Antenna substrate used interrogator antenna of identification of friend or foe

摘要

The present invention relates to an antenna substrate for an interrogator antenna for a friend or foe identification device. The antenna substrate for an interrogator antenna for a friend or foe identification device capable of suppressing a minor lobe of a sum signal with a difference signal comprises: a sum signal antenna unit; and a difference signal antenna unit provided at one side of the sum signal antenna unit. The sum signal antenna unit and the difference signal antenna unit include a plurality of micro strip patch antennas respectively formed on first and second insulating layers and a circular plate antenna.