JP2007116347A - Tag antenna and mobile radio equipment - Google Patents

Tag antenna and mobile radio equipment Download PDF

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Publication number
JP2007116347A
JP2007116347A JP2005304466A JP2005304466A JP2007116347A JP 2007116347 A JP2007116347 A JP 2007116347A JP 2005304466 A JP2005304466 A JP 2005304466A JP 2005304466 A JP2005304466 A JP 2005304466A JP 2007116347 A JP2007116347 A JP 2007116347A
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magnetic material
tag antenna
tag
reader
material
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JP2005304466A
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Japanese (ja)
Inventor
Takanori Endo
Tomohiro Mori
智広 森
貴則 遠藤
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Mitsubishi Materials Corp
三菱マテリアル株式会社
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Priority to JP2005304466A priority Critical patent/JP2007116347A/en
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Abstract

A tag antenna excellent in processability capable of suppressing an increase in thickness as much as possible and suppressing an influence of a component including a metal material or a component generating noise, and a portable radio device equipped with the tag including the tag antenna Offer.
A tag antenna 8a disposed on the inner surface of a housing such as a portable wireless device with an RFID function is exposed on the surface layer of a magnetic material 10 so that a part of the outer peripheral portion thereof is continuously exposed in the longitudinal direction. The conductive wire 13 is embedded and formed. This suppresses the increase in thickness compared to the conventional structure, suppresses the influence of parts including a metal material disposed on the back surface of the magnetic material 10, and blocks noise from the side as well as below the magnetic material 10. Furthermore, the workability can be improved by integrating the conducting wire 13 and the magnetic material 10.
[Selection] Figure 3

Description

  The present invention relates to an antenna and a portable wireless device, and more particularly to an antenna for an RFID (Radio Frequency Identification) tag that performs data communication with a reader or a reader / writer, and a portable wireless device on which a tag including the antenna is mounted.

  In recent years, RFID systems that perform data communication between a tag including an IC chip and a reader or reader / writer (hereinafter collectively referred to as a reader / writer) have become widespread. Since this RFID system performs data communication using an antenna provided in each of the tag and the reader / writer, communication is possible even if the tag is separated from the reader / writer by several centimeters to several tens of centimeters. Because of its strength in being strong, etc., it has come to be used in various fields such as factory production management, logistics management, and entrance / exit management.

  In the past, this RFID system has been used as a single system. However, in recent years, a structure has been proposed in which an RFID system is incorporated into an existing device and an RFID function is added to the device. Portable wireless devices incorporating tags have also been put into practical use (for example, Patent Document 1 below). In such a portable wireless device, a loop-shaped tag antenna is usually disposed on the inner surface of the housing on the back side of the portable wireless device.

JP 2003-37861 A (page 3-4, FIG. 1)

  In a conventional portable wireless device with an RFID function, a tag antenna formed by winding a conductive wire on a base material such as a plastic film is incorporated on the inner surface of a casing on the back side. Since components containing metal materials such as circuit boards are placed inside, magnetic flux generated by the tag antenna penetrates into the above components, and eddy currents that cancel the magnetic flux flow in the metal materials. Problems such as a decrease in distance occur.

  In addition, since components that generate noise, such as an oscillation circuit, are also arranged inside the casing in which the tag antenna is incorporated, noise is superimposed on the tag antenna, causing a failure in communication with the reader / writer. Such a problem also occurs.

  As a method for solving such a problem, there is a method of inserting a magnetic material between the base material of the tag antenna and a component including the metal material or a component that generates noise. Further, the thickness of the tag antenna increases by the thickness of the magnetic material, which is a big problem for portable wireless devices that are required to be thin.

  Further, in the above structure, it is possible to suppress the influence of components arranged at positions facing the tag antenna via the magnetic material, but in the structure in which the tag antenna is simply arranged on the magnetic material, There is also a problem that the influence of noise from the side of the antenna cannot be suppressed.

  Furthermore, in a structure in which the tag antenna is simply arranged on the magnetic material, the magnetic material and the tag antenna are not integrated, and thus cannot be deformed with the two closely contacting each other, as in a portable wireless device. There is also a problem that the tag antenna cannot be folded and placed inside a device in which various parts are arranged in a complicated manner.

