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Meta‐grounded bandpass filter with broad upper‐stopband
Author(s) -
Xu Mingming,
Qiao Haidong,
Yu Weihua,
He Changshan
Publication year - 2021
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.32781
Subject(s) - stopband , band pass filter , elliptic filter , filter (signal processing) , resonator , electronic filter topology , acoustics , materials science , electronic engineering , engineering , band stop filter , low pass filter , prototype filter , optoelectronics , physics , electrical engineering
In this paper, a novel meta‐grounded planar bandpass filter is presented, facilitating much broader upper stopband. The proposed filter is comprised of a strip layer on the top, a dielectric laminate in the middle and a meta‐grounding layer on the bottom. The strip on the top consists of three cross‐shaped resonators in cascade. Instead of perfect conducting ground, a meta‐ground, composed by a group of metallic mushroom lattices with different characteristic dimensions, is proposed for broadening the upper stopband. In order to validate the proposed concept, we design and fabricate a prototype filter with a center frequency of 11.6 GHz, which exhibits an extremely broad upper stopband from 17.6 GHz to 72.2 GHz with a rejection level greater than 20 dB.
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