A modular 100-GHz high-gain scalar corrugated nonbonded platelet antenna

A compact 100-GHz corrugated platelet array antenna has been developed based on a corrugated feed design for the background emission anisotropy scanning telescope (BEAST). The antenna results in a gain of 20 dB, and a bandwidth across the full range of W-band 75-110 GHz. The sidelobes are down by about - 25 dB, a requirement comparable to feed horns used for observation of the cosmic microwave background. The design and fabrication presented in this paper is straightforward and inexpensive. A feature is that because the plates are not permanently bonded, the horn can be disassembled and modified to change its properties.