Abstract
This paper investigates a high gain THz beam scanning antenna with a wide scanning range. Two parabolic cylindrical reflectors and a horn feeder is used to obtain a high radiation gain, and a metallic mirror is used to achieve the beam scanning. One computer-controlled motor is used to rotate the mirror for achieving the beam-scanning performance. A prototype is designed with a center frequency of 400 GHz, fabricated by using low cost commercial metal milling technology, and measured by using the vector network analyzer in the THz chamber. Experiments shows the fabricated antenna has a reflection coefficient S11 below −15 dB with a wide frequency band from 325 to 500 GHz. The antenna can scan from −55 to 60 degrees in the H-plane direction. The measured gain is higher than 35 dBi over within 360–500 GHz.
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