Title :
Characterization of planar log-periodic antennas at low temperatures using Josephson junctions
Author :
Chen, Jian ; Kobayashi, Eeisuke ; Ima, Kensuke Nakaj ; Yamashita, Tsutomu ; Zmuidzinas, Jonas
Author_Institution :
Res. Inst. of Electr. Commun., Tohoku Univ., Sendai, Japan
fDate :
11/1/1999 12:00:00 AM
Abstract :
Using the Josephson oscillations of high-temperature superconducting (HTS) grain boundary Josephson junctions (GBJJs), we have characterized HTS planar log-periodic antennas from 4.2 K to the critical temperature of the GBJJs. The antennas were designed to operate from 25 GHz to 3.2 THz for a broadband receiver. As a result, several resonant steps were obtained in the dynamic resistance (dY/dI)-voltage (V) curves and the steps can be quite well explained by geometric resonances of the antenna
Keywords :
barium compounds; grain boundaries; high-temperature superconductors; log periodic antennas; millimetre wave antenna arrays; planar antenna arrays; submillimetre wave antennas; superconducting junction devices; superconducting microwave devices; yttrium compounds; 25 GHz to 3.2 THz; 4.2 to 70 K; HTSC; Josephson junctions; Josephson oscillations; YBa2Cu3O7; YBaCuO; antenna operating range; broadband receiver; dynamic resistance-voltage curves; geometric resonances; high-temperature superconducting grain boundary Josephson junctions; low temperatures; planar log-periodic antennas; resonant steps; Broadband antennas; High temperature superconductors; Josephson junctions; Log periodic antennas; Optical microscopy; Optical receivers; Receiving antennas; Superconducting devices; Voltage; Yttrium barium copper oxide;
Conference_Titel :
Microwave Conference, 1999 Asia Pacific
Print_ISBN :
0-7803-5761-2
DOI :
10.1109/APMC.1999.829870
