PLANAR ARRAY ANTENNA AND QUASI-MILLIMETER WAVE/MILLIMETER WAVE WIRELESS COMMUNICATION MODULE

A planar array antenna includes: a radiation section 51 including a plurality of radiation conductors 30 and a first ground conductor layer 20, and a power supply section 52 including a plurality of strip conductors 10 and a second ground conductor layer 60, wherein the strip conductors 10 are arranged so as to correspond to the radiation conductors 30 between the first ground conductor layer 20 and the second ground conductor layer 60; and the first ground conductor layer 20 is located between the radiation conductors 30 and the corresponding strip conductors 10, and includes a plurality of slots 21 extending in a direction that crosses a direction in which the strip conductor 10 extends and a groove or at least one aperture 22 located between adjacent two of the slots 21.