JP2007019891A - Magnetic antenna - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a magnetic antenna which operates stably even if attached to a metallic surface, and has high mass productivity. <P>SOLUTION: The magnetic antenna can be obtained whose magnitude of a resonant frequency change is small even if attached to the metallic surface by forming, via an insulating layer, a structure formed with a conductive layer in a magnetic layer for forming a coil, and operative quality is stable and homogenous by not contacting directly with the metallic surface when attached thereto. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a magnetic antenna using a magnetic field component for the purpose of communication, and is a magnetic antenna that can transmit and receive signals with high sensitivity even if an object to which the antenna is attached is a metal.

  An antenna that transmits and receives electromagnetic waves using a magnetic material (hereinafter referred to as a magnetic material antenna) is a coil formed by winding a conductive wire around a magnetic material, and a magnetic field component flying from the outside is caused to penetrate the magnetic material and be induced in the coil. An antenna that converts voltage (or current) and has been widely used for small radios and TVs. Further, it is used in a non-contact type object identification device called an RFID tag that has been widely used in recent years.

When the frequency is higher, a magnetic substance is not used, and in the RFID tag, a loop coil whose plane is parallel to the object to be identified is used as an antenna, and when the frequency (UHF band or microwave band) is further increased, the RFID tag Electric field antennas (dipole antennas and dielectric antennas) that detect electric field components are widely used rather than detecting magnetic field components including tags.

Such a loop antenna or electric field antenna has a problem that when a metal object approaches, an image (mirror effect) is formed on the metal object and has an opposite phase to the antenna, so that the sensitivity of the antenna is lost.

In order to avoid this drawback, an antenna has been developed in which a rectangular or rectangular coil is directly attached to a metal object so that the coil surface is perpendicular to the metal surface (Patent Document 1).

JP 2003-317052 A

  However, this type of magnetic antenna has a drawback that when the wound coil comes into contact with a metal object, the contact surface between the winding and the metal plate becomes unstable, resulting in variations.

  Moreover, when using for an RFID tag, it is necessary to affix on a metal plate and to adjust a frequency one by one. Furthermore, there is a problem that the wound antenna lacks mass productivity. Further, when the magnetic antenna approaches a metal object, the characteristics of the magnetic antenna change and the resonance frequency changes.

  Therefore, the present invention prevents the characteristics of the antenna from varying when the coil wound around the magnetic antenna comes into contact with a metal object and the contact between the winding and the metal plate becomes unstable. Let it be an issue. At the same time, when the magnetic antenna approaches a metal object, it is an object to prevent the characteristic from changing and the resonance frequency from changing.

  The technical problem can be achieved by the present invention as follows.

In order to solve these problems, the present invention provides a magnetic antenna having a high mass-productivity structure in which a conductive layer is laminated via an insulating layer on a coil wound around a magnetic layer.

As shown in FIG. 1, the magnetic antenna according to the present invention has a through-hole 1 formed in a magnetic layer 5 in which a magnetic powder is mixed with a binder to form a sheet or a plurality of layers, and an electrode is formed in the through-hole 1. The electrode layer 2 is formed of electrode material on both sides perpendicular to the through hole 1 by pouring the material, and this is connected to the through hole 1 so that the magnetic layer 5 forms a rectangular or rectangular coil to form the coil 4 As shown in FIG. 2, the upper and lower surfaces of the coil 4 on which the electrode layer is printed are sandwiched between the insulating layers 6 and the conductive layer 7 is provided on the upper surface of one or both of the insulating layers. The magnetic antenna is characterized in that it is a mass-produced magnetic antenna using the LTCC technique in which the through-hole 1 and the coil open end face 3 are cut and integrally fired.

Further, in the magnetic antenna of the present invention, as shown in FIG. 3, through holes 1 are provided in the insulating layers 6 on the upper and lower surfaces of the coil 4 on which the electrode layers are printed, and an electrode material is poured into the through holes 1 to The coil lead terminal 9 and the IC chip connection terminal 8 are printed on the surface of the coil lead electrode 9 and the IC chip connection terminal 8 by an electrode material, and are integrally fired.

