Synthesis of a high-performance ultra-wideband bandpass filter

An Ultra-wideband bandpass filter (BPF) prototype consisting of SIRs and short-circuited stubs with Chebyshev characteristics is proposed. As an example, a UWB filter(3.1~10.6GHz) with an FBW of 110% is synthesized based on the microstrip line. The circuit parameters and corresponding geometrical dimensions are worked out and confirmed by a microwave circuit/EM simulator. The good agreement between the simulated and theoretical results validates the effectiveness of newly-proposed theory.