Transparent mm-Wave Array on a Glass Substrate with Surface Wave Reduction

In this paper, a transparent dual-element millimeter-wave (mm-wave) array for handsets is proposed. The antenna is mounted on top of a glass display and it is made by diamond grid cells that provide a transparency of 86 %. In order to reduce the surface waves generated and make the radiation pattern more directive, several rows of meshed patches have been placed in front of the mm-wave bow-tie array. The antenna array operates from 26.5 to 29.5 GHz and has a total efficiency of more than 70 % in the operating bandwidth. The array is able to steer the beam 70 degrees with a realized gain higher than 7 dBi.