US 7,532,918 B2
Superconductive filter having U-type microstrip resonators with longer and shorter parallel sides
Bisong Cao, Beijing (China); Meihong Zhu, Beijing (China); Xubo Guo, Beijing (China); Guyoyong Zhang, Beijing (China); Shan He, Beijing (China); Irana B. Vendik, St. Petersburg (Russian Federation); and Yaroslav Kolmakov, St. Petersburg (Russian Federation)
Assigned to Tsinghua University, Beijing (China)
Appl. No. 10/540,332
PCT Filed Dec. 18, 2003, PCT No. PCT/CN03/01082
§ 371(c)(1), (2), (4) Date Jun. 30, 2006,
PCT Pub. No. WO2004/075338, PCT Pub. Date Sep. 02, 2004.
Claims priority of application No. 02 1 56889 (CN), filed on Dec. 20, 2002.
Prior Publication US 2006/0276343 A1, Dec. 07, 2006
Int. Cl. H01P 1/203 (2006.01); H01B 12/02 (2006.01)
U.S. Cl. 505—210  [333/99 S; 333/204] 9 Claims
OG exemplary drawing
 
1. A superconductive microstrip filter, comprising:
an input coupling line, for receiving signals to be filtered and coupling-outputting said signals;
a plurality of U-type superconductive microstrip resonators with the same structure and dimension, for performing filtering process for said signals output by said input coupling line to obtain filtered signals in a corresponding frequency band and then coupling-outputting said filtered signals;
an output coupling line, for coupling-outputting said filtered signals outputted by said plurality of U-type superconductive microstrip resonators;
wherein each of said plurality of U-type superconductive microstrip resonators comprises a superconductive microstrip line bent to a U-type structure having a longer side and a shorter side that are parallel and of different lengths, the superconductive microstrip line having a whole length of half of the wavelength corresponding to the center frequency of said superconductive microstrip filter;
wherein said longer sides and said shorter sides of all of said plurality of U-type superconductive microstrip resonators are parallel, and wherein each neighboring pair in said plurality of U-type superconductive microstrip resonators is arranged axisymmetrically, the U-type superconductive microstrip resonators of each of said neighboring pairs having said longer side closer to a symmetrical axis than said shorter side.