Design and Performance of an Ultra-Narrowband Superconducting Filter at UHF Band

✍ Scribed by Shichao Jin, ; Bin Wei, ; Bisong Cao, ; Xiaoping Zhang, ; Xubo Guo, ; Huili Peng, ; Yunlong Piao, ; Baoxin Gao,

• Book ID: 120255333
• Publisher: IEEE
• Year: 2008
• Tongue: English
• Weight: 160 KB
• Volume: 18
• Category: Article
• ISSN: 1531-1309
• DOI: 10.1109/LMWC.2008.922624

✦ Synopsis

A stepped impedance spiral resonator suitable for high-temperature superconducting (HTS) filter with bandwidth narrower than 0.5% is presented. An eight-pole demonstration HTS filter is developed with a central frequency of 650 MHz and a bandwidth of 0.3%. The measurements show that the insertion loss is less than 0.3 dB, and the return loss is better than 16 dB. The filter has out-of-band rejections of 65 dB at 2 MHz below the passband and 80 dB at 2 MHz above the passband, respectively.