In this letter, a broadband 1 bit reconfigurable transmitarray antenna (RTA) based on polarization rotation element is proposed. The transmitarray element is composed of two split circular rings connected by two narrow strips and sandwiched by two orthogonal polarizers. As phase shift and polarization conversion structure, the two patches are separated by the air layer, and the p-i-n diodes are soldered in the center of the narrow strips. The polarizer grids are used as dc bias lines to conduct p-i-n diodes. By controlling the p-i-n diodes in the on and off states, the polarization orientation of the wave emitted by the RTA element is changed. Then, the outgoing waves in the two states physically form a broadband 180° phase difference, which broadens the operating bandwidth of the RTA effectively. By utilizing the novel unit cell, a 16 × 16 elements RTA is designed, fabricated, and measured. The measured results show that the 3 dB and 1 dB gain bandwidths are 45% and 17%, respectively. The peak gain is 16.8 dBi with aperture efficiency of 18.4%. Furthermore, the proposed RTA has good beam scanning performance with 2-D scanning range of ±40°.

中文翻译：

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基于极化旋转元件的宽带1比特可重构发射阵列天线

在本文中，提出了一种基于极化旋转元件的宽带1位可重构发射阵列天线（RTA）。发射阵列元件由两个分开的圆环组成，这些圆环由两个窄条连接，并被两个正交偏振片夹在中间。作为相移和极化转换结构，两个贴片被空气层隔开，并且在窄条的中心焊接了pin二极管。偏光板栅格用作直流偏置线，以导通pin二极管。通过控制上 和 离开状态下，RTA元件发出的波的偏振方向发生了变化。然后，两种状态下的输出波在物理上形成宽带180°相位差，从而有效地拓​​宽了RTA的工作带宽。通过使用这种新颖的晶胞，可以设计，制造和测量16×16元素的RTA。测量结果表明，3 dB和1 dB的增益带宽分别为45％和17％。峰值增益为16.8 dBi，孔径效率为18.4％。此外，所提出的RTA具有良好的光束扫描性能，二维扫描范围为±40°。