Synthesis and Design of Compact Microwave Filters with Direct Source-Load Coupling

Abstract

This paper presents a method for synthesizing microwave filters with source-load coupling. The equivalent circuit of the low-pass prototype of a general lossless coupled resonator filter is proposed, and the corresponding transfer function t(s) is derived. Then, a microstrip filter with source-load coupling is designed and fabricated. The measured and simulated data are in good agreement.