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Communication apparatus

  • US 20090295676A1
  • Filed: 05/29/2009
  • Published: 12/03/2009
  • Est. Priority Date: 05/30/2008
  • Status: Active Grant
First Claim
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1. A communication apparatus mounted on a vehicle and communicating other apparatuses comprising:

  • a switch for switching between a vertical polarized antenna and a horizontal polarized antenna, wherein the vertical polarized antenna transmits and receives an electric wave, which has a polarization surface perpendicular to a ground surface, and the horizontal polarized antenna transmits and receives the electric wave, which has another polarization surface in parallel to the ground surface;

    a communication device for transmitting and receiving the electric wave via one of the vertical polarized antenna and the horizontal polarized antenna, which is selected by the switch;

    a monitor for monitoring a relative distance between the apparatus and other apparatuses; and

    a controller for controlling the switch in such a manner that the switch selects the vertical polarized antenna when the relative distance is equal to or larger than a distance threshold, and the switch selects the horizontal polarized antenna when the relative distance is smaller than the distance threshold,wherein the distance threshold is larger than a distance between the apparatus and a dip point.

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