Angular momenta in fields from a rotational mechanical antenna‡

Mechanic antennas provide opportunities for human portable, VLF communications, where a rotational dipole emits EM signals with angular momenta. In this paper we analytically derive the electromagnetic fields from electric using Fourier transform method, and find that radiated carries nonzero energy flow density in both orbital spin momentum (AM) parts by AM flux tensors. Intuitively, rotation of induces longitudinal circulating direction. And binding force is then shown to result mainly Coulomb fields. We believe our work can novel communication designs portable mechanic antennas.