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:
Oct. 05, 2004
Filed:
Dec. 16, 2002
Michael Charles Keogh Wiltshire, High Wycombe, GB;
Marconi Optical Components Limited, London, GB;
Abstract
A structure ( ) with switchable magnetic properties comprises: an array of capacitive elements ( ) in which each capacitive element ( ) includes a low resistance conducting path and is such that a magnetic component (H) of electromagnetic radiation ( ) lying within a predetermined frequency band induces an electrical current (j) to flow around said path and through said associated element ( ). The size of the elements ( ) and their spacing (&agr;) apart are selected such as to provide a predetermined permeability (&mgr;) in response to said received electromagnetic radiation ( ). Each capacitive element ( ) comprises a plurality of stacked planar sections ( ) each or which comprises at least two concentric spiral conducting members or tracks ( ) which are electrically insulated from each other. A switchable permittivity material, such as Barium Strontium Titanate (BST) is provided between the tracks. The magnetic properties of the structure are switched by applying a dc electrical potential between the conducting tracks.