Sharp roll‐off lowpass filter using interdigital DGS slot | Zendy

Liu Shuai | Zendy; Xu Jun | Zendy; Xu Zhitao | Zendy

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Sharp roll‐off lowpass filter using interdigital DGS slot

Author(s) -

Liu Shuai,

Xu Jun,

Xu Zhitao

Publication year - 2015

Publication title -

electronics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.375

H-Index - 146

eISSN - 1350-911X

pISSN - 0013-5194

DOI - 10.1049/el.2015.0721

Subject(s) - stopband , low pass filter , transition band , cutoff frequency , ground plane , filter (signal processing) , materials science , acoustics , physics , band pass filter , prototype filter , optoelectronics , computer science , optics , engineering , electrical engineering , telecommunications , antenna (radio)

A novel lowpass filter (LPF) with a sharp roll‐off and a wide stopband is presented. The proposed LPF is based on a dual‐plane structure with an interdigital shape defected ground structure (DGS). The DGS exhibits a sharp roll‐off and three transmission zeros. By tuning the length of the fingers, the resonant frequency can be easily changed. Based on the proposed DGS, a LPF has been designed, fabricated and measured. The transition band is from 3.11 ( f c ) to 3.23 GHz with −3.02 and −22.5 dB, respectively. The stopband with rejection better than 25 dB can be extended to 3.4 f c .

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