天线阵发射射频场的力学特性
Mechanical properties of the radio frequency field emitted by an antenna array
摘要：
电磁光束的角动量密度与螺旋度（圆极化）和拓扑荷（方位相移和涡度）有关。通过计算圆形天线阵发射的电磁场，得到了能量密度、线动量密度和角动量密度的解析表达式。它被发现，角动量密度可以分为自旋和轨道部分，结果是已知的是真实的光束几何形状。这些结果对于丰富信息的射电天文学和空间物理学以及新颖的无线电，雷达和无线通信概念具有重要意义。
英文摘要：
Angular momentum densities of electromagnetic beams are connected to helicity (circular polarization) and topological charge (azimuthal phase shift and vorticity). Computing the electromagnetic fields emitted by a circular antenna array, analytic expressions are found for the densities of energy, linear and angular momentum in terms of helicity and vorticity. It is found that the angular momentum density can be separated into spin and orbital parts, a result that is known to be true in a beam geometry. The results are of importance for information-rich radio astronomy and space physics as well as novel radio, radar, and wireless communication concepts.
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