Open AccessCompact and high‐selectivity microstrip bandpass filter using two‐stage twist‐modified asymmetric split‐ring resonators
Author(s) -
Li Jian,
Huang Yongjun,
Wen Guangjun,
Xue Xiaolin,
Song Jiaming
Publication year - 2015
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2014.3988
Subject(s) - passband , band pass filter , resonator , microstrip , materials science , filter (signal processing) , prototype filter , microwave , elliptic filter , electronic engineering , physics , optoelectronics , low pass filter , optics , telecommunications , electrical engineering , computer science , engineering
A compact and high frequency selectivity two‐stage microstrip bandpass filter is designed and experimentally demonstrated. Such a kind of filter is composed of two pairs of twist‐modified asymmetric split‐ring resonators (SRRs) to achieve three transmission poles within the passband and four transmission zeros at low and high rejection bands. Sharply out‐of‐band reductions contributing to the high frequency selectivity are obtained by properly detuning the gaps among the SRRs. The measured results show that the proposed filter with dimensions of 0.088 × 0.088 λ 2 has a 3 dB passband of 15.2% centred at 1.98 GHz. This filter can be flexibly integrated in miniaturised radio‐frequency/microwave circuits.