Multifunctional Microstrip Array Combining a Linear Polarizer and Focusing Metasurface

摘要: Although microstrip reflectarrays/transmitarrays have been extensively studied in the past decades, most previous designs were confined to monofunctional operations based on either transmission or reflection. In this communication, we propose a scheme design multifunctional arrays that can simultaneously exhibit functionalities of reflectarray and transmitarray basis appealing feature polarizer discovered (i.e., constant phase difference between its cross-polarization copolarization reflection within broadband). To demonstrate proposed scheme, designed fabricated device comprising $15 \times 15$ array twisted complementary dual-split ring resonators, each carefully desired satisfying parabolic distribution. Feeding by Vivaldi antenna at focus, numerically experimentally demonstrated our system functioned as directive emitter working transmission/reflection mode for cross-polarization/copolarization radiation low/high frequencies, it radiate directively both directions with different polarizations intermediate frequencies. The half-power beamwidth was $\sim 15^{\circ }$ , which is 40° narrower than bare antenna. Moreover, gain higher 13 dB all cases studied, least 7