Imperial College London
Portrait Picture

ProfessorNorbertKlein

Faculty of Engineering, Department of Materials

Chair in Electromagnetic Nanomaterials
 
 
 
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Contact

 

+44 (0)20 7594 6783n.klein Website

 
 
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Location

 

RSM 201CRoyal School of MinesSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

214 results found

Yi HR, Zhang Y, Schubert J, Zander W, Zeng XH, Klein Net al., 2000, Superconducting multiturn flux transformers for radio frequency superconducting quantum interference devices, JOURNAL OF APPLIED PHYSICS, Vol: 88, Pages: 5966-5974, ISSN: 0021-8979

Journal article

, 2000, Superconductors and cryogenics for future communication systems, IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, Vol: 48, Pages: 1227-1239, ISSN: 0018-9480

Journal article

Yi HR, Zhang Y, Klein N, 2000, Simulation of the superconducting multiturn flux transformer integrated with a coplanar resonator, APPLIED PHYSICS LETTERS, Vol: 76, Pages: 3606-3608, ISSN: 0003-6951

Journal article

Klein N, Winter M, Yi HR, 2000, Cryogenic dielectric resonators for future microwave communication systems, 4th European Conference on Applied Superconductivity, Publisher: IOP PUBLISHING LTD, Pages: 527-531, ISSN: 0953-2048

Conference paper

Winter M, Klein N, Hao L, Gallop JCet al., 2000, Cryogenic composite whispering-gallery mode resonators for low-phase noise frequency standards, IEEE/EIA International Frequency Control Symposium and Exhibition, Publisher: IEEE, Pages: 500-505, ISSN: 1075-6787

Conference paper

Klein N, Vitusevych S, Winter M, Yi HRet al., 2000, Novel cryogenic dielectric resonator devices for satellite communication, 12th International Symposium on Superconductivity (ISS 99), Publisher: SPRINGER-VERLAG TOKYO, Pages: 1042-1047

Conference paper

Klein N, Schornstein S, Ghosh IS, Schemion D, Winter M, Zuccaro Cet al., 1999, High-<i>Q</i> dielectric resonator devices at cryogenic temperatures, 1998 Applied Superconductivity Conference, Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, Pages: 3573-3576, ISSN: 1051-8223

Conference paper

Hao L, Klein N, Gallop JC, Radcliffe WJ, Ghosh ISet al., 1999, Temperature compensated cryogenic whispering gallery mode resonator for microwave frequency standard applications, 1998 Conference on Precision Electromagnetic Measurements (CPEM 98), Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, Pages: 524-527, ISSN: 0018-9456

Conference paper

Alford NMN, Penn SJ, Templeton A, Wang X, Filhol P, Klein N, Zuccaro C, Gallop JCet al., 1998, Very low loss ceramic dielectric resonator materials, Pages: 189-194, ISSN: 0272-9172

Certain dielectric oxide single crystals display very low loss at microwave frequencies and on cooling the loss is generally observed to drop. In this paper, the loss of polycrystalline ceramics of Al2O3, Ba(Mg1/3Ta2/3)O3 (BMT) and Zr0.875Sn0.25Ti0.875O4 (ZTS) has been studied. Alumina, Al2O3 has been studied as a model material for dielectric loss. Theory predicts that the loss in single crystal sapphire should follow a T5 dependence. However at low temperatures the loss is dominated by extrinsic losses due to crystal imperfection, residual dopant atoms, dislocations and other lattice defects and the T5 dependence does not hold. In polycrystalline alumina the intrinsic loss is immediately masked by these extrinsic losses, even at room temperature, and a simple T dependence is observed. Results on polycrystalline alumina show that a Q of > 5×104 at 10 GHz and at room temperature are possible and Q's well in excess of 105 at 10 GHz and 77 K can be achieved.

Conference paper

Alford NMN, Penn SJ, Templeton A, Wang X, Gallop JC, Klein N, Zuccaro C, Filhol Pet al., 1997, Microwave dielectrics, IEE Colloquium (Digest), ISSN: 0963-3308

In the last 20 years the field of microwave communications has seen exceptional growth. It has been estimated that there are over 55,000 new users of cellular communications every day1. This is largely due to the wish of most people for mobility as a key feature of communications. This growth places an enormous burden on the filters to the extent that filters using current technology simply cannot cope with the increased traffic demand. There is a requirement for systems with lower insertion loss, steeper filter skirts, better selectivity and ideally all of these with miniaturisation. In this paper, dielectric resonators are discussed. The interest in dielectric resonators is a direct consequence of the hurdles facing current technology. Dielectric resonators are now being developed with extremely attractive properties as well as the inherent potential for miniaturisation. The key properties are seen to be the dielectric loss (tan δ) the dielectric constant (ε') and the temperature coefficient of the resonant frequency (TCf).

