Quasi-Lumped Design of Bandpass Filter Using CPW and Microstrip

[[abstract]]A bandpass �lter (BPF) using CPW combined with microstrip is proposed. The target BPF is composed of two element �lters built from combined CPW and microstrip structure. The design of element �lter is based on the lumped elements approach with each circuit component built from a CPW or microstrip. In the circuit model, transmission zeros are created by the passband edges to enhance the signal selectivity. The element �lter's characteristics are analyzed by the lumped L-C circuit model. Experiment is conducted, and a good agreement is observed between the measurement and simulation