Design of a moderate‐wideband superconducting filter with modified stub structure. Issue 4 (8th December 2017)

• Record Type: Journal Article
• Authors: Lu, Xinxiang; Guo, Xubo; Heng, Yong; Luo, Chenjie; Wei, Bin; Zhang, Liuwan; Cao, Bisong
• Is Part Of: International journal of RF and microwave computer-aided engineering. Volume 28:Issue 4(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-12-08
• Subjects: miniature -- moderate‐wideband -- stub -- superconducting filter; Microwave devices -- Computer-aided design -- Periodicals; Computer-aided engineering -- Periodicals; 621.3813
• DOI: 10.1002/mmce.21220
• Languages: English
• ISSNs: 1096-4290

Abstract

Abstract: This paper presents a design method for moderate‐wideband filters with modified λ/2 stub resonators mid‐tapped by λ/4 connecting lines which act as admittance inverters. The modified tapped‐stubs avoid low characteristic impedances of the stubs which results in a very wide strip‐width and a large circuit size. An example filter at 2250 MHz with a fractional bandwidth (FBW) of 45% is successfully designed with this method and fabricated. It has a compact size of 26.5 mm × 10.5 mm on a YBCO/LaAlO3 superconducting wafer. The measurements show good response and match well with the simulations.