Time filter

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San Diego, CA, United States

Prokopenko G.V.,Hypres Inc. | Mukhanov O.A.,Hypres Inc. | Leese De Escobar A.,SPAWAR SSC | Taylor B.,SPAWAR SSC | And 6 more authors.
IEEE Transactions on Applied Superconductivity | Year: 2013

SQUID arrays are promising candidates for low-profile antennas and low-noise amplifier applications. We present the integrated circuit designs and results of dc and radio frequency measurements of wideband serial arrays based on the integration of linear bi-SQUID cells forming a superconducting quantum interference filter (bi-SQUID SQIF). Various configurations of serial array designs are described. The measured linearity, power gain, and noise temperature are analyzed and compared. The experimental results are matched to results of mathematical modeling. A serial bi-SQUID SQIF arrays are integrated into a coplanar waveguide, and symmetrically grounded to corresponding sides of the coplanar waveguide. The radio frequency output comes out from the central common line, which is also used for dc biasing, and forms a symmetrical balanced output. The signal and dc flux biasing line is designed as coplanar lines passed in parallel over each bi-SQUID cell in a bidirectional fashion concentrating magnetic flux inside of each cell. Serial bi-SQUID SQIF arrays are fabricated on 5 mm \times 5 mm chips using a standard HYPRES niobium 4.5 kA/cm2 fabrication process. © 2002-2011 IEEE.

Longhini P.,SPAWAR SSC | Berggren S.,San Diego State University | Palacios A.,San Diego State University | In V.,SPAWAR SSC | De Escobar A.L.,SPAWAR SSC
IEEE Transactions on Applied Superconductivity | Year: 2011

In this paper we provide numerical simulations for modeling an array of non-locally coupled DC SQUIDs that are coupled through the magnetic field created by the circulating current. The motivation is based on work using an array of non-identical SQUID loops or SQIFs to produce a non-periodic voltage response with a unique anti-peak centered at the zero applied flux. Our approach differs by using an array of identical SQUID loops and varying the spacing between each of these loops. Certain distributions of spacing between SQUIDs demonstrate the anti-peak response as seen in the SQIF. © 2011 IEEE.

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