Laminate with an electrically conductive layer formed as an antenna structure

Abstract

A laminate is formed from a carrier layer and an electrically conductive layer. In one section, the conductive layer is formed into an antenna structure. The antenna structure can be produced in a joint operation with the electrically conductive layer. The antenna structure is connected to a microchip, so that data can be written in or read out without contact in a wireless transponder system.

We claim:  
     
         1 . A packaging material, comprising: 
 a laminate formed with at least one carrier layer and a conductive layer on said carrier layer;    an antenna structure forming a constituent part of said conductive layer; and    a microchip conductively connected to said antenna structure, for enabling contact-free data interchange between said microchip and a transmitting and receiving station via said antenna structure.    
     
     
         2 . The packaging material according to  claim 1 , which comprises a covering layer applied to said electrically conductive layer.  
     
     
         3 . The packaging material according to  claim 2 , wherein said covering layer is formed of a water-repellent material.  
     
     
         4 . The packaging material according to  claim 1 , wherein said laminate further comprises, at least in some sections thereof, a layer of oxygen-impermeable material.  
     
     
         5 . The packaging material according to  claim 1 , wherein said electrically conductive layer contains at least one metal.  
     
     
         6 . The packaging material according to  claim 5 , wherein said metal is aluminum.  
     
     
         7 . The packaging material according to  claim 1 , wherein said electrically conductive layer contains at least one conductive organic compound.  
     
     
         8 . The packaging material according to  claim 1 , wherein said carrier layer is formed of paper material.  
     
     
         9 . The packaging material according to  claim 1 , wherein said carrier layer is formed of a polymer.  
     
     
         10 . The packaging material according to  claim 1 , wherein said laminate is formed into a package enclosing a hollow space for receiving therein at least one foodstuff item.  
     
     
         11 . The packaging material according to  claim 1 , which comprises an information carrier conductively connected to said antenna structure.  
     
     
         12 . The packaging material according to  claim 11 , wherein said information carrier is a microchip capable of data storage.  
     
     
         13 . The packaging material according to  claim 1 , which comprises an electronic capacitor conductively connected to said antenna structure.  
     
     
         14 . The packaging material according to  claim 1 , wherein said antenna structure is formed with a plurality of turns.