A Metasurface Omnidirectional Antenna Design Using CMA

A probe-fed broadband vertically polarized metasurface antenna with omnidirectional radiation is presented in this paper. The omnidirectional antenna combined with the metasurface can well make up for the shortcomings of the traditional microstrip antenna with a high Q value and a narrow frequency band. The profile of the antenna is very low due to its single-layer structure. The antenna is composed of 16 square patches with twelve outer patches slightly smaller than the inner ones. In order to improve impedance matching, a small circular patch is added to the center of the antenna to offset the inductivity introduced by the feeding probe. The overall size of the antenna is 55mm $\times55$ mm $\times4$ mm. The simulation results show that the bandwidth of the proposed metasurface antenna is as high as 52.3% (5.57–9.51 GHz) with maximum gain of 6.5 dB.