The Design Technique for Coaxial Resonator Cavity Duplexer

Abstract

Abstract-A general design technique for the coaxial resonator cavity duplexer is proposed in this paper, based on the design method of the general Chebyshev band-pass filter. We can obtain the coupling matrixes of cross-coupled resonator duplexer by optimization technique, and complete the design of duplexer fast. The proposed duplexer is designed and fabricated with the 1.92-1.98 GHz downlink and 2.11-2.17 GHz uplink frequencies. Across the bandwidth, the measured insertion losses at the both bands are less than 1 dB, while the input and output return losses are well below 20 dB. More than 50 dB isolation performance is obtained from the duplexer. The measured results approximately meet all the conditions of the design targets.

Concept Design of Spraying System Based on Function Analysis of Spraying Robots

“…It needs to meet the requirement of farmland drug spraying as well as to be equipped walking system. Therefore, spraying robot could be separated into two individual system modules: self-propelled walking system, which makes the robot walk through the working fields; target spraying system, which realizes target sensor and spraying function [1][2]. Generally, these two parts cannot be required to be correlated strictly, but just need to match the working rate of each other.…”

A 2.45 GHZ Reentarnt Coaxial Cavity for Liguid Sterilization Based on Non-Thermal Microwave Effect

“…The coaxial cavity structure with high field intensity has been researched [16,17], but there are few reports about using this structure to sterilize for liquid, because the electric field is too high and because the dielectric constants are much different from air. Here we report a modified microwave coaxial cavity resonator.…”