Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q1/00—Details of, or arrangements associated with, antennas
  • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
  • H01Q1/362—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith for broadside radiating helical antennas
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q1/00—Details of, or arrangements associated with, antennas
  • H01Q1/12—Supports; Mounting means
  • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
  • H01Q1/2283—Supports; Mounting means by structural association with other equipment or articles mounted in or on the surface of a semiconductor substrate as a chip-type antenna or integrated with other components into an IC package
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q1/00—Details of, or arrangements associated with, antennas
  • H01Q1/12—Supports; Mounting means
  • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
  • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
  • H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
  • H01Q7/08—Ferrite rod or like elongated core

Definitions

• the present invention relates to a magnetic antenna, and more specifically, a credible magnetic antenna that uses a magnetic field component, and transmits and receives signals with high sensitivity even when attached to a metal object.
• the present invention relates to a magnetic antenna that can be used.
• the magnetic antenna of the present invention is particularly suitable for RFID tags and RFID tag readers / writers. Background art
• An antenna that transmits and receives electromagnetic waves using a magnetic material (hereinafter referred to as "magnetic antenna”;) has a coil formed by winding a conducting wire around a magnetic material, and has a magnetic field component flying from the outside.
• Magnetic antennas are also used in non-contact type object identification devices called RFID tags, which have become popular in recent years.
• Patent Document 2 Japanese Patent Laid-Open No. 2003-317052
• Patent Document 2 Japanese Patent Laid-Open No. 2003-318634
• the antenna to be wound is not mass-productive.
• the conventional magnetic antenna has a problem that the characteristics of the magnetic antenna change as the metal object is approached, and the resonance frequency changes. In order to obtain resonance at a desired frequency, it is attached to a metal plate. In addition, it is necessary to adjust the frequency individually.
• the present invention has been made in view of the above circumstances, and an object thereof is a magnetic antenna suitable for an RFID tag and a reader / writer for an R FID tag, in which a coil is in contact with a metal object. Even in such a case, it is also possible to provide a magnetic antenna excellent in mass productivity because the characteristics of the antenna vary. Another object of the present invention is to provide a magnetic antenna in which the resonance frequency does not change even when approaching a metal object. Furthermore, another object of the present invention is to provide a magnetic antenna suitable for the RFID tag reader Z writer and capable of transmitting and receiving accurately with one pole of a coil.
• a coil is formed by arranging an electrode material on a magnetic layer in a coil shape, and a structure in which a conductive layer is laminated on the coil via an insulating layer is adopted.
• the present invention suitable for an RFID tag is composed of the following first to third aspects, and the first aspect is a magnetic antenna for transmitting and receiving a magnetic field component, A coil formed by arranging electrode materials in a coil shape on the outer periphery of the layer, an insulating layer provided on one or both outer surfaces of the coil, and a conductive layer provided on the outer surface of one or both insulating layers
• a magnetic antenna characterized by comprising:
• the second gist of the present invention is a magnetic antenna for transmitting and receiving a magnetic field component, which is a single layer or a plurality of layers formed by molding a mixture of magnetic powder and binder resin into a sheet shape.
• a coil is formed by arranging an electrode material on the outer periphery of the magnetic layer in the form of a coil as an electric circuit, and an insulating layer is provided on both outer surfaces of the coil, and the outer surface of one or both insulating layers
• a magnetic antenna is characterized in that a conductive layer is provided, and is cut into a desired size and then fired integrally.
• a third gist of the present invention is a magnetic antenna for transmitting and receiving a magnetic field component, in which a magnetic powder is mixed with a binder and the plane shape is formed into a square or rectangular sheet.
• a through-hole is formed in a magnetic layer having a layer structure or a multilayer structure, an electrode material is poured into the through-hole, and electrode layers are formed on both surfaces of the magnetic layer orthogonal to the through-hole with the electrode material.
• a coil having a configuration in which both ends of the magnetic layer are open on the magnetic circuit is created, and the upper and lower surfaces of the coil on which the electrode layer is formed are sandwiched between insulating layers, and one or both of the insulating layers are outside.
• a magnetic antenna is characterized in that a conductive layer is disposed on a side surface, cut at a position corresponding to a through hole and a coil open end surface, and integrally fired.
• the present invention suitable for the RFID tag reader Z writer has the following four aspects, the fourth aspect being a magnetic antenna for transmitting and receiving magnetic field components.
