Superconductor technology: apparatus – material – process – High temperature devices – systems – apparatus – com- ponents,... – High frequency waveguides – resonators – electrical networks,...
Patent
1996-06-17
1999-03-30
Lee, Benny T.
Superconductor technology: apparatus, material, process
High temperature devices, systems, apparatus, com- ponents,...
High frequency waveguides, resonators, electrical networks,...
505700, 505701, 505866, 333204, 333205, 333219, H01P 1203
Patent
active
058889426
ABSTRACT:
Microwave hairpin-comb filters utilize a plurality of hairpin (i.e., folded) half-wavelength microstrip or stripline resonators arranged side-by-side and all with the same orientation. The coupling regions between resonators extend parallel to the sides of the resonators for substantially 1/8 to 1/4 wavelength at the frequency of resonance of the resonators. This length of coupling region between resonators, along with all resonators being oriented in the same direction, result in resonance effects in the coupling regions between the resonators. These effects greatly reduce the couplings between the resonators so that the resonators can be very closely spaced so as to produce a compact filter structure yet still have a narrow passband. For example, a compact narrow band filter structure is possible using high-Q nominally half wavelength hairpin resonators. The structure can also be made to produce poles of attenuation adjacent to the passband in order to enhance the filter cutoff characteristic. The filter structure can be conveniently tuned using asymmetric dielectric pieces which rotate above an interdigital conductor or other two conductors pattern placed between the open ends of each resonator, the axis of rotation being normal to the substrate. This manner of tuning is particularly attractive for narrow-band, very low loss, high temperature superconductor (HTS) filters since these tuners can be made to give smooth tuning with no normal metal parts in the circuit and with no ground connections required. Such normal metal parts or ground connections would introduce considerable loss and degrade the HTS filter performance.
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"Hairpin-Line and Hybrid Hairpin-Line/Half-Wave Parallel-Coupled-Line Filters," EG Cristal and S Frankel IEEE Trans. MTT, (Nov. 1972) vol. MTT-20, pp.719-728.
"Parallel-Couped Transmission-Line-Resonator Filters," SB Cohn IRE Trans. PGMTT, (Apr. 1958) vol. MTT-6, pp. 223-231.
"Miniaturized Hairpin Resonator Filters and Their Appication ot Receiver Front-End MIC's," M Sagawa, K Takahashi, and M Makimoto IEEE Trans. MTT, (Dec. 1989) vol. 37, pp. 1991-1997.
"Novel, Staggered Resonator Array Superconducting 2.3-GHz Bandpass Filters," GL Mattaei and GL Hey-Shipton IEEE Trans. MTT, (Dec. 1993) vol. 41, pp. 2345-2352.
Lee Benny T.
Superconductor Technologies Inc.
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