Article comprising a superconducting RF filter

Details Article comprising a superconducting RF filter Article comprising a superconducting RF filter

1998-08-21

2000-09-05

Hardy, David

Active solid-state devices (e.g., transistors, solid-state diode

Housing or package

Multiple housings

257685, 257691, 257707, H01L 2302, H01L 2352, H01L 2310

Patent

active

061147583

ABSTRACT:
The disclosed superconducting multipole RF filter comprises a multiplicity of coupled circular disk resonators designed for operation in the TM 010 mode. The disk resonators are arranged in a co-axial stack, with a circular metal spacer sandwiched between any two neighboring disk resonators. Each metal spacer has a central through-aperture, with a conductive member disposed in the through-aperture and electrically connecting the two neighboring disk resonators that are sandwiching a given metal spacer. A disk resonator comprises two circular members, each circular member comprising a circular dielectric substrate, exemplarily a LaAlO.sub.3 wafer. Superconducting layers (typically YBCO) are disposed on each major surface of the substrate. The two members are joined together such that conductive layers (typically gold) electrically connect the two outside superconducting layers. The disclosed RF filter has good power handling capability, is compact, has good heat removal and relatively simple tuning. It can, for instance, be advantageously used as transmit filter in base stations of a wireless communication system.

REFERENCES:
Kolesov, S. et al., Extended Abstract, International Superconducting Electronics Conference, M63, pp. 272-274, Jun. 1997.
IEEE Transactions on Applied Superconductivity, vol. 7(2), Jun. 1997, pp. 2446-2453.
Ma, Zhengxiang et al., Extended Abstract, International Superconducting Electronics Conference, vol. 1, pp. 128-130, Jun. 1997, Berlin, Germany.
Bahl, I. et al., "Microwave Solid State Circuit Design", John Wiley and Sons, 1988, (especially Chapter 6).
Matthaei, G. et al., "Microwave Filters, Impedance Matching Networks and Coupling Structures", Artech House, Inc., 1980(especially Chapter 8).

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