Dual-Polarized Folded Reflectarray Antenna With Active Components
Manting Wang, Man To Yim, Chi Hou Chan
Abstract
This study demonstrates a novel dual-polarized folded reflectarray (DP-FRA) integrated with active components. Conventional FRA consists of three parts: the upper single polarizer grid that lets only a single polarized wave transmit while reflecting the orthogonal one; the bottom metasurface that can convert the <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</i> -( <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">y</i> -) into <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">y</i> -( <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</i> -) polarized wave, at the same time, compensating the phase due to the path difference from the antenna source; and a feeding source. For the proposed DP-FRA, the upper metasurface unit is composed of three metal layers. The top and bottom metal patches are the same, each integrated with two PIN diodes, one along the x and another along the y-direction. A metal patch with a crossed slot is developed in the middle for transmission efficiency improvement. A magnetoelectric dipole is designed as the dual-polarized feeding source. The final FRA can achieve a maximum gain of 16.4 dBi, 30% aperture efficiency, and work for dual-polarization operation. It provides a good platform for multifunctional integration.