Improvement of Compactness of Lowpass/Bandpass Filter Using a New Electromagnetic Coupled Crescent Defected Ground Structure Resonators

摘要

This paper introduces a new compact defected ground structure (DGS) low pass filter (LPF) using a crescent shape structure etched in the ground plane. The filter response has improved dramatically by employing coupling of two DGS structures. Furthermore, the transformation to bandpass filter (BPF) is also investigated. The proposed configuration improved the lowpass response by widening the rejection band while significantly reducing the size. The behaviour of the filter has been investigated using HFSS as well as lumped element equivalent circuit model simulations using parallel L-C resonator. The proposed filter has been optimized.