WO2008020574A1

WO2008020574A1 - Antenna element and method for manufacturing same

Info

Publication number: WO2008020574A1
Application number: PCT/JP2007/065732
Authority: WO
Inventors: Takashi Hasunuma; Keiichiro Nomura; Arata Tanaka; Takaki Naito; Takeshi Kimura
Original assignee: Tyco Electronics Raychem K.K.; Tyco Electronics Amp K.K.
Priority date: 2006-08-14
Filing date: 2007-08-10
Publication date: 2008-02-21
Also published as: EP2063489A1; TW200828679A; JPWO2008020574A1; CN101501930A; KR20090051096A; EP2063489A4

Abstract

Provided is an antennal element which is to be used for a tag configuring a RFID (Radio Frequency Identification) system and can be easily manufactured. An antenna element (10) is provided with (A) a layer-like magnetic element (20) formed of a magnetic composition including a magnetic material and a polymer material, and (B) an antenna wiring (30) arranged on one surface of the layer-like magnetic element.

Description

Specification

Antenna element and manufacturing method thereof

Technical field

The present invention relates to an antenna element, in particular, an antenna element that can be used in an apparatus used in an RFID (Radio Frequency Identification) system, for example, an antenna element that can be used in an IC tag, and an antenna element that is used in a reader / writer. Furthermore, the present invention relates to an electronic device having such an antenna element, for example, a wireless tag or an IC tag (which may be a mobile phone) and a reader / writer used for transmission / reception with the electronic tag. Background art

[0002] RFID systems have begun to be used in various fields, and their convenience has been demonstrated. As a result, it is expected that the convenience of using RFID systems can be enjoyed in many other fields. On the other hand, various problems have been pointed out regarding technologies related to RFID systems, and it is hoped that they will be solved in the future.

[0003] One such problem is the problem of the antennas of tags, readers / writers, etc., which are units constituting an RFID system. Antennas are used to send and receive signals and / or supply power by using electromagnetic induction.

[0004] It is known that such an antenna is greatly affected by the environment in which it is placed. In particular, when a metal article is present near the antenna, an eddy current flows on the metal surface due to the magnetic flux generated by the antenna in the reader / writer, and as a result, the carrier wave is greatly attenuated. The strength of the magnetic flux penetrating may be attenuated and communication may become impossible.

[0005] For the purpose of suppressing the influence caused by such a metal article, it has been proposed to combine a member formed of a magnetic material with an antenna. For example, a non-contact IC card reader / magnet with a flexible sheet-like magnetic material placed under the antenna for the purpose of preventing adverse effects on communications caused by metal articles and reducing the occupied space. A writer has been proposed (see Patent Document 1 below). In this reader / writer, the antenna and sheet-like magnetic material are bonded together with double-sided tape. [0006] Furthermore, non-contact data transmission / reception has an antenna and an IC chip provided on one surface of a base substrate, and a magnetic layer is disposed so as to cover at least one of the antenna and the IC chip. The body has been proposed (see Patent Document 2 below). In this data receiving / transmitting body, it is described that a sufficient induced electromotive force is generated even when the data receiving / transmitting body is covered with a magnetic layer so as to be in contact with an article containing metal.

[0007] In this data transmitting / receiving body, after a metal foil is bonded to a base substrate, an antenna pattern is formed by etching a conductive foil, an IC chip is mounted, and finally a magnetic material is applied. Manufactured by applying and drying 'solidify'.

Patent Document 1: Japanese Patent Laid-Open No. 2002-298095

Patent Document 2: Japanese Unexamined Patent Publication No. 2006-113750

Disclosure of the invention

Problems to be solved by the invention

[0008] The RFID system is expected to be used more widely in portable electronic devices such as mobile phones. For this purpose, the antenna elements included in the tags, readers / writers, etc. that make up the system are used. It is desirable to make it compact, and it is desirable to make it easier to manufacture antenna elements.

Means for solving the problem

[0009] As a result of intensive studies on the antenna element, the above problem is

(A) a layered magnetic element formed from a magnetic composition comprising a magnetic material and a polymer material (eg, a plate-like, sheet-like or film-like magnetic element), and

(B) An antenna element having an antenna wiring disposed on at least one surface of the layered magnetic element

Was found to be solved.

