Abstract
A wideband folded reflectarray antenna (FRA) based on single-layered polarization rotating metasurface (PRM) is proposed. The FRA is composed of a wideband polarization grid (PG), a wideband PRM and a wideband circular waveguide as the primary source. First, a wideband polarization rotating unit cell consisting of rhombus-shaped metal patch etched on dielectric substrate is designed, which can be used to rotate polarization of the reflective wave 90° relative to that of the incident wave. The element and its mirror image can provide 0°, 90°, 180° and 270° phase shifts with 2-bit phase quantization and relatively higher polarization conversion rates in the Ku band. Due to the introduction of PG and PRM, the distance between the PG surface and the feed phase center can be reduced to about 1/2 of the distance between the imaginary feed and PRM reflectarray. Finally, a wideband FRA consisting of 315 elements with circular aperture is designed, fabricated and measured. The measured results indicate that the proposed antenna achieves 39.5% 3-dB gain bandwidth with 25.5 dBi peak gain at 15 GHz. Its maximum aperture efficiency is about 40%. Low-profile and wideband features of the FRA make it be a candidate in the wireless communication systems.
Highlights
High-gain antennas have been playing an extremely significant role in many fields such as satellite communications, radar detection and radio astronomy
The spherical LP wave emitted by the feed is first reflected by the polarization grid (PG), and reflected with 90◦ polarization twist by the polarization rotating metasurface (PRM) reflectarray at the same time, providing phase-shifting compensation, producing its orthogonal LP wave
A novel wideband folded reflectarray antenna (FRA) based on the single-layered polarization rotating metasurface is presented
Summary
High-gain antennas have been playing an extremely significant role in many fields such as satellite communications, radar detection and radio astronomy. The reflectarray antennas have been made great progress in their performance improvements such as wide bands, multiple polarizations and high gains. Their profiles are much higher, which limit their application areas. It is generally known that the reflectarray antenna has the inherent defect of narrow band, which seriously restricts their application areas To address this problem, many new approaches for broadening bandwidths of the FRA are proposed. The PRM reflectarray contains only single-layer substrate and metal patch and leads to reduce the cost of the proposed FRA. The electromagnetic performance of this element is analyzed by Ansys HFSS software under Floquet periodic boundary conditions
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