VARIATION OF EFFICIENCIES OF PRINTED ANTENNAS USING SCREENED LOCALIZED STATIC MAGNETIC-FIELDS

The variation of HTS conductivity with static B field is used to modul ate the efficiencies of printed HTS loop antennas at 1 GHz. The genera tion of the necessary high magnetic flux densities is made more practi cal by only requiring that a fraction of the circumference of a loop i s subjected to the B field, thereby enabling the use of much smaller s olenoids which could also benefit from the antenna cooling, RF screeni ng is provided by placing the solenoids behind the groundplanes, and i t is suggested that the idea presented hers could be extrapolated to p roduce stealthy or adaptive printed arrays.