| 摘要 |
<p>An information transmission system working with electromagnetic waves comprising a l:st communication unit (1) with a 1:st transmitter and a 1:st receiver and a 2:nd communication unit (5) with a 2:nd receiver and a 2:nd transmitter. The 1:st communication unit is mounted on a stationary stand (2) and the 2:nd communication unit (5) is mounted on a vehicle (3), movable along a path (4). The antenna lobes of the transmitters and receivers are designed and oriented in such a way that communication between the l:st and 2:nd communication unit is possible, when the vehicle (3) is located within a relatively short distance from the stand (2). The information transmission system is primarily characterized in that the 1:st transmitter is so designed, that its antenna transmits a linearly polarized wave, whose polarization vector (E vector) in the polarization plane principally forms an angle α with the horizontal component in the polarization plane, α being preferably 45°. The receivers and the 2:nd transmitter are all arranged to receive and transmit, respectively, a wave with corresponding polarization. Thereby, disturbing reflexes in existing principally horizontal and vertical surfaces (8) on the vehicle (3) are avoided.</p> |
