Patent ID: 9696417
Date: 2017-07-04
CPC Classifications: G01S,H01Q

Claim:
1. An antenna that transmits a transmission wave, the antenna comprising: a plurality of transmitting antennas including: a first transmitting antenna that transmits a first transmission wave having a first transmission range in a right-upward direction relative to a reference axis substantially parallel to a road surface; a second transmitting antenna that transmits a second transmission wave having a second transmission range in a left-upward direction relative to the reference axis; a third transmitting antenna that transmits a third transmission wave having a third transmission range in a right-downward direction relative to the reference axis; and a fourth transmitting antenna that transmits a fourth transmission wave having a fourth transmission range in a left-downward direction relative to the reference axis, wherein the first, second, third and fourth transmission ranges all partially overlap each other, and the plurality of transmitting antennas transmit the first-fourth transmission waves in order in a first time period and transmit the first-fourth transmission waves substantially simultaneously in a second time period that is different from the first time period.