RF properties of high-T/sub c/ superconductors

Bohn, C. L.; Delayen, J. R.; Santos, Dayse Iara dos; Lanagan, Michael T.; Shepard, K.W.

doi:10.1109/20.92791

Cited by 20 publications

(6 citation statements)

References 4 publications

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“…We selected a frequency of 100 MHz to generate this plot, since potential transmitter applications on mobile platforms exist for very short antennas in this frequency band. The results in [9] show that increases in the value of R , begin to occur when the value of H,, approaches the range of a few hundred oersteds. Fig.…”

Section: Application To Transmitting Antennasmentioning

confidence: 94%

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A survey of possible passive antenna applications of high-temperature superconductors

Dinger

Bowling

Martin

1991

IEEE Trans. Microwave Theory Techn.

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A survey of possible applications of high-temperature superconductors (HTS's) to antennas and antenna feed networks is present?. The frequency range of consideration is 1 MHz to 100 GHZ: Three antenna application areas seem appropriate for HTS material: electrically small antennas and their matching networks; feed and matching networks for compact arrays with enhanced directive gain (superdirective arrays); and feed networks for millimeter-wave arrays. Preliminary experimental results are presented on YBaCuO and TIBaCaCuO 500 MHz half-loop antennas that show an increase in radiation efficiency (compared with a copper antenna at the same temperature) by a factor of 5 for the HTS antennas.

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Section: Application To Transmitting Antennasmentioning

confidence: 94%

“…Experimental investigations of the power limitations of HTS material use the value of the R F magnetic field, Hrf, in the transmission line as the power variable, rather than current density [9]. Fig.…”

Section: Application To Transmitting Antennasmentioning

confidence: 99%

A survey of possible passive antenna applications of high-temperature superconductors

Dinger

Bowling

Martin

1991

IEEE Trans. Microwave Theory Techn.

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“…We measured the resonance frequency and the Q factor of the HTS coil at static magnetic field strengths of from the earth field amplitude to 1.5 T. The applied magnetic field increases the losses within the HTS material (20) and shifts down the resonance frequency of the resonator, since the London penetration depth is increased (21). Measurements were made using the fringing field along the longitudinal axis of the MRI magnet.…”

Section: Methodsmentioning

confidence: 99%

High-temperature superconducting surface coil for in vivo microimaging of the human skin

2001

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A small, high‐temperature superconducting (HTS) surface coil was used to improve the signal‐to‐noise ratio (SNR) for in vivo human skin microscopy at 1.5 T. The internal noise of the conventional copper coil limits the SNR for this application. Inductive measurements of the HTS coil parameters indicated that at 77 K its internal noise contributed about 4% of the total noise, and the predicted SNR gain was about 3.2‐fold over that of a room‐temperature copper coil. In vivo images of the human skin produced with the HTS coil showed highly resolved details and a 3.7‐fold improvement in SNR over that obtained with the room‐temperature copper coil. Magn Reson Med 45:376–382, 2001. © 2001 Wiley‐Liss, Inc.

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“…29 However, rJ. surface resistance increases significantly with ' frequency and alternating current magnetic field.…”

Section: Thick·film Depositionmentioning

confidence: 99%

Fabricating polycrystalline high-Tc superconductors

Lanagan

Dorris

Singh

et al. 1990

JOM

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Many applications of high-temperature superconductors require the ability to carry large currents in high magnetic fields. Electrical properties of single crystals and thin films offer hope that suitable electrical properties will be obtained in polycrystalline materials. Novel microstructures can be produced by melt-recrystallization processes that can be characterized by oriented crystallites. The large critical current densities required for many applications have been demonstrated by powder-in-tube and melt-texturing processes. There are several competing processes to form bulk polycrystalline materials. Plastic forming techniques, such as extrusion and tape casting, offer the advantage of fabricating long and continuous coils. Nearterm products that operate in low magnetic fields include current leads, shielding devices and high-quality resonant cavities.

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RF properties of high-T/sub c/ superconductors

Cited by 20 publications

References 4 publications

A survey of possible passive antenna applications of high-temperature superconductors

A survey of possible passive antenna applications of high-temperature superconductors

High-temperature superconducting surface coil for in vivo microimaging of the human skin

Fabricating polycrystalline high-Tc superconductors

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