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

Volume

2

fYear

1999

fDate

11/1/1999 12:00:00 AM

Firstpage

348

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 1999 Asia Pacific

Print_ISBN

0-7803-5761-2

Type

conf

DOI

10.1109/APMC.1999.829870

Filename

829870