Coplanar strips for Josephson voltage standard circuits

Schubert, M.; May, T.; Wende, G.; Fritzsch, L.; Meyer, H.‐G.

doi:10.1063/1.1394163

Cited by 21 publications

(13 citation statements)

References 8 publications

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“…1 Volt 14 bit programmable Josephson voltage circuits were designed and fabricated. SINIS JJ's with the material sequence Nb/Al/AlO Al/AlO Al/Nb were integrated in coplanar strips (CPS) used as microwave transmission lines instead of microstrip lines or coplanar waveguides [4], [5]. The CPS design doubles the scale of JJ's integration and simplifies the fabrication technology.…”

Section: Microwave Circuit Designmentioning

confidence: 99%

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Josephson voltage standard circuit operation with a pulse tube cooler

Wende¹,

Schubert²,

May³

et al. 2003

IEEE Trans. Appl. Supercond.

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For a more wide-spread use of Josephson voltage standards, cryogen-free operation, by means of an appropriate closed-cycle refrigerator, is highly desirable. In this work we present a low-noise pulse tube cooler (PTC) that is capable to cool the voltage standard circuits to temperatures below 4 K.As a low loss dielectric waveguide with a very small thermal conductivity a Teflon strip was used for the microwave transmission. The matched transition from the WR12 rectangular waveguide to the Teflon strip and vice versa was made using special exponential tapers.Programmable 1 Volt 14 bit SINIS and 10 Volt SIS arrays assembled in the PTC operated well, i.e., demonstrated a similar performance to that measured in liquid helium. The Josephson junction arrays were integrated in coplanar strips instead of the commonly used microstriplines for the microwave transmission lines. The 1 Volt SINIS array contained 8,192 Josephson junctions (JJ's). It generated an inherently stable Josephson voltage step of 1.19 V at a driving microwave frequency of 70 GHz. The step width was 150 A and the critical current of the junctions was 550 A. Similar results were obtained under liquid helium cooling conditions. In another experiment a 10 Volt voltage standard chip with 19,700 SIS JJ's was installed. It was possible to generate stable Shapiro steps at the 10 V level. Index Terms-Cryocooler, Josephson junctions, microwave dielectric waveguide, voltage standard.

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Section: Microwave Circuit Designmentioning

confidence: 99%

“…Coplanar strips (CPS) were used instead of microstriplines as microwave transmission lines [4], [5]. The CPS design simplifies the fabrication technology and doubles the scale of JJ's integration.…”

Section: Introductionmentioning

confidence: 99%

Josephson voltage standard circuit operation with a pulse tube cooler

Wende¹,

Schubert²,

May³

et al. 2003

IEEE Trans. Appl. Supercond.

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show abstract

“…Benz, 1995). Coplanar striplines were first used for conventional voltage standards operated at 75 GHz (Schubert et al, 2001b). CPW and CPS offer the advantage of a rather simple required fabrication technology compared to the microstrip line that needs an additional ground plane and a dielectric layer.…”

Section: Designs -A Brief Surveymentioning

confidence: 99%

Development of Josephson voltage standards

Kohlmann¹,

Behr²

2011

Superconductivity - Theory and Applications

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“…Over this length 200-250 bicrystal junctions can be placed along one GB. For microwave irradiation the array of HTS junctions was embedded in the coplanar transmission line [15] as it is shown in Fig. 4.…”

Section: Microwave Properties Of Lumped Arraysmentioning

confidence: 99%