Journal article

Penn SJ, Alford NMN, Templeton A, Klein N, Gallop JC, Filhol P, Wang Xet al., 1997, Low loss ceramic dielectrics for microwave filters, IEE Colloquium (Digest), ISSN: 0963-3308

Certain dielectric oxide single crystals display very low loss at microwave frequencies. On cooling the loss is generally observed to drop. The Q of sapphire at 10 GHz exceeds 106 at low temperatures of around 10K. However, single crystals are expensive and the purpose of this research is to explore inexpensive, sintered polycrystalline alternatives. By very careful attention to purity, processing and microstructure Q values approaching those of single crystals have been achieved. The loss of polycrystalline ceramics of Al2O3, Ba(Mg1/3Ta2/3)O3 (BMT) and Zr0.875Sn0.25Ti0.875O4 (ZTS) has been studied Alumina, Al2O3 has been studied as a model material for dielectric loss. Theory predicts that the loss in single crystal sapphire should follow a T5 dependence. However at low temperatures the loss is dominated by extrinsic losses due to crystal imperfection, residual dopant atoms, dislocations and other lattice defects and the T5 dependence does not hold. In polycrystalline alumina the intrinsic loss is immediately masked by these extrinsic losses, even at room temperature, and a simple T dependence is observed. Results on polycrystalline alumina show that a Q of > 5×104 at 10 GHz and at room temperature are possible and Q's well in excess of 105 at 10 GHz and 77 K can be achieved in a design made compact by the use of a HTS thick film shield.

Journal article

Zuccaro C, Winter M, Klein N, Urban Ket al., 1997, Microwave absorption in single crystals of lanthanum aluminate, JOURNAL OF APPLIED PHYSICS, Vol: 82, Pages: 5695-5704, ISSN: 0021-8979

Journal article

Zuccaro C, Ghosh I, Urban K, Klein N, Penn S, Alford NMet al., 1997, Materials for HTS-shielded dielectric resonators, 1996 Applied Superconductivity Conference, Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, Pages: 3715-3718, ISSN: 1051-8223

Conference paper

Divin YY, Pavlovskii VV, Volkov OY, Schulz H, Poppe U, Klein N, Urban Ket al., 1997, Hilbert-transform spectral analysis of millimeter- and submillimeter-wave radiation with high T-c Josephson junctions, 1996 Applied Superconductivity Conference, Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, Pages: 3426-3429, ISSN: 1051-8223

Conference paper

Ghosh IS, Tellmann N, Schemion D, Scholen A, Klein Net al., 1997, Low phase noise microwave oscillators based on HTS shielded dielectric resonators, 1996 Applied Superconductivity Conference, Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, Pages: 3071-3074, ISSN: 1051-8223

Conference paper

Zaitsev AG, Wordenweber R, Ockenfuss G, Kutzner R, Konigs T, Zuccaro C, Klein Net al., 1997, Microwave losses and structural properties of large-area YBa2Cu3O7 films on r-cut sapphire buffered with (001)/(111) oriented CeO2, 1996 Applied Superconductivity Conference, Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, Pages: 1482-1485, ISSN: 1051-8223

Conference paper

Schulz H, Poppe U, Klein N, Urban K, Divin YY, Kotelyanskii IMet al., 1997, Fabrication and characterization of YBa2Cu3O7-x grain-boundary Josephson junctions on (110) NdGaO3 bicrystal and single-twin substrates, 1996 Applied Superconductivity Conference, Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, Pages: 3009-3012, ISSN: 1051-8223

Conference paper

Zuccaro C, Klein N, Zaitsev AG, Wordenweber R, Lemaitre Y, Mage JCet al., 1997, Nonlinear microwave losses of large area YBCO thin films, 3rd European Conference on Applied Superconductivity (EUCAS 1997), Publisher: IOP PUBLISHING LTD, Pages: 295-298, ISSN: 0951-3248

Conference paper

Ghosh IS, Schemion D, Klein N, 1997, Low phase noise microwave oscillators using temperature compensated high-Q HTS shielded dielectric resonators, 3rd European Conference on Applied Superconductivity (EUCAS 1997), Publisher: IOP PUBLISHING LTD, Pages: 611-614, ISSN: 0951-3248

