Communications transceiver using an adaptive directional antenna
First Claim
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1. A directionally adaptive antenna system for use with a portable communications transceiver for communicating with a base station in a communications network, said system comprising:
- (a) at least two antennae, connected to said transceiver, for receiving a first signal from said base station;
(b) circuitry coupled to one of said antennae to enable said antennae to generate together a plurality of antenna patterns having mutually exclusive directionality;
(c) a switch, operable with said transceiver, for selecting one of said plurality of antenna patterns which provides a maximum signal strength of said first signal received from said base station; and
(d) a switch operator for operating the switch to select the one of said plurality of antenna patterns, wherein said switch operator operates the switch to periodically select each of said antenna patterns to determine which one of said antenna patterns provides said maximum signal strength of said first signal received from said base station.
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Abstract
A directional antenna connected to a portable communications transceiver is adaptively directed towards a remote station in a communication system. The amount of RF power required by the portable device is significantly reduced, relative to a non-directional antenna. The operational period of the transceiver between battery recharges is therefore considerably maximized.
209 Citations
26 Claims
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1. A directionally adaptive antenna system for use with a portable communications transceiver for communicating with a base station in a communications network, said system comprising:
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(a) at least two antennae, connected to said transceiver, for receiving a first signal from said base station; (b) circuitry coupled to one of said antennae to enable said antennae to generate together a plurality of antenna patterns having mutually exclusive directionality; (c) a switch, operable with said transceiver, for selecting one of said plurality of antenna patterns which provides a maximum signal strength of said first signal received from said base station; and (d) a switch operator for operating the switch to select the one of said plurality of antenna patterns, wherein said switch operator operates the switch to periodically select each of said antenna patterns to determine which one of said antenna patterns provides said maximum signal strength of said first signal received from said base station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A directionally adaptive antenna system for use with a portable communications transceiver for communicating with a base station in a communications network, said system comprising:
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(a) antenna means comprising at least two monopole elements for receiving a first signal from said base station and transmitting a second signal to said base station, said antenna means connected to said transceiver; wherein said antenna means is adaptable to generate together a plurality of antenna patterns having mutually exclusive directionality; (b) comparator means, connected to said antenna means, for determining an optimum one of said antenna patterns which provides a maximum signal strength of said first signal received from said base station; (c) phase shift means, connected to said antenna means, for establishing a desired signal phase relationship between each of said monopole elements; and (d) switch means, responsive to said comparator means and operable with said phase shift means, for selecting one of said antenna patterns which provides the maximum signal strength of said first signal received from said base station. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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23. A method for directionally adapting an antenna system for use with a portable communications transceiver for communicating with a base station in a communications network, said method comprising the steps of:
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(a) receiving, via an antenna having at least two monopole elements, a first signal from said base station; (b) determining an optimum antenna pattern from a plurality of antenna patterns which provides a maximum signal strength of said first signal received from said base station; and (c) establishing a desired signal phase relationship between each of said monopole elements to generate said optimum antenna pattern. - View Dependent Claims (24, 25, 26)
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Specification