Title :
A high-temperature superconducting bandpass filter with microstrip quarter-wavelength spiral resonators
Author :
Zhang, Guoyong ; Lancaster, Michael J. ; Huang, Frederick
Author_Institution :
Dept. of Electron. & Electr. & Comput. Eng., Univ. of Birmingham, UK
Abstract :
A high-temperature superconducting bandpass filter at 408 MHz using microstrip quarter-wavelength spiral resonators is demonstrated. The quarter-wavelength spiral resonators were shorted to ground, as in a combline filter, via a grounding strip that is attached to the box wall by a number of aluminum bonding wires. The introduction of the normal metal wires does not introduce a measurable attenuation. The filter achieves a symmetrical quasi-elliptic characteristic by using two cross-coupling links. The experimental results of the filter are in very good agreement with the simulated ones.
Keywords :
aluminium; band-pass filters; comb filters; microstrip couplers; microstrip filters; microstrip resonators; superconducting filters; superconducting microwave devices; 408 MHz; Al; aluminum bonding wires; comb-line filter; cross-coupling links; grounding strip; high-temperature superconducting bandpass filter; metal wires; microstrip quarter-wavelength spiral resonators; Band pass filters; Grounding; High temperature superconductors; Microstrip filters; Microstrip resonators; Resonator filters; Spirals; Strips; Superconducting filaments and wires; Superconducting filters; Bandpass filter; combline; microstrip; quarter-wavelength; quasi-elliptic; spiral; superconducting;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2005.862711
