Design and Optimization of a Compact Microstrip Bandpass Filter Using on Open Loop Rectangular Resonators for Wireless Communication Systems

This article describes the design of a compact band-pass filter with two identical rectangular open loop resonators for a frequency of 3.5 GHz. The proposed filter frequency response covers the 3.5 GHz global interoperability for microwave access (WiMAX). This filter’s structure uses the Rogers RO6010 substrate, which has a dielectric constant of 10.2, a thickness of 1.27 mm, and a tangent loss of 0.0023. The proposed device is intended for wireless communication systems operating at the 3.5 GHz resonance frequency. This bandwidth has a very high activity in the 1.21 GHz band, a small size of (5.72 * 12.34) mm2 and a low insertion loss of − 0.16 dB.