The magnetic antenna according to the present invention is characterized in that the magnetic layer 5 is provided on the lower surface of the insulating layer 6 having the conductive layer 7 as shown in FIG. As a result, even when a metal object approaches the magnetic antenna, the change in characteristics of the magnetic antenna becomes smaller, and the change in resonance frequency can be made smaller.

In addition, the magnetic antenna of the present invention is characterized in that, as shown in FIG. 5, the conductive layer 7 is provided on the upper surface of the insulating layer 6 and the magnetic layer 5 is provided on the lower surface thereof, and the insulating layer 6 is provided on the lower surface thereof. Is. This balances the stress generated between the layers of the magnetic antenna and reduces the warpage.

Further, in the magnetic antenna of the present invention, the capacitor electrode 11 is disposed on one or both outer surfaces of the insulating layer 6 sandwiching the upper and lower surfaces of the coil 4 as shown in FIG. 6, and the capacitor electrode 11 is disposed on the outer surface. Further, an insulating layer 6 is provided, an electrode is printed on the outer surface of the insulating layer 6, a capacitor is formed so as to sandwich the insulating layer, and the IC chip connection terminal 8 and the coil lead terminal are connected in parallel or in series. It is a feature.

The magnetic antenna according to the present invention is characterized in that a parallel electrode or a comb electrode is printed on the upper surface of the insulating layer to form a capacitor and connected in parallel or in series with the coil lead terminal. The capacitor may be a parallel plate structure sandwiching the insulating layer 6 or may be a comb-shaped or parallel electrode planar structure. In the parallel plate structure, one capacitor electrode may also serve as the IC chip connection terminal 8 as shown in FIG.

The magnetic antenna of the present invention is characterized in that the magnetic layer 5 is integrally fired using a Ni—Zn ferrite magnetic material. The ferrite powder used is Fe ₂ O ₃ 45-49.5 mol%, NiO 9.0-45.0 mol%, ZnO 0.5-35.0 mol%, CuO 4.5-15.0 mol% The ferrite composition is preferably selected so that the magnetic permeability is high and the magnetic loss is low in the frequency band to be used. If the magnetic permeability is too low, the number of coil turns necessary to form with the LTCC technique becomes too large, making manufacture difficult. If the magnetic permeability is too high, the loss increases, making it unsuitable for an antenna. For example, a ferrite composition may be selected such that the permeability at 13.56 MHz is 70 to 120 for RFID tags and 10 to 30 at 100 MHz for consumer FM broadcast reception. The sintering temperature of ferrite is 800 to 1000 ° C, preferably 850 to 920 ° C.

The magnetic antenna of the present invention is characterized in that the insulating layer 6 is integrally fired using Zn-based ferrite. For the ferrite powder to be used, a Zn-based ferrite composition is preferably selected such that the volume resistivity of the sintered body is 10 ⁸ Ωcm or more. Fe ₂ O ₃ from 45 to 49.5 mol%, ZnO 17.0 to 22.0 mol%, the composition is CuO 4.5-15.0 mol% are preferred.

The magnetic antenna of the present invention is characterized in that the insulating layer 6 is integrally fired using glass-based ceramic. Borosilicate glass, zinc glass, lead glass, or the like can be used as the glass ceramic.

Further, the magnetic antenna of the present invention has a terminal structure in which an IC chip can be connected to the upper surface of the insulating layer 6 as shown in FIG. 3, and is connected to the IC chip connection terminal 8 in parallel or in series and fired integrally. To do.

The magnetic antenna according to the present invention is characterized in that a terminal provided with a variable capacitor on the upper surface of an insulating layer is connected in parallel or in series with a coil lead terminal.

  Moreover, Ag paste is suitable for the electrode material of the magnetic antenna of the present invention, and metal conductive paste such as other Ag alloy paste can be used.

According to the magnetic antenna of the present invention, the conductive layer is LTCC (Low
Since it is formed by the technology (Temperature Co-fired Ceramics, low-temperature co-fired ceramics), the adhesion of the laminated layers is good, and the winding and the added metal layer can be stably bonded. In addition, since a plurality of elements can be stably manufactured from a single sheet, variations in each element can be suppressed, and the frequency can be adjusted independently by the element, so there is no need to adjust under the use environment. Moreover, since the metal layer is added even if the magnetic antenna approaches the metal object, the disadvantage that the characteristics fluctuate can be solved.