[0010] The present invention is a method of manufacturing an antenna element having a layered magnetic element and an antenna wiring disposed thereon,

(1) obtaining a layered magnetic element from a magnetic composition comprising a magnetic material and a polymer material;

(2) a step of directly attaching a metal foil on at least one surface of the layered magnetic element; And

(3) Provided is a method for manufacturing an antenna element, which includes a step of etching a metal foil to form an antenna wiring having a predetermined pattern. By this manufacturing method, the antenna element of the present invention described above and later can be conveniently manufactured.

[0011] The present invention relates to an electronic device having the antenna element of the present invention described above and below. We also provide readers / writers for sending and receiving with IC tags.

The invention's effect

In the antenna element of the present invention, the antenna wiring is directly attached to the layered magnetic element. Therefore, there is no interposition between the antenna wiring and the layered magnetic element (for example, double-sided adhesive tape, resin layer derived from adhesive), and other elements such as a base substrate are required. Therefore, the antenna element is thinner, so that it can be formed more compactly.

[0013] Furthermore, in the method for manufacturing an antenna element of the present invention, a layered magnetic element having antenna wiring can be obtained by directly attaching a metal foil to the layered magnetic element and then etching it. The attachment of the metal foil to the element is simplified, and since no base material is required, the antenna element can be manufactured more easily.

Brief Description of Drawings

FIG. 1 is a schematic perspective view of an antenna element of the present invention.

[FIG. 2] FIG. 2 shows a flow diagram (process diagram) of the manufacturing method of the antenna element of the present invention.

Explanation of symbols

[0015] 10 · · · antenna element, 20 · · · layered magnetic element, 30 · · · antenna wiring.

BEST MODE FOR CARRYING OUT THE INVENTION

Next, the present invention will be described in more detail with reference to the drawings. FIG. 1 shows a schematic perspective view of the antenna element of the present invention. FIG. 2 schematically shows a manufacturing method of the antenna element of the present invention in a flow sheet.

[0017] The antenna element 10 of the present invention includes a magnetic composition comprising a magnetic material and a polymer material. A layered magnetic element 20 formed from a material, and an antenna wiring 30 disposed on one surface of the layered magnetic element 20. The layered magnetic element 20 may have any suitable shape having a planar spread, for example, a plate shape, a sheet shape, or a film shape. Accordingly, in this specification, the term “surface” means a surface defining such a spread, that is, a main surface, and the layered magnetic element 30 has two surfaces on both sides. Therefore, the antenna element of the present invention includes both an aspect in which the antenna wiring is provided on one surface of the layered magnetic element and an aspect in which the antenna wiring is provided on both surfaces of the layered magnetic element.

[0018] As the magnetic material constituting the layered magnetic element, various magnetic materials proposed as those capable of exhibiting the antenna function (that is, the function of receiving and transmitting and / or the power supply) in the antenna element. Materials can be used. In particular, it is desirable to use a material having a function of converging magnetic flux, that is, a material having excellent magnetic permeability. Specific examples of magnetic materials that are preferably used include iron-cathenium alloys, so-called ferrite magnetic materials, particularly Mn-Zn ferrite, Ni-Zn ferrite, iron-nickel alloy, especially permalloy. Examples thereof include magnetic materials called sendust alloys, amorphous alloys, and preferably iron-based amorphous alloys, particularly those containing Si, B, Cu, and Nb containing Fe as a main component. More specifically, TDK Corporation can use IRL (trade name of TDK Corporation) marketed as a composite electromagnetic shielding material, FineMet marketed by Hitachi Metals Co., Ltd., etc. Such a magnetic material may be in any suitable form, for example granular or flaky.

[0019] The polymer material constituting the magnetic material layer is proposed as an antenna function (that is, a transmission / reception function and / or a power supply function) in the antenna element can be improved in combination with the magnetic material. A variety of polymer materials can be used. In particular, it is desirable to use a polymer material that does not adversely affect or has a positive effect on the magnetic material having the function of converging the magnetic flux. Specifically, the polymer material that is preferably used may be a crystalline polymer or an amorphous polymer. For example, polyethylene (PE), chlorinated polyethylene, polyethylene sulfide ( PPS), polypropylene, poly (vinyl chloride), polyvinylidene fluoride, polystyrene, poly There are thermoplastic polymers such as oxymethylene, ethylene butylacetate copolymer (EVA), ethylene-butynole acrylate copolymer (EBA), polyethylene terephthalate (PET), nylon, attalyl nitrile butadiene styrene terpolymer (ABS). A thermoplastic elastomer can also be used as the polymer material.

