LAUSR

A millimeter-wave dual-polarized beam-scanning SIW phased array is proposed for the 5G communications. The principle of the proposed antenna radiating element is first analyzed with the characteristic mode analysis (CMA) to obtain a wide operating bandwidth. Then, the horizontally and vertically polarized radiations are excited by a differentially-fed substrate integrated waveguide (SIW) cavity and a linearly tapered microstrip line through the coupled slots, respectively. To further validate the proposed design, a 1x4 phased array is fabricated and tested. The experiment results show that the 11.0% overlapped dual-polarization bandwidth is from 25.8 to 28.8 GHz with the return loss larger than 10 dB, and the isolation between the dual-polarization is higher than 31.5 dB. The measured far field patterns demonstrate that the beam-scanning ranges can cover 44 and 41 at 28 GHz for the horizontal and vertical polarization, respectively.