Electronic digital logic circuitry – Exclusive function – Exclusive nor
Reexamination Certificate
2005-08-23
2005-08-23
Tokar, Michael (Department: 2819)
Electronic digital logic circuitry
Exclusive function
Exclusive nor
C333S202000, C455S561000
Reexamination Certificate
active
06933748
ABSTRACT:
A filter network designed for providing high frequency selectivity with a high degree of reliability and availability. The filter network comprises a superconducting filter and a non-superconducting filter, or a combination thereof to form multiplexers. A receive side of the non-superconducting filter pre-filters received RF signals before inputting them to the superconducting filter. The non-superconducting filter is constructed and arranged to pass RF signals having a frequency within a first pass band to the superconducting filter. The superconducting device is constructed and arranged to exhibit a high-degree of frequency selectivity in further narrowing the received RF signals. Other aspects are directed to the arrangement, construction, and uses of the same structures to accomplish different but similar goals. In a multiplexed configuration, various combinations of transmit filters are used to enable the use of a common antenna with the receive side electronics, which may be located at the top of the antenna tower or in the base station.
REFERENCES:
patent: 3731759 (1973-05-01), Carlson
patent: 5244869 (1993-09-01), Billing
patent: 5894250 (1999-04-01), Ravaska et al.
patent: 6212404 (2001-04-01), Hershtig
patent: 6263215 (2001-07-01), Patton et al.
patent: 6317003 (2001-11-01), Kobayashi
patent: 6686811 (2004-02-01), Hey-Shipton
patent: 2001/0038320 (2001-11-01), Abdelmonem
patent: 2001/0055960 (2001-12-01), Abdelmonem
patent: 2002/0130730 (2002-09-01), Abdelmonem
patent: 2002/0132591 (2002-09-01), Abdelmonem
Kurzrok, R., RCA Commun. Systems Lab, General Three-Resonator Filters in Waveguide, IEEE Transactions on Microwave Theory and Techniques, pp. 46 and 47, undated.
Pftzenmaier, G., Synthesis and Realization of Narrow-Band Canonical Microwave Bandpass Filters Exhibiting Linear Phase and Transmission Zeros, IEEE Transactions on Microwave Theory and Techniques, vol. MTT-30, No. 9, Sept. 1982; pp. 1300-1311.
Matthaei, G.L., Design of HTS, Lumped-Element, Manifold-Type Microwave Multiplexers; IEEE Transactions on Microwave Theory & Techniques, vol. 44, No. 7, Jul. 1996.
Mai Lam T.
O'Melveny & Myers LLP
Superconductor Technologies Inc.
Tokar Michael
LandOfFree
Filter network combining non-superconducting and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Filter network combining non-superconducting and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Filter network combining non-superconducting and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3463887