Title :
Ultra-narrowband HTS filter with 2.5-wavelength hairpin resonators in 7 GHz band
Author :
Shiokawa, Noritsugu ; Kayano, Hiroyuki ; Yamazaki, Mutsuki ; Watanabe, Takatoshi ; Aiga, Fumihiko ; Hashimoto, Tatsunori
Author_Institution :
Toshiba Corp., Kawasaki
Abstract :
We have developed an ultra-narrowband high-temperature superconducting (HTS) filter with a fractional bandwidth of 0.14% in the 7 GHz band. To realize a filter with which a narrow bandwidth and low insertion loss are compatible, resonators with high unloaded Q (Qu) value are required. Hairpin microstrip resonators with 2.5 times wavelength were adopted to suppress the radiation loss and realize a high Qu value. With both the hairpin resonators and transmission zeros supplied by an 8-pole quasi-elliptic function filter construction, designed filter properties were realized. Next-generation RF applications are expected to be realized by applying these filters.
Keywords :
microstrip filters; microstrip resonators; resonator filters; superconducting filters; superconducting resonators; fractional bandwidth; frequency 7 GHz; hairpin microstrip resonators; high-temperature superconducting; narrow bandwidth; quasi-elliptic function filter; radiation loss; transmission zeros; ultra-narrowband HTS filter; Band pass filters; Bandwidth; Dielectric losses; Frequency; High temperature superconductors; Insertion loss; Microstrip resonators; Resonator filters; Superconducting filters; Surface resistance; hairpin resonator; high-temperature superconductor; quasi-elliptic function filter; radiation loss;
Conference_Titel :
Microwave Conference, 2006. APMC 2006. Asia-Pacific
Conference_Location :
Yokohama
Print_ISBN :
978-4-902339-08-6
Electronic_ISBN :
978-4-902339-11-6
DOI :
10.1109/APMC.2006.4429533
