Title :
Examination on power handling capability of superconducting patch antenna
Author :
Ehata, K. ; Ali, M.I. ; Kusunoki, M. ; Ohshima, S.
Author_Institution :
Fac. of Eng., Yamagata Univ., Yonezawa, Japan
fDate :
6/1/1999 12:00:00 AM
Abstract :
Measured results of power handling capability characteristics of superconducting patch antenna and it´s improvement are reported. A direct-fed patch antenna is fabricated by YBa/sub 2/Cu/sub 3/O/sub y/ thin film with 50 nm thickness. The gain of the antenna does not change with the applied power up to 26.3 dBm at 12.3 K, but drop of the gain is observed more than 26.5 dBm. It is found by electromagnetic analysis that this gain drop occurs due to huge current concentration in the direct-fed patch. However, this current concentration can be reduced using the gap-coupled feed, and breakdown power is expected to be three times larger than that of direct feed.
Keywords :
barium compounds; high-temperature superconductors; microstrip antennas; superconducting microwave devices; superconducting thin films; yttrium compounds; 12.3 K; YBa/sub 2/Cu/sub 3/O; YBa/sub 2/Cu/sub 3/O/sub y/ thin film; breakdown power; current density distribution; direct feed; electromagnetic analysis; gain; gap-coupled feed; power handling; superconducting patch antenna; Feeds; Impedance; Patch antennas; Power transmission lines; Superconducting device noise; Superconducting films; Superconducting filters; Superconducting microwave devices; Superconducting transmission lines; Transmission line antennas;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
