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Journal of Physics Conference Series

Superconducting Quantum Arrays for Broadband RF Systems

Victor K. Kornev, Aleksei Sharafiev, Igor I. Soloviev, Nikolay V. Kolotinskiy, Oleg A. Mukhanov

Published May 12, 2014• 3 citations
Publisher

Abstract

Superconducting Quantum Arrays (SQAs), homogenous arrays of Superconducting Quantum Cells, are developed for implementation of broadband radio frequency (RF) systems capable of providing highly linear magnetic signal to voltage transfer with high dynamic range, including active electrically small antennas (ESAs). Among the proposed quantum cells which are bi-SQUID and Differential Quantum Cell (DQC), the latter delivered better performance for SQAs. A prototype of the transformer-less active ESA based on a 2D SQA with nonsuperconducting electric connection of the DQCs was fabricated using HYPRES niobium process with critical current density 4.5 kA/cm 2 . The measured voltage response is characterized by a peak-to-peak swing of ~100 mV and steepness of ~6500 μV/μT.

DOI
10.1088/1742-6596/507/4/042019

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Superconducting Quantum Arrays (SQAs), homogenous arrays of Superconducting Quantum Cells, are developed for implementation of broadband radio frequency (RF) systems capable of providing highly linear magnetic signal to voltage transfer with high dynamic range, including active electrically small antennas (ESAs). Among the proposed quantum cells which are bi-SQUID and Differential Quantum Cell (DQC), the latter delivered better performance for SQAs. A prototype of the transformer-less active ESA based on a 2D SQA with nonsuperconducting electric connection of the DQCs was fabricated using HYPRES niobium process with critical current density 4.5 kA/cm 2 . The measured voltage response is characterized by a peak-to-peak swing of ~100 mV and steepness of ~6500 μV/μT.
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We discuss design issues and present Nb-based layout designs of two basic cells for broadband active electrically small antennas based on superconducting quantum arrays. The cells are the differential array circuit and bi-SQUID. The cell layouts realize parameter values answering results of the in-depth theoretical analysis performed earlier for attaining the high-linearity voltage response to magnetic signal. The layouts are to give reference approaches to the antenna circuit designs to be fabricated using niobium process.