PURPOSE: To constitute a compact microwave reflecting plate by using a microstrip type array and a transmission line provided on the same plane as said array.

CONSTITUTION: A dielectric base 11 is provided to one side of a ground conductor 10 and plural radiation metallic strips 12, 12' are formed on the base 11 by print. Further, a metallic strip 13 for microstrip line is formed by print directly or via a gap to said metallic strips 12, 12'. Both ends of the metallic strip 13 are connected to the ground conductor 10 via a short-circuit element 14. Thus, a radio wave received by a dipole element using the strip 12 propagates through the microstrip line 13, is reflected on the tip and it is irradiated again from the dipole elements 12, 12' through the opposite path as the reception path. The phase of the radio wave radiated again is adjusted by changing any of the line length of the metallic strip 13, the shape and size of the radiation strips 12, 12' and the distance between both the strips.