W-Band Waveguide Slot Array Antenna with High Gain Based on Rectangular Micro-Coaxial Process

This paper presents a W-band waveguide slot array antenna based on rectangular micro-coaxial process. To reduce the overall dimension of the array antenna and facilitate testing, the CPW interface is used for excitation. And a broadband CPW to waveguide transition is designed. The overall dimension of the array antenna is 17.85 mm × 7.4 mm × 0.5 mm. The bandwidth is around 8.7 GHz (96.1-104.8 GHz) and the simulated realized gain is up to 18 dBi.