Method and apparatus for transmitting radio wave by rotating pla

Communications: directive radio wave systems and devices (e.g. – Directive – Including polarized signal communication transmitter or...

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342162, 455501, 455504, 455 63, H01Q 2106, H04B 110, H04B 701

Patent

active

060610204

ABSTRACT:
At a transmitting end, first and second dipole antennas are crossed each other by right angles and are arranged in a plane perpendicular to a propagating direction of radio wave. In first and second balanced modulators, a carrier signal is modulated with respective modulation signals having a phase difference of 90.degree. to produce balanced-modulated signals, which are then supplied to the first and second dipole antennas, respectively. Then a plane of polarization of a composite vector of radio waves transmitted by the dipole antennas is rotated at a frequency of the modulation signals, said frequency being higher than a fading frequency. The modulation signals are controlled by a state of a digital signal to be transmitted. At a receiving end, the digital signal is reproduced by receiving the transmitted radio wave by a conventional single side band receiver.

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