  The magnetic antenna considering the metal of the present invention has a small change in the resonance frequency before and after the metal surface is pasted to 1 MHz or less, and in the RFID application of 13.56 MHz, a communication distance of 3 cm or more can be obtained even when pasted on the metal surface. Moreover, by making the laminated structure of the green sheets symmetrical in the direction parallel to the surface from the center, it is possible to suppress warping after firing to 0.5 mm or less per 1 cm long side of the fired product. A simple antenna can be manufactured.

Hereinafter, the present invention will be described in detail based on embodiments of the invention with reference to the accompanying drawings.

[Example 1]
For magnetic layer 5, Ni—Zn—Cu ferrite calcined powder having a permeability of 100 at 13.56 MHz after sintering at 900 ° C. (Fe ₂ O ₃ 48.5 mol%, NiO 25 mol%, ZnO 16 mol) %, CuO 10.5 mol%) 100 parts by weight, butyral resin 8 parts by weight, plasticizer 5 parts by weight, and solvent 80 parts by weight were mixed in a ball mill to produce a slurry. The resulting slurry was formed into a sheet by a doctor blade on a PET film so as to have a 150 mm square and a thickness of 0.1 mm upon sintering. Also similarly as insulating layer 6, Zn-Cu ferrite calcined powder _{(Fe 2} O 3 48.5 mol%, ZnO 41 mol%, CuO 10.5 mol%), 8 parts by weight of a butyral resin, a plasticizer A slurry was prepared by mixing 5 parts by weight of the agent and 80 parts by weight of the solvent with a ball mill. The resulting slurry was formed into a sheet with the same size and thickness as the magnetic layer on a PET film with a doctor blade. Next, as shown in FIG. 1, a through-hole 1 is formed in the green sheet for the magnetic layer 5 and filled with Ag paste, and the Ag paste is printed on both sides perpendicular to the through-hole 1 to laminate five sheets. Then, the coil 4 was formed. Next, as shown in FIG. 2, the green sheet for the insulating layer 6 was laminated on the upper and lower surfaces of the coil, and the green sheet for the insulating layer 6 on which the conductive layer 7 was printed with Ag paste was laminated on one surface. The above green sheets are pressure-bonded together, cut at the through hole and the coil open end face 3, and integrally fired at 900 ° C. for 2 hours to obtain a magnetic material having a coil winding number of 32 turns of 18 mm wide × 4 mm long. Antenna sample 1 was prepared. The above is the process of the magnetic antenna using the LTCC technology. (In FIGS. 1 and 2, the number of coil turns is indicated by 7 turns for the sake of simplification, and the number of magnetic layers is indicated by 3 layers for simplification of the figure. The same applies to the figure in FIG.)

An RFID tag IC is connected to both ends of the coil of the magnetic antenna, a capacitor is connected in parallel with the IC, and the resonance frequency is adjusted to 13.1 MHz to create an RFID tag, which is attached to a metal plate and output 10 mW The distance to communicate with the reader / writer was measured. Moreover, the curvature of the magnetic antenna was measured. Each measurement method is summarized below.

[Measurement and adjustment of resonance frequency]
The resonance frequency was determined by connecting a one-turn coil to an impedance analyzer 4291A manufactured by Hewlett-Packard Co., and combining it with an RFID tag, and using the peak frequency of the impedance measured as the resonance frequency. The adjustment was performed by adjusting the inductance by selecting the position of the coil electrode exposed on the end face of the magnetic antenna. The resonance frequency can be adjusted by changing the capacitance of the capacitor connected in parallel with the IC.

[Measurement method of communication distance]
As for the communication distance, an antenna of a 10 mW output reader / writer (manufactured by FC Corporation, product name URWI-201) is horizontally fixed, and an RFID tag affixed to a metal plate is positioned horizontally above the antenna. The distance in the vertical direction between the antenna and the RFID tag at the highest possible position for communication at 56 MHz was defined as the communication distance.

