Fabrication of an X-Band Dual Mode Bandpass Filter Using Low Cost FR4 Substrate

Min-Hung WENG  Cheng-Yuan HUNG  Hung-Wei WU  

IEICE TRANSACTIONS on Electronics   Vol.E88-C    No.1    pp.143-145
Publication Date: 2005/01/01
Online ISSN: 
DOI: 10.1093/ietele/e88-c.1.143
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Microwaves, Millimeter-Waves
dual-mode,  transmission zero,  ring resonator,  FR4,  

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The investigation presents a low cost and low insertion loss X-band dual mode bandpass filter (BPF) based on inexpensive commercial FR4 substrate. The proposed filter at a central frequency f0 of 11.3 GHz has high filter performance filter with a fractional bandwidth of 14%, the insertion loss of -2.7 dB, and two transmission zeros. The designed procedures are presented in this letter and the fabricated filter verifies the proposed designed concept.