Antenna substrate used interrogator antenna of identification of friend or foe

摘要

The present invention presents an antenna substrate for an interrogator antenna of identification friend or foe equipment with a dielectric constant of 1-10, comprising: first and second insulating layers; a plurality of microstrip patch antennas formed on the first insulating layer; and a plurality of circular plate antennas formed on the second insulating layer. Therefore, the antenna substrate for an interrogator antenna of identification friend or foe equipment can suppress a minor lobe of a sum signal with a difference signal.