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:
Apr. 11, 1989
Filed:
Nov. 25, 1987
Gerit Boehme, Oberaudorf, DE;
Hermann Turnwald, Obersuessbach, DE;
Siemens Aktiengesellschaft, Berlin and Munich, DE;
Abstract
A traveling wave tube has a cylindrical vacuum envelope surrounding a delay line. The vacuum envelope is tightly surrounded by a permanent magnet system of ring-shaped pole discs and of magnetic rings respectively arranged between the pole discs and oppositely polarized in alternating fashion in an axial direction. The permanent magnet system is inserted into an outer envelope in form-fit fashion. An attitude and position retention for the focusing elements which is resistant to temperature shock is provided in the traveling wave tube. For this purpose the permanent magnet system is glued at its outside generated surface and the glue is formed of a mixture of an epoxy resin having adhesive properties and of glass fibers provided therein in an undirected attitude. This traveling wave tube is useful given extreme temperature fluctuations, such as in a range from -60.degree. C. through +95.degree. C.