Composite magnetic antenna and rf tag, and metal part and metal tool on which the composite magnetic antenna or rf tag is installed

Abstract

The present invention relates to a composite magnetic antenna for information communication utilizing a magnetic field component as well as a composite RF tag using the composite magnetic antenna, which can be embedded in metals while maintaining a sufficient communication sensitivity unlike conventional RF tags which were unusable in the metal embedding applications. The composite RF tag for transmitting and receiving information using an electromagnetic induction method according to the present invention, comprises a magnetic antenna on which an IC is mounted, and an insulating material and a metal material or a conductive material which are formed around the magnetic antenna, wherein the magnetic antenna comprises a central core formed of a magnetic material, and an electrode material formed into a coil around the central core; the insulating material is formed around the magnetic antenna except for one longitudinal end of the coil of the magnetic antenna; and the metal material or the conductive material is formed on an outside of the insulating material.

1 . A composite RF tag for transmitting and receiving information using an electromagnetic induction method, comprising a magnetic antenna on which an IC is mounted, and an insulating material and a metal material or a conductive material which are formed around the magnetic antenna,
 the magnetic antenna comprising a central core formed of a magnetic material, and an electrode material formed into a coil around the central core;   the insulating material being formed around the magnetic antenna except for one longitudinal end of the coil of the magnetic antenna; and   the metal material or the conductive material being formed on an outside of the insulating material,   wherein the RF tag is configured for transmitting and receiving the information at 13.56 MHz.   
     
     
         2 . A composite RF tag according to  claim 1 , wherein a length of the metal material or the conductive material in a depth direction thereof is not less than 1.0 time a longitudinal length of the magnetic antenna. 
     
     
         3 . A composite RF tag according to  claim 1 , wherein the central core has a magnetic permeability of 70 to 120. 
     
     
         4 . A composite RF tag for transmitting and receiving information using an electromagnetic induction method, comprising a magnetic antenna on which an IC is mounted, and an insulating material and a metal material or a conductive material which are formed around the magnetic antenna,
 the magnetic antenna comprising a central core formed of a magnetic material and a non-magnetic material, and an electrode material formed into a coil around the central core;   the insulating material being formed around the magnetic antenna except for one longitudinal end of the coil of the magnetic antenna; and   the metal material or the conductive material being formed on an outside of the insulating material,   wherein the RF tag is configured for transmitting and receiving the information at 13.56 MHz.   
     
     
         5 . A composite magnetic antenna for transmitting and receiving information using an electromagnetic induction method, comprising a magnetic antenna, and an insulating material and a metal material or a conductive material which are formed around the magnetic antenna,
 the magnetic antenna comprising a central core formed of a magnetic material or formed of the magnetic material and a non-magnetic material, and an electrode material formed into a coil around the central core;   the insulating material being formed around the magnetic antenna except for one longitudinal end of the coil of the magnetic antenna; and   the metal material or the conductive material being formed on an outside of the insulating material,   wherein the magnetic antenna is configured for transmitting and receiving the information at 13.56 MHz.   
     
     
         6 . A composite magnetic antenna according to  claim 5 , wherein an area ratio of all portions of the magnetic material to all portions of the non-magnetic material is not more than 1.0. 
     
     
         7 . A system for transmitting and receiving information using an electromagnetic induction method, the system comprising:
 a metal tool or metal part including a small-space hole; and   a composite RF tag embedded in the small-space hole, the composite RF tag including a magnetic antenna on which an IC is mounted, and an insulating material and a metal material or a conductive material which are formed around the magnetic antenna,   the magnetic antenna comprising a central core formed of a magnetic material, and an electrode material formed into a coil around the central core;   the insulating material being formed around the magnetic antenna except for one longitudinal end of the coil of the magnetic antenna; and   the metal material or the conductive material being formed on an outside of the insulating material,   wherein the RF tag is configured for transmitting and receiving the information at 13.56 MHz.