JP4530140B2 - Soft magnetic material and antenna device using the same - Google Patents

Soft magnetic material and antenna device using the same Download PDF

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JP4530140B2
JP4530140B2 JP2004189046A JP2004189046A JP4530140B2 JP 4530140 B2 JP4530140 B2 JP 4530140B2 JP 2004189046 A JP2004189046 A JP 2004189046A JP 2004189046 A JP2004189046 A JP 2004189046A JP 4530140 B2 JP4530140 B2 JP 4530140B2
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soft magnetic
antenna
antenna device
magnetic body
device according
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JP2006013976A (en
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弘 栗原
隆 田中
満 織田
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Tdk株式会社
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Description

  The present invention relates to a soft magnetic body disposed behind an antenna in order to reduce the influence of a good conductor such as metal in a wireless communication system using an RFID tag, a non-contact IC card, and the like, and an antenna device using the soft magnetic body About.

  In recent years, wireless communication systems using RFID technology have attracted attention. This communication system is generally composed of a data carrier capable of storing various data and a reader / writer that reads and writes (reads / writes) information without contact with the data carrier. The data carrier is called an RFID tag (wireless IC tag), a non-contact IC card, or the like according to its shape, size, etc. (hereinafter collectively referred to as a non-contact IC card). Radio frequency bands used for this non-contact IC card include a band of 135 kHz or less, a 13.56 MHz band, a 2.45 GHz band, and the like. This non-contact IC card is used for various entry / exit managements such as an automatic ticket gate of a transportation facility because it is easy for a user to handle. In addition, applications to electronic money and article management are also being studied.

  These non-contact IC cards and reader / writers generally have a built-in loop antenna, and electric power is supplied to the non-contact IC card by electromagnetic induction via electromagnetic waves generated by the reader / writer antenna, and data read / write is performed. Writing is performed.

  When these antennas are made of a good conductor such as metal (for example, when a non-contact IC card is attached to a metal article, the reader / writer circuit board is in the immediate vicinity of the antenna) Since a part of electric power is lost due to an eddy current generated on the surface of a good conductor, there is a problem that a communication distance is shortened.

  As a countermeasure, in Patent Document 1 below, in a system in which communication is performed at several hundred kHz or less, a soft magnetic material having a high relative permeability is mounted on the back surface of the reader / writer to improve the antenna characteristics of the reader / writer. Has been proposed.

  Patent Document 2 below proposes improving the antenna characteristics of a non-contact IC card by inserting a soft magnetic member between the antenna and the article in the non-contact IC card.

Japanese Patent Laid-Open No. 9-284038 JP 2002-290131 A

  In the prior art of Patent Document 1, only a low frequency band of several hundred kHz or less is considered, and the soft magnetic material to be inserted has an effective relative permeability of 100 or more. This does not correspond to a communication frequency in the MHz band currently used, for example, a high frequency such as the 13.56 MHz band. Furthermore, as will be described in detail later, due to the results of research by the present inventors, the antenna characteristics increase logarithmically as the real part of the relative permeability increases, and the soft magnetic material to be inserted is It turned out that it depends not only on the real part of the relative permeability but also on the imaginary part. As a result, it was found that the relationship between both the real part and the imaginary part of the complex relative permeability is important for the soft magnetic material used for the soft magnetic material to be inserted. In particular, considering the actual use, a soft magnetic material to be inserted is often a composite magnetic material in which a soft magnetic material powder, flakes, and the like are mixed and dispersed in a resin because of easy handling. When a composite magnetic body is used, the imaginary part of the complex relative permeability does not cause a problem in communication of several hundreds of kHz or less described in Patent Document 1, but when trying to use the communication in the 13.56 MHz band, the composite magnetic body Since the imaginary part of the permeability becomes large in the MHz band, it needs to be considered.

  Further, in the prior art of Patent Document 2, it is described that it is preferable that the product of the magnetic permeability and the thickness is large. However, similarly to Patent Document 1, there is no description regarding the imaginary part of the magnetic permeability. The guideline for selecting the soft magnetic member used in the card is not correctly expressed.

