Title :
Design and Performance of an Ultra-Narrowband Superconducting Filter at UHF Band
Author :
Jin, Shichao ; Wei, Bin ; Cao, Bisong ; Zhang, Xiaoping ; Guo, Xubo ; Peng, Huili ; Piao, Yunlong ; Gao, Baoxin
Author_Institution :
Dept. of Phys., Tsinghua Univ., Beijing
fDate :
6/1/2008 12:00:00 AM
Abstract :
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.
Keywords :
UHF filters; high-temperature superconductors; resonators; superconducting filters; frequency 2 MHz; frequency 650 MHz; high-temperature superconducting filter; insertion loss; return loss; stepped impedance spiral resonator; ultra-narrowband superconducting filter; Bandpass filters (BPFs); microstrip; narrowband; superconducting;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2008.922624
