Design and performance of an ultra-narrowband superconducting filter at UHF band

作者：Jin Shichao^*; Wei Bin; Cao Bisong; Zhang Xiaoping; Guo Xubo; Peng Huili; Piao Yunlong; Gao Baoxin

来源：IEEE Microwave and Wireless Components Letters, 2008, 18(6): 395-397.

DOI：10.1109/LMWC.2008.922624

• bandpass filters (BPFs)
• microstrip
• narrowband
• superconducting

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.

• 出版日期2008-6
• 单位清华大学