  In view of the above points, the present invention is arranged in a wireless communication system using a non-contact IC card, a reader / writer, etc., so that the influence of a good conductor such as metal is reduced by being arranged behind the antenna, thereby improving antenna characteristics. An object of the present invention is to provide a soft magnetic body for an antenna device capable of improving the communication distance.

  Further, the present invention provides a wireless communication system using a non-contact IC card, a reader / writer, etc., which reduces the influence of a good conductor such as metal by arranging the soft magnetic material behind the antenna, thereby improving the antenna characteristics, Another object is to provide an antenna device capable of improving the communication distance.

  Other objects and novel features of the present invention will be clarified in embodiments described later.

In order to achieve the above object, a soft magnetic body for an antenna device according to the present invention is disposed behind an antenna that radiates an electromagnetic wave to a communication target side or receives an electromagnetic wave from the communication target side. ,
When the function f of the complex relative permeability and thickness at the communication frequency in the MHz band is expressed by the following formula (1),
The value of the function f is 200 or more.

  In the soft magnetic body for an antenna device, it is more preferable to set the value of the function f to 316 or more.

  In the antenna device soft magnetic body, the real part of the complex relative permeability at the communication frequency may be 300 or less.

  In the soft magnetic body for an antenna device, it is more preferable that the thickness of the soft magnetic body is 0.5 mm or less and the condition of the function f is satisfied.

  When the antenna has a loop shape, the soft magnetic body for the antenna device may have a hollow shape by providing a hole corresponding to the inner peripheral portion of the antenna.

  The soft magnetic body for the antenna device may include any soft magnetic material of amorphous alloy, permalloy, electromagnetic steel, silicon steel, Sendust alloy, Fe—Al alloy, or soft magnetic ferrite.

  The soft magnetic body for the antenna device may be a composite material of a soft magnetic metal or soft magnetic ferrite powder or flake and a binder, or a soft magnetic metal or soft magnetic ferrite powder or flake. It may be a coating film of the paint to be included. Further, it may be a soft magnetic metal or soft magnetic ferrite powder or flake green compact.

The antenna device according to the present invention includes at least an antenna that radiates electromagnetic waves to a communication target side and a circuit board that controls the antenna.
The antenna device soft magnetic material is arranged between the antenna and the circuit board on the opposite side of the electromagnetic wave radiation direction.

In addition, another antenna device according to the present invention includes at least an IC chip storing unique information and an antenna electrically connected to the IC chip.
The antenna device soft magnetic material is arranged between the antenna on the opposite side of the electromagnetic wave radiation direction and an article to which the IC chip is attached.

  In the antenna device, the antenna may be formed directly on the surface of the soft magnetic material, or the antenna and the soft magnetic material may be arranged at intervals without contacting each other.

  The antenna pattern and the capacitor may be set so as to obtain a predetermined frequency characteristic value with the soft magnetic body mounted.

  When the antenna device includes a circuit board, the antenna pattern and the capacitor may be set so as to obtain a predetermined frequency characteristic value in a state where the soft magnetic body and the circuit board are arranged.

  Further, when the antenna device has an IC chip to be attached to an article, the antenna pattern and the capacitor are set so as to obtain a predetermined frequency characteristic value in a state where the soft magnetic body and the IC chip are attached to the article. It is good to be.

  The antenna pattern and the capacitor are arranged so that a good conductor is further disposed on the surface of the soft magnetic body opposite to the antenna side, and a predetermined frequency characteristic value is obtained in a state where the soft magnetic body and the good conductor are disposed. May be set.

  An insulating layer may be further disposed on the surface of the good conductor opposite to the soft magnetic material.