[0020] The magnetic composition containing the magnetic material and the polymer material as described above may contain these components in any appropriate ratio as long as the antenna element of the present invention can exhibit the function of the antenna. . For example, the magnetic composition comprises 60-95 parts by weight of magnetic material and 40-5 parts by weight of polymer material, more preferably 75-92 parts by weight of magnetic material and 25-8 parts by weight of polymer material. Comprising. If necessary, the magnetic composition may contain additional components (for example, plasticizers for polymer materials (eg, chlorinated paraffin, epoxidized soybean oil, olefinic wax), organic / inorganic flame retardants, etc.). May include.

In the antenna element of the present invention, the antenna wiring 30 is disposed on one surface of the layered magnetic element 20 as shown in the figure, for example. In another aspect described later, they may be arranged on both surface shapes. In either embodiment, the antenna wiring 30 is directly attached to the layered magnetic element 20. The term “on the surface” means that the antenna wiring protrudes from the surface of the magnetic layered element. The term “directly” means that the antenna wiring and the layered magnetic element are coupled in contact with each other, that is, directly coupled. The antenna wiring may have any suitable shape, for example, a spiral shape (a square spiral shape) as illustrated. Other shapes such as loop, helical, monopole, dipole, patch, slot shape, etc. may be used.

[0022] The antenna element of the present invention appropriately includes necessary electronic components (IC chip, capacitor, chip resistor, etc.) and other wiring necessary for electrical connection with the antenna wiring in addition to the antenna wiring. Good. Such electronic components and other wirings may be arranged on either side of the layered magnetic element as required. In one embodiment, these electronic components and other wiring are present on the surface of the layered magnetic element where the antenna wiring is present. In another aspect, there may be at least a portion of these electronic components and other wiring on the opposite surface of the layered magnetic element, in which case the layered magnetic element is provided with a through hole in which the conductive element (conductive Sex tree Such as grease, resin solder, etc.), or a conductive metal plating layer is formed inside the through hole, and the electrical connection between the antenna wiring existing on the surface of the layered magnetic element and the electronic component and other wiring Secure connection.

[0023] The structure in which the antenna wiring protrudes from the surface of the layered magnetic element as described above is inherently obtained by manufacturing the antenna element according to the present invention described above and below. That is, by attaching a metal foil as a precursor of the antenna wiring on the layered magnetic element, and then etching the metal foil so that only a portion corresponding to the antenna wiring remains, such a structure is obtained. Is obtained.

Therefore, the method for manufacturing an antenna element according to the present invention includes a step of obtaining an antenna element precursor by directly attaching (for example, thermocompression bonding) a metal foil to a layered magnetic element (step (2) in FIG. 2), And an antenna wiring or antenna circuit having a predetermined pattern by etching the metal foil to obtain an antenna element (step (3) in FIG. 3).

[0025] The layered magnetic element can obtain a force S obtained by the step of forming the above-described magnetic composition into a layer (step (1) in FIG. 2). In a preferred embodiment, the layered magnetic element can be obtained in a sheet form by press molding or compression molding. For example, a layered element having a predetermined thickness can be obtained by filling a magnetic composition in a gap corresponding to a predetermined thickness of the layered element and pressurizing / heating the magnetic composition. In another preferred embodiment, the layered magnetic element can be obtained by extruding the magnetic composition under heating, and in this case, it can be a long (or continuous) layered magnetic element. In any of the embodiments, the layered magnetic element in the heated state may be cooled as necessary.

[0026] Therefore, in one embodiment, the method for manufacturing an antenna element of the present invention is as shown in FIG.

(1) A step of extruding a magnetic composition comprising a magnetic material and a polymer material into a layer to obtain an extrudate,

(2) a step of directly attaching a metal foil on the extrudate, and

(3) A step of etching the metal foil to form an antenna wiring having a predetermined pattern.

[0027] Fig. 2 shows a flow diagram of the production method of the present invention. In Fig. 2, the magnetic The process of obtaining a sex composition is also illustrated. In this step, the magnetic material and the polymer material are mixed by an appropriate mixing / kneading means (for example, a Banbury mixer or a twin screw kneader) to obtain a magnetic composition in which they are homogeneously mixed. This composition is molded (eg, extruded) to obtain a layered magnetic element.

[0028] The direct adhesion of the metal foil to the layered magnetic element is preferably carried out by placing the metal foil on the layered magnetic element and performing, for example, thermocompression using a hot press. In this case, when the metal foil is attached to the layered magnetic element manufactured in advance, for example, the layered magnetic element is heated. At least the surface on which the metal foil is placed is heated to at least the softening temperature of the polymer material, preferably to the melting temperature. Regarding the heating of the layered magnetic element, it may be heated alone or in a state where the metal foil is disposed on the layered magnetic element. In addition, you may heat a metal foil as needed.

