TRI-SECTION STEPPED-IMPEDANCE BANDPASS FILTER WITH WIDE STOPBAND PERFORMANCE

摘要

In this paper, a compact microstrip bandpass filter with wide stopband performance is presented. Wide stopband performance is achieved by introducing both stepped-impedance resonator and over-coupling technique. With the new structure, the filter has not only wide upper stopband performance with harmonic frequency outside 5f0 but also compact size.