Use of superconductivity to reduce the size of an ultradirectional emitter
Abstract
Aspects of the design of compact, superconducting emitters are considered. The smallest acceptable emitter efficiency is determined for the cases of an uncooled antenna and an ordinary receiver and a cooled antenna in a lownoise receiver. The equation for the Qfactor determined by the emitter resistance for the case of maximum antenna gain is presented for an idealized model of an ultradirectional circular array containing an even number of elementary electric oscillators oriented parallel to one another and arranged symmetrically on the circumference of a circle. Factors by which the dimensions of the emitter can be reduced under a number of different conditions are shown. How these estimates can be extended to the case of a linear ultradirectional array is described.
 Publication:

Zhurnal Tekhnicheskoi Fiziki
 Pub Date:
 March 1983
 Bibcode:
 1983ZhTFi..53..556V
 Keywords:

 Antenna Design;
 Directional Antennas;
 Emitters;
 Superconductivity;
 Antenna Arrays;
 Figure Of Merit;
 Power Gain;
 Electronics and Electrical Engineering