Radioholographic antenna for ionospheric retranslation in broadcasting and communication systems

The concept of passive or active retranslation of RF signals by means of a radioholographic antenna (RHA) is presented. The chosen domain of the atmosphere (at 30-70 km altitude) is illuminated from the Earth by a powerful microwave electromagnetic field. This field has special spectrum and space distributions, providing in the volume near to the selected point in atmosphere the following factors: (1) artificial ionized plasma generation; 2) stabilization of the generated plasma by the way of its organization into the most energetically stable form (plasmoid) by means of the plasma-supplying series of microwave impulses; (3) projection of the radioholographic image onto the plasmoid, so that the last be able to receive RF signals, coming from the preset direction and retransmit them to the prescribed direction. During the useful signals retransmission, the separation of some part of the RHA power is possible, i.e. the parametric amplification of the retranslated signals may take place