Tunable microwave impedance matching to a high impedance source using a Josephson metamaterial

Abstract : We report the efficient coupling of a 50 Ω microwave circuit to a high impedance conductor. We use an impedance transformer consisting of a λ/4 co-planar resonator whose inner conductor contains an array of superconducting quantum interference devices (SQUIDs), providing the resonator with a large and tunable lineic inductance L ∼ 80µ 0 , resulting in a large characteristic impedance Z C ∼ 1 kΩ. The impedance matching efficiency is characterized by measuring the shot noise power emitted by a dc biased high resistance tunnel junction connected to the resonator. We demonstrate matching to impedances in the 15 to 35 kΩ range with bandwidths above 100 MHz around a resonant frequency tunable in the 4 to 6 GHz range.
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Carles Altimiras, Olivier Parlavecchio, Philippe Joyez, Denis Vion, Patrice Roche, et al.. Tunable microwave impedance matching to a high impedance source using a Josephson metamaterial. Applied Physics Letters, American Institute of Physics, 2013, 103, pp.212601. ⟨10.1063/1.4832074⟩. ⟨cea-01479016⟩

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