(1.China Academy of Launch Vehicle Technology,, Beijing 100076, China,; 2.School of Electronic Engineering,, Xidian University, Xi′an 710071,, China)
Abstract: The orthogonality of different orbital angular momentum (OAM) modes of vortex electromagnetic wave can be used as a new dimension of information muti-use freedom to further improve the communication capacity. A vortex electromagnetic antenna system based on double uniform circular array is designed, which can generate ± 1 and ± 2 four mode vortex electromagnetic signals at the same time. The results of anechoic chamber test and system test show that the designed antenna system has well isolation between different modes, completes the data transmission of four BPSK signals without error code, and achieves significant improvement of system communication capacity.
Key words : vortex electromagnetic wave,;hybrid mode;antenna system