Patent ID: 8009082

Claim:
A mobile radar comprising: a planar antenna; and a transmitter-receiver unit, wherein the planar antenna includes at least one transmitting array antenna and three or more receiving array antennas, wherein the three or more receiving array antennas are aligned in a horizontal direction, wherein the receiving array antennas has the number of antenna elements of the receiving array antennas positioned at both outer ends thereof which are aligned in the horizontal direction which is larger than the number of antenna elements of the other at least one receiving array antenna positioned at inner side in the horizontal direction, wherein an outermost antenna element is smaller than an innermost antenna element in the weighting of the receiving sensitivity of the receiving antennas located at both outer ends thereof in the horizontal direction, and wherein the respective receive signals obtained by reflecting a radio wave transmitted from the transmitting array antenna by at least one obstacle and received by the respective receiving array antennas are synthesized in directivity after being weighted in the amplitude/phase, and an azimuth angle being null or low sensitivity is scanned to specify azimuth orientation of the at least one obstacle.