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A distributed active patch antenna model of a Josephson oscillator
Stockholm University, Faculty of Science, Department of Physics.ORCID iD: 0000-0002-3131-8658
Number of Authors: 12023 (English)In: Beilstein Journal of Nanotechnology, ISSN 2190-4286, Vol. 14, p. 151-164Article in journal (Refereed) Published
Abstract [en]

Optimization of Josephson oscillators requires a quantitative understanding of their microwave properties. A Josephson junction has a geometry similar to a microstrip patch antenna. However, it is biased by a dc current distributed over the whole area of the junction. The oscillating electric field is generated internally via the ac-Josephson effect. In this work, I present a distributed, active patch antenna model of a Josephson oscillator. It takes into account the internal Josephson electrodynamics and allows for the determination of the effective input resistance, which couples the Josephson current to cavity modes in the transmission line formed by the junction. The model provides full characterization of Josephson oscillators and explains the origin of the low radiative power efficiency. Finally, I discuss the design of an optimized Josephson patch oscillator capable of reaching high efficiency and radiation power for emission into free space.

Place, publisher, year, edition, pages
2023. Vol. 14, p. 151-164
Keywords [en]
antenna theory, cavity modes, Josephson effect, terahertz radiation
National Category
Nano Technology Materials Engineering Condensed Matter Physics
Identifiers
URN: urn:nbn:se:su:diva-215287DOI: 10.3762/bjnano.14.16ISI: 000925846200001PubMedID: 36761677Scopus ID: 2-s2.0-85172242198OAI: oai:DiVA.org:su-215287DiVA, id: diva2:1745411
Available from: 2023-03-23 Created: 2023-03-23 Last updated: 2023-10-06Bibliographically approved

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Krasnov, Vladimir M.

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