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Title: Cross- coupled YBCO BPFs with wide upper stopband using quarter-wavelength stepped-impedance resonators
Authors: Hsu, Chung-I G.;Wang, Li-Ming;Chen, Li-Shian;Lee, Ching-Her
Contributors: 電子工程學系
Date: 2007-04
Issue Date: 2012-05-29T01:21:44Z
Publisher: Physical Society of the Republic of China
Abstract: This paper presents a cross-coupled high-temperature superconducting (HTS) bandpass filter (BPF) design using quarter-wavelength stepped-impedance resonators (λ/4 SIRs) for the wireless communication applications. A pair of transmission zeros associated with the cross-coupled configuration is designed to be placed near the passband skirts, greatly sharpening the rolling-off at the passband edges. The spurious-passband center frequency of the BPF using λ/4 SIRs is simulated to be higher than that of the BPF adopting λ/2 SIRs. A BPF using λ/4 SIRs, conceived to be smaller than the corresponding BPF using λ/2 SIRs, has been fabricated by double-sided depositing patterned YBCO film on a 10-mm-square and 0.5-mm-thick LaAlO3 substrate and by putting them in a copper housing. The measured results revealed that this BPF has a very wide stopband bandwidth beyond the desired passband.
Relation: Chinese Journal of Phys., 45(2-II): 273-280
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