Development and Design of Planar Microwave Ring Filter

Abstract

Modern wireless communication system has lead to an increased demand for the products that are higher efficiency, smaller size, and lower cost. Many circuits have continued development, especially, microwave bandpass filters and passive devices. With the advantages of ring resonator filter, the low insertion loss and practically implementation can be obtained. This research is thus proposed and designed the ring resonator filter under multi-mode operation for an ultra-wideband application. Also, an analytical technique based on two-port theory is used to analyze the scattering parameter and transmission zero location where the evenand -odd mode is applied to examine the resonance frequencies. The measured results show good agreement with the simulated results.