A Broadband Dual-Polarized Metasurface Antenna for 5G mmWave Communication Using Characteristic Mode Analysis

In order to meet the needs of 5G millimeter wave communication, this paper proposes a broadband dual-polarized antenna applied in 5G millimeter wave frequency band. The antenna adopts double-layer patch structure, and the upper patch uses
$2\times 2$
metasurface to realize broadband effect, where CMA theory is used to analysze this double-layer patch structure. Proposed antenna is fed by a slot coupling feed structure. By designing the coupling slot and adopting an air cavity structure, the bandwidth of the antenna is widened. Simulation results show that the -10 dB bandwidth of the antenna at the two ports is 26.25-40.83 GHz and 25.91-41.05 GHz, respectively. Within the working bandwidth, a good port isolation of greater than 21 dB is achieved, and the antenna gain is between 4.9 dBi and 6.7 dBi. The antenna has the advantage of low profile with the size of
$0.56\lambda _{0}\times 0.56\lambda_{0}\times 0.13\lambda_{0}$
.