Gain Enhancement of a Base Station Antenna with Transmitting Metasurfaces

A gain enhanced base station antenna element with transmitting metasurfaces is proposed in the paper. Based on the conventional dipole patch antenna, the 2-layer metasurfaces with cross bow-tie are introduced for gain improvement, and also satisfy the boundary limitation of the original antenna. The magnitude and phase of the E-fields at the radiating aperture are more uniform by tuning the geometry of the unit cell of the metasurfaces, and hence higher gain is realized. The simulation shows that the metasurfaces effectively improve the gain by more than 1 dB within 5150~5850 MHz, and the radiation patterns of the proposed antenna remain stable.