[Measurement of warpage]
Attach a dial gauge (Mitutoyo Dial Gauge ID-C112) with a flat gauge to the stand (Mitutoyo Stand BSG-20), adjust the dial gauge to 0 on the surface plate, and place the magnetic antenna on the surface plate and plate The highest point is measured with a dial gauge by being sandwiched between the measuring elements, and the value of the warp is calculated by subtracting the thickness of the magnetic antenna measured with a caliper (Mitotogigi CD-C) from the height.

As a result, the curvature of the magnetic antenna was 0.6 mm, which was within the practical range. The RFID tag using the magnetic antenna had a small fluctuation of the resonance frequency before and after the metal plate was attached to +1 MHz, and a communication distance of 3 cm was obtained when the RFID tag was attached to the metal surface.

[Example 2]
The green sheet for the magnetic layer 5 described in Example 1 and the green sheet for the insulating layer 6 using glass ceramic instead of Zn—Cu ferrite are used. As shown in FIG. 3, a through hole 1 is opened in the green sheet for the magnetic layer 5, and the Ag paste is filled therein, and the Ag paste is printed on both sides perpendicular to the through hole 1, and five sheets are laminated. A coil 4 was formed. Next, a green sheet for the insulating layer 6 formed by printing the conductive layer 7 with Ag paste on one surface of the coil 4 was laminated. On the other side, a through hole is formed so as to connect to both ends of the coil, and an Ag paste is filled therein, and an IC chip connection terminal for connecting the coil lead terminal 9 and the IC to the surface layer perpendicular to the through hole 1 The shape to be 8 was printed with Ag paste and laminated. The above green sheets are pressure-bonded together, cut at the through-hole 1 and the coil open end face 3, and integrally fired at 900 ° C. for 2 hours to obtain a magnetic body having a coil winding number of 32 turns of 18 mm wide × 4 mm long. Antenna sample 2 was created. The warp of the magnetic antenna was 1.0 mm and was in a practical range.

An RFID tag IC is connected to both ends of the coil of the magnetic antenna, a capacitor is connected in parallel with the IC, and the resonance frequency is adjusted to 13.1 MHz to create an RFID tag, which is attached to a metal plate and output 10 mW The distance and resonance frequency with which the reader / writer communicates were measured.

As a result, the RFID tag had a communication distance of 3.1 cm when the metal plate was attached. The resonance frequency when the metal plate was attached was 14.1 MHz, and the fluctuation of the resonance frequency was +1 MHz.

[Example 3]
The green sheet for magnetic layer 5 and the green sheet for insulating layer 6 described in Example 1 are used. As shown in FIG. 4, the through hole 1 is opened in the green sheet for the magnetic layer 5, the Ag paste is filled therein, and the Ag paste is printed on both sides perpendicular to the through hole 1 to laminate five sheets, A coil 4 was formed. Next, the insulating layer 6 green sheet and the insulating layer 6 green sheet formed by printing the conductive layer 7 with Ag paste were laminated on the lower surface of the coil 4, and the magnetic layer 5 green sheet was laminated on the lower surface thereof. On the upper surface, through-holes 1 are formed so as to be connected to both ends of the coil, Ag paste is filled therein, and coil lead terminals 9 and IC chip connection terminals 8 for connecting the IC to the surface layer perpendicular to the through-holes 1 are provided. The resulting shape was printed with Ag paste and laminated. The above green sheets were pressure-bonded together, cut at the through hole 1 and the coil open end face 3, and integrally fired to produce a magnetic antenna sample 3 having a coil winding number of 32 turns with a size of 18 mm wide × 4 mm long. . The warp of the magnetic antenna was 0.8 mm, which was a practical range. An RFID tag IC is connected to the IC chip connection terminal 8 of the magnetic antenna, a capacitor is connected in parallel with the IC, the resonance frequency is adjusted to 13.1 MHz, and an RFID tag is created and attached to a metal plate. Then, the communication distance was measured with a reader / writer with an output of 10 mW.

As a result, the RFID tag had a smaller fluctuation of the resonance frequency before and after the metal plate was affixed to +0.5 MHz, and a communication distance of 3.3 cm was obtained when the metal plate was affixed.