• the coil has a plurality of coils each having a square or rectangular magnetic layer, and these coils are arranged radially at almost equal intervals in plan view, and one end of each coil has its polarity. Are connected in series or in parallel with each other at the center of the radial shape, and the other end of each coil is opened toward the outside of the radial shape, and the upper and lower surfaces of the coil One or both of them are provided with an insulating layer, and a conductive layer is provided outside one of the insulating layers. To do.
• the fifth aspect of the present invention is a magnetic antenna for transmitting and receiving a magnetic field component, comprising a plurality of coils each having a square or rectangular magnetic layer as a planar shape.
• the coils are arranged radially at almost equal intervals in a plan view, and one end of each coil is opened toward the center of the radial shape, and the other end of each coil is outside the radial shape.
• the magnetic antenna is characterized in that a conductive layer is provided outside one of the insulating layers.
• a sixth aspect of the present invention is a magnetic antenna manufactured using LTCC technology for transmitting and receiving a magnetic field component, wherein magnetic powder is mixed with a binder and formed into a sheet shape.
• a through-hole is formed in a magnetic layer having a single layer or a multi-layer structure, an electrode material is poured into the through-hole, and electrode layers are formed on both sides of the magnetic layer perpendicular to the through-hole with an electrode material.
• Material The conductive layer is formed and cut into individual pieces and fired, or integrally fired and then cut into individual pieces, and the planar shape is composed of a square or rectangular magnetic layer.
• Several coils are arranged radially at substantially equal intervals in plan view, and one end of each coil is a magnetic layer in series or in parallel at the center of the radial shape so that the polarity is the same. The other end of each coil is connected to the outside of the radiating shape and is opened to be present in the magnetic antenna.
• a seventh aspect of the present invention is a magnetic antenna manufactured using LTCC technology for transmitting and receiving a magnetic field component, wherein magnetic powder is mixed with a binder and formed into a sheet shape.
• a through hole is made in a magnetic layer having a single layer or a multi-layer structure, an electrode material is poured into the through hole, and an electrode material is formed on both sides of the magnetic layer orthogonal to the through hole.
• An electrode layer is formed with a material, and a coil is formed by punching the magnetic layer at a position passing through the center of the through hole, and the magnetic layer of the coil is sandwiched by an insulating layer from the upper surface and the lower surface.
• the insulating layer disposed on the insulating layer is punched into a shape covering the electrode layer.
• a conductive layer made of the same material as the electrode material is further provided on the lower surface of the insulating layer on the lower surface of the magnetic layer, and cut into individual pieces and fired.
• a plurality of coils having a planar shape constituted by a rectangular or rectangular magnetic layer are arranged in a radiating manner at almost equal intervals in a plan view, and One end is opened toward the center of the radial shape, and the other end of each coil is directed toward the outside of the radial shape and is mutually connected across the annular portion on the outer peripheral side so that the polarity is the same. It is characterized by being connected by a magnetic layer. Exists in the magnetic antenna.
• the conductive layer is provided by the LTCC technology, so that the wire having good adhesion between the laminated layers and the added conductive layer can be stably coupled.
• the force can also be adjusted by a single element that does not need to be adjusted in the operating environment.
• a conductive layer is added, characteristics do not fluctuate even when approaching a metal object.
• a plurality of elements can be stably manufactured from a single sheet, variations in each element can be suppressed, mass productivity can be improved, and manufacturing costs can be reduced.
• the magnetic antenna according to the first to third aspects of the present invention has a small change of the resonance frequency of 1MHz or less when it is attached to a metal surface, the frequency range from 125KHz to 2.45GHz is wide.
• a communication distance of 3cm or more can be obtained even if the tag is attached to a metal surface.
• the green sheet stacking structure symmetrical vertically with respect to the central coil, it is possible to suppress warping after firing to 0.5 mm or less per long side lcm. It can be used as a practical antenna.
• the magnetic antennas according to the fourth to seventh aspects of the present invention can further suppress fluctuations in characteristics when attached to a metal object by providing a magnetic layer outside the conductive layer. I can do it.
• the magnetic antenna of the present invention can be used not only for the RFID tag reader Z writer but also for the RFID tag. Depending on the selection of the magnetic layer to be the core of the coil, the magnetic antenna can be 125 kHz to 2.45 GHz. It is applicable in a wide frequency range.
