Title :
A high-temperature superconducting filter for future mobile telecommunication systems
Author :
Hong, Jia-Sheng ; McErlean, Eamon P. ; Karyamapudi, Bindu M.
Author_Institution :
Dept. of Electr., Electron. & Comput. Eng., Heriot-Watt Univ., Edinburgh, UK
fDate :
6/1/2005 12:00:00 AM
Abstract :
This paper presents a narrow-band high-temperature superconducting bandpass filter on a sapphire substrate applicable to future mobile communications systems. The design and simulation of a ten-pole quasi-elliptic function filter implemented using a cascaded quadruplet trisection coupling topology is discussed. The filter is designed to have a 10-MHz passband in the Universal Mobile Telecommunications System base-station receive band. The filter substrate was a sapphire wafer measuring 47 mm ×17 mm ×43 mm, which had a double-sided thin-film coating of Yba2Cu3O7. The filter displayed a minimum insertion loss of 0.2 dB in the passband and a return loss better than (-12dB preliminary) over the passband. A high performance out-of-band rejection associated with a quasi-elliptic filter function was also recorded.
Keywords :
3G mobile communication; band-pass filters; elliptic filters; high-temperature superconductors; microstrip filters; microwave filters; superconducting filters; superconducting microwave devices; UMTS; Universal Mobile Telecommunications System; YBCO; YBa2Cu3O7; base-station receive band; cascaded quadruplet trisection coupling topology; double-sided thin-film coating; filter substrate; high-temperature superconducting filter; insertion loss; microstrip filters; microwave filters; mobile telecommunication systems; narrow-band superconducting bandpass filter; out-of-band rejection; quasielliptic function filter; sapphire substrate; sapphire wafer; ten-pole function filter; Band pass filters; Coatings; High temperature superconductors; Mobile communication; Narrowband; Passband; Substrates; Superconducting filters; Topology; Transistors; Bandpass filters; microstrip filters; microwave filters; superconducting filters;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2005.848840