PURPOSE: To provide 360° scanning to the radar by arranging plural element antennas perpendicularly in radial direction at an equal interval on a circumference, providing a printed board provided in parallel with a print power supply circuit and a switching circuit to the element antenna in the circumferential face and covering the board by a radio wave absorbing body from both the sides.

CONSTITUTION: The plural element antennas 4 each made of a printed circuit board 2 are arranged perpendicularly in radial direction at an equal interval nearly on a circumference, number of the circuits each being a feeding circuit 5 and a switching circuit 6 provided on the printed circuit board 2 provided in a face forming circumference as the feeding means to the element antenna 4 is provided by the number of the element antennas 4. Then both the sides of the printed circuit board 2 is covered by a radio wave absorbing body 3 and a radio wave reaching the element antenna 4 from the feeder circuit 5 is interrupted. With the switching circuit 6 turned on/off in time series in the adjacent order, the directivity pattern of the element antenna 4 itself is turned by 360°. Thus, this is equivalent to the turning of one element antenna by 360°, then the 360° search is given to the radar.