  According to the soft magnetic body for an antenna device according to the present invention, when the complex relative permeability and the function f of the thickness at the communication frequency in the MHz band (particularly several MHz to several tens of MHz) are expressed by the above-described formula (1). Since the value of the function f is 200 or more, the soft magnetic material for the antenna device is behind the antenna that radiates electromagnetic waves to the communication target side or receives electromagnetic waves from the communication target side (opposite side of the communication target side). When the body is placed, the influence of a good conductor such as metal can be reduced. That is, it is possible to reduce eddy current loss generated in a good conductor and improve antenna characteristics and communication distance.

  Further, according to the antenna device according to the present invention, when the function f of the complex relative permeability and the thickness at the communication frequency in the MHz band (especially several MHz to several tens of MHz) is expressed by the above-described formula (1), Since the soft magnetic material having a function f value of 200 or more is arranged behind the antenna (opposite the communication target side), the influence of a good conductor such as metal can be reduced, that is, eddy current loss generated in the good conductor can be reduced. It is possible to reduce. As a result, the antenna characteristics can be improved and the communication distance can be improved, and a communication environment superior to the conventional one can be realized.

  Hereinafter, as the best mode for carrying out the present invention, embodiments of a soft magnetic material and an antenna device using the same will be described with reference to the drawings.

  FIG. 1 shows a first embodiment of the present invention, which is a case where a reader / writer 1 is configured. The antenna device includes an antenna substrate 5, a circuit substrate 10, and a soft magnetic body 20.

  The antenna substrate 5 is formed by forming a good conductor pattern to be a loop antenna on an insulating substrate. The loop antenna radiates electromagnetic waves to the communication target side (non-contact IC card) and receives electromagnetic waves from the communication target side. It has a function.

  The circuit board 10 controls an antenna provided on the antenna board 5, and includes a transmitter that transmits a high-frequency transmission signal to the antenna and a receiver that receives a high-frequency reception signal received by the antenna. The circuit board 10 can be considered to be mostly metal, and is arranged behind the antenna board 5, that is, on the side opposite to the electromagnetic wave radiation direction (the side opposite to the communication target side).

  The antenna device soft magnetic body 20 is a thin plate having a uniform thickness, and is inserted and disposed between the antenna substrate 5 and the circuit substrate 10 on the opposite side of the antenna substrate 5 in the electromagnetic wave radiation direction. Here, when the communication frequency with the communication target is in the MHz band, particularly several MHz to several tens of MHz including 13.56 MHz, not only the real part of the complex relative permeability of the soft magnetic body 20 but also the value of the imaginary part. Even consideration must be paid.

  The present inventors have studied the effect of the soft magnetic body for an antenna device inserted into the antenna device by simulation, and the results will be described in detail below.

The antenna device having the dimensions and shape entered in FIG. 1 was used as a simulation model (analysis model). That is,
Analysis space: 280mm x 260mm x 200mm
Input power: 1W
Antenna substrate: long side 55mm x short side 33mm x thickness 0.5mm
Soft magnetic material: long side 55 mm × short side 33 mm × thickness 0.25 mm to 1 mm
Circuit board: Long side 80mm x Short side 55mm x Thickness 1mm
This simulation model assumes an antenna device for communication at 13.56 MHz, and the size and configuration of the antenna substrate 5 and the circuit substrate 10 use the shape of a general reader / writer. In this simulation model, the antenna device has an optimal frequency characteristic in a state where the soft magnetic body 20 and the circuit board 10 are arranged on the back surface (so that optimal communication can be performed at 13.56 MHz). The coil pattern (number of turns, coil diameter, etc.) of the loop antenna and the capacitor (provided on the antenna substrate or the circuit substrate) constituting the resonance circuit are adjusted (set). Regarding the comparison of the characteristics of the antenna device below, the comparison is made with the magnetic field intensity above 100 mm from the center of the antenna device in the electromagnetic wave radiation direction.

(a) Analysis result of real part of complex relative permeability in soft magnetic body The thickness of the soft magnetic body 20 is 0.5 mm, the imaginary part of the complex relative permeability is 0, and the real part is 1 to 500 FIG. 2 shows a change in magnetic field intensity in the sky 100 mm above the antenna device when changed. From FIG. 2, it can be confirmed that as the real part of the complex relative permeability of the soft magnetic material increases, the characteristics of the antenna device increase, and the increase in the characteristics is logarithmic. From this, it was confirmed that even if the magnetic permeability was increased to some extent, the increase in the effect was low. In consideration of the price of the magnetic material to be used, it can be said that the real part of the complex relative permeability is up to 300 or less.

