Compact microstrip lowpass filter with sharp roll-off and ultra-wide stop-band

Abstract

A compact microstrip lowpass filter (LPF) with sharp roll-off and ultrawide stop-band bandwidth is presented. The structure consists of highimpedance meandered transmission lines loaded by triangular and polygonal resonant patches. The cutoff frequency of the proposed LPF is 2.44 GHz and the measured results show good performance such as sharp roll-off, good insertion loss and an ultra-wide stopband from 2.53 to 35 GHz with the insertion-loss higher than 20 dB. There is a good agreement between the electromagnetic-simulation and measurement results. © The Institution of Engineering and Technology 2013.