High High-Gain Dual-Band Transmitarray
Abstract: We propose a novel linearly polarized, dual dual-band, and high--gain transmitarray based on multilayer frequency-selective frequency selective surface structures. This is the first time for actualizing a dual-band band transmitarray with more than 50% aperture efficiency. The unit cell is composed of four metallic layers without dielectric substrates between every two layers, which results in good match, low insertion loss, and high radiation efficiency. We introduce two kinds of rectangular rectangular slots in the design to control the magnitude and phase range of transmission coefficients in the two designed frequency bands through changing the slot length. The isolation between two bands is excellent and the interference can be ignored. The induced i electric fields of the cell are also investigated in order to elucidate the working principle intuitionally. The proposed dual dual-band band transmitarray with a square aperture ( 240×240 mm 2 ) is designed, fabricated, and measured. A linearly polarized corrugated rugated horn antenna is adopted to improve the aperture efficiency and ensure the similarity of the radiation patterns on E-plane E plane and H H-plane. Fullwave simulation and experimental results have very good agreements. It is demonstrated that the dual dual-band transmitarray ansmitarray works in two frequency bands 11.8–12.2 and 17.5–18.1 18.1 GHz simultaneously, and the peak gains in the designed central frequencies 12 and 18 GHz are 27.8 and 31.4 dB, respectively, which correspond to the aperture efficiencies (global efficiencies efficiencies)) of 52% and 53%. The