Miniaturized cooling systems for HTS antennas

Citation
K. Ehata et al., Miniaturized cooling systems for HTS antennas, IEEE APPL S, 11(1), 2001, pp. 111-114
Citations number
6
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
ISSN journal
1051-8223 → ACNP
Volume
11
Issue
1
Year of publication
2001
Part
1
Pages
111 - 114
Database
ISI
SICI code
1051-8223(200103)11:1<111:MCSFHA>2.0.ZU;2-4
Abstract
Two types of miniaturized cooling systems for High-Temperature Superconduct ing (HTS) antennas were designed and built, In this paper, details of these systems, measured and simulated properties of patch antennas installed in these systems, and results of a seal-off trial for 1 month are reported, Bo th the systems had portable size and weight and could cool the HTS devices. When a patch antenna with resonant frequency of 4.9 GHz was installed in t he Ist cooling system, the radiation pattern of the antenna was strongly fo cused in the forward direction. This is because the vacuum chamber in which the antenna was packaged influenced the microwaves radiated from the anten na. Due to this effect, the directive gain of the antenna was enhanced by 1 1.2 dB. In the 2nd system, a seal-off-trial was carried out to investigate the airtight property that is necessary for thermal isolation. The temperat ure of the sample stage could be kept under the critical temperature of YBC O for 1 month without continuous vacuum pumping. The cooling systems develo ped in this work are expected to promote the practical use of HTS antennas.