Band pass filter having resonators connected by off-set wire...

Superconductor technology: apparatus – material – process – High temperature devices – systems – apparatus – com- ponents,... – High frequency waveguides – resonators – electrical networks,...

Reexamination Certificate

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C333S0990MP, C333S204000

Reexamination Certificate

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10838249

ABSTRACT:
A band pass filter which is configured by a microstrip line, or a strip line is provided. The band pass filter has a first half wavelength resonator which resonates at a center frequency of a pass band, a second half wavelength resonator which resonates at the center frequency of the pass band, and a transmission line through which the first half wavelength resonator is wire-coupled to the second half wavelength resonator. A strong coupling can be stably realized without causing deviation of the resonance frequencies of resonators.

REFERENCES:
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patent: 2003-32004 (2003-01-01), None
patent: WO 02/101872 (2002-12-01), None
Patent Abstracts of Japan; Applicant: Matshushita Electric Ind Co Ltd; Inventor: Setsune et al; Publication No. 05299914; Publication Date: Nov. 12, 1993; Title: Superconductive High Frequcney Resonator and Filter.
Gregory L. Hey-Shipton, “Efficient Computer Design of Compact Planar Band-Pass Filters Using Electrically Short Multiple Coupled Lines”, IEEE Microwave Theory and Techniques Symposium Digest, 1999, pp. 1547-1550.
Kurt F. Raihn, et al., “Highly Selective HTS Band Pass Filter with Multiple Resonator Cross-Couplings”, IEEE Microwave Theory and Techniques Symposium Dighest, 2000, pp. 661-664.
Jia-Sheng Hong, et al., “On The Performance of HTS Microstrip Quasi-Elliptic Function Filters for Mobile Communications Application”, IEEE Transactions on Microwave Theory and Techniques, vol. 48, No. 7, Jul. 2000, pp. 1240-1246.
Genichi Tsuzuki, et al., “Ultra Selective 22-Pole, 10-Transmission Zero Superconducting Bandpass Filter Surpasses 50-Pole Chebyshev Rejection”, IEEE Microwave Theory and Techniques Symposium Digest, 2002, pp. 1963-1966.
Genichi Tsuzuki, et al., “Ultra Selective 22-Pole 10-Transmission Zero Superconducting Bandpass Filter Surpasses 50-Pole Chebyshev Filter”, IEEE Transactions on Microwave Theory and Techniques, vol. 50, No. 12, Dec. 2002, pp. 2924-2929.
Jia-Sheng Hong, et al., “Transmission Line Filters with Advanced Filtering Characteristics”, IEEE Microwave Theory and Techniques Symposium Digest, 2000, pp. 319-322.
U.S. Appl. No. 10/838,249 filed May 5, 2004, Aiga et al.
U.S. Appl. No. 11/688,525 filed Mar. 20, 2007, Aiga et al.

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