(b) Analysis results on the imaginary part of the thickness of the soft magnetic body and the complex relative permeability The thickness t of the soft magnetic body 20 is set to 0.25 mm, 0.5 mm, and 1 mm, and the real part of the complex relative permeability ( FIG. 3 shows the magnetic field strength when the imaginary part is changed when μr ′) is 20, 40, and 60. Here, the horizontal axis of FIG. 3 indicates tan δ (imaginary part / real part). From FIG. 3, it was confirmed that when the imaginary part is 0, the characteristics of the antenna device increase in proportion to the product of the real part and the thickness of the soft magnetic material. However, it was confirmed that the drop in the characteristics of the soft magnetic material with respect to the increase in the imaginary part of the complex relative permeability appears more markedly as the soft magnetic material is thicker and the real part is smaller. That is, it can be said that it is necessary to consider the balance of the real part, the imaginary part, and the thickness of the complex relative permeability in order to use the soft magnetic material efficiently.

(c) In order to make the characteristics of the antenna device easier to understand, the magnetic field strength at 100 mm above the antenna device is expressed as a ratio (hereinafter referred to as magnetic field strength ratio [%]) to the magnetic field strength when the soft magnetic body 20 is not present on the back surface. From the above relationship, it was confirmed that the relationship between the thickness of the soft magnetic material and the magnetic field strength ratio f with respect to the real part and the imaginary part of the complex permeability is expressed by the following expression (1). .
Here, it has been confirmed that the correlation coefficient of the magnetic field strength ratio f obtained from the above result and the equation (1) has a high correlation of 0.99.

  Using this equation (1), distribution diagrams of the magnetic field strength ratio f with the real part of the complex permeability on the vertical axis and tan δ on the horizontal axis are shown for each thickness of the soft magnetic material in FIGS. . FIG. 4 shows the case where the thickness t of the soft magnetic material t = 0.25 mm, FIG. 5 shows the case where the thickness t = 0.5 mm, and FIG. 6 shows the case where the thickness t = 1.0 mm.

  In consideration of actual use, the higher the magnetic field strength ratio in the sky above 100 mm, the better. However, if it is practically 200% or more (an increase of 6 dB compared to the case without a soft magnetic material), it can be said that there is a merit by mounting a soft magnetic material. Further, if it is 316% or more (increase by 10 dB as compared with the case without soft magnetic material), better communication is possible, so that it is more practical. That is, it is desirable to use a soft magnetic material having a real part, an imaginary part, and a thickness of a complex magnetic permeability where the value f derived from the expression (1) is 200 or more, and the value f of the expression (1) is It can be seen that it is more desirable to set the value to be 316 or higher.

  In consideration of actual use, it is more desirable that the thickness of the soft magnetic material is 0.5 mm or less and the value of the function f satisfies the above condition from the viewpoint of reducing the thickness of the antenna device.

  According to the first embodiment, the following effects can be obtained.

(1) Between an antenna substrate 5 on which an antenna that radiates electromagnetic waves to a communication target (for example, a non-contact IC card) side and receives electromagnetic waves from the communication target side, and a circuit board 10 that controls the antenna In addition, since the soft magnetic body 20 in which the value of the magnetic field strength ratio f of the above formula (1) is 200 or more in the communication frequency band (MHz band, particularly several MHz to several tens of MHz including 13.56 MHz) is arranged, It is possible to reduce the phenomenon that an eddy current or the like is generated in the circuit board 10 including the metal surface due to the emission of electromagnetic waves. For this reason, loss of communication power can be reduced, and antenna sensitivity and communication distance can be improved.

(2) If the value of the magnetic field strength ratio f in the above formula (1) can be set to 316 or more, the antenna sensitivity and communication distance can be further improved.

