Abstract
A dual-mode circular polarization selective surface (CPSS) cell based on a modification of the Pierrot cell is presented for single-layer dual-band circularly polarized (CP) reflectarray antenna design. To achieve dual-mode CP discrimination performance, the improved three-dimensional geometry and the high-order resonances of the CPSS cell are utilized. The required phase shifts in both modes are obtained by varying the cell rotation angle. A single-layer dual-band reflectarray operating with orthogonal CPs has been fabricated and tested. Measured results show the peak gains of 25.2 dBi at 11.6 GHz with 31% 3 dB axial ratio (AR) bandwidth and 26.5 dBi at 14.6 GHz with 32% 3 dB AR bandwidth, respectively. The measured efficiency is 41.2% at 11.6 GHz and 55.5% at 14.6 GHz.
Highlights
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
Mode 2 resonates under RHCP incidence with two current nulls, operating over the frequency range 11.8–12.7 GHz (SR11R>−1 dB, SL21L>−1 2 dB), and the axial ratios (ARs) are less than 2.1 dB in both reflection and transmission cases; mode 3 resonates under LHCP incidence with three current nulls, operating over the frequency range 14.9–15.8 GHz (SL11L>−1 dB, SR21R>−1 4 dB), and ARs are less than 4.9 dB in both cases
righthanded CPSS (RHCPSS) is displayed in mode 2, and left-handed CPSS (LHCPSS) is displayed in mode 3
Summary
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. There are few researches on single-resonator multiresonance cell for CP reflectarray, which could simultaneously achieve simplification structure and multiband capability. 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. In this Pierrot design, the cell is a 1λ-long metallic wire folded into three segments, where the 3λ/8-long transverse orthogonal segments are separated λ/4 in longitudinal direction by the vertical segment. A compact dual-mode CPSS cell is proposed, which could be used in single-layer dual-band CP reflectarray design. A dual-band reflectarray in orthogonal CP waves based on the proposed cell is presented, together with the performance assessments in simulations and measurements
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