Compact Wideband Microstrip Parallel-coupled Line Band-pass Filter With Complementary Electric Field Coupled Resonators

Abstract

A new resonator which is composed of the cross resonator and the complementary electric coupled-field resonator is proposed. By using the coupled feeding mode, a compact wideband parallel-coupled line band-pass filter with the proposed resonator is presented. The proposed wideband band-pass filter has been simulated, fabricated and measured. It has two transmission zeros outside the pass-band, which improves the selectivity of the proposed wideband band-pass filter. 3 dB bandwidth is 1.81 GHz from 4.07 GHz to 5.88 GHz.