  The present invention has been made in view of the above problems, and its main purpose is to suppress the increase in thickness as much as possible, and to suppress the influence of components including metal materials and components that generate noise, and Another object of the present invention is to provide a tag antenna capable of improving processability and a portable radio device equipped with a tag including the tag antenna.

  Another object of the present invention is to provide a wire that can be used even in an environment where there are parts that generate noise.

  In order to achieve the above object, the present invention provides a tag antenna that performs data communication with a reader or a reader / writer using electromagnetic induction or electromagnetic coupling, and includes a sheet-like magnetic material and a loop-like conductor. The conductive wire is embedded in the surface layer of the magnetic material so that a part of the outer periphery thereof is continuously exposed along the longitudinal direction.

  The present invention also relates to a tag antenna that performs data communication with a reader or reader / writer using electromagnetic induction or electromagnetic coupling, and includes a frame-shaped magnetic material and a loop-shaped coil wound around the frame. The conductive wire is embedded in the surface layer of the magnetic material so that a part of the outer periphery thereof is continuously exposed along the longitudinal direction.

  The present invention also relates to a tag antenna that performs data communication with a reader or a reader / writer using electromagnetic induction or electromagnetic coupling, and a conductive wire is continuously exposed in the longitudinal direction at a part of its outer periphery. Thus, the wire is embedded in the surface layer of an elongated magnetic material, and the wire is wound in a loop shape so that the exposed surface of the conducting wire is substantially constant.

  In this invention, it is preferable that the said conducting wire is embed | buried under the surface layer of the said magnetic material by being pressed by the said heated magnetic material.

  The present invention also relates to a tag antenna that performs data communication with a reader or a reader / writer using electromagnetic induction or electromagnetic coupling, wherein a loop-shaped conductor is disposed on a sheet-shaped magnetic material, and the loop-shaped The surface of the lead wire is covered with a protective material.

  In the present invention, the protective material is preferably formed by spraying a plastic material dissolved in a solvent.

  In the present invention, the magnetic material may be composed of a powdery magnetic material or a composite material of a needle-like magnetic material and plastic or rubber.

  In the portable wireless device of the present invention, the tag antenna described above is disposed on the inner surface of the housing or is bent on the inner surface of the housing.

  In the wire of the present invention, the conducting wire is embedded in the surface layer of an elongated magnetic material so that a part of the outer periphery thereof is continuously exposed along the longitudinal direction.

  As described above, the tag antenna of the present invention is formed by embedding a conductive wire in the surface layer of the magnetic material so that a part of the outer periphery thereof is continuously exposed along the longitudinal direction, and is disposed on the magnetic material. Since the conductive wire is covered with a protective material, the thickness can be reduced as compared with the conventional structure. Moreover, since the influence of the part containing a metal material and the part which generate | occur | produces a noise can be suppressed, the characteristic of a tag antenna can be improved. Furthermore, since the magnetic material and the conducting wire or the magnetic material, the conducting wire and the protective material are integrated, workability can be improved.

  The tag antenna and portable wireless device of the present invention have the following effects.

  The first effect of the present invention is that an increase in the thickness of the tag antenna can be suppressed as much as possible. The reason is that the magnetic material is not arranged on the lower surface of the tag antenna in which the conductive wire is arranged on the base material, but a part of the outer periphery is continuously exposed along the longitudinal direction on the surface layer of the magnetic material. This is because the conductive wire is embedded to form the tag antenna, and the conductive wire arranged on the magnetic material is covered with a protective material to form the tag antenna.

  In addition, the second effect of the present invention is that the influence of components including a metal material can be suppressed. The reason is that the magnetic flux of the tag antenna passes through the magnetic material and does not reach the component disposed at the position facing the tag antenna via the magnetic material, so that the magnetic flux is not attenuated by the component. Because.

  The third effect of the present invention is that the influence of noise can be suppressed. The reason is that noise generated from a component disposed at a position facing the tag antenna via the magnetic material is absorbed by the magnetic material and does not overlap the tag antenna. In addition, in the case of a structure in which the conducting wire constituting the tag antenna is embedded in the magnetic material, noise incident from the side of the tag antenna can be absorbed by the magnetic material.

