Improvement in radiation losses of spur line resonators based LPF on an EBG substrate

Abstract

Filters have always remained a field of immense interest in the high frequency domain. Emerging applications such as wireless communications continue to challenge RF/microwave filters with ever more stringent requirements-high performance, smaller size, lightweight, and lower cost. In this paper we propose and investigate the application of Electromagnetic Bandgap (EBG) structures for improving the performance of a stub type 5 pole Low Pass Filter with spur line resonators. Whereas the spur line resonators, improve the roll off factor significantly from −22.666 dB/GHz to −38.0893 dB/GHz, the effect of the EBG is evident in reducing the radiation losses of the spur line resonators and getting almost the same return loss and roll off factor.