Structure with switchable magnetic properties

专利名称：Structure with switchable magnetic

properties

发明人：MICHAEL CHARLES KEOGH WILTSHIRE申请号：AU3586701申请日：20010306公开号：AU3586701A公开日：20010917

摘要：A structure (40) with switchable magnetic properties comprises: an array ofcapacitive elements (44) in which each capacitive element (44) includes a low resistanceconducting path and is such that a magnetic component (H) of electromagnetic radiation(12) lying within a predetermined frequency band induces an electrical current (j) to flowaround said path and through said associated element (44). The size of the elements (44)and their spacing (alpha) apart are selected such as to provide a predeterminedpermeability (mu) in response to said received electromagnetic radiation (12). Eachcapacitive element (44) comprises a plurality of stacked planar sections (42) each orwhich comprises at least two concentric spiral conducting members or tracks (46, 48)which are electrically insulated from each other. A switchable permittivity material, suchas Barium Strontium Titanate (BST) is provided between the tracks. The magneticproperties of the structure are switched by applying a dc electrical potential betweenthe conducting tracks.

申请人：MARCONI CASWELL LIMITED

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