Abstract
This letter presents a double-layer 45° linearly polarized (LP) wideband and highly efficient transmitarray antenna (TA). The proposed element is composed of two multi-resonant dipoles and four metal vias. The dipoles are placed on the diagonal of the unit cell and printed on both sides of the dielectric substrate. The metal vias which penetrate the substrate and connect the upper and lower dipoles are used to improve the transmission efficiency and obtain the large phase shift range of the proposed element. The proposed element realizes a full 360° phase shift range with a smooth slope in the band, and the magnitude loss is less than 1.5 dB at 20 GHz. The proposed TA is designed, manufactured, and measured. The measurement and simulation results are consistent. Measurement results indicate that the proposed TA has a maximum gain of 26.9 dBi at 20 GHz and an aperture efficiency of 53.5% with a 1 dB gain bandwidth of 12% (18.8–21.2 GHz). The proposed double-layer 45° LP TA shows enhanced bandwidth and simple design. Using a double-layer structure opens possibilities for TA design.
Highlights
W ITH the growing concern about communication distance and quality, the reflectarray antenna (RA) and the transmitarray antenna (TA) have received increasing attention because of their advantages of simple structure, high efficiency, low cost and light weight [1]–[3].These planar antennas generally consist of one or multiple feeds and a reradiate array of reflecting or transmitting elements with the capability of independent phase adjustment
Compared with RA design, TA design is more flexible because the TA does not need to consider the entire feeding system blockage and is easy to integrate with the mounting platform
A double-layer 45◦ linearly polarized (LP) wideband and highly efficient TA is presented in this letter
Summary
W ITH the growing concern about communication distance and quality, the reflectarray antenna (RA) and the transmitarray antenna (TA) have received increasing attention because of their advantages of simple structure, high efficiency, low cost and light weight [1]–[3].These planar antennas generally consist of one or multiple feeds and a reradiate array of reflecting or transmitting elements with the capability of independent phase adjustment. In the early literature [11], [12], only about a 180◦ phase shift range is achieved by using a double-layer structure, resulting in non-negligible phase errors and poor aperture efficiency.
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