Duplexer Based on Composite Left and Right Handed Resonator Loaded by Short Circuit Stub

Abstract

A diplexer based on a short-circuit branch loaded type left and right handed composite resonators relates to transmitting and receiving diplexers. The diplexer includes an upper-layer microstrip structure, an intermediate-layer dielectric substrate and a bottom-layer grounding plate; the upper-layer microstrip structure comprises three input-output feed lines, the short-circuit branch loaded type left and right handed composite resonators of first and second channels, coupling lines distributed near the upper half cycle of the short-circuit branch loaded type left and right handed composite resonators of first and second channels respectively, and a square grounding patch in the terminals of the coupling lines; gaps exit between the coupling lines and the short-circuit branch loaded type left and right handed composite resonators, and the coupling lines are connected to the bottom-layer grounding plate via the square grounding patch at a center position over the short-circuit branch loaded type left and right handed composite resonators; one end of each feed line is connected with the coupling line and form a right-angle structure, and the other end of the feed line is connected to an internal conductor of a coaxial cable; and the upper and lower surfaces of the intermediate-layer dielectric substrate cling to the upper-layer microstrip structure and the bottom-layer grounding plate respectively, the bottom-layer grounding plate covers the lower surface of the intermediate-layer dielectric substrate, and the bottom-layer grounding plate is connected to the external conductor of the coaxial cable.

Description

technical field [0001] The invention relates to a duplexer for sending and receiving for communication, in particular to a duplexer based on a short-circuit stub-loaded composite left and right hand resonator. Background technique [0002] Since David Smith produced the first left-handed material by using space-periodically arranged metal wires and split-ring resonators in 2000, the left-handed material, which used to exist only in theoretical analysis, has entered the public eye and has been widely used in the fields of science and technology and engineering. Unprecedented attention, however, its shortcomings such as large volume, narrow bandwidth, and large loss limit its application in microwave engineering. However, people's enthusiasm for left-handed materials has not diminished. The research team led by Eleftheriades and the research team led by T.Itoh and C.Caloz respectively proposed a planar non-resonant method of periodically loading lumped and distributed shunt in...

AI Technical Summary

Problems solved by technology

In order to comply with this development trend, researchers in the microwave field have proposed a variety of compact structure duplexers, such as: spiral structure, folded structure, etc., on the premise of satisfying the target filtering characteristics, and even proposed some new It is hoped to achieve miniaturization to the greatest extent, but the limitations of the manufacturing process and its own structure still limit the application of these duplexers

Images