Communications: radio wave antennas – Antennas – With lumped reactance for loading antenna
Reexamination Certificate
2005-07-19
2005-07-19
Wimer, Michael C. (Department: 2828)
Communications: radio wave antennas
Antennas
With lumped reactance for loading antenna
C343S822000, C343S860000
Reexamination Certificate
active
06919851
ABSTRACT:
A broadband loaded antenna and matching network with related methods for design optimization are disclosed. The loaded antenna structures may preferably be either monopole or dipole antennas, but the particular methods and techniques presented herein may be applied to additional antenna configurations. The load circuits positioned along an antenna may comprise parallel inductor-resistor configurations or other combinations of passive circuit elements. A matching network for connecting an antenna to a transmission line or other medium preferably includes at least a transmission line transformer and a parallel inductor. Various optimization techniques are presented to optimize the design of such broadband monopole antennas. These techniques include implementation of simple genetic algorithms (GAs) or micro-GAs. Component modeling for selected components may be effected through either lumped element representation or curved wire representation. Measured results are presented to ensure that certain design criteria are met, including low voltage standing wave ratio (VSWR) and high gain over a desired frequency band.
REFERENCES:
patent: 4328501 (1982-05-01), DeSantis et al.
patent: 5600335 (1997-02-01), Abramo
patent: 5734352 (1998-03-01), Seward et al.
PCT International Search Report, International Application No. PCT/US02/23998, date of completion of International Search Sep. 26, 2002, date of mailing of International Search Report Dec. 18, 2002. The three U.S. Patents cited in International Search Report listed above.
K. Yegin and A. Q. Martin, “Very Broadband Loaded Monopole Antennas,”IEEE AP-S International Symposium Digest, vol. 1, pp. 232-235, Jul. 1997, Montreal, Canada.
D. L. Carroll, “Chemical Laser Modeling with Genetic Algorithms,”AIAA Journal, vol. 34, No. 2, pp. 338-346, Feb. 1996.
Alona Boag, Amir Boag, Eric Michielssen and Raj Mittra, “Design of Electrically Loaded Wire Antennas Using Genetic Algorithms,”IEEE Transactions on Antenna Propagation, vol. AP-45, pp. 1494-1501, Oct. 1997.
Zwi Altman, Raj Mittra and Alona Boag, “New Designs of Ultra Wide-Band Communication Antennas Using a Genetic Algorithm,”IEEE Transactions on Antennas and Propagation, vol. 45, No. 10, Oct. 1997.
Shawn D. Rogers, John C. Young and Chalmers M. Butler, “Computational Models For Practical Antenna Loads,” Department of Electrical and Computer Engineering, Clemson University, Clemson, SC,IEEE, 0-7803-6369, Aug. 2000.
Butler Chalmers M.
Martin Anthony Q.
Rogers Shawn D.
Clemson University
Dority & Manning P.A.
Wimer Michael C.
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