Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 56, Issue 47, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-6463/acf141
Keywords
metasurface; dual circular polarization; multi-beam; receiver-transmitter; transmitarray antenna
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This paper proposes a novel metasurface (MS) and a generalized dual-circular-polarized (CP) decoupled modulating method. The MS can achieve high-efficiency dual-spin transmissions with equal-magnitude under left-handed circular polarization (LCP) incidence across 9-12.5 GHz. By rotating the receiver and transmitter patches separately, totally decoupled and dispersion-less phase modulations for transmitted dual-spin waves can be obtained. The proposed wideband and high-gain dual-CP multi-beam transmitarray antennas (TAs) have promising prospects for various applications.
In this paper, a novel metasurface (MS) as well as a generalized dual-circular-polarized (CP) decoupled modulating method are proposed. The proposed MS can realize high-efficiency dual-spin transmissions with equal-magnitude upon left handed circular polarization (LCP) incidence across 9-12.5 GHz. This MS is constructed based on the receiver-transmitter configuration, and the receiver layer composed of an LCP patch resonator while the transmitter layer is a linearly polarized patch resonator. Rotating the receiver and transmitter patches separately can impose identical and conjugated geometric phase modulations for the dual-CP transmission waves, respectively. Hence, through an elaborate combination of the dual geometric phases, totally decoupled and dispersion-less phase modulations for transmitted dual-spin waves can be obtained. As the proof of its uses in practical applications, we have designed a single-feed dual-CP dual-beam transmitarray antenna (TA) and a dual-CP quad-beam TA. The second TA is also fabricated and tested. The measured results are consistent with the simulated results, showing that the TA achieves peak aperture efficiency of 49% at 9.5 GHz, with 1 dB gain bandwidths (BWs) of the dual-CP quad-beams all larger than 24.5% while 3 dB axial ratio BWs all larger than 54.5%. The proposed wideband and high-gain dual-CP multi-beam TAs may have promising prospects for many applications such as vehicle-satellite communication systems, satellite broadcasting and coverage systems.
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