Dual Circularly Polarized Reflectarray With Independent Control of Polarizations

Abstract

A reflectarray with independent dual-circular polarizations is proposed for the first time. The reflector panel operates in X-band and contains 97 unit-cells. It is made with a lego-type configuration allowing changing manually the phase aperture distribution and demonstrating experimentally the independence of both polarizations in the same frequency band. To this end, various beam pointing directions are selected in righthand and left-hand polarizations. The achieved bandwidth is 790 MHz (9.4% at the center frequency 8.37 GHz) for an axial ratio lower than 3.5 dB with 1.5 dB gain variations.Index Terms-Dual-polarized passive reflectarray, Dualcircular polarizations.

Dual-Mode Circular Polarization Selective Surface Cell for Single-Layer Dual-Band Circularly Polarized Reflectarray

“…Reflectarrays in multifunction integration such as multiband [1,2] and multipolarization [3,4] are in urgent needs for space communication with advantages in high capacity and low cost. Meanwhile, antenna operating in circular polarization (CP) is advantageous for extreme environments since it eliminates the polarization mismatch and restrains multipath interference.…”

“…The single-layer multiresonance broadband CP reflectarray has been proposed reaching more than 30% antenna bandwidth in [6]. The dual-CP reflectarray with independent control in the identical frequency was firstly researched in [3] based on the circular polarization selective surface (CPSS) cell.…”

“…CPSS filtering orthogonal CP waves could be used in polarization converter and other CP managements in single aperture [11]. Dual-CP reflectarray using the reconfigurable CPSS cell was studied by Mener et al in [3,12], which has been the sole form for CPSS's application to multifunction reflectarray design so far. Otherwise, the multimode CPSS with more stringent requirements has not been used, since that no simple electromagnetic structure achieving multimode CP discriminations has been known.…”

Circularly polarized 2 × 2 microstrip antenna array for application as a reflectarray feed

“…The polarization performance of circularly polarized reflectarrays depends critically on the polarization purity of the feed. 1 Due to well-known advantages, such as, small size, light weight, compactness, and low cost, microstrip arrays can be used in satellite-based communication systems as reflectarray feeds. However, they are also known to exhibit narrow axial ratio and impedance bandwidths.…”

Multibeam Dual-Circularly Polarized Reflectarray for Connected and Autonomous Vehicles

“…In [20], a dual-CP reflectarray is obtained by using a dual-surface reflector and polarizer which converts the LP waves to CP waves. One dual-CP reflectarray that can steer its beam to 21 o with independent control was reported in [21]. In this design, Dual-CP operation was achieved by placing one left-hand circular polarization (LHCP) and one right-hand circular polarization (RHCP) selective surfaces at different layers separated by an air gap, which results in a complicated structure and high profile.…”