[0029] When a layered magnetic element is obtained by extrusion, immediately after obtaining the layered magnetic element by extrusion, when the layered magnetic element is still at a relatively high temperature, the metal foil is thermocompression bonded, and thus immediately after extrusion. Further, it is preferable that the metal foil is thermocompression bonded. In this case, it is particularly preferred because it is efficient to carry out extrusion and hot pressing as a continuous process. In this case, the layered magnetic element, in particular its surface, may be heated if necessary. For this purpose, for example, a heating roller may be used.

[0030] It should be noted that the metal foil to be used has sufficient coupling with the layered magnetic element in which the surface in contact with the layered magnetic element preferably has a nodular (or nodule) or knob-like projection is preferred. Strength can be secured. As such a metal foil, a metal foil that is provided with irregularities on its surface by depositing a bump-like metal protrusion by electrodeposition, that is, a so-called electrolytic metal foil (for example, an electrolytic copper foil) is used. Is preferred. In this case, it is preferable to arrange the metal foil so that the uneven surface is in contact with the layered magnetic element. When such a concavo-convex surface is used, the adhesion between the metal foil and the layered magnetic element is improved by the anchor effect of the knob.

[0031] In the method for manufacturing an antenna element of the present invention, when a metal foil is attached and an antenna wiring pattern is formed by etching, the metal foil has an area sufficient to form a plurality of antenna wirings. Therefore, multiple antenna wiring is formed by etching The In this case, after the etching, the individual antenna elements can be obtained by dividing into layered magnetic elements having individual antenna wirings.

[0032] As described above, the antenna element of the present invention includes necessary electronic components in addition to the antenna wiring.

Such an electronic component having an antenna (for example, an IC chip, a capacitor, etc.) and other wiring for connecting the antenna wiring in a predetermined manner may be provided. Such wiring is preferably formed at the same time as the etching for forming the antenna wiring, if necessary.

[0033] The mounting of the electronic component is preferably performed after the antenna wiring and other necessary wiring are formed by etching. When a plurality of antenna wirings are formed by etching, it is preferable to implement mounting before dividing into individual antenna elements.

[0034] In the above description with reference to the drawings, the force in which the antenna wiring is present on one surface of the layered magnetic element In another aspect of the antenna element of the present invention, the antenna wiring is provided on the surfaces on both sides of the layered magnetic element. Have. As can be understood from the above description of the method for manufacturing an antenna element, this antenna element can be formed by directly attaching a metal foil to both sides of a layered magnetic element and then etching the metal foil.

[0035] When the metal foil is attached to one surface of the layered magnetic element, it is preferable to use thermocompression bonding. At this time, both the layered magnetic element and the metal foil are heated and then cooled. It will be. Because of their different coefficients of thermal expansion (especially linear expansion), in the cooled state, the composite of the thermocompression-bonded layered magnetic element and metal foil is caused by the difference in coefficient of expansion, even though it is apparently flat. It is in a state including internal stress. Then, if a part of the metal foil is removed by etching, the internal stress becomes obvious, which may cause warpage.

[0036] However, when the metal foil is attached to both sides of the layered magnetic element as in another embodiment, the metal foil exists on both sides of the layered magnetic element even if there is a difference in expansion coefficient. Are substantially canceled out on both sides, and the layered magnetic element having the metal foil on both surfaces is excellent in flatness as compared with the case of having the metal layer only on one side. Even after the metal foil is processed into the antenna wiring by etching, the presence of the antenna wiring on both sides can have an effect of canceling out the internal stress, so that the flatness is excellent. In this sense, the antenna element of the present invention has antenna wiring on both sides of the layered magnetic element. It is preferable to do this. In this case, it is preferable that the antenna wiring is formed so as to be substantially opposed via the layered magnetic element, that is, the other antenna wiring exists via the layered magnetic element on one antenna wiring. For example, it is preferred that one antenna wiring preferably overlaps at least partially, preferably substantially just overlaps the other wiring layer.

[0037] When antenna wiring exists on both sides, a through-hole is provided in the layered magnetic element at the end of one antenna wiring, and a conductive element (conductive resin, resin solder, etc.) is embedded in the hole. Alternatively, a conductive metal plating layer may be formed inside the through hole to ensure electrical connection of the antenna wiring between both surfaces of the layered magnetic element.

