Abstract
In this paper, a dual circularly-polarized multilayer reflective surface (MRS) based on loaded ring-slots for reflectarray applications is presented. The MRS comprises a wideband multilayer circular polarizer cascaded with a multilayer reflective screen with independent phase shifting properties for the two orthogonal linearly polarized components. The first polarization conversion is accomplished by a four-layer polarizer based on periodic arrays of bisected split rings that converts two incident circularly-polarized waves, one left-handed (LHCPW) and other right-handed (RHCPW), into two linearly polarized waves with orthogonal polarization planes. These two waves can be phase-shifted independently by a periodic two-layer array of specially designed reflective elements. Each element consists of a ring-slot resonator loaded with two pairs of reactances orthogonally located that can be varied to obtain two linear reflection phase tapers along the array. These reflected waves are then transformed back by the polarizer into two circularly polarized waves traveling into the desired directions. To validate the proposed approach, a six-layer prototype operating at 32 GHz that provides reflection elevation and azimuthal angles for the RHCPW at 22° and 180°, respectively, and reflection elevation and azimuthal angles for the LHCPW at 18° and 0°, respectively, has been designed, fabricated, and experimentally verified.
Highlights
Nowadays, there is an increasing demand for antenna systems to provide flexibility in terms of radiation pattern and in terms of frequency reconfiguration, polarizationdiversity, and multibeam scanning performance
The possibility to reconfigure each single unit cell based on varying the loading in the ring slot resonators to offer distinct reflection phases, and the study of the super cells that can be obtained to offer linear phase tapers are explored in this work with the aim to provide polarization diversity along with beam scanning properties
A multilayer dual circular-polarized reflective surface based on loaded ring slot resonators has been investigated in this paper
Summary
There is an increasing demand for antenna systems to provide flexibility in terms of radiation pattern and in terms of frequency reconfiguration, polarizationdiversity, and multibeam scanning performance. An approach that provided independent reflection phases for orthogonal CPW was obtained in [19] through a reflectarray unit cell based on a thin polarizer using a modified Jerusalem cross cascaded with. The possibility to reconfigure each single unit cell based on varying the loading in the ring slot resonators to offer distinct reflection phases, and the study of the super cells that can be obtained to offer linear phase tapers are explored in this work with the aim to provide polarization diversity along with beam scanning properties. The proposed approach offers independent control of the reflection coefficient phase for each of the orthogonal circularly polarized components of the incident wave by means of properly adjusting the reactive loading of the ring slots. The proposed MRS approach can be used as a proof of concept for designing reconfigurable reflectarrays with enhanced flexibility in terms of polarization diversity and beamforming capabilities
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