Title :
Superconducting filter for IMT-2000 band
Author :
Tsuzuki, Genichi ; Suzuki, Masanobu ; Sakakibara, Nobuyoshi
Author_Institution :
Cryodevice Inc., Aichi, Japan
fDate :
12/1/2000 12:00:00 AM
Abstract :
In this paper, a new design of microstrip-line superconducting filters for IMT-2000 band application is presented. The design features high selectivity by means of creating transmission zeros and using many resonators. As a demonstration, 16- and 32-pole filters were fabricated using YBCO films on a half-area and on the full area of 3-in-diameter MgO wafers, respectively. Excellent attenuation of more than 30 dB, 420 kHz from the lower band edge, and 400 kHz from the upper band edge for the 32-pole filter was achieved. The filters were tuned not with mechanical tuning screws, but with a dielectric film. The tuning was carried out based on a novel method of measurement. These techniques are also described
Keywords :
UHF filters; cellular radio; high-temperature superconductors; microstrip filters; microstrip resonators; passive filters; poles and zeros; resonator filters; superconducting filters; superconducting microwave devices; superconducting resonators; tuning; 16-pole filter; 1930 MHz; 20 MHz; 32-pole filter; IMT-2000 band; MgO; MgO wafers; YBCO films; YBaCuO; dielectric film tuning; hairpin resonators; high selectivity; microstrip-line filters; resonators; superconducting filter; transmission zeros; Attenuation; Dielectric films; Dielectric measurements; Fasteners; Filtering theory; Microstrip filters; Resonator filters; Superconducting films; Superconducting filters; Yttrium barium copper oxide;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
