High Spurious Suppression of the Dual-Mode Patch Bandpass Filter Using Defected Ground Structure

Min Hung WENG
Hung Wei WU
Ru Yuan YANG
Tsung Hui HUANG
Mau-Phon HOUNG

IEICE TRANSACTIONS on Electronics   Vol.E87-C    No.10    pp.1738-1740
Publication Date: 2004/10/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Microwaves, Millimeter-Waves
dual-mode,  bandpass filter,  defect ground structure (DGS),  harmonic,  

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This investigation proposes a novel dual-mode patch bandpass filter (BPF) that uses defect ground structure (DGS) to suppress spurious response. The proposed dual-mode patch BPF has exhibits a wide stopband characteristic owing to that uses the bandgap resonant characteristic of DGS in the harmonic frequency of the dual-mode patch BPF. The novel proposed filter demonstrates the frequency characteristics with center frequency f0 = 2.2 GHz, 3-dB bandwidth (FBW) of 8% and wider stopband from 2.6 to 6 GHz at the level of -35 dB. The experimental and simulated results agree.