  The fourth effect of the present invention is that the tag antenna can be disposed at an arbitrary place. The reason is that the tag antenna of the present invention can be bent into an arbitrary shape because the magnetic material and the conductive wire or the magnetic material, the conductive wire and the protective material are integrated.

  As shown in the prior art, portable radio devices having an RFID function have been put into practical use in recent years, and tag antennas are incorporated into the inner surface of the rear case. For example, as shown in FIG. 11A, the tag antenna 8a is formed by winding a conducting wire 13 on a base material 15 such as a plastic film, and the tag 8 is configured by connecting ICs 8b to both ends of the tag antenna 8a. However, in this structure, as shown in FIG. 11B, since the magnetic flux 11 generated by the tag antenna 8a passes through the base material 15, the circuit board 16 disposed below the base material 15 and the like. It is absorbed by a component containing a metal material, causing a problem that the inductance of the tag antenna 8a is reduced and the communication distance is reduced. Further, as shown in FIG. 11 (c), noise generated from an oscillation circuit or the like disposed under the base material 15 passes through the base material 15 and reaches the lead wire 13, so that the noise enters the tag antenna 8a. There is also a problem that the communication is interrupted and the communication with the reader / writer is impaired.

  Therefore, as shown in FIG. 12A, the magnetic material 10 can be disposed below the tag antenna 8 a formed by winding the conductive wire 13 on the base material 15. In the case of this structure, as shown in FIG. 12B, the magnetic flux 11 generated by the tag antenna 8a passes through the magnetic material 10 and is emitted from the side surface. In addition, as shown in FIG. 12C, noise generated from an oscillation circuit or the like disposed under the magnetic material 10 can be absorbed by the magnetic material 10 as shown in FIG. it can.

  However, in this structure, since the conducting wire 13 is disposed at a position away from the magnetic material 10, noise incident from the side of the magnetic material 10 reaches the conducting wire 13 and is superimposed on the tag antenna 8a. The influence of noise cannot be reliably suppressed. Further, in the case of this structure, the total thickness is the sum of the diameter of the conductive wire 13, the thickness of the base material 15, and the thickness of the magnetic material 10, so that it can be placed inside a portable wireless device that is required to be thin. There is also the problem of becoming difficult. Furthermore, since the tag antenna 8a formed by winding the conducting wire 13 on the base material 15 and the magnetic material 10 are separate structures, they cannot be bent together, and the base material 15 and the magnetic material 10 are not bent. There is also a problem that a gap is generated between the two and a metal material and noise is easily affected.

  Therefore, in the present invention, instead of arranging the tag antenna 8a formed by winding the conductive wire 13 on the base material 15 on the magnetic material 10, the tag antenna 8a is placed on the surface layer of the magnetic material 10 on the outer periphery thereof. The conductive wire 13 is embedded so that a part thereof is continuously exposed along the longitudinal direction. This suppresses the increase in thickness compared to the conventional structure, suppresses the influence of the metal material disposed on the back surface of the magnetic material 10, blocks noise from the side as well as below the magnetic material 10, The workability can be improved by integrating the conducting wire 13 and the magnetic material 10.

  Moreover, it is set as the structure which arrange | positions the conducting wire 13 on the magnetic material 10, and sprays a protective material on the surface and integrates it. In the case of this structure, the noise from the side cannot be completely blocked, but the conducting wire 13 can be brought into close contact with the magnetic material 10 as compared with the conventional structure shown in FIG. Can be blocked. Moreover, since the total thickness is the sum of the thickness of the protective material and the thickness of the magnetic material 10, an increase in thickness can be suppressed as compared with the conventional structure, and the protective material and the magnetic material 10 are integrated. Therefore, workability can also be improved.

  In order to describe the above-described embodiment in more detail, a tag antenna and a portable wireless device according to an example of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing the external appearance of the front and back surfaces of a portable radio device with an RFID function to which a tag having a tag antenna according to the present embodiment is attached, and FIG. 2 is a block diagram showing the configuration of the RFID system. . Moreover, FIG. 3 is a figure which shows the structure of the tag of a present Example typically, and FIG.4 and FIG.5 is a figure which shows the variation. FIG. 6 is a diagram schematically showing the structure of the wire of this example, and FIG. 7 is a diagram schematically showing another structure of the tag of this example. 8 to 10 are diagrams schematically showing a method for manufacturing the tag antenna (wire) of the present embodiment.

