The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 08, 1998
Filed:
Sep. 11, 1996
Kazuhiko Honjo, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A high-temperature superconductor (HTS) thin film device such as a patch antenna or a microstrip line is produced by using a substrate of a low-permittivity material such as polytetrafluoroethylene in which fine particles of glass fiber are dispersed. Initially a HTS film is deposited on a conventional MgO or SrTiO.sub.3 substrate by sputtering or laser ablation. The low-permittivity substrate is bonded to the HTS film on the oxide substrate with an adhesive, and then the oxide substrate is removed by grinding or abrasion. After that the HTS film on the low-permittivity substrate is patterned. Since the low-permittivity substrate is small in the degree of wavelength shortening, current density in the HTS film reduces and therefore power loss of the device decreases.