A method of reducing insertion loss for microstrip filters

Abstract

Based on the theory of multiple coupled-resonator filter, coupling matrix and microstrip square open loop resonator,  this paper studies a method of designing bandpass microstrip filter in order to reduce insertion loss. The results of simulation on ADS software and measurement on vector network analysis machine of a sample of designed filter showed that the method can reduce insertion loss which compare to other common microstrip filters. The method can be completely used to design microstrip filters with low insertion loss and high selectivity, applying for wireless systems.