[Example 4]
The green sheet for magnetic layer 5 and the green sheet for insulating layer 6 described in Example 1 are used. As shown in FIG. 5, a through hole 1 is opened in the green sheet for the magnetic layer 5, and an Ag paste is filled therein, and the Ag paste is printed on both sides perpendicular to the through hole 1, and five sheets are laminated. A coil 4 was formed. Next, the insulating layer 6 green sheet and the insulating layer 6 green sheet formed by printing the conductive layer 7 with Ag paste are laminated on the lower surface of the coil 4, and the magnetic layer 5 green sheet is further laminated on the lower surface thereof. A green sheet for the insulating layer 6 was laminated on the lower surface. An through-hole 1 is formed on the upper surface so as to be connected to one end of the coil 4, and an Ag paste is filled therein, and an IC chip connection terminal 8 for connecting the coil lead terminal 9 and the IC to the surface layer perpendicular to the through-hole 1. The shape which becomes one of these was printed on the green sheet for insulating layers 6 with Ag paste. Further, the through hole 1 is opened so as to be connected to the other end of the coil 4 and some intermediate points, and the Ag paste is filled therein, and the coil lead terminal 9 is drawn out to the surface layer perpendicular to the through hole 1, and the coil lead terminal The shape which becomes one of the IC chip connection terminal 8 which connects the coil lead terminal 9 and IC in the shape which faces the end surface of 9 was printed on the green sheet for insulating layers 6 with Ag paste, and was laminated. The above green sheets are pressure-bonded together, cut at the through-hole 1 and the open end face of the coil, and integrally fired at 900 ° C. for 2 hours. Sample 4 was created. The warp of the magnetic antenna was as small as 0.1 mm.

An RFID tag IC is connected to the IC chip connection terminal 8 of the magnetic antenna, and the end faces of the coil lead terminals 9 facing the surface layer are short-circuited with a conductive paint to adjust the inductance. An RFID tag was prepared by adjusting the resonance frequency to 13.1 MHz, and the RFID tag was attached to a metal plate, and the communication distance with a reader / writer with an output of 10 mW was measured.

As a result, the RFID tag showed a communication distance of 3.4 cm when the metal plate was attached. The change in resonance frequency before and after the metal plate was attached was as small as +0.5 MHz.

[Example 5]
The green sheet for magnetic layer 5 and the green sheet for insulating layer 6 described in Example 1 are used. As shown in FIG. 6, a through hole 1 is formed in the green sheet for the magnetic layer 5, and an Ag paste is filled therein, and the Ag paste is printed on both sides perpendicular to the through hole 1 to laminate five sheets, A coil 4 was formed. Next, the insulating layer 6 green sheet and the insulating layer 6 green sheet formed by printing the conductive layer 7 with Ag paste are laminated on the lower surface of the coil 4, and the magnetic layer 5 green sheet is further laminated on the lower surface thereof. A green sheet for an insulating layer was laminated on the lower surface. The through-hole 1 is formed in the green sheet for the insulating layer 6 on the upper surface of the coil 4 so as to be connected to both ends of the coil 4, the Ag paste is filled therein, and the Ag paste is formed on the surface perpendicular to the through-hole 1. Then, the capacitor electrode 11 was printed, and a capacitor was formed between the IC chip connection terminal 8 on the green sheet for the insulating layer 6 laminated thereon. The above green sheets are pressure-bonded together, cut at the through-hole 1 and the open end face of the coil, and integrally fired at 900 ° C. for 2 hours. Sample 5 was created. The warp of the magnetic antenna was as small as 0.1 mm.

An RFID tag IC is connected to the IC chip connection terminal 8 of the magnetic antenna, and a part of the IC chip connection terminal 8 is scraped off to adjust the capacitance to adjust the resonance frequency to 13.1 MHz. A tag was created and affixed to a metal plate, and the distance to communicate with a reader / writer with an output of 10 mW was measured.

As a result, the RFID tag showed a communication distance of 3.3 cm when the metal plate was attached. The change in resonance frequency before and after the metal plate was attached was as small as +0.5 MHz.

