Title :
UHF Band Ultra-Narrowband Superconducting Filter With Double U-Type Secondary Coupling Structure
Author :
Lu, Xinxiang ; Guo, Xubo ; Jin, Shichao ; Zhang, Xiaoping ; Peng, Huili ; Li, Mingjie ; Wei, Bin ; Cao, Bisong
Author_Institution :
Dept. of Phys., Tsinghua Univ., Beijing, China
Abstract :
A double U-type secondary coupling structure (DUSCS) is used for a compact ultra-narrowband filter in the ultra-high frequency (UHF) band. It can effectively reduce the coupling and thus spacing between coupled twin-spiral resonators. A six-pole superconducting filter at 600 MHz with a fractional bandwidth of 0.083% is designed and fabricated to validate this technique. The filter size is reduced by 15% compared with the filter designed without DUSCSs.
Keywords :
UHF filters; superconducting filters; DUSCS; UHF band; double U-type secondary coupling structure; fractional bandwidth; frequency 600 MHz; six-pole superconducting filter; ultranarrowband superconducting filter; Bandpass filters (BPFs); high temperature superconducting (HTS); microstrip; ultra-narrowband;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2009.2032009
