New microwave circuits for programmable voltage standards using high-temperature Josephson junction arrays

Research was conducted to examine new microwave circuits for voltage standard application containing 256 bicrystal junctions. Results illustrate successful series dc and parallel ac biasing in such a meandered array. On each of the 8 subarrays, the first current step was achieved at liquid nitrogen temperature at a frequency f = 27332 MHz and for a constant microwave power. Possible ways to increase uniformity of the relative ac current and, correspondingly, the bias frequency were demonstrated.