Dual-port traveling-wave frequency-scanned patch array antenna for E-band vehicle sensing and imaging applications

Abstract

An E-band dual-port frequency-scanned traveling-wave array antenna enabled by series-fed microstrip patches was demonstrated in this study. By varying the distance between adjacent radiated elements, the main beam can be adjusted to any desired direction angle. Subsequently, by integrating this mechanism with the traveling-wave array antenna, a frequency-scanned antenna with simple structure is developed, which presents an excellent alternative for E-band sensing and imaging applications. The proposed antenna was constituted by 16 identical series-fed rectangular patches and two input ports with the impedance transition structures between rectangular waveguide and microtrip transmission line. With the two different feeding ports, main beam of the fabricated antenna's radiation pattern can scan from 14° to 22° or -14° to -22° over 75 GHz to 79 GHz.