Communications: radio wave antennas – Antennas – With grounding structure
Reexamination Certificate
2005-03-22
2005-03-22
Wimer, Michael C. (Department: 2828)
Communications: radio wave antennas
Antennas
With grounding structure
C343S752000, C343S860000, C343S899000
Reexamination Certificate
active
06870514
ABSTRACT:
A monopole antenna having a ground plane, a vertically extending feed line passing through a feed hole in the ground plane, a top hat in the shape of a disk connected to the feed line, the top hat being spaced from and extending over at least a portion of the ground plane, and a matching network disposed in a space between the top hat and ground plane, the matching network being arranged to effectively extend the feed hole in the ground plane. Such an antenna structure improves antenna bandwidth without increasing antenna volume or requiring external matching circuitry.
REFERENCES:
patent: 5539418 (1996-07-01), Egashira et al.
Foltz et al. “Disk-Loaded Monopoles with Parallel Strip Elements” IEEE Transactions on Antennas and Propagation, vol. 46, No. 12, Dec. 1998.
Friedman, “Wide-Band Matching of a Small Disk Loaded Monopole” IEEE Transactions on Antennas and Propagation, vol. AP-33, No. 10, Oct. 1985.
Goubau, “Multi-element Monopole Antennas” Proc. ECOM-ARO Workshop on Electrically Small Antennas, Fort Monmouth, NJ, May 6 and May 7, pp. 63-67.
Honeywell International , Inc.
Shaw Pittman LLP
Wimer Michael C.
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