(3) If the value of the magnetic field strength ratio f of the above formula (1) satisfies 200 or more (more preferably 316 or more), the soft magnetic material 20 is not limited in the soft magnetic material used. , Amorphous alloy, permalloy, electromagnetic steel, silicon steel, sendust alloy, Fe-Al alloy or soft magnetic ferrite soft magnetic material itself, or a composite magnetic body containing those soft magnetic materials Also good. Examples of the composite magnetic material include a composite material of soft magnetic metal or soft magnetic ferrite powder or flake and a binder (plastic or rubber), or a paint containing soft magnetic metal or soft magnetic ferrite powder or flake. The case where it comprises with a coating film is mentioned. Further, a soft magnetic metal or soft magnetic ferrite powder or flake green compact may be used as the soft magnetic body 20.

  FIG. 7 shows a second embodiment of the present invention, which is a case where a non-contact IC card 2 is configured. The antenna apparatus includes an antenna substrate 5, an IC chip 30, and a soft magnetic body 20. The antenna device is attached to the article 40 to be identified.

  The antenna substrate 5 is formed by forming a good conductor pattern to be a loop antenna on an insulating substrate, and the loop antenna has a function of receiving electromagnetic waves from the communication target side (reader / writer) and emitting electromagnetic waves to the communication target side. Have.

  The IC chip 30 stores unique information for each article 40 to which the antenna device is attached, and the IC chip 30 and the antenna are electrically connected.

  Other configurations are the same as those of the first embodiment described above, and the same or corresponding parts are denoted by the same reference numerals and description thereof is omitted.

  Even when the non-contact IC card 2 according to the second embodiment is configured, the soft magnetic body 20 that is inserted and arranged between the antenna substrate 5 and the article 40 on the opposite side of the antenna substrate 5 in the electromagnetic wave radiation direction is described above. The same effect as that of the first embodiment described above can be obtained by using a magnetic field intensity ratio f of formula (1) that is 200 or more (more preferably 316 or more). That is, even when the article 40 is a good conductor such as a metal, the soft magnetic body 20 is interposed between the antenna substrate 5 and the article 40, and a vortex is generated in the article 40 that is a good conductor as electromagnetic waves are emitted. It is possible to reduce a phenomenon in which current or the like is generated, and it is possible to improve antenna sensitivity and communication distance.

  If the article 40 is an insulator, since the presence or absence of the article 40 hardly affects the frequency characteristics of the resonance circuit composed of the loop antenna and the capacitor provided on the antenna substrate 5, the soft magnetic body 20 is attached. The coil pattern of the antenna is obtained so that a predetermined frequency characteristic value is obtained in a state in which the resonance is performed (specifically, the resonance frequency of the resonance circuit including the loop antenna and the capacitor matches the transmission frequency on the reader / writer side). (The number of turns, coil diameter, etc.) and the capacitor may be adjusted (set).

  Further, if the article 40 is a good conductor such as a metal, the presence or absence of the article 40 may affect the frequency characteristics of the resonance circuit composed of the loop antenna and the capacitor provided on the antenna substrate 5, so that it is non-contact. In order to obtain a predetermined frequency characteristic value in a state where the IC card 2 is mounted on the article 40, that is, in a state where the soft magnetic body 20 and the IC chip 30 are attached to the article 40 (specifically, a loop antenna and a capacitor) The coil pattern and the capacitor of the antenna may be set so that the resonance frequency of the resonance circuit consisting of (1) matches the transmission frequency on the reader / writer side.

  FIG. 8 shows a third embodiment of the present invention. In the antenna device of a reader / writer or a non-contact IC card, a loop is formed on the side opposite to the electromagnetic wave radiation direction of the antenna substrate 5 provided with the coil pattern of the loop antenna 5a. A soft magnetic body 20 having a hollow shape is provided by providing a hole 21 corresponding to the inner peripheral portion of the antenna 5a.

  Other configurations are the same as those of the first or second embodiment described above, and a circuit board or an IC chip is not shown.

