Spurious Suppression of a Parallel Coupled Microstrip Bandpass Filter with Simple Ring EBG Cells on the Middle Layer

Hung-Wei WU  Min-Hang WENG  Yan-Kuin SU  Ru-Yuan YANG  Cheng-Yuan HUNG  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E89-C   No.4   pp.568-570
Publication Date: 2006/04/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e89-c.4.568
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Microwaves, Millimeter-Waves
Keyword: 
electromagnetic bandgap (EBG),  bandpass filter (BPF),  spurious,  suppression,  

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Summary: 
This paper proposes a parallel coupled microstrip bandpass filter (BPF) with ring Electromagnetic Bandgap (EBG) cells on the middle layer for spurious suppression. The ring EBG cells of the middle layer add a good stopband-rejection mode to the second harmonics of the parallel coupled microstrip BPF with suppression of over -50 dB, without affecting the center frequency and insertion loss of the original designed BPF. The design of ring EBG cells is presented and verified by the experimented results.