A 24-GHz Josephson array voltage standard

Abstract

A Josephson array voltage standard that operates at 24 GHz has been designed and fabricated. Substantial advantages in cost and reliability are realized over more conventional devices that operate at 70-100 GHz. Typical step stability times of 20 min are more than adequate for calibrations at the 1-V level. Designs using both probe and finline microwave couplers were tested. The probe coupler was about 3 dB more efficient and allowed a smaller chip and a less expensive mount. >