[0038] It should be noted that the presence of antenna wiring on both sides of the layered magnetic element makes it possible to make the absolute length of the antenna wiring longer when using layered magnetic elements of the same size. This means that the size of the antenna element can be further reduced. Since the absolute length becomes longer, it becomes possible to secure more allowance for inductance / capacitance adjustment, and the design flexibility of the antenna wiring is improved, so that the antenna wiring can be formed on one side of the layered magnetic element. Rather than the geometrical constraints imposed on antenna wiring formation.

Example

[0039] Manufacture of layered magnetic elements

The following magnetic and polymer materials were used:

• Magnetic materials

Finemet (registered trademark) FP—FT—5M (manufactured by Hitachi Metals, flat magnetic filler, average particle size: 30—41 m, apparent density: 0.5 · 0.7 g / cm ³ , tap density: 1. 0—1.4 gZ cm

'Polymer material

Diasolac (registered trademark) C-130 (chlorinated polyethylene, manufactured by Daiso Corporation, true density: 1. l lg / cm)

[0040] These magnetic materials and polymer materials are weighed with an electronic balance so that the proportions shown in Table 1 below are obtained, and mixed in a sample container for 1 minute with a plastic spatula. A powder was obtained.

[0041] Table 1

[0042] Thereafter, 45 cc of the mixed powder was charged into a powder kneader (Toyo Seiki Seisakusho, Labo Plast Mill: Model 50C150, Blade R60B), set temperature: 100 ° C, blade rotation speed: 60 rotations (per minute) And kneading for 15 minutes to obtain a kneaded mass.

[0043] The kneaded mass obtained as described above was made into a sandwich structure of iron plate / Teflon sheet / thickness adjusting spacer (made of SUS, thickness 0.5 mm) + kneaded mass / Teflon sheet / iron plate, Machine (Toho Press Mfg. Co., Ltd., hydraulic molding machine: Model T1), pre-pressed for 3 minutes at a preset temperature of 100 ° C and a preset pressure of IMPa for 4 minutes at 15 MPa. . Then, using a cooling press machine (Toho Press Mfg. Co., Ltd., hydraulic molding machine: Model T1) with water circulating at a set temperature of 22 ° C in a chiller, it was cooled and pressed at IMPa for 4 minutes, and 12cmxl2cm magnetic Sheets (thickness: 0.4-0. 6 mm) were obtained as layered magnetic elements.

[0044] Evaluation of magnetic properties of layered magnetic elements

A test sample (15 mm × 5 mm) was cut out from the layered magnetic element obtained as described above, and its permeability and saturation magnetic flux density were measured using the following apparatus:

Permeability measurement: PMF-3000 (manufactured by Ryowa Denshi Co., Ltd.)

Saturation magnetic flux density measurement: Vibration sample type magnetometer (VSM) BHV-50H (manufactured by Riken Denshi Co., Ltd.)

The measurement results of permeability (unit: H / m) and saturation magnetic flux density (unit: G) in the 14MHz band of the test sample are shown in Table 2 below.

[0045] ¾ 2

Example 1 Example 2

Permeability (@ 14 MHz) 3〇 7 0 4 3. 0 0

Saturation magnetic flux density (G) 2 9 8 6 2 6 7 4 Next, an electrolytic copper foil (Fukuda metal foil powder) on one side of the magnetic sheet of Example 1 and Example 2 treated on one side with a roughening treatment and a nickel-based compound using a thermal pressure press. CF-T8GD-STD-35, 35 m thick) was manufactured by thermocompression bonding.

[0047] As a pressing condition, a sandwich structure of iron plate / silicone rubber / Teflon sheet / thickness adjusting spacer (made of SUS, thickness 0.5 mm) + magnetic sheet + electrolytic copper foil / Teflon sheet / silicone rubber / iron plate Then, it was pressed at 120 ° C., 4 MPa, for 4 minutes with a thermal pressure press (manufactured by Toho Press Mfg. Co., Ltd., hydraulic molding machine: model T1). The nodule surface (rough surface with irregularities) of the electrolytic copper foil was adjacent to the magnetic sheet.

[0048] After that, using a cooling press machine (Toho Press's hydraulic molding machine model T-1) in which water at a set temperature of 22 ° C was circulated with a chiller, a cooling press was performed at IMPa for 4 minutes, A magnetic sheet with copper foil of lOcm × 10 cm was prepared.

