A 2-bit Programmable Dual Linearly-Polarized Metasurface Structure Element

This paper proposes a novel shared-aperture dual linearly-polarized 2-bit programmable metasurface structure element. Two orthogonally placed dipoles, each equipped with two pin diodes and parasitic patches, are used to realize the 2-bit phase shift in the respective polarization direction. A cross-over structure is introduced into the element to ensure high cross-polarization discrimination (XPD). The reflection coefficients and XPD under the +45 degrees polarized incidence are analyzed. The maximum insertion loss is 2.4 dB and the XPD of the element in the four states is all above 54 dB. The electromagnetic response validates that the element is an excellent candidate for dual-linearly polarized metasurface with high efficiency and little crosstalk.