Patent ID: 6397067
Filing Date: 2002-05-28
Classification: H04B,H04W

Abstract:
A road transmission equipment used for a communication system between a road and a vehicle, which communicates between a road communication station arranged in a cell and a vehicle-mounted mobile station within the cell, comprising:a first transmitting antenna having a directivity in a running direction of a vehicle, a second transmitting antenna having a directivity in the opposite direction to the running direction of the vehicle, a first transmitting section and a second transmitting section respectively connected to the first transmitting antenna and the second transmitting antenna to output signals of the same frequency, and a frequency correction section, wherein; the frequency correction section provides the first transmitting section with a positive frequency offset for increasing the frequency of a signal supplied to the first transmitting antenna, and provides the second transmitting section with a negative frequency offset for lowering the frequency of a signal supplied to the second transmitting antenna.