• FIG. 1 is a perspective view showing a laminated structure of a coil portion of a magnetic antenna according to the first to third aspects of the present invention.
• FIG. 2 is a perspective view showing Example 1 which is a magnetic antenna according to the first to third aspects of the present invention.
• FIG. 3 is a perspective view showing Example 2, which is a magnetic antenna according to the first to third aspects of the present invention.
• FIG. 4 is a perspective view showing Example 3 which is a magnetic antenna according to the first to third aspects of the present invention.
• FIG. 5 is a perspective view showing Example 4 which is a magnetic antenna according to the first to third aspects of the present invention.
• FIG. 6 is a perspective view showing Example 5, which is a magnetic antenna according to the first to third aspects of the present invention.
• FIG. 7 is a perspective view showing Example 6 which is a magnetic antenna according to the first to third aspects of the present invention.
• FIG. 8 is a perspective view showing a laminated magnetic antenna as Comparative Example 1 having no conductive layer.
• FIG. 9 is a perspective view showing Example 7 which is a magnetic antenna according to the fourth to seventh aspects of the present invention.
• FIG. 10 is a perspective view showing Example 8 which is a magnetic antenna according to the fourth to seventh aspects of the present invention.
• FIG. 11 is a circuit diagram schematically showing an example in which three coils are connected in series and capacitors are connected in parallel between both ends of the magnetic antenna shown in FIGS. 9 and 10.
• FIG. 12 is a circuit diagram schematically showing an example in which three coils are connected in series and capacitors are connected in series between both ends of the magnetic antenna shown in FIGS. 9 and 10.
• FIG. 13 is a circuit diagram schematically showing an example in which three coils are connected in parallel and capacitors are connected in parallel between both ends of the magnetic antenna shown in FIGS. 9 and 10. Explanation of symbols [0020] 11: Through hole
• the magnetic antenna of the present invention is generally configured by sandwiching a coil 14 as shown in FIG. 1 from above and below with an insulating layer 16 as shown in FIG.
• the coil 14 is composed of a magnetic layer 15 having a planar or rectangular shape as shown in FIG.
• the magnetic layer 15 has a single-layer or multi-layer structure, and each layer is formed into a sheet by mixing magnetic powder with a binder.
• the magnetic layer 15 has A through hole 11 is opened, and an electrode material is poured into the through hole 11.
• electrode layers 12 are formed of an electrode material on both surfaces of the magnetic layer 15 orthogonal to the through holes 11.
• the electrode layer 12 is connected to the through hole 11. Thereby, both ends of the magnetic layer 15 forming the coil 14 are configured to be open on the magnetic circuit.
• the coil 14 on which the electrode layer 12 is printed is sandwiched between the upper and lower surfaces of the insulating layer 16, and the conductive layer 17 is provided on the upper surface of one or both of the insulating layers. .
• the above laminate comprising the coil 14, the insulating layer 16 and the conductive layer 17 is cut at the through hole 11 and the coil open end face 13 and integrally fired.
• mass productivity can be improved by utilizing the LTCC (Low Temperature Co-fired Ceramics) technology.
• a coil lead terminal 19 and an IC chip connection terminal 18 may be provided as shown in FIG. That is, the through-hole 11 is provided in the insulating layer 16 on the upper and lower surfaces of the coil 14 on which the electrode layer 12 is printed, and the electrode material is poured into the through-hole 11. Connected. Further, a coil lead terminal 19 and an IC chip connection terminal 18 are printed on the surface of the insulating layer 16 with an electrode material. Then, the laminated body including the coil 14, the insulating layer 16, and the conductive layer 17 is integrally fired.
• the magnetic antenna of the present invention may be provided with the magnetic layer 15 on the lower surface of the insulating layer 16 having the conductive layer 17 and may be integrally fired.
• the characteristic change becomes smaller and the change in the resonance frequency can be made smaller.
• a conductive layer 17 is provided on the upper surface of the insulating layer 16
• a magnetic layer 15 is provided on the lower surface of the insulating layer 16
• an insulating layer 16 is provided on the lower surface of the magnetic layer. And may be integrally fired.
