Capacitor-shunted Josephson junction for improved coupling with microwave fields

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Abstract
We report the fabrication of a capacitor‐shunted Josephson junction and its use as a microwave device with improved coupling to microwave fields. The junction was evaporated on a thin plastic substrate which was subsequently folded like a flat‐spring clip in order to make a circular coupling loop terminated by a parallel‐plate capacitor. The capacitor short‐circuits the loop for high‐frequency currents but keeps it open for dc currents, rendering possible the application of dc bias to the junction. The folded junction was observed at X band to couple 20 dB better to rf power than the same junction extended flat.