Zobrazeno 1 - 10
of 49
pro vyhledávání: '"C.D. Langham"'
Publikováno v:
IEEE Transactions on Appiled Superconductivity. 7:3504-3507
High Q dielectric loaded superconducting resonators have many potential microwave applications. A key issue for many of these is the stability with which the resonant frequencies of such resonators may be realised, for use as frequency references etc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::323527d3c7b0ee013344e7391fc5c779
https://doi.org/10.1109/77.622149
https://doi.org/10.1109/77.622149
Publikováno v:
IEEE Transactions on Instrumentation and Measurement. 46:122-125
High-quality, high-temperature superconducting (HTS) thin-films exhibit very low losses at microwave frequencies and, as a result, allow very high Q resonators to be produced. The size of such resonators may be significantly reduced by loading with l
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6877b3abad46791998ca0bc375d6d696
https://doi.org/10.1109/19.571789
https://doi.org/10.1109/19.571789
Publikováno v:
Cryogenics. 37:681-684
This analysis provides the possibility of developing microwave phase shifters based on the dielectric substrate nonlinearity, with the conducting surfaces made of a superconductor. The displacement vector, the dipole moment, polarization, polarizabil
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c5574b996b8f96270cd0bbfde9c1d4e1
https://doi.org/10.1016/s0011-2275(97)00042-8
https://doi.org/10.1016/s0011-2275(97)00042-8
Autor:
H. A. Klein, Helen S. Margolis, C.D. Langham, B. R. Walton, Patrick E. G. Baird, J.L. Flowers
Publikováno v:
CPEM Digest (Conference on Precision Electromagnetic Measurements).
The 2S 1/2-8D 5/2 transition in atomic hydrogen has been observed as part of the preparation for a Rydberg constant determination at the National Physical Laboratory, UK. We describe this observation and the ongoing improvements to the experimental a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c9956023605f83d5bda56b9554ab6e1e
http://ora.ox.ac.uk/objects/uuid:1413d378-d14e-44fe-9254-7f5afac868ab
http://ora.ox.ac.uk/objects/uuid:1413d378-d14e-44fe-9254-7f5afac868ab
Publikováno v:
Superconductor Science and Technology. 3:151-154
A coaxial microwave cavity has been constructed using a YBa2Cu3O7 sintered rod, 0.75 mm in diameter, as the centre conductor. The surface resistance as a function of temperature has been measured between 4.2 and 300 K. At 77 K the material exhibits l
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0249b7a5305536103372657822e4dfdd
https://doi.org/10.1088/0953-2048/3/3/010
https://doi.org/10.1088/0953-2048/3/3/010
Autor:
J.C. Gallop, C.D. Langham
Publikováno v:
Proceedings of 20th Biennial Conference on Precision Electromagnetic Measurements.
Sapphire dielectric resonators (SDR) at cryogenic temperatures have been used to produce oscillators of exceptional short- and medium-term stability. We discuss the demonstrated performance achieved at the National Physical Laboratory (NPL) as well a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3d6cb1bee428b434f5814f3ed23108ec
https://doi.org/10.1109/cpem.1996.546764
https://doi.org/10.1109/cpem.1996.546764
Publikováno v:
1998 Conference on Precision Electromagnetic Measurements Digest (Cat. No.98CH36254).
We show some preliminary observations of "whispering gallery" modes in a sapphire rod 100 mm long and 20 mm in diameter. Traditionally dielectric ring resonators or short squat resonators (D/L/spl ges/1) have been used for the observation of such mod
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0fca837baf95f88714d3facf9eb68da0
https://doi.org/10.1109/cpem.1998.700038
https://doi.org/10.1109/cpem.1998.700038
Autor:
C.D. Langham, J.C. Gallop
Publikováno v:
IEEE Transactions on Instrumentation and Measurement. 42:96-98
The development of a new design of cryogenic sapphire dielectric resonator is reported. The temperature dependence of the resonant frequency and width is discussed. Preliminary results of a prototype oscillator referenced to this resonator are given.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::10a993900eec64dd7620b4b8185528df
https://doi.org/10.1109/19.278529
https://doi.org/10.1109/19.278529
Publikováno v:
27th European Microwave Conference, 1997.
This study provides the possibility of developing tunable microwave components based on the dielectric substrate nonlinearity, with the conducting surfaces made of a superconductor. It is shown that with a ferroelectric film thickness of 140 nm, phas
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::11a1f9756c5d2489a2fe2b35cefc58e0
https://doi.org/10.1109/euma.1997.337853
https://doi.org/10.1109/euma.1997.337853
Publikováno v:
IEE Colloquium on Superconducting Microwave Circuits.
There exists considerable experience worldwide in research and development of high Q dielectric resonators based on sapphire and conventional superconductors at liquid helium temperatures. Stable microwave loop oscillators have been built, based on h
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a62f1e77dccd6dc8248ce05e97c3cb11
https://doi.org/10.1049/ic:19960601
https://doi.org/10.1049/ic:19960601