A Highly Efficient Compact High Gain RFID Tag Antenna for Millimeter Wave Applications

A planar wide beam slotted RFID tag antenna operating at 24.3 GHz is developed on a low-cost FR4 substrate with reduced dimensions (4.87×4.87 mm). The proposed tag antenna includes a slot to facilitate miniaturization and offer a wider beamwidth with a high gain (4.9 dBi). Additionally, the proposed tag antenna has a wider bandwidth (4.65 GHz) to enhance the proposed system's capacity. The suggested tag antenna has a beamwidth of 121° in the ϕ = 90° plane, which offers maximum coverage. The antenna prototype is developed on FR4 substrate, and the simulation and measurement findings for the proposed tag antenna correspond adequately.