Low‐profile annular ring‐shaped continuous transverse stub antenna array with two‐dimensional beam scanning

Abstract

AbstractA low profile two‐dimensional beam scanning antenna array formed by annular ring‐shaped continuous transverse stubs (CTS) is proposed. The annular ring‐shaped CTS array is constructed on two substrate layers by the substrate integrated waveguide (SIW) technique and fed by a planar SIW horn, which is located at the center of the antenna array. A 360° azimuth beam scanning could be achieved by rotating the feed SIW horn around the antenna axle, while the elevation beam scanning would be obtained with the frequency‐scanning. This SIW‐CTS array is designed, fabricated, and tested. The measured −10 dB reflection coefficient bandwidth is from 15.2 to 22 GHz (36.5%). The measured main beam scanning range in the elevation is 27.6° with the frequency varying, while the array gain is between 17 and 18.9 dBi.