  As shown in FIG. 1, a portable wireless device 1 with an RFID function according to the present embodiment includes an upper housing 2 including a display unit 5 such as a liquid crystal display device or an organic EL display device, a lens for a digital camera function, etc., and a special key. In order to realize various functions of the portable wireless device 1 (functions such as voice call, mail transmission / reception, web browsing, photo shooting, music playback, etc.) Are disposed on the inner surface on the back side of the lower housing 3, the lower housing 3 in which the circuit, the battery, and the like are housed, the upper housing 2 and the lower housing 3 that can be opened and closed. The tag 8 includes a tag antenna 8a and an IC 8b, and a retractable whip antenna 7 having one end held in one housing.

  Note that FIG. 1 is an example, and an arbitrary portable radio device such as an integrated portable wireless device or a portable wireless device having a biaxial hinge structure in which an upper housing 2 and a lower housing 3 are supported to be openable and closable and rotatable. The structure can be applied to a portable wireless device having a structure, and the configuration and arrangement of each component such as the display unit 5, the operation unit 6, and the whip antenna 7 are arbitrary. In FIG. 1, the tag antenna 8a is disposed on substantially the entire back surface of the lower housing 3, but the size and arrangement of the tag antenna 8a are arbitrary, and a part of the back surface of the lower housing 3 (for example, It may be disposed on the lower half or the like, or may be disposed on the inner surface of the upper housing 2 on the back surface side.

  Further, the basic configuration of the RFID system is as shown in FIG. 2, and the tag 8 is not necessarily required when the tag antenna 8a and the capacitor (IC 8b are provided with a capacitor) constituting the resonance circuit, and the capacitor is omitted in this embodiment. And the IC 8b for storing ID information and the like and performing communication control. The reader / writer 9 is a reader / writer antenna 9a that communicates with the tag antenna 8a, and a communication circuit for converting transmission / reception signals. And a circuit unit such as an arithmetic processing unit 9c for decoding a transmission / reception signal.

  Here, as shown in the prior art, when the tag antenna 8a formed by winding a conductive wire on a base material such as a plastic film is arranged on the inner surface on the back surface side of the lower housing 3, the inside of the lower housing 3 Magnetic flux generated in the tag antenna 8a is absorbed by a component including a metal material such as a circuit board disposed in the circuit, or noise generated from a component such as an oscillation circuit is superimposed on the tag antenna 8a to cause a communication failure. Problem arises. In addition, when a magnetic material is disposed on the lower surface of the base material, it is possible to suppress the influence of the metal material and the noise incident from below, but to block the noise incident from the side or oblique side. In addition, there is a problem that the entire thickness increases and it is difficult to bend it into an arbitrary shape.

  Therefore, in this embodiment, as shown in FIG. 3, the lead wire is such that a part of the outer periphery thereof is continuously exposed along the longitudinal direction on the surface layer of the magnetic material 10 (that is, not completely buried). 13 is embedded to form a tag antenna 8a to suppress an increase in thickness. In the case of this structure, as shown in FIG. 3B, the magnetic flux 11 generated by the tag antenna 8 a passes through the inside of the magnetic material 10 and is emitted from the side surface, and is arranged on the lower part of the magnetic material 10. Therefore, it is possible to suppress a decrease in inductance due to the metal material and to prevent a decrease in communication distance. Further, as shown in FIG. 3C, since the conducting wire 13 is embedded in the magnetic material 10, not only noise from below the magnetic material 10 but also noise from the side of the magnetic material 10 is blocked. As a result, the communication characteristics of the tag antenna 8a can be kept good.

  3 is merely an example, and the diameter, the number of turns, the winding method, the interval, the exposure amount, the arrangement of the IC 8b, and the like of the conductive wire 13 constituting the tag antenna 8a are not limited. In addition, the conductor 13 may or may not be covered with an insulating material. However, if the conductor 13 is not covered with an insulating material, a predetermined insulation treatment (for example, between the magnetic material 10 and a portion where the conducting wire 13 intersects) (for example, It is preferable to apply an insulating material. In addition, although the magnetic material 10 is rectangular here, the shape of the magnetic material 10 can be appropriately changed in accordance with the winding shape of the conducting wire 13. For example, when the conducting wire 13 is spirally wound, The magnetic material 10 may be circular.

