the duplexer directly affects the quality of the communication system. Commonly used duplexers in the communication field are:

[0003] 1. Waveguide duplexer: This kind of duplexer has been used for the longest time and is the most mature. It has low loss and high operating frequency, but it is large in size, high in cost and difficult to tune.

[0004] 2. Coaxial duplexer: a coaxial duplexer that uses air as the medium and silver-plated inner and outer conductors has very small dielectric loss and ohmic loss, high stability and good shielding, but in the mobile communicati...

Examples

Embodiment

[0037] This embodiment discloses a planar CQ duplexer based on a novel matching network such as Figure 4 As shown, the microstrip duplexer is fabricated on a double-sided copper-clad microstrip board 1 in the form of a printed circuit board, and the other side of the microstrip board is a copper-clad ground plane. In the structure diagram of the duplexer in the present invention.

[0038] A planar CQ duplexer based on a novel matching network, fabricated on a dielectric substrate 1 in the form of a printed circuit board,

[0039] On the same surface of the dielectric substrate, a first input end feeder P1 for inputting electromagnetic wave signals, a first output end feeder P2 and a second output end feeder P3 for outputting electromagnetic wave signals, and the second output end feeder P3 are respectively fabricated. The first input port feeder 2 of the CQ structure on the left, the second input port feeder 3 of the CQ structure on the right, and the short-circuit transmissio...