A Dual Mode BPF with Improved Spurious Response Using DGS Cells Embedded on the Ground Plane of CPW

Min-Hang WENG
Chang-Sin YE
Cheng-Yuan HUNG
Chun-Yueh HUANG

IEICE TRANSACTIONS on Electronics   Vol.E91-C    No.2    pp.224-227
Publication Date: 2008/02/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e91-c.2.224
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Microwaves, Millimeter-Waves
bandpass filter (BPF),  coplanar-waveguide (CPW),  dual-mode resonator,  rejection,  spurious response,  defected ground structure (DGS),  

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A novel dual mode bandpass filter (BPF) with improved spurious response is presented in this letter. To obtain low insertion loss, the coupling structure using the dual mode resonator and the feeding scheme using coplanar-waveguide (CPW) are constructed on the two sides of a dielectric substrate. A defected ground structure (DGS) is designed on the ground plane of the CPW to achieve the goal of spurious suppression of the filter. The filter has been investigated numerically and experimentally. Measured results show a good agreement with the simulated analysis.