  In the case of the third embodiment, the above-described formula (1) can be applied by making the width of the soft magnetic body 20 wider than the width of the coil pattern of the loop antenna 5a. And in addition to the effect of Embodiment 1 or 2 mentioned above, since the soft-magnetic body 20 is a hollow shape, reduction of material cost and weight reduction can be achieved.

  FIG. 9 shows a fourth embodiment of the present invention. In an antenna device of a reader / writer or a non-contact IC card, a soft magnetic body 20 is arranged on the side opposite to the electromagnetic wave radiation direction of an antenna substrate 5 provided with an antenna. In addition, a good conductor 50 such as a metal is disposed behind it.

  Other configurations are the same as those of the first or second embodiment described above, and a circuit board or an IC chip is not shown.

  In the case of the fourth embodiment, even if the circuit board of the reader / writer or the article to which the IC chip is to be mounted is a good conductor, the good conductor 50 is provided in advance on the surface opposite to the antenna side of the soft magnetic body 20. Thus, the influence of the circuit board and the article can be almost eliminated. Accordingly, a predetermined frequency characteristic value is obtained in a state where the antenna substrate 5, the soft magnetic body 20, and the good conductor 50 are arranged (specifically, the resonance frequency of the resonance circuit including the loop antenna and the capacitor is the object of communication). The coil pattern and the capacitor of the antenna may be set so as to match the transmission frequency on the side.

  FIG. 10 shows a fifth embodiment of the present invention. In an antenna device of a reader / writer or a non-contact IC card, a soft magnetic body 20 is arranged on the opposite side of the electromagnetic wave radiation direction of the antenna substrate 5 provided with the antenna. Further, a good conductor 50 such as a metal is disposed behind it, and an insulating layer 51 is provided on the surface of the good conductor 50 (on the side opposite to the soft magnetic material side).

  Other configurations are the same as those of the first or second embodiment described above, and a circuit board or an IC chip is not shown.

  In the case of the fifth embodiment, in addition to the operational effects of the fourth embodiment, the surface of the good conductor 50 is covered with the insulating layer 51, so that the good conductor 50 directly contacts the circuit board or the article and is short-circuited. This can be prevented.

  In each of the embodiments described above, the antenna substrate 5 is provided with the loop antenna, and the antenna and the soft magnetic body 20 are not in contact with each other, and the predetermined interval is provided. When the surface of the composite magnetic body is relatively high, the antenna substrate may be omitted and a coil pattern serving as an antenna may be formed directly on the surface of the soft magnetic body 20.

  Although the embodiments of the present invention have been described above, it will be obvious to those skilled in the art that the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the claims.

It is a block diagram which shows Embodiment 1 of the antenna apparatus which concerns on this invention. It is a graph which shows the relationship between the real part of a complex magnetic permeability, and the magnetic field intensity [A / m] in the sky above 100 mm when the structure of the dimension entered in FIG. 1 is used as a simulation model. When the thickness t of the soft magnetic material is 0.25 mm, 0.5 mm, and 1 mm, and the real part (μr ′) of the complex relative permeability is 20, 40, and 60, the imaginary part is changed. It is a graph which shows magnetic field intensity. It is a graph which shows the area | region where the value of the magnetic field intensity ratio f of said Formula (1) becomes 200 or more and 316 or more when the thickness t of a soft-magnetic body is 0.25 mm. It is a graph which shows the area | region where the value of the magnetic field intensity ratio f of said Formula (1) becomes 200 or more and 316 or more when the thickness t of a soft-magnetic body is 0.5 mm. It is a graph which shows the area | region where the value of the magnetic field intensity ratio f of said Formula (1) becomes 200 or more and 316 or more when the thickness t of a soft-magnetic material is 1.0 mm. It is a block diagram which shows Embodiment 2 of this invention. It is a block diagram which shows Embodiment 3 of this invention. It is a block diagram which shows Embodiment 4 of this invention. It is a block diagram which shows Embodiment 5 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reader / writer 2 Non-contact IC card 5 Antenna board 5a Loop antenna 10 Circuit board 20 Soft magnetic material 21 Hole
30 IC chip 40 Article 50 Good conductor 51 Insulating layer

