RADAR ANTENNA SYSTEM

PURPOSE:To reduce number of components and to make the housing small by providing a stator being a component of an ultrasonic wave motor to a drive main body supporting a support shaft turably so as to directly drive the support shaft. CONSTITUTION:A flange 241 is formed to a lower part of a hollow part 231 of a support shaft 23 and a rotary coupler 24 to lead a radio wave to the antenna main body 11 is inserted thereto. A flange formed to a waveguide whose one end is led to a transmission reception section is connected to the flange 241 and the rotary coupler 24 is supported by the waveguide. The support shaft 23 is support rotatably to a drive main body 12 through two bearings 16, 22 and a rotor 18 being a component of an ultrasonic wave motor is loaded to the center. When a drive power is given to a stator 19 whose rotor drive part 191 is in contact with a recessed groove 181 of the rotor 18, the rotor 18 is driven once for several seconds. Thus, a transmission mechanism to drive the antenna main body 11 is not required.