Adaptive antenna for use in wireless communication systems
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United States of America Patent
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May 5, 2009
Grant Date -
Sep 13, 2007
app pub date -
May 8, 2007
filing date -
Sep 21, 1998
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An antenna apparatus, which can increase capacity in a cellular communication system or Wireless Local Area Network (WLAN), such as an 802.11 network, operates in conjunction with a mobile subscriber unit or client station. At least one antenna element is active and located within multiple passive antenna elements. The passive antenna elements are coupled to selectable impedance components for phase control of re-radiated RF signals. Various techniques for determining the phase of each antenna element are supported to enable the antenna apparatus to direct an antenna beam pattern toward a base station or access point with maximum gain, and, consequently, maximum signal-to-noise ratio. By directionally receiving and transmitting signals, multipath fading is greatly reduced as well as intercell interference.
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