Millimeter-wave sensitivity of YBCO grain boundary Josephson junctions coupled with coplanar waveguide-fed slot dipole antennas

Author

Nakajima, Kensuke ; Ebisawa, Norikazu ; Sato, Hiroyasu ; Chen, Jian ; Yamashita, Tsutomu ; Sawaya, Yukio

Author_Institution

Fac. of Sci. & Eng., Hirosaki Univ., Japan

Volume

15

Issue

2

fYear

2005

fDate

6/1/2005 12:00:00 AM

Firstpage

549

Lastpage

551

Abstract

Improvements in the coupling efficiency of millimeter wave quasioptically introduced to high-T_C Josephson junction detectors have been studied. Both increasing of junction resistance and implementation of a lower impedance antenna are required to improve the efficiency. We designed a coplanar waveguide feed slot dipole antenna as a low impedance antenna combined with the Josephson junction detectors. Improvements in the coupling efficiency due to decreasing of antenna impedance have been demonstrated and compared with numerically obtained results by the finite difference time domain method on the slot dipole antenna.

Keywords

dipole antennas; finite difference time-domain analysis; millimetre wave antennas; millimetre wave detectors; slot antennas; superconducting junction devices; YBCO grain boundary Josephson junctions; YBa₂Cu₃O₇; antenna impedance; coplanar waveguide-fed slot dipole antennas; coupling efficiency; finite difference time domain method; high-T_c Josephson junction detectors; high-temperature superconductors; millimeter-wave sensitivity; Coplanar waveguides; Detectors; Dipole antennas; Grain boundaries; Impedance; Josephson junctions; Millimeter wave technology; Slot antennas; Waveguide junctions; Yttrium barium copper oxide; Finite difference time domain methods; Josephson junctions; high-temperature superconductors; millimeter wave antennas; millimeter wave detectors;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2005.849915

Filename

1439696