Waveguide-Fed Cavity Backed Slot Antenna Array with high efficiency in the Ku-band

This paper reports the design of a Waveguide-Fed Cavity Backed Slot Antenna Array in Ku-band. The antenna is made entire via simple milling process. The overall antenna structure consists of 3 layers. The bottom layer is a waveguide feed network to provide corporate power division. In turn, the waveguide feed network is fed by a conventional SMA connector from the back. The waveguide network couples energy to an array of cavity via an aperture. This constitutes the middle layer. Each cavity then excites an array of 2×2 radiating slots in the top layer. The radiating slot elements and the feed network are designed to achieve wide bandwidth and gain performance. Finally, an 8×8 array antenna is designed with about 25dBi gain and bandwidth of 1.6GHz in the Ku-band.