Wideband and Wide-Beam ±45° Dual-Polarized Microstrip Patch Antenna

To improve the beamwidth of the microstrip antenna with improved bandwidth, this article is improved and based on distributed microstrip antenna. Firstly, the differential feeding scheme is used to excite the patches on the diagonals, and the double-layer patches are used to expand the impedance bandwidth. Hence, the addition resonance is introduced on the feed line so as to improve the impedance matching. As such, the frequency range where the return loss of the antenna is better than -10dB is ranging from 790 to 960 MHz (19.4%), which can cover low-frequency 5G communication bands: n5 (824MHz-894MHz), n8 (880MHz-960MHz), and n20 (791MHz-862MHz). Meanwhile, the antenna achieved a half-power beamwidth (HPBW) of more than 100° in the E-plane and more than 110° in the H-plane.