Claims (18)

  1. A soft magnetic material for an antenna device disposed behind an antenna that radiates electromagnetic waves to a communication target side or receives electromagnetic waves from a communication target side,
    When the function f of the complex relative permeability and thickness at the communication frequency in the MHz band is expressed by the following formula (1),
    A soft magnetic material for an antenna device, wherein the value of the function f is 200 or more.
  2.   The soft magnetic body for an antenna device according to claim 1, wherein the value of the function f is 316 or more.
  3.   The soft magnetic body for an antenna device according to claim 1 or 2, wherein a real part of the complex relative permeability at the communication frequency is 300 or less.
  4.   4. The soft magnetic body for an antenna device according to claim 1, wherein the thickness is 0.5 mm or less.
  5.   5. The soft magnetic body for an antenna device according to claim 1, 2, 3, or 4, wherein the antenna has a loop shape and is formed in a hollow shape by providing a hole corresponding to an inner peripheral portion of the antenna.
  6.   6. The soft magnetic body for an antenna device according to claim 1, comprising a soft magnetic material of any one of amorphous alloy, permalloy, electromagnetic steel, silicon steel, Sendust alloy, Fe-Al alloy, and soft magnetic ferrite. .
  7.   7. The soft magnetic material for an antenna device according to claim 1, wherein the soft magnetic material is a composite material of a soft magnetic metal or soft magnetic ferrite powder or flake and a binder.
  8.   7. The soft magnetic body for an antenna device according to claim 1, wherein the soft magnetic body is a coating film of a coating containing powder or flakes of soft magnetic metal or soft magnetic ferrite.
  9.   7. The soft magnetic body for an antenna device according to claim 1, wherein the soft magnetic body is a soft magnetic metal or soft magnetic ferrite powder or flake green compact.
  10. In an antenna device having at least an antenna that radiates electromagnetic waves to a communication target side and a circuit board that controls the antenna,
    10. The soft magnetic material according to claim 1, 2, 3, 4, 5, 6, 7, 8, or 9, wherein the soft magnetic material is disposed between the antenna and the circuit board on the opposite side of the electromagnetic wave radiation direction. An antenna device.
  11. In an antenna device having at least an IC chip storing unique information and an antenna electrically connected to the IC chip,
    The soft magnetic material according to claim 1, 2, 3, 4, 5, 6, 7, 8, or 9 is disposed between the antenna and the article to which the IC chip is attached on the opposite side of the electromagnetic wave radiation direction. An antenna device characterized by comprising:
  12.   The antenna device according to claim 10 or 11, wherein the antenna is formed directly on a surface of the soft magnetic body.
  13.   The antenna device according to claim 10 or 11, wherein the antenna and the soft magnetic material are arranged at intervals without contacting each other.
  14.   The antenna device according to claim 10, 11, 12, or 13, wherein the antenna pattern and the capacitor are set so as to obtain a predetermined frequency characteristic value in a state where the soft magnetic body is mounted.
  15.   The antenna device according to claim 10, wherein the antenna pattern and the capacitor are set so as to obtain a predetermined frequency characteristic value in a state where the soft magnetic body and the circuit board are arranged.
  16.   The antenna device according to claim 11, wherein the antenna pattern and the capacitor are set so as to obtain a predetermined frequency characteristic value in a state where the soft magnetic body and the IC chip are attached to the article.
  17.   The antenna pattern and the capacitor are arranged so that a good conductor is further disposed on the surface of the soft magnetic body opposite to the antenna side, and a predetermined frequency characteristic value is obtained in a state where the soft magnetic body and the good conductor are disposed. The antenna device according to claim 10, 11, 12, or 13.
  18.   The antenna device according to claim 17, wherein an insulating layer is further disposed on a surface of the good conductor opposite to the soft magnetic material side.
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