Communication apparatus
First Claim
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.
1 Assignment
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Accused Products
Abstract
A communication apparatus communicating other apparatuses includes: a switch for switching between a vertical polarized antenna and a horizontal polarized antenna; a communication device for transmitting and receiving the electric wave via one of the antennas, 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 such 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. The distance threshold is larger than a distance between the apparatus and a dip point.
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Citations
5 Claims
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1. A communication apparatus mounted on a vehicle and communicating other apparatuses comprising:
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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. - View Dependent Claims (2, 3, 4, 5)
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Specification