基于涡旋电磁波的大容量通信系统设计

Design of Large-capacity Communication System Based on Vortex Electromagnetic Waves

摘要:

鉴于涡旋电磁波所体现出的独特空间电磁场分布特征,以及其携带的轨道角动量在理论上所具有的无穷维度模态正交特性,涡旋电磁波在无线通信领域和雷达探测与成像领域均表现出重要的研究价值和应用潜力；通过涡旋电磁波空间电磁场的分布和原理入手,采用在C波段设计阵元交替排布的双圆环均分天线阵列,并基于带状线屏蔽性能强的优势设计4路1分8的叠层馈电网络,从而产生4种混合模态(+1,-1,+2,-2)的涡旋天馈系统；通过搭建混合模态涡旋电磁波大容量通信系统测试收发天馈之间模态隔离度大于15dB,在此基础上加入软件无线电平台验证通信系统多路涡旋波信号传输特性,测试验证4个端口均可正确接收、解调电磁信号,实现频谱效率4倍的提升。

Abstract:

In view of the unique spatial electromagnetic field distribution characteristics embodied by vortex electromagnetic waves and the theoretical orthogonal characteristics of infinite dimensional modes of orbital angular momentum carried by them, vortex electromagnetic waves show important research value and application potential in the field of wireless communication and radar detection and imaging. Starting from the distribution and principle of the spatial electromagnetic field of vortex electromagnetic waves, a double ring equalization antenna array with alternating array elements arranged in the C-band is designed, and a 4-channel 1-minute 8 stacked feed network is designed based on the advantages of strong stripline shielding performance, so as to produce a vortex antenna feeder system with four mixed modes (+1,-1,+2,-2). By building a hybrid modal vortex electromagnetic wave large-capacity communication system to test the modal isolation between the sending and receiving antenna feeders is greater than 15dB, on this basis, a software defined radio platform is added to verify the transmission characteristics of the multi-channel vortex wave signal of the communication system, and the test verifies that all four ports can correctly receive and demodulate electromagnetic signals, so as to achieve a 4-fold improvement in spectral efficiency.