ARRAY ANTENNA AND RADAR APPARATUS

PROBLEM TO BE SOLVED: To easily enlarge a variable range of beam without causing apparatus scale or signal throughput to be enlarged. SOLUTION: A transmitting antenna part 2 and a receiving antenna part 5 of a radar apparatus 1 include one or more array antennas 21, whereon traveling wave power feeding is performed. Each array antenna 21 includes radiating elements 23, disposed in one line and a power feeding line 25 wired in a crank shape for connecting the radiation elements 23 in series, and the radiation elements 23 are wired not within a shortest distance but while being detoured. Thus, a power feeding line length DL (a phase shift amount as a result) between the radiation elements 23 can be increased, without increasing an arrangement interval D of the radiation elements 23. As a result, the ratio to the change in a direction of beam, in response to the change in power feeding signal frequency, can be enlarged, and a variable range of beam can be ensured fully. COPYRIGHT: (C)2010,JPO&INPIT