Abstract
Abstract We have developed a novel coplanar resonator serving as a tank circuit for rf washer supercenductry quantum interference device (SQUID)s. Two coplanar lines surround flux concentrator washers. The SQUID, 2.5 or 3.5 mm in diameter, is coupled to the concentrator in the flip-chip configuration. In these layouts, the adjustable resonant frequency is up to the GHz-range. With SQUID loops of 10×500 μm2 (SQUID inductance Ls=260 pH), we measured at 77 K white flux noise levels Sφ1/2 of 8.5 μφ0/√Hz. This corresponded to an energy resolution ϵ of 850 h and a field resolution of about 16 fT/√Hz for a concentrator diameter of 13.4 mm.
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