A Compact Metasurface Antenna Array With Diverse Polarizations

In this letter, a compact metasurface antenna array with diverse polarizations is proposed. The array element is a dual-polarized metasurface antenna driven with a square patch. In order to have compact size and low sidelobes for the antenna array, shared radiating elements are applied for both polarizations with a size reduction of 18.8% for a 1 × 4 antenna array. The diverse polarization property is achieved with the method of maximum power transmission efficiency (MMPTE), in which a dual-feed patch antenna connected to an ideal power combiner is chosen as the receiving antenna. With different scattering matrices of the power combiner, it is easy to calculate the excitation distribution for any polarizations with maximum gain. For demonstration, the antenna array with diverse polarizations is designed, fabricated, and measured.