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Updated: May 30, 2025

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
Published on: June 7, 2019
Transmission-type 2-bit coding polarization conversion metasurface with radiation characteristic
Abstract:
A transmission-type 2-bit coding polarization conversion metasurface with radiation function is proposed in this paper. Polarization conversion is realized by two layers of grating structure and polarization conversion structure layer. Compared with conventional polarization conversion metasurface which is composed of two orthogonal grating layers and polarization conversion arrows, the two grating layers of the proposed design are parallel. With the help of such well-designed parallel grating, spoof surface plasmon polaritons (SSPPs) can propagate through the surface of the metasurface. The efficiency of polarization conversion is almost unchanged at the same time. That is, when modulating the surface impedance periodically by tuning the structure parameters of the grating, SSPPs can be radiated into free space but the transmitted polarization conversion beam is not affected. Radiation characteristic exhibits during the frequency range of 2.7-4.7 GHz, while polarization conversion of transmission wave is realized at 6.2 GHz. The total scanning angle of the radiated beam covers from -36° to 41°, with an average gain of 10.0 dBi. The transmission efficiency of polarization conversion reaches 90%. Such multifunctional transmission-type coding metasurface shows great potential in the believed to be new radar and satellite communication systems with compact requirement.
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