An Inverse S-Shaped Slotted Ground Structure Applied to Miniature Wide Stopband Lowpass Filters

Min-Hang WENG  Yu-Chi CHANG  Hung-Wei WU  Chun-Yueh HUANG  Yan-Kuin SU  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E90-C   No.12   pp.2285-2288
Publication Date: 2007/12/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e90-c.12.2285
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Microwaves, Millimeter-Waves
Keyword: 
slotted ground structure (SGS),  lowpass,  filter,  miniaturized,  stopband,  

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Summary: 
In this paper, an inverse S-shaped slotted ground structure (S-SGS) is proposed and analyzed. The S-SGS generates dual attenuation poles that can be easily controlled by its structure parameters. The equivalent circuit of the S-SGS consists of lumped elements that can be extracted from the measured S parameters. Moreover, several S-SGS cells are applied to form a miniaturized lowpass filter (LPF), which has a smaller area and a wider stopband in comparison to previous works.