[Example 6]
For magnetic layer 5, Ni-Zn-Cu ferrite calcined powder having a magnetic permeability of 20 at 100 MHz after sintering at 900 ° C. (Fe ₂ O ₃ 48.5 mol%, NiO 39 mol%, ZnO 2 mol%, A slurry was prepared by mixing 100 parts by weight of CuO (10.5 mol%), 7 parts by weight of butyral resin, 3 parts by weight of a plasticizer, and 100 parts by weight of a solvent with a ball mill. The resulting slurry was formed into a sheet on a PET film with a doctor blade. Also similarly as insulating layer 6, Zn-Cu ferrite calcined powder _{(Fe 2} O 3 48.5 mol%, ZnO 40 mol%, CuO 11.5 mol%) 100 parts by weight of a butyral resin 7 parts by weight, plasticizer 3 parts by weight of the agent and 100 parts by weight of the solvent were mixed with a ball mill to produce a slurry. The resulting slurry was formed into a sheet on a PET film with a doctor blade. Next, as shown in FIG. 7, a through-hole 1 is formed in the green sheet for the magnetic layer 5 and filled with Ag paste, and the Ag paste is printed on both sides perpendicular to the through-hole 1 to laminate five sheets. Then, the coil 4 was formed. Next, a green sheet for the insulating layer 6 was laminated on the upper and lower surfaces of the coil 4, and an insulating layer 6 on which the conductive layer 7 was printed with Ag paste was further laminated on the lower surface side. The above green sheets are pressure-bonded together, cut at the through-hole 1 and the coil open end face 3, and integrally fired at 900 ° C. for 2 hours, and a magnetic antenna having a coil winding number of 50 turns having a size of 18 mm wide × 4 mm long. Sample 6 was created. The warp of the magnetic antenna was as small as 0.6 mm.

An FM radio 10 is connected to both ends of the coil of the magnetic antenna, a capacitor is connected in parallel with the coil 4, and the resonance frequency is adjusted to 82 MHz to create an FM broadcast receiving antenna. Assuming that an antenna is installed outside the antenna, it was affixed to a metal plate and tried to receive FM broadcast (82 MHz), and a good reception state was obtained.

[Comparative Example 1]
For the same process as the magnetic antenna sample 1 described in Example 1, a magnetic antenna sample 7 not forming the conductive layer 7 as shown in FIG. The warp of the magnetic antenna was 0.1 mm.

An RFID tag IC is connected to both ends of the coil of the magnetic antenna, a capacitor is connected in parallel with the IC, and the resonance frequency is adjusted to 13.1 MHz to create an RFID tag, which is attached to a metal plate and output 10 mW The distance to communicate with the reader / writer was measured.
As a result, the RFID tag had a large change in the resonance frequency before and after the metal plate was attached, and was +1.5 MHz. When the metal plate was attached, only a communication distance of 1.4 cm was obtained.

[Comparative Example 2]
For comparison, a general commercially available IC card type tag (product name: Tag-it ^TM HF manufactured by Texas Instruments Co., Ltd.) in which an IC is connected to both ends of an antenna coil that is spirally wired on a film-like resin surface, The distance of communication with a reader / writer with an output of 10 mW was measured after being attached to a metal plate.
As a result, the communication distance when the metal plate was stuck was 0.1 cm, and the resonance frequency after the metal plate was stuck was not observed.

It is a lamination | stacking block diagram of the coil part of the magnetic body antenna of this invention. It is a perspective view of the laminated magnetic body antenna in Example 1 of this invention. It is a perspective view of the laminated magnetic antenna in Example 2 of this invention. It is a perspective view of the laminated magnetic antenna in Example 3 of this invention. It is a perspective view of the laminated magnetic antenna in Example 4 of this invention. It is a perspective view of the laminated magnetic antenna in Example 5 of this invention. It is a perspective view of the laminated magnetic antenna in Example 6 of this invention. It is a perspective view of the laminated magnetic antenna which does not comprise the conductive layer in Comparative Example 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Through hole 2 Electrode layer 3 Coil open end surface 4 Coil 5 Magnetic layer 6 Insulating layer 7 Conductive layer 8 IC chip connection terminal 9 Coil lead terminal 10 FM radio 11 Capacitor electrode

Claims (15)

