Open AccessCompact superconducting lowpass filter with wide stopband
Author(s) -
Jiang Ying,
Wei Bin,
Heng Yong,
Guo Xubo,
Cao Bisong,
Jiang Linan
Publication year - 2017
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.2017.0429
Subject(s) - stopband , passband , bandwidth (computing) , low pass filter , elliptic filter , transition band , attenuation , materials science , insertion loss , high pass filter , band pass filter , optoelectronics , prototype filter , optics , physics , computer science , telecommunications , resonator
A compact superconducting lowpass filter (LPF) composed of a pair of symmetrical parallel coupled lines, a cross‐shaped patch and a modified E‐type feeding structure is proposed. The filter is successfully designed and fabricated on MgO substrate with a compact size of 10.0 × 15.0 mm. Measured results match well with simulation results. The LPF has a 3 dB cut‐off frequency of 2.18 GHz, relative stopband bandwidth of 160%, and 0.06 dB insertion loss in the passband. For attenuation level of −18.5 dB, stopband bandwidth is from 3.16 to 19.25 GHz.