Patent ID: 7525479

Claim:
A radar apparatus comprising: an antenna array in which a plurality of antennas that can transmit as well as receive are arranged; and a selector that selects a transmitting antenna and a receiving antenna from among the plurality of antennas of the antenna array, wherein a transmission wave whose frequency has been modulated is transmitted from the transmitting antenna selected by the selector, a reflected wave obtained from reflection of the transmission wave is received by one of receiving antennas selected by the selector by successively switching the receiving antennas, and an azimuth of an object is detected using a phase difference between reflected waves received by the receiving antennas, and wherein, of the plurality of antennas in the antenna array, there are N1 antennas that can transmit as well as receive arranged with a spacing d therebetween at a first end portion of the antenna array, there are N1 antennas that can transmit as well as receive arranged with a spacing d therebetween at a second end portion of the antenna array, and a spacing between respective antennas of the first and second end portions that are closest to a central portion of the array is N 1 ×d.