  This paper presents a novel planar phased array that can work in Ka band
designed for two-dimensional scanning. A four-modes pattern reconfigurable
element based on microstrip Yagi antenna is proposed, and then developed into
the 4X4 phased array, in which two feed points are introduced to reduce
sidelobe level (SLL). The simulated results show that our proposed phased array
is able to cover the scanning range from -60{\deg} to +60{\deg}in
H-plane(yoz-plane) and -47.2{\deg}to +47.2{\deg}in E-plane(xoz-plane) with the
gain reduction less than 3dB, both the SLLs of which are 10dB less than main
beam. The two-dimensional scanning phased array based on pattern reconfigurable
antenna (PRA) presented here is suitable for the satellite communication.
