Low-loss tunable radio frequency filter

Details Low-loss tunable radio frequency filter Low-loss tunable radio frequency filter

2008-06-27

2009-12-29

Chang, Daniel D (Department: 2819)

Wave transmission lines and networks

Miscellaneous

Multipactor applications

C333S205000

Reexamination Certificate

active

07639101

ABSTRACT:
A tunable RF filter comprises a signal transmission path having an input and output, a plurality of resonant elements disposed along the signal transmission path between the input and output, and a set of non-resonant elements coupling the resonant elements together to form a stop band having a plurality of transmission zeroes corresponding to respective frequencies of the resonant elements, and at least one sub-band between the transmission zeroes. The set of non-resonant elements comprises a first plurality of non-resonant elements respectively coupled in parallel with the resonant elements, and a second plurality of non-resonant elements respectively coupled in series with the resonant elements. The first plurality of non-resonant elements comprises at least one variable non-resonant element for selectively introducing at least one reflection zero within the stop band to create a pass band in one of the one sub-band(s) without varying any of the second plurality of non-resonant elements.

REFERENCES:
patent: 5410284 (1995-04-01), Jachowski
patent: 5543758 (1996-08-01), Wey
patent: 5616539 (1997-04-01), Hey-Shipton
patent: 6633208 (2003-10-01), Salkola et al.
patent: 6662026 (2003-12-01), Cordray et al.
patent: 6662029 (2003-12-01), Eden
patent: 6791430 (2004-09-01), Borzenets et al.
patent: 6933748 (2005-08-01), Hey-Shipton
patent: 7482890 (2009-01-01), Tsuzuki et al.
patent: 2003/0125214 (2003-07-01), Eden et al.
patent: 2003/0206078 (2003-11-01), Hey-Shipton
patent: 2006/0202775 (2006-09-01), Tsuzuki
patent: 2007/0247261 (2007-10-01), Tsuzuki
patent: WO 2007073524 (2007-06-01), None
patent: WO 2007073524 (2007-06-01), None
patent: WO 2007073524 (2007-06-01), None
patent: WO 2009003190 (2008-12-01), None
PCT International Search Report for PCT/US2006/61059, Applicant: Superconductor Technologies, Inc., Forms PCT/ISA/210 and PCT/ISA/220, dated Apr. 30, 2008 (4 pages).
PCT Written Opinion for PCT/US2006/61059, Applicant: Superconductor Technologies, Inc., Form PCT/ISA/237, dated Apr. 30, 2008 (7 pages).
Liang et al. ‘HTS Microstrip filters with multiple symmetric and asymmetric prescribed transmission zeros’ In: IEEE Trans. Microwave Theory Tech., Sunnyvale, CA: IEEE, 1999, vol. 4, p. 1551-1554 (4 pages).
G.L. Matthaei, et al., Microwave Filters, Impdance-Matching Networks, and Coupling Structures, Artech House (1980) (13 pages).
S. Amari, Synthesis of Cross-Coupled Resonator Filters Using an Analytical Gradient-Based Optimization Technique, IEEE Trans. Microwave Theory and Technique, vol. 48, No. 9, pp. 1559-1564, Sep. 2000.
G. L. Hey-Shipton, Efficient Computer Design of Compact Planar Band-Pass Filters Using Electrically Short Multiple Coupled Lines, 1999 IEEE MTT-S Int. Microwave Symp. Dig., Jun. 1999 (4 pages).
G. Tsuzuki, Superconducting Filter for IMT-2000 Band, IEEE Trans. Microwave Theory & Techniques, vol. 48, No. 12, pp. 2519-2525, Dec. 2000.
J.S. Hong, et al., Microstrip Filters for RF/Microwave Applications, John Wiley & Sons, Inc. (241 pages) (2001).
R. Wu, et al., New Cross-Coupled Microstrip Band Reject Filters, Microwave Symposium Digest, 2004 IEEE MTII-S Digest, International vol. 3, 6-11, pp. 1597-1600 Jun. 2004.
PCT International Preliminary Report on Patentability (Chapter I of the Patent Cooperation Treaty) for PCT/US2006/061059, Applicant: Superconductor Technologies, Inc., Form PCT/IB/326 and 373, dated Apr. 30, 2008 (7 pages).
PCT International Search Report for PCT/US2008/068677, Applicant: Superconductor Technologies, Inc., Form PCT/ISA/210 and 220, dated Sep. 25, 2008 (4 pages).
PCT Written Opinion of the International Search Authority for PCT/US2008/068677, Applicant: Superconductor Technologies, Inc., Form PCT/ISA/237, dated Sep. 25, 2008 (4 pages).
Notice of Allowance dated Mar. 31, 2009 in U.S. Appl. No. 11/561,333, filed Nov. 17, 2006, inventor: Genichi Tsuzuki, (7 pages).
Office Action dated Jul. 8, 2009 in U.S. Appl. No. 11/561,333, filed Nov. 17, 2006, inventor: Genichi Tsuzuki, (14 pages).

Affiliated with

Also associated with

Rating

Low-loss tunable radio frequency filter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Low-loss tunable radio frequency filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low-loss tunable radio frequency filter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4052876