• the magnetic antenna of the present invention may include a capacitor electrode 1C as shown in FIG. That is, the capacitor electrode 1C is disposed on one or both outer surfaces of the insulating layer 16 sandwiching the upper and lower surfaces of the coil 14, and the capacitor electrode 1C is disposed.
• An insulating layer 16 is further provided on the outer surface of the insulating layer 16, and an electrode is printed on the outer surface of the insulating layer to form a capacitor so as to sandwich the insulating layer.
• the coil 14 is connected to the IC chip connection terminal 18 and the coil lead terminal 19 in parallel or in series.
• a capacitor is formed by printing parallel electrodes or comb-shaped electrodes on the upper surface of the insulating layer, and the coil 14 is connected in parallel or in series with the coil lead terminal. Also good.
• the capacitor 1 may be a parallel flat plate structure sandwiching the insulating layer 16 or a comb-shaped or parallel electrode planar structure. In the parallel plate structure, as shown in FIG. 6, one capacitor electrode may also serve as the IC chip connection terminal 18.
• the magnetic antenna of the present invention is manufactured by using a Ni—Zn ferrite magnetic material for the magnetic layer 15 and firing it as a single body.
• the composition of the ferrite powder used is Fe O: 45-49.5 mol
• NiO 9. 0 ⁇ 45 0 mole 0/0
• ZnO 0. 5 ⁇ 35 0 mole 0/0
• Such a composition with a preferred% is preferably selected so that the magnetic loss is high and the magnetic loss is low in the frequency band to be used. If the permeability is too low, the number of coil turns required to form with LTCC technology becomes too large and difficult to manufacture. On the other hand, if the magnetic permeability is too high, the loss increases, making it unsuitable for an antenna. For example, when applying to RFID tags, select the ferrite composition so that the permeability is 70-120 at 13.56 MHz, and for commercial FM broadcast reception, the permeability at 100 MHz is 10-30. Is preferred.
• the sintering temperature of ferrite is 800-1000. C, preferably 850-920. C.
• Zn-based ferrite is used for the insulating layer 16.
• ferrite powder it is preferable to select a Zn-based ferrite having a composition such that the volume resistivity of the sintered body is 10 8 ⁇ cm or more. That is, the composition of the Zn-based ferrite, Fe O:. 45 ⁇ 49 5 Monore 0/0, ZnO:
• glass ceramic is used for the insulating layer 16.
• a glass-based ceramic borosilicate glass, zinc-based glass, lead-based glass, or the like can be used.
• the magnetic antenna of the present invention has a terminal to which an IC chip can be connected on the upper surface of the insulating layer 16, and the terminal is connected in parallel or in series with the IC chip connection terminal 18. Body firing may be performed.
• a terminal for providing a variable capacitor The lead terminal may be connected in parallel or in series.
• an Ag paste is suitable as the electrode material, and other metal-based conductive pastes such as other Ag-based alloy pastes can also be used.
• the magnetic antenna of the present invention is an antenna for transmitting and receiving a magnetic field component.
• the magnetic antenna 21 has a rectangular planar shape or a rectangular shape.
• a coil is formed.
• a plurality of such coils are arranged radially at substantially equal intervals in plan view.
• One end of each coil is connected to each other by a magnetic layer at the center of the radial shape, and the other end of each coil is opened toward the outside of the radial shape.
• One end of each coil is connected to each other in series (see Fig. 11 and Fig. 12) or in parallel (see Fig. 13) so that the polarity is the same.
• an insulating layer 23 is provided on one or both of the upper and lower surfaces of the coil in plan view, and a conductive layer 24 is provided on the outer side of the one insulating layer 23.
• the magnetic antenna of the present invention is a magnetic antenna for transmitting and receiving a magnetic field component, and as shown in FIG. 10, another rectangular or rectangular magnetic layer 21 similar to the above is shown.
• a plurality of coils are arranged radially at substantially equal intervals in plan view.
• One end of each coil is opened toward the center of the radial shape, and the other end of each coil is directed to the outside of the radial shape and connected by a magnetic layer at the annular portion on the outer peripheral side.
• the other ends of the coils are connected to each other in series or in parallel so that their polarities are the same.
• an insulating layer 23 is provided on one or both of the upper and lower surfaces of the coil in plan view, and a conductive layer 24 is provided on the outer side of the one insulating layer 23.
• Each of the magnetic antennas described above is manufactured using LTCC technology, and the magnetic layer 21 constituting the coil has a single-layer or multi-layer structure, and each layer is a temporary layer.
