Fourpoint antenna

Communications: radio wave antennas – Antennas – Microstrip

Reexamination Certificate

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C343S853000, C343S873000

Reexamination Certificate

active

06842141

ABSTRACT:
Wideband antennas with omnidirectional coverage have both military and commercial applications. In one embodiment, the Planar Inverted Cone Antenna (PICA) is composed of a single flat element vertically mounted above a ground plane. A geometry of Planar Inverted Cone Antenna (PICA) is based on the conventional circular-disc antenna with trimmed top part having the shape of a planar-inverted cone, in a second embodiment, the Fourpoint antenna also provides balanced impedance over the operating band and has useful radiation patterns and dual polarization over its operating frequency.

REFERENCES:
patent: 4163236 (1979-07-01), Kaloi
patent: 4903033 (1990-02-01), Tsao et al.
patent: 5926137 (1999-07-01), Nealy
patent: 5929813 (1999-07-01), Eggleston
patent: 6057802 (2000-05-01), Nealy et al.
Wide-Band Planar Monopole Antennas; N. Agrawall, G. Kumar, and K. P. Ray; IEEE Transactions on Antennas and Propagation, vol. 46, No. 2; Feb. 1998.
A Disk Monopole Antenna with 1:8 Impedance Bandwidth and Omnidirectional Radiation Pattern; S. Honda, M. Ito, H. Seki and Y. Jinbo; Proceedings of ISAP92, Apporo, Japan pp. 1145-1148.
A Broadband Omnidirectional Antenna; R. M. Taylor, Computer Sciences Corp., 1994, IEEE 1294.
Planar Trapexoidal and Pentagonal Monopoles with Impedance Bandwidth in Excess of 10:1; J. A. Evans and M. J. Ammann; Dept. Of Electrical & Communication Engineering Dublin Institute of Technology, 1999, IEEE International Symposium, vol. 3.

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