公开(公告)号：JPH09186502A

公开(公告)日：1997-07-15

申请号：JP25975896

申请日：1996-09-30

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： KUWANYON KAN ,  SEOOKUKIRU HAN ,  JIEHA KIMU

IPC: C30B29/22 ,  C30B33/08 ,  H01P1/203 ,  H01P1/205 ,  H01P1/208 ,  H01P11/00 ,  H03H9/00

Abstract: PROBLEM TO BE SOLVED: To adjust the characteristic impedance of the band pass filter to be an optional impedance by varying parameters such as a line width and a diameter of a torus or disk duplex mode resonator with perturbation structure. SOLUTION: A torus duplex mode resonator forms a 2-pole band pass filter and since the number of microstrip coupling line 4 is one, the total number of poles is five. The center frequency is designed to be 500MHz and the coupling line 4 is realized to be a diversified mode to attain excellent coupling. A signal transmission input terminal 1a and an output terminal 1 are made of high temperature superconducting microstrip lines whose resistance is nearly 50ohms and in contact with glass beads fitted to a housing of a test jig. In this case, in order to minimize the contact resistance and the loss, a gold pad 2 is vapor- depositted through electron rays onto the microstrip conductors and a dual layer (Ti layer/Ag layer) thin film is vapor-depositted to the electric matching and contact with the inner bottom face of the test jig through electron rays.