Dual-Band, Dual-Linearly Polarized Transmitarrays for SATCOM Applications at Ka-Band

Abstract

We propose here a 4040-element sharedaperture dual-band dual linearly-polarized transmitarray with 1-bit phase resolution and fixed beam at Ka-band. The design is based on a stacked approach where the unit-cell size is compact and is equal to only 0.48×0 and 0.32×0 at 29 GHz and 19 GHz, respectively. The beam-scanning performances of this array are compared to those of an array with the same number of elements and same illumination but comprising unit-cells based on the interleaving approach (lattice size of 0.72×0 and 0.47×0, respectively). The shared-aperture unitcells include four printed U-slotted patch antennas and a connecting metallized via; the desired 180° phase shift is obtained by rotating one of the patches around its corresponding via. Our simulation results demonstrate that the transmitarray based on the stacked approach exhibits excellent beam scanning performance up to ± 70° on the two bands. A prototype pointing at broadside has been optimized and fabricated to validate the numerical simulations.

A Design Method of Compact Metasurface-based Dual-band Planar Lens Antennas for Multibeam Applications

“…Most of the researches focus on dual-band lens antennas with fixed beam [13][14][15][16]. Some studies have considered dual-band beam scanning by offsetting the feed from the focus or rotatable transmitarray [17,18]. The dual-band rotatable transmitarrays are also proposed for dual-band beam scanning [19,20].…”