Dual-Band Dual-Linearly Polarized Transmitarray at Ka-Band

Abstract

We present here the design and optimization of a dual-band dual linearly-polarized transmitarray antenna with a 1bit phase resolution (i.e. two phase states with 180° of relative phase-shift). The antenna operates in both downlink and uplink K/Ka-bands (17 - 21 GHz for the lower frequency band, and 27 - 31 GHz for the upper one) and could be used for satellite communication applications. In order to implement dual-band and dual-polarization, the unit-cell consists of four orthogonal superposed U-slotted patch antennas interconnected by a common metallized via hole. A 20×20 transmitarray based on the proposed unit-cell architecture has been optimized by using our in-house tool and validated through full-wave electromagnetic simulations. The 5×5 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> unit-cell size allows beam scanning over a large field of view (up to 80 deg.). A maximum gain of 23.4 and 21.4 dBi has been achieved at 29.1 GHz and 19.5 GHz, respectively. The 1-dB gain bandwidth is greater than 19.8% and 12% at the lower and the upper frequency bands, respectively.