Title :
A Miniature Wideband VHF Superconducting Filter Using Double-Surface Quasi-CPW Spiral Structures
Author :
Zhan Xu ; Bin Wei ; Bisong Cao ; Xubo Guo ; Xiaoping Zhang ; Linan Jiang ; Yong Heng ; Guoyong Zhang
Author_Institution :
Dept. of Phys., Tsinghua Univ., Beijing, China
Abstract :
Double-surface quasi-coplanar-waveguide spiral structures to attain strong couplings in low-frequency wideband filter designs are presented. Such structures yield coupling coefficients of up to 0.86 at the VHF band. A compact four-pole high-temperature superconducting filter centered at 112 MHz with a 38% fractional bandwidth, 0.03 dB insertion loss, and 17.5 dB return loss is demonstrated. The simulated and measured results show excellent agreement.
Keywords :
VHF filters; circuit simulation; coplanar waveguides; coupled circuits; high-temperature superconductors; losses; network synthesis; resonator filters; superconducting filters; compact four-pole high-temperature superconducting filter; coplanar-waveguide; coupling; double-surface quasiCPW spiral resonator structure; fractional bandwidth; frequency 112 MHz; insertion loss; loss 0.03 dB; loss 17.5 dB; low-frequency wideband filter design; miniature wideband VHF superconducting filter; return loss; Bandpass filters (BPFs); VHF; coplanar waveguides (CPWs); spirals; superconducting filters; wideband;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2013.2262260