  The tag antenna 8a having the above structure can be manufactured, for example, by a method as shown in FIG. First, as shown in FIG. 8A, a sheet-like magnetic material 10 having heat softening properties is prepared, and a tag antenna 8a is formed on the magnetic material 10 as shown in FIG. 8B. One or a plurality of conducting wires 13 are arranged, and the conducting wires 13 are pressed downward while heating to a temperature at which the magnetic material 10 is softened. Then, the conducting wire 13 sinks into the magnetic material 10, and as shown in FIG. 8C, the conducting wire 13 is exposed on the surface layer of the magnetic material 10 so that a part of the outer periphery thereof is continuously exposed along the longitudinal direction. Is embedded in the tag antenna 8a.

  The material of the magnetic material 10 is not particularly limited. For example, it is preferable to use a material obtained by combining fine magnetic metal powder with plastic or rubber. This fine powdered magnetic metal is linked in a chain shape due to spontaneous magnetization. When the powdered magnetic metal is combined with plastic or rubber and stretched in one direction, the aggregate of the chained powdered magnetic metal is When the magnetic field is applied in the direction in which the material is extended because the materials are aligned in the extended direction, the magnetic flux passes through the aggregate of the chain-like powdered magnetic metals, so that the permeability in the extended direction can be increased. Further, instead of powdered magnetic metal, needle-shaped magnetic metal combined with plastic or rubber may be used. Instead of the above manufacturing method, a tag antenna 8a having the same shape may be manufactured by pouring a magnetic material melted by heat into a mold in which the conducting wire 13 is arranged. As shown in FIG. A concave portion 10a having a predetermined depth is formed on the surface of the sheet-like magnetic material 10, and as shown in FIG. 9B, a conductive wire 13 is embedded in the concave portion 10a to produce a tag antenna 8a having the same shape. Also good.

  Also, the flat tag antenna 8a shown in FIG. 3 may be disposed on the inner surface of the casing of the portable wireless device (for example, the back side of the lower casing 3). Since the components are arranged, the flat shape may interfere with the components, and the shape of the antenna may be changed in order to extend the communication distance of the tag antenna 8a or expand the communication range. In such a case, the tag antenna 8a will be deformed, but in the conventional structure shown in FIG. 12, the tag antenna 8a and the magnetic material 10 are separate structures, so that deformation is difficult, When deformed, there is a problem that the base material 15 and the magnetic material 10 are separated. However, in the case of the structure of the present embodiment, the tag antenna 8a is embedded and integrated in the magnetic material 10, and can be deformed into an arbitrary shape. For example, as shown in FIG. Both end portions can be bent, the tag antenna 8a can be reliably disposed even for a device having a complicated structure, and desired antenna characteristics can be obtained.

  3 and 4, the conductive wire 13 is embedded in the sheet-like magnetic material 10 to form the tag antenna 8a. However, the magnetic material 10 may have any shape as long as the conductive wire 13 can be embedded. As shown in the figure, a frame shape in which the central portion is hollowed out (a ring shape when the conductive wire 13 is wound in a spiral shape) can also be used. In the case of this structure, similarly to the structure of FIG. 3, the influence of the metal material below the magnetic material 10 and the influence of noise from below and from the side of the magnetic material 10 can be suppressed, and the width of the magnetic material 10 Therefore, the spread of the magnetic flux 11 can be suppressed, and thereby the directivity of the tag antenna 8a can be increased.

  In FIG. 5, the conductive wire 13 is embedded in the frame-shaped magnetic material 10. For example, as shown in FIG. 6, a wire in which the conductive wire 13 is embedded in the elongated magnetic material 10 is formed, and the wire is wound. A tag antenna 8a having a similar structure can also be created. In the case of this structure, similarly to the structure of FIG. 3, it is possible to suppress the influence of the metal material below the magnetic material 10 and the influence of noise from below and from the side of the magnetic material 10. Since the width can be further reduced, the directivity of the tag antenna 8a can be further increased. In addition, the wire of this structure can be used not only for the purpose of manufacturing the tag antenna 8a but also for wiring in a device in which a component that generates noise exists.

