| 摘要 |
<p>A communications system (10 and 12) in which a communications channel is defined at least in part by an electromagnetic wave (78) having a carrier frequency and an electric field vector, the extremity or terminus of which traces a non-linear periodic path at a rotation frequency less than the carrier frequency and greater than zero from the perspective of an observer looking into the axis of propagation of the wave. The transmitter (10) of the communications system launches a wave (78) having such characteristics and modulated with information in a suitable manner. The receiver (12) of the communications system is sensitive to the periodic path and rotation frequency. The combination of the periodic path and the carrier frequency provides selectivity that can be used to define multiple communications channels.</p> |