[0049] With respect to the magnetic sheet with copper foil obtained as described above, the magnetic permeability and saturation magnetic flux density were measured for the test sample in the same manner as described above. The measurement results are shown in Table 3 below.

[0050] Table 3

[0051] As is apparent from the comparison of the measurement results in Table 2 and Table 3, it can be seen that both the magnetic permeability and the saturation magnetic flux density are improved by attaching the copper foil.

[0052] Each magnetic sheet with copper foil obtained as described above was etched to form a spiral antenna pattern as shown in Fig. 1 on the magnetic sheet to obtain the antenna element of the present invention. Then, using LCR METER 4263A (manufactured by HEWLETT PACKARD), measurement probes were arranged at both ends of the antenna, and the inductance L and Q values were measured at a frequency of 10 kHz. The results are shown in Table 4 below.

[0053] Table 4

Example 1 Example 2

L 8 6. 3 H 1 4. 9 H

Q 8. 7 4. 9 [0054] From the measurement results in Table 4, it can be seen that the antenna element of the present invention having a spiral antenna pattern exhibits sufficient inductance L and Q values, and thus functions as an antenna element.

Industrial applicability

[0055] The present invention provides an antenna element that can be more easily manufactured, and also provides a method for manufacturing such an antenna element.

Claims

The scope of the claims

[1] (A) a layered magnetic element formed from a magnetic composition comprising a magnetic material and a polymer material, and

(B) An antenna element having an antenna wiring disposed on at least one surface of a layered magnetic element.

[2] The antenna element according to claim 1, wherein the antenna wiring protrudes from the surface of the layered magnetic element.

[3] The antenna element according to claim 1 or 2, wherein the magnetic material is at least one selected from the group consisting of an iron-cadium alloy, a ferrite, an iron-nickel alloy, a sendust alloy, and an amorphous alloy. .

[4] The polymer materials are polyethylene, polypropylene, chlorinated polyethylene, polyvinylidene chloride, polyvinylidene fluoride, polystyrene, polyoxymethylene, ethylene-vinylinoleate copolymer, ethylene-butynoleate copolymer, polyethylene terephthalate.

The antenna element according to any one of claims 1 to 3, which is at least one selected from nylon, acrylonitrile butadiene styrene terpolymer, and polyphenylene sulfide.

[5] The antenna element according to any one of [1] to [4], wherein the antenna wiring is formed of an electrolytic metal foil having an uneven surface in contact with the layered magnetic element.

6. The antenna element according to any one of claims 1 to 5, wherein the antenna wiring is disposed on the surface of the layered magnetic element by thermocompression bonding.

7. The antenna element according to any one of claims 1 to 6, wherein the magnetic composition comprises 60 to 95 parts by mass of a magnetic material and 40 to 5 parts by mass of a polymer material.

[8] The method according to claim 1, further comprising an IC chip connected to the antenna wiring.

7! / The antenna element described in the deviation.

[9] A method for manufacturing an antenna element having a layered magnetic element and an antenna wiring disposed thereon,

(1) obtaining a layered magnetic element from a magnetic composition comprising a magnetic material and a polymer material; (2) directly attaching a metal foil on at least one surface of the layered magnetic element; and

(3) A method of manufacturing an antenna element, comprising: forming an antenna wiring having a predetermined pattern by etching a metal foil.

[10] Immediately after obtaining the layered magnetic element by extrusion, the process is performed by thermocompression bonding the metal foil.

10. The method for manufacturing an antenna element according to claim 9, wherein (1) and step (2) are continuously performed.

[11] The method for manufacturing an antenna element according to [9] or [10], wherein the step (2) is performed by placing a metal foil on the extrudate and then thermocompression bonding.

[12] The method for manufacturing an antenna element according to any one of [9] to [11], wherein a plurality of antenna wirings are formed in the step (3).

[13] After step (3), a predetermined IC chip corresponding to each antenna wiring is placed on the layered magnetic element, and each IC chip and each antenna wiring are electrically connected in a predetermined manner. 13. The method for manufacturing an antenna element according to claim 9, wherein an IC chip is mounted.

14. The method according to claim 9, further comprising a step of dividing the antenna elements into individual antenna elements having a single antenna wiring after mounting when a plurality of antenna wirings are formed. A method for manufacturing the antenna element according to claim 1.

15. An RFID system IC tag comprising the antenna element according to any one of claims 1 to 8.

[16] A reader / writer for an RFID system, comprising the antenna element according to any one of claims 1 to 8.

17. A portable electronic device comprising the antenna element according to any one of claims 1 to 8.