Abstract
A new element for integrated mm-wave receivers — a superconducting attenuator for high frequency signals has been proposed, designed and successfully tested. The principle of operation is based on the change in the microwave impedance of a superconductor-insulator-superconductor (SIS) Josephson tunnel junction when biased at different points in the dc IV-characteristic ( IV-C). Both numerical calculations and 70 GHz experiments have demonstrated low insertion loss in the “open” state and a wide dynamic range of more than 15 dB.
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