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Application of a DC SQUID array amplifier to an electrically small active antenna

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13 Author(s)
J. Luine ; TRW Space & Electron. Group, Redondo Beach, CA, USA ; L. Abelson ; D. Brundrett ; J. Burch
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We have built and operated a wide band electrically small active antenna consisting of a YBa/sub 2/Cu/sub 3/O/sub 7/ half-loop over ground plane antenna, an LTS (niobium) 200 element DC SQUID array amplifier, and low-noise cryogenic GaAs buffer amplifier. These components were integrated with a liquid He flow cryostat into a portable stand-alone package. Measurements of active antenna response from 50 to 500 MHz were made using a transverse electromagnetic cell to illuminate the half-loop antenna. At frequencies below the observed antenna resonance (250 MHz) the active antenna response is flat thereby exhibiting wide band gain.

Published in:

IEEE Transactions on Applied Superconductivity  (Volume:9 ,  Issue: 2 )