Compact Microstrip Lowpass Filter With Ultra-Wide Stopband Using a Modified Circular Resonator

摘要

A compact microstrip lotvpass filter (LPF) employing modified circular resonant patches and folded lines has a sharp rolloff, an ultra-wide stopband from 4.5 to 32 GHz with 26.2 dB attenuation and insertion loss of less than 0.12 dB.