A magnetic antenna for transmitting and receiving magnetic field components, wherein one or both outer surfaces of the magnetic layer are formed such that the electrode material is coiled around the magnetic layer, and the coiled electrode material is formed. An insulating layer is formed on the magnetic antenna, and a conductive layer is provided on the outer surface of one or both insulating layers. A magnetic antenna for transmitting and receiving magnetic field components, wherein a single layer magnetic layer formed by mixing a mixture of magnetic powder and binder resin into a sheet or a magnetic layer in which a plurality of layers are laminated, with the magnetic layer as the center The electrode material is formed in a coil shape as an electric circuit, the insulating layer is formed on both outer surfaces on which the coiled electrode material is formed, the conductive layer is formed on the outer surface of one or both of the insulating layers, A magnetic antenna, which is integrally fired after being cut to a desired size. A magnetic antenna for transmitting and receiving magnetic field components. A through hole is formed in a magnetic layer in which magnetic powder is mixed with a binder to form a single layer or a plurality of layers, and an electrode material is formed in the through hole. An electrode layer is formed of electrode material on both sides that are poured and perpendicular to the through hole, and this is connected to the through hole to form a rectangular or rectangular coil, and both ends of the magnetic layer forming the coil are magnetic. In the configuration that is open on the circuit, the upper and lower surfaces of the coil printed with the electrode layer are sandwiched between insulating layers, a conductive layer is disposed on the outer surface of one or both insulating layers, cut at the through hole and the open end surface of the coil, and integrally fired. Magnetic antenna characterized by using LTCC technology. 4. The magnetic antenna according to claim 3, wherein a through hole is provided in one or both of the upper and lower surfaces of the coil on which the electrode layer is printed, an electrode material is poured into the through hole, and both ends of the coil are connected to the surface. A magnetic antenna characterized in that a coil lead terminal and an IC chip connection terminal are printed with an electrode material. 5. The magnetic antenna according to claim 3, wherein an insulating layer or a magnetic layer is further provided on the outer surface of the conductive layer formed on the outer surface of the insulating layer. 6. 6. The magnetic antenna according to claim 3, wherein an insulating layer is further provided on the outer surface of the conductive layer formed on the outer surface of the insulating layer, and a magnetic layer is further provided on the outer surface. A magnetic antenna. 6. The magnetic antenna according to claim 3, wherein a magnetic layer is further provided on the outer surface of the conductive layer formed on the outer surface of the insulating layer, and an insulating layer is further provided on the outer surface. A magnetic antenna. 7. The magnetic antenna according to claim 3, wherein an insulating layer is further provided on the outer surface of the conductive layer formed on the outer surface of the insulating layer, and a magnetic layer is further provided on the outer surface. A magnetic antenna characterized in that an insulating layer is provided on a side surface. The magnetic antenna according to any one of claims 3 to 8, wherein a capacitor electrode is disposed on one or both outer surfaces of the insulating layer sandwiching the upper and lower surfaces of the coil, and further on the outer surface on which the capacitor electrode is disposed. A magnetic antenna comprising an insulating layer, an electrode printed on an outer surface of the insulating layer, a capacitor formed so as to sandwich the insulating layer, and connected in parallel or in series with an IC chip connection terminal. 10. The magnetic antenna according to claim 3, wherein a capacitor is formed by printing parallel electrodes or comb-shaped electrodes on the surface of the insulating layer, and connected in parallel or in series with the coil lead terminal. A magnetic antenna characterized by the above. 11. The magnetic antenna according to claim 3, wherein Ni—Zn-based ferrite is used for the magnetic layer. 11. The magnetic antenna according to any one of claims 3 to 11, wherein a Zn-based ferrite is used for the insulating layer. The magnetic antenna according to any one of claims 3 to 12, wherein a glass-based ceramic is used for the insulating layer. 14. The magnetic antenna according to claim 3, wherein the magnetic antenna has a terminal structure to which an IC chip can be connected on the upper surface of the insulating layer, and is connected in parallel or in series with a coil lead terminal. antenna. The magnetic antenna according to any one of claims 3 to 14, wherein a terminal for providing a variable capacitor on an upper surface of the insulating layer is connected in parallel or in series with a coil lead terminal.