Directional antenna

Communications: radio wave antennas – Antennas – With variable reactance for tuning antenna

Reexamination Certificate

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C343S7000MS

Reexamination Certificate

active

07034761

ABSTRACT:
An antenna includes a dielectric substrate, an ative antenna element carried by the dielectric substrate, and passive antenna elements carried by the dielectric substrate. The passive antenna elements are laterally adjacent the active antenna element. A respective impedance element is selectively connectable to each passive antenna element for antenna beam steering. Image elements are carried by the dielectric substrate, and a respective image element is connected to each impedance element and ground.

REFERENCES:
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patent: 6476773 (2002-11-01), Palmer et al.
patent: 6480157 (2002-11-01), Palmer et al.
Ohira et al., Electronically Steerable Passive Array Radiator Antennas for Low-Cost Analog Adaptive Beamforming, 0-7803-6345-0/00, 2000, IEEE.
Scott et al., Diversity Gain From a Single-Port Adaptive Antenna Using Switched Parasitic Elements Illustrated with a Wire and Monopole Prototype, IEEE Transactions on Antennas and Propagation, vol. 47, No. 6, Jun. 1999.
King, The Theory of Linear Antennas, pp. 622-637, Harvard Univesity Press, Cambridge, Mass., 1956.
Lo et al., Antenna Handbook: Theory, Applications and Design, pp. 21-38, Van Nostrand Reinhold Co., New York, 1988.

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