Thin-film HTS probe coils for magnetic-resonance imaging

Several planar coil designs, with integral resonating capacitors, are reported using large-area sputtered YBCO films. One design utilizes a distributed interdigital capacitor, while a second exploits capacitive coupling of two films on opposite sides of a dielectric. Devices of the first design made...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 1993-03, Vol.3 (1), p.2450-2453
Main Authors: Withers, R.S., Liang, G.-C., Cole, B.F., Johansson, M.
Format: Article
Language:English
Subjects:
Capacitors
Coils
Dielectric substrates
Dielectric thin films
Exact sciences and technology
High temperature superconductors
Infrared, submillimeter wave, microwave and radiowave instruments, equipment and techniques
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Magnetic films
Physics
Probes
Silver
Sputtering
Submillimeter wave, microwave and radiowave spectrometers
magnetic resonance spectrometers, auxiliary equipments and techniques
Yttrium barium copper oxide
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Summary:Several planar coil designs, with integral resonating capacitors, are reported using large-area sputtered YBCO films. One design utilizes a distributed interdigital capacitor, while a second exploits capacitive coupling of two films on opposite sides of a dielectric. Devices of the first design made on LaAlO/sub 3/ have achieved Q>10/sup 4/ at 18.5 MHz, possibly limited by the loss tangent of this substrate. Identical coils made with silver films have Q=10. With the second design, Q>10/sup 4/ was achieved at the even lower frequency of 5.7 MHz.< >
ISSN:1051-8223
1558-2515
DOI:10.1109/77.233951