Superconducting filter for IMT-2000 band

In this paper, a new design of microstrip-line superconducting filters for IMT-2000 band application is presented, The design features high selectivit y by means of creating transmission zeros and using many resonators. As a d emonstration, a 16- and 32-pole filter 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 diele ctric film. The tuning was carried out based on a novel method of measureme nt. These techniques are also described.