Antenna diversity system
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United States of America Patent
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Jun 29, 2004
Grant Date -
N/A
app pub date -
Apr 13, 1999
filing date -
Apr 22, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An antenna diversity system includes at least two antennas. Each antenna may be connected via a common connection point to a receiver by a respective switch which presents a low impedance connection between the antenna and receiver in the on state and a substantially reactive load to the antenna in the off state. Selection of appropriate impedances for the off state load enables the antennas to function as an array with a variety of beam patterns depending on the state of the switches. Cycling through a sequence of switch states steers the antenna beam providing improved resistance to fading and multipath effects. Alternatively, the antennas may be connected to a hybrid coupler, which enables two beam patterns to be available simultaneously for signal quality measurement and comparison.
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