Design and Improvement of a Compact Bandpass Filter using DGS Technique for WLAN and WiMAX Applications
Abstract: In this article, A
compact size band pass filter based on octagonal resonators is presented to
give sharp response at desired frequency bands along with very low insertion
loss. The proposed filter structure is composed of octagonal microstrip
resonators, backed by Quasi-Yagi slots ‘Quasi-Yagi Defected Ground Structure’
(Quasi-Yagi-DGS). By controlling the electrical coupling between the
octagonal–strip and the Quasi-Yagi-DGS, the bandpass filter’s stopband is
optimized for better rejection. The proposed BPF has low insertion loss and
compact size because of the slow-wave effect. Meanwhile, sharp rejection bands induced
by the presence of two transmission zeros. The simulated center frequency and
passband insertion loss are 2.4 GHz and 0.6 dB, respectively.
Keywords: Bandpass filter
(BPF), Quasi-Yagi Defected Ground Structure (Quasi-Yagi-DGS), Octagonal resonator,
Compactness
Author: Ahmed Boutejdar
Journal Code: jptkomputergg170041
