Design and characterization of a differential microstrip patch antenna array at 122 GHz

This paper presents a differential microstrip patch antenna array that operates at 122 GHz and is suitable for radar applications. The differential line was chosen in the proposed antenna due to the differential radar transceiver. The microstrip patch antenna array was designed to achieve a higher gain and bandwidth compared to a single element antenna. An 8-element series-fed array was designed, fabricated and measured. The 8-element array provides an impedance bandwidth of 14 GHz and a gain of around 13.74dBi at 122 GHz. These measurement results are also in good agreement with the simulation results.