Conference paper

Schornstein S, Ghosh IS, Klein N, 1997, Dielectric dual-mode filter using a high temperature superconducting image plane, 3rd European Conference on Applied Superconductivity (EUCAS 1997), Publisher: IOP PUBLISHING LTD, Pages: 267-270, ISSN: 0951-3248

Conference paper

Zuccaro C, Winter M, Penn S, Alford NM, Filhol P, Forterre G, Klein Net al., 1997, Microwave properties of dielectrics for HTS devices, 3rd European Conference on Applied Superconductivity (EUCAS 1997), Publisher: IOP PUBLISHING LTD, Pages: 69-72, ISSN: 0951-3248

Conference paper

Ghosh IS, Schemion D, Klein N, 1997, Temperature compensated high-Q dielectric resonators for long term stable low phase noise oscillators, 1997 IEEE International Frequency Control Symposium, Publisher: IEEE, Pages: 1024-1029

Conference paper

Klein N, Scholen A, Tellmann N, Zuccaro C, Urban KWet al., 1996, Properties and applications of HTS-shielded dielectric resonators: A state-of-the-art report, IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, Vol: 44, Pages: 1369-1373, ISSN: 0018-9480

Journal article

Divin YY, Schulz H, Poppe U, Klein N, Urban K, Pavlovskii VVet al., 1996, Millimeter-wave Hilbert-transform spectroscopy with high-T-c Josephson junctions, APPLIED PHYSICS LETTERS, Vol: 68, Pages: 1561-1563, ISSN: 0003-6951

Journal article

Divin YY, Schulz H, Poppe U, Klein N, Urban K, Shadrin PM, Kotelyanskii IM, Stepantsov EAet al., 1996, YBa2Cu3O7-x thin-film Josephson junctions on 2x12 degrees bicrystal(110) NdGaO3 substrates, PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, Vol: 256, Pages: 149-155, ISSN: 0921-4534

Journal article

KLEIN N, ZUCCARO C, DAHNE U, SCHULZ H, TELLMANN N, KUTZNER R, ZAITSEV AG, WORDENWEBER Ret al., 1995, DIELECTRIC-PROPERTIES OF RUTILE AND ITS USE IN HIGH-TEMPERATURE SUPERCONDUCTING RESONATORS, JOURNAL OF APPLIED PHYSICS, Vol: 78, Pages: 6683-6686, ISSN: 0021-8979

Journal article

FALEY MI, POPPE U, JIA CL, DAHNE U, GONCHAROV Y, KLEIN N, URBAN K, GLYANTSEV VN, KUNKEL G, SIEGEL Met al., 1995, APPLICATION OF JOSEPHSON EDGE TYPE JUNCTIONS WITH A PRBA2CU3O7 BARRIER PREPARED WITH BR-ETHANOL ETCHING OR CLEANING, 1994 Applied Superconductivity Conference, Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, Pages: 2608-2611, ISSN: 1051-8223

Conference paper

KLEIN N, TELLMANN N, DAHNE U, SCHOLEN A, SCHULZ H, HOFER G, KRATZ Het al., 1995, YBCO SHIELDED LAALO3 DIELECTRIC RESONATORS FOR STABLE OSCILLATORS, 1994 Applied Superconductivity Conference, Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, Pages: 2663-2666, ISSN: 1051-8223

Conference paper

AVENHAUS B, PORCH A, LANCASTER MJ, HENSEN S, LENKENS M, ORBACHWERBIG S, MULLER G, DAHNE U, TELLMANN N, KLEIN N, DUBOURDIEU C, SENATEUR JP, THOMAS O, KARL H, STRITZKER B, EDWARDS JA, HUMPHREYS Ret al., 1995, MICROWAVE PROPERTIES OF YBCO THIN-FILMS, 1994 Applied Superconductivity Conference, Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, Pages: 1737-1740, ISSN: 1051-8223

Conference paper

DAHNE U, GONCHAROV Y, KLEIN N, TELLMANN N, KOZLOV G, URBAN Ket al., 1995, FREQUENCY AND TEMPERATURE-DEPENDENCE OF THE MILLIMETER-WAVE CONDUCTIVITY OF EPITAXIAL YBA2CU3O7 FILMS, JOURNAL OF SUPERCONDUCTIVITY, Vol: 8, Pages: 129-134, ISSN: 0896-1107

Journal article

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