Open AccessHigh temperature superconducting filter with linear phase on LaAlO3 substrates
Author(s) -
Tao Zuo,
Xinjie Zhao,
Xiaokun Wang,
Hongwei Yue,
Fang Lan,
Yan Shao-lin
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.4194
Subject(s) - passband , filter (signal processing) , resonator , spurious relationship , linear phase , materials science , group delay and phase delay , phase (matter) , band pass filter , superconductivity , return loss , prototype filter , band stop filter , low pass filter , physics , optoelectronics , optics , condensed matter physics , computer science , telecommunications , quantum mechanics , machine learning , antenna (radio) , computer vision
A linear phase high temperature superconducting HTS filter fabricated on LaAlO3 substrates is presented. The designed passband of the HTS filter is 10 MHz and the group delay ripples over 80% of the passband is less than 20 ns. The filter consists of novel resonators, which are able to minimize the spurious couplings between resonators. As a result, the filter shows not only the linear phase characteristic but also the symmetrical frequency response. The measured passband is 9.85 MHz. The return loss is better than 16 dB and the out-of -band rejection is better than 80 dB. The measured group delay ripples is about 20 ns, which is in good agreement with the simulated result.