LC structure useful in radio frequency security systems

US5291180A · kind A · utility

Inventor

• Max Reeb · Uhingen, DE

Key dates

• Filing date: May 7, 1992
• Grant date: Mar 1, 1994
• Expiry date: May 7, 2012

Classification

• Technology area (CPC H): Electricity
• CPC primary: H05K1/165
• WIPO field: Control
• WIPO sector: Instruments

Abstract

The proposed LC structure is comprised of a flexible insulative layer folded back on itself about a predetermined foldline, said insulative layer having on one surface an electrically conductive layer configured to form first and second alike planar multi-turn spirals which, in a like folded superposition, counter turn against each other (if viewed from the same side) alinged face-to-face, and turn by turn, spaced by said folded flexible insulative layer. At least first and second substantially two-dimensionally shaped conductive layer portions connect to said first and second multi-turn spirals on opposite sides of said foldline, thereby juxtaposing each other and having sandwiched therebetween at least said dielectric layer, and leaving between each other an elongated region in which said conductive layer is predominantly absent, for thus opposing any tendency of said layers to fold along any line other than said predetermined foldline.