Murano, K.Watanabe, I.Kasamatsu, A.Suzuki, S.Asada, M.Withayachumnankul, W.Tanaka, T.Monnai, Y.2020-12-102020-12-102017IEEE Transactions on Terahertz Science and Technology, 2017; 7(1):60-692156-342X2156-3446http://hdl.handle.net/2440/129394Date of publication December 1, 2016; date of current version January 12, 2017.We demonstrate short-range terahertz radar based on a leaky-wave antenna with a beam steering capability. As a proof of concept, we develop a microstrip-based periodic leakywave antenna driven by a vector network analyzer. By sweeping the frequency from235 to 325 GHz, beam steering from−23◦ to+15◦ across the broadside can be achieved with a nearly constant beam width of 4◦. Small target detection is demonstrated by locating a metal cylinder with a diameter of 12 mm placed 46–86 mm in front of the antenna with a mean error of 2.4 mm. The use of a leaky-wave antenna can pave the way for developing a low-loss, low-profile, and wide-aperture terahertz radar. Importantly, it can be integrated with a solid-state source and a detector. The proposed approach is particularly promising for use with emerging small devices such as drones or wearable devices, where millimeter-wave radar is not suitable in terms of the resolution and system footprint.en© 2016 IEEEBeam steering; broadside radiation; leakywave antennas (LWA); terahertz radar; waveguide-to-microstrip couplersJournal article003005974210.1109/TTHZ.2016.26245140003963888000092-s2.0-84999098109281159Withayachumnankul, W. [0000-0003-1155-567X]