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Related Experiment Video

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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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Published on: August 2, 2019

A distributed active patch antenna model of a Josephson oscillator.

Vladimir M Krasnov¹

¹Department of Physics, Stockholm University, AlbaNova University Center, SE-10691 Stockholm, Sweden.

Beilstein Journal of Nanotechnology

|February 10, 2023

Summary

This study introduces a new model for Josephson oscillators, treating them as active patch antennas. This model helps optimize their microwave properties for improved efficiency and radiation power.

Keywords:

Josephson effect antenna theory cavity modes terahertz radiation

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Area of Science:

Physics
Electrical Engineering
Quantum Electronics

Background:

Josephson oscillators are crucial for quantum electronics but their microwave properties require optimization.
Josephson junctions share similarities with microstrip patch antennas, suggesting potential for antenna modeling.

Purpose of the Study:

To present a distributed, active patch antenna model for Josephson oscillators.
To quantitatively understand and improve the microwave properties and radiative efficiency of Josephson oscillators.

Main Methods:

Developed a distributed, active patch antenna model for Josephson oscillators.
Incorporated internal Josephson electrodynamics into the model.
Determined the effective input resistance coupling Josephson current to cavity modes.

Main Results:

The model provides a full characterization of Josephson oscillators.
It explains the origin of low radiative power efficiency in current designs.
The effective input resistance was determined, linking Josephson current to cavity modes.

Conclusions:

The active patch antenna model offers a pathway to optimize Josephson oscillators.
This approach can lead to designs with high efficiency and radiation power for free-space emission.
Understanding internal electrodynamics is key to overcoming efficiency limitations.