A Design of OAM Metal-only Transmitarray Antenna Using High-Transmission Slot-Type Jerusalem Elements

摘要

In this paper, an orbital angular momentum transmitarray antenna based on high-transmission slot-type Jerusalem elements is proposed. The equivalent circuit model of the proposed element is analyzed by the transmission line theory. Theoretical results calculated by MATLAB show that a four-layer element with non-identical layers can realize a similar phase range and a much higher transmission efficiency as that with identical layers. Using this method, the transmission magnitude is greater than -0.45 dB within a 360 degrees transmission phase range. Based on the proposed element, a round aperture orbital angular momentum transmitarray composed of 648 elements is designed and simulated by HFSS. The results confirm that orbital angular momentum waves with l=+1 are successfully generated. The divergence angle and maximum gain are about 6 degrees and 19.2 dBic, respectively. And the aperture efficiency with l=+1 is 11.3%.