  3 to 6, the conducting wire 13 is embedded in the magnetic material 10. However, for example, as shown in FIG. 7, the conducting wire 13 is disposed on the magnetic material 10 and covers the conducting wire 13. It can also be set as the structure which forms. Also in this structure, as shown in FIG. 7B, the magnetic flux 11 generated by the tag antenna 8a passes through the inside of the magnetic material 10 and exits from the side surface, so that it is disposed below the magnetic material 13. A decrease in inductance due to the metal material can be suppressed, and a decrease in communication distance can be prevented. Moreover, as shown in FIG.7 (c), the noise which injects from the downward direction of the magnetic material 10 can be interrupted | blocked by the magnetic material 10, and a communication characteristic can be kept favorable. However, in the structure of FIG. 7, since the conductive wire 13 is not embedded in the magnetic material 10, noise from the side of the magnetic material 10 cannot be blocked, but it is radiated from the components arranged below the magnetic material 10. The noise reflected from the wall surface of the housing and incident from obliquely below can be blocked, and the noise can be effectively blocked as compared with the conventional structure shown in FIG.

  The tag antenna 8a having the above structure can be manufactured, for example, by a method as shown in FIG. First, as shown in FIG. 10 (a), a sheet-like magnetic material 10 is prepared, and as shown in FIG. 10 (b), the conductor 13 constituting the tag antenna 8a is arranged on the magnetic material 10. Thereafter, a protective material dissolved in a predetermined solvent is sprayed. Then, a protective material is attached so as to cover the conductive wire 13, and the tag antenna 8 a whose conductive wire 13 is arranged on the magnetic material 10 and whose surface is covered with the protective material 14 as shown in FIG. It is formed.

  In addition, although the material of the protective material 14 is not specifically limited, Acrylic, PETG (glycol modified polyethylene terephthalate), a polycarbonate etc. can be used, for example. Further, instead of the above manufacturing method, a tag antenna 8a having the same shape can be manufactured by coating a protective material dissolved by heat on the magnetic material 10 on which the conductive wires 13 are arranged.

  Thus, since the tag antenna 8a of the present embodiment is formed by embedding the conductive wire 13 in the surface layer of the magnetic material 10 so that a part of the outer periphery thereof is continuously exposed along the longitudinal direction, The increase in thickness can be suppressed as much as possible, and the influence of components including a metal material such as a circuit board disposed under the magnetic material 10 can be suppressed, and the influence of noise incident from below and on the side of the magnetic material 10 can also be suppressed. Furthermore, since the conducting wire 13 and the magnetic material 10 are integrated, workability can be improved. Further, even in a structure in which the conductor 13 is disposed on the magnetic material 10 and the protective material 14 is covered, the increase in thickness can be suppressed as much as possible, and the influence of the metal material can be suppressed. In addition, since the conducting wire 13, the magnetic material 10, and the protective material 14 are integrated, workability can be improved.

  In the above-described embodiment, the tag antenna 8a disposed in the portable wireless device has been described. However, the present invention is not limited to the above-described embodiment, and the tag antenna 8a disposed in other devices is also described. The present invention can be similarly applied, and can also be similarly applied to the reader / writer antenna 9a. Further, the antenna structure of this embodiment is not limited to the RFID antenna, but can be applied to any loop-shaped antenna disposed in a place susceptible to noise. Furthermore, the structure of the present embodiment can also be applied to wiring arranged in a place that is susceptible to noise.

  The present invention is not limited to a mobile phone, and can be similarly applied to an arbitrary wireless communication device having an RFID function, such as a PHS, a transceiver, and a mobile terminal device having a wireless communication function.

