Novel coupling network based planar CQ diplexer

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.

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...

AI Technical Summary

Problems solved by technology

[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 communication frequency domain, its size still seems too big

[0005] 3. Dielectric duplexer: It realizes the miniaturization of the duplexer, but it is not widely used in the communication field due to the high cost

[0006] 4. SAW duplexer: This kind of duplexer has been widely used in the field of communication because it can achieve frequency characteristics with arbitrary precision, and has the advantages of small size, good design flexibility, and high reliability. The disadvantage is the cost High, and the insertion loss is large, and the high-frequency withstand power is low, so it is suitable for mobile communication terminals with high miniaturization requirements

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