Magnetic material antenna and antenna device

Abstract

A spiral coil conductor defining its winding central section as a conductor opening section is formed on a flexible substrate. The flexible substrate has a U shaped bend along a line passing through the conductor opening section so as to envelop a magnetic material core. The magnetic material core is arranged in a state where its end face faces the bend of the flexible substrate, and the magnetic material core includes cut shapes provided at a portion of the end face. The portion at the end face faces coil conductor sections at the bend of the flexible substrate, and the cut shapes separate the portion apart from the coil conductor sections.

What is claimed is: 
     
         1 . A magnetic material antenna comprising:
 a first coil conductor;   a second coil conductor; and   magnetic material cores,   wherein each of the first coil conductor and the second coil conductor has a spiral shape that winds around a conductor opening section of the first coil conductor or the second coil conductor and includes a bend along a line passing through the conductor opening section,   wherein each magnetic material core is arranged in a state where an end face of the magnetic material core faces the bend of the first coil conductor or the second coil conductor,   wherein the first coil conductor and the second coil conductor are formed at two separate positions and connected to each other in a direction in which currents, produced by magnetic flux that is produced by the magnetic material cores and inwardly and/or outwardly passes through the conductor opening sections of the first coil conductor and the second coil conductor, are in phase,   wherein a first end of the first coil conductor is connected to a first-coil-conductor connection portion, a second end of the first coil conductor is connected to a first end of the second coil conductor, and a second end of the second coil conductor is connected to a second-coil-conductor connection portion, and   wherein the first-coil-conductor connection portion, the first coil conductor, the second coil conductor, and the second-coil-conductor connection portion are connected so as to be substantially loop-shaped.   
     
     
         2 . A magnetic material antenna comprising a first coil conductor, a second coil conductor, and magnetic material cores,
 wherein each of the first coil conductor and the second coil conductor has a spiral shape that winds around a conductor opening section of the first coil conductor or the second coil conductor and includes a bend along a line passing through the conductor opening section,   wherein the magnetic material cores are arranged in a state where part of each magnetic material core is inserted into a hole formed in the bend of the first coil conductor or the second coil conductor,   wherein the first coil conductor and the second coil conductor are formed at two separate positions and connected to each other in a direction in which currents, produced by magnetic flux that is produced by the magnetic material cores and inwardly and/or outwardly passes through the conductor opening sections of the first coil conductor and the second coil conductors, are in phase,   wherein a first end of the first coil conductor is connected to a first-coil-conductor connection portion, a second end of the first coil conductor is connected to a first end of the second coil conductor, and a second end of the second coil conductor is connected to a second-coil-conductor connection portion, and   wherein the first-coil-conductor connection portion, the first coil conductor, the second coil conductor, and the second-coil-conductor connection portion are connected so as to be substantially loop-shaped.   
     
     
         3 . The magnetic material antenna according to  claim 1 ,
 wherein each magnetic material core includes a cutout portion at a portion facing the bend and apart from the first coil conductor or the second coil conductor and the cutout portion is formed such that the width of the magnetic material core tapers off toward the conductor opening section of the first coil conductor or the second coil conductor.   
     
     
         4 . The magnetic material antenna according to  claim 3 , wherein the cutout portion tapers off toward the conductor opening section of the first coil conductor or the second coil conductor. 
     
     
         5 . The magnetic material antenna according to  claim 3  or  4 , wherein the cutout portion is formed so as to extend along substantially the full length of a coil conductor section extending in a direction perpendicular to the bend. 
     
     
         6 . The magnetic material antenna according to  claim 3 , further comprising a low permeability member disposed in part or all of the cutout portion, the low permeability member having a permeability lower than the permeability of the magnetic material core. 
     
     
         7 . The magnetic material antenna according to  claim 6 , wherein the low permeability member is made of resin or a mixture of resin and magnetic material powder, and the low permeability member and the magnetic material core are integrally molded. 
     
     
         8 . The magnetic material antenna according to  claim 1 , further comprising a dielectric member arranged in a space defined by forming the bend of each of the first coil conductor and the second coil conductor and at a position where portions of the first coil conductor or the second coil conductor face each other. 
     
     
         9 . The magnetic material antenna according to  claim 1 , wherein the bends of the first coil conductor and the second coil conductor are Z-shaped when viewed from sides of the first coil conductor and the second coil conductor. 
     
     
         10 . The magnetic material antenna according to  claim 2 ,
 wherein each magnetic material core includes a cutout portion at a portion facing the bend and apart from the first coil conductor or the second coil conductor and the cutout portion is formed such that the width of the magnetic material core tapers off toward the conductor opening section of the first coil conductor or the second coil conductor.   
     
     
         11 . An antenna device comprising:
 the magnetic material antenna according to  claim 1 ; and   a plate adjacent to the magnetic material antenna and including a conductor spreading in a surface direction.