A new 10-V array of Josephson junctions based on low-frequency designs scaled up to 94 GHz

Author

Yoshida, Haruo ; Murayama, Yasushi ; Endo, Tadashi

Author_Institution

Advantest Labs., Miyagi, Japan

Volume

46

Issue

1

fYear

1997

fDate

2/1/1997 12:00:00 AM

Firstpage

72

Lastpage

78

Abstract

A novel approach is described for the design of improved coupling of millimeter-waves in a 10-V array of Josephson junctions. In this approach, microwave structures were fabricated and tested in the range 2.8 GHz to 3.6 GHz, and a scaling calculation was then used to transform them to 94 GHz. By optimizing the trade-off between antenna size and efficiency, it was possible to make more space available on the device chip to increase the number of Josephson junctions. Simulation results showed that the optimal antenna is a short double-fin-line type. This antenna type allowed us to fabricate a Josephson junction array that had 25944 Nb/Al-AlO_x/Nb junctions. For this new array, zero-crossing steps were observed up to 18.5 V. The new array was then successfully used to calibrate a Zener voltage standard that had a 10-V output

Keywords

Josephson effect; aluminium; aluminium compounds; fin line components; measurement standards; millimetre wave measurement; niobium; voltage measurement; 10 V; 94 GHz; Josephson junctions; Nb-Al-AlO-Nb; Zener voltage standard; antenna efficiency; antenna size; low-frequency designs; millimeter-wave coupling; scaling calculation; short double-fin-line type; zero-crossing steps; Antenna arrays; Antennas and propagation; Circuit simulation; Josephson junctions; Laboratories; Microwave frequencies; Millimeter wave propagation; Millimeter wave technology; Niobium; Voltage;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.552160

Filename

552160