It is a figure which shows the external appearance structure of the front surface and back surface of the portable wireless device with an RFID function which concerns on one Example of this invention. It is a block diagram which shows the structure of an RFID system. It is a figure which shows typically the structure of the tag antenna which concerns on one Example of this invention, (a) is a perspective view, (b), (c) is sectional drawing in a X-X 'line | wire. It is a perspective view which shows the variation of the structure of the tag antenna which concerns on one Example of this invention. It is a figure which shows the variation of the structure of the tag antenna which concerns on one Example of this invention, (a) is a perspective view, (b), (c) is sectional drawing in a X-X 'line | wire. It is a figure which shows typically the structure of the wire which concerns on one Example of this invention, (a) is a perspective view, (b), (c) is sectional drawing in a X-X 'line | wire. It is a figure which shows the variation of the structure of the tag antenna which concerns on one Example of this invention, (a) is a perspective view, (b), (c) is sectional drawing in a X-X 'line | wire. It is sectional drawing which shows typically the manufacturing method of the tag antenna which concerns on one Example of this invention. It is sectional drawing which shows typically the other manufacturing method of the tag antenna which concerns on one Example of this invention. It is sectional drawing which shows typically the other manufacturing method of the tag antenna which concerns on one Example of this invention. It is a figure which shows the structure of the conventional tag antenna typically, (a) is a perspective view, (b), (c) is sectional drawing in a X-X 'line | wire. It is a figure which shows the structure of the conventional tag antenna typically, (a) is a perspective view, (b), (c) is sectional drawing in a X-X 'line | wire.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Portable radio equipment with RFID function 2 Upper housing | casing 3 Lower housing | casing 4 Hinge part 5 Display part 6 Operation part 7 Whip antenna 8 Tag 8a Tag antenna 8b IC
DESCRIPTION OF SYMBOLS 9 Reader / writer 9a Reader / writer antenna 9b Communication circuit part 9c Arithmetic processing part 10 Magnetic material 10a Recessed part 11 Magnetic flux 13 Conductive wire 14 Protective material 15 Base material 16 Circuit board

Claims (10)

  1. An antenna for a tag that performs data communication with a reader or reader / writer using electromagnetic induction or electromagnetic coupling,
    It consists of a sheet-like magnetic material and a loop-shaped conductor,
    The tag antenna, wherein the conductor is embedded in a surface layer of the magnetic material so that a part of the outer periphery thereof is continuously exposed along the longitudinal direction.
  2. An antenna for a tag that performs data communication with a reader or reader / writer using electromagnetic induction or electromagnetic coupling,
    It is composed of a frame-shaped magnetic material, and a loop-shaped conductor wound around the frame,
    The tag antenna, wherein the conductor is embedded in a surface layer of the magnetic material so that a part of the outer periphery thereof is continuously exposed along the longitudinal direction.
  3. An antenna for a tag that performs data communication with a reader or reader / writer using electromagnetic induction or electromagnetic coupling,
    The conducting wire is composed of a wire embedded in the surface layer of an elongated magnetic material so that a part of the outer periphery thereof is continuously exposed along the longitudinal direction,
    The tag antenna, wherein the wire is wound in a loop shape so that an exposed surface of the conducting wire is substantially constant.
  4.   4. The tag antenna according to claim 1, wherein the conducting wire is embedded in a surface layer of the magnetic material by being pressed by the heated magnetic material. 5.
  5. An antenna for a tag that performs data communication with a reader or reader / writer using electromagnetic induction or electromagnetic coupling,
    A tag antenna, wherein a loop-shaped conductor is disposed on a sheet-shaped magnetic material, and a surface of the loop-shaped conductor is covered with a protective material.
  6.   The tag antenna according to claim 5, wherein the protective material is formed by spraying a plastic material dissolved in a solvent.
  7.   The tag antenna according to any one of claims 1 to 6, wherein the magnetic material comprises a powdery magnetic material or a composite material of a needle-like magnetic material and plastic or rubber.
  8.   A portable radio having an RFID function, wherein the tag antenna according to any one of claims 1 to 7 is disposed on an inner surface of a housing.
  9.   A portable wireless device with an RFID function, wherein the tag antenna according to any one of claims 1 to 7 is bent and disposed on an inner surface of a housing.
  10.   A wire characterized in that a conducting wire is embedded in a surface layer of an elongated magnetic material so that a part of the outer periphery thereof is continuously exposed along the longitudinal direction.
JP2005304466A 2005-10-19 2005-10-19 Tag antenna and mobile radio equipment Pending JP2007116347A (en)

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JP2011097657A (en) * 2009-04-21 2011-05-12 Murata Mfg Co Ltd Antenna apparatus and electronic device
JP2011239368A (en) * 2010-05-11 2011-11-24 Samsung Electro-Mechanics Co Ltd Electronic device case in which low frequency antenna pattern is embedded, and die and method for manufacturing the same
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