• the fired magnetic powder is mixed with a binder and formed into a sheet.
• a through hole is opened in the magnetic layer 21, and an electrode material is poured into the through hole.
• electrode layers are formed of an electrode material on both surfaces of the magnetic layer 21 orthogonal to the through hole.
• the electrode layer The magnetic layer 21 containing is stamped into a coil structure at a position including an extension of a line passing through the center of the through hole. That is, the coil electrode 26 is formed by the through-hole cross section.
• the molded magnetic layer 21 (coil) is sandwiched between the upper and lower surfaces and the insulating layer 23.
• the insulating layer 23 disposed on the upper surface of the magnetic layer on which the electrode layer is printed is punched into a shape covering the electrode layer 24.
• a conductive layer 24 having the same material force as that of the electrode material is provided on the lower surface of the insulating layer 23 on the lower surface of the magnetic layer 21. And it cut
• the magnetic antenna obtained as described above is obtained by arranging a plurality of coils in which the planar shape of the magnetic layer 21 is formed in a square shape or a rectangular shape. One end of the coil is connected by the magnetic layer 21 and the other end is open. The coils are connected in series or in parallel so that the polarities of the coils are the same. Since the opposing coils have the same polarity, the component parallel to the metal surface of the magnetic field 27 is canceled (see Fig. 11), and only the component perpendicular to the metal surface is obtained (Fig. 9). And Figure 10).
• the through hole is formed on the insulating layer 23 on the upper and lower surfaces of the coil on which the electrode layer 24 is printed, or on the insulating layer 23 on the surface opposite to the surface on which the conductive layer 24 is provided.
• the coil lead terminal 29 may be printed with the electrode material on the surface of the insulating layer 23 so that the electrode material is poured into the through hole and connected to both ends of the coil end and end of the coil.
• a magnetic layer 25 may be provided outside the conductive layer 24. When the magnetic layer 25 is provided on the outer side of the conductive layer 24, the change in the resonance frequency when the magnetic antenna is attached to the metal surface can be further reduced as compared with the case where only the conductive layer 24 is provided.
• an insulating layer may be provided on the outer side of the magnetic layer outside the conductive layer 24. This balances the stress generated between the layers in the laminated structure including the coil, and can reduce the warpage.
• a square or circular shape is sandwiched between the upper surface of the insulating layer 23 that sandwiches the upper and lower surfaces of the coil so that the circuit shown in FIGS.
• An insulating layer on which electrodes are printed to form a capacitor 28 is provided.
• the electrode 28 may be connected in parallel (see FIGS. 11 and 13) or in series (see FIG. 12) with the electrode force coil lead terminal electrode 29 of the sensor 28.
• a capacitor 28 is formed by printing parallel electrodes or comb-shaped electrodes on the upper surface of the insulating layer 23 sandwiching the coil so as to obtain a circuit as shown in FIGS. 11 to 13.
• the lead terminal 29 may be connected in parallel (see FIGS. 11 and 13) or in series (see FIG. 12).
• An example of a specific print pattern is shown in FIG.
• the capacitor 28 may be a parallel plate structure sandwiching the insulating layer 23 or a planar structure of a comb shape or parallel electrodes. In the parallel plate structure, one capacitor electrode may also serve as an IC chip connection terminal.
• the magnetic antenna of the present invention uses a Ni—Zn ferrite magnetic material for the magnetic layer 21 and is integrally fired in the same manner as in the magnetic antenna according to the first to third aspects described above. Manufactured.
• the composition of the ferrite powder and the sintering temperature of the ferrite are the same as in the magnetic antenna described above.
• the composition of the insulating layer 23 is the same as that of the magnetic antenna described above, and glass ceramics can be used for the insulating layer 23 as in the case of the magnetic antenna described above.
• the magnetic antenna of the present invention has a terminal structure to which an IC chip can be connected to the upper surface of the insulating layer 23, as in the case of the magnetic antenna described above, and the terminal is parallel to the coil lead terminal 29 or They may be connected in series.
• an Ag paste is suitable as the electrode material, and other metal conductive pastes such as other Ag-based alloy pastes can also be used.
• the magnetic antenna of the present invention was manufactured using LTCC technology.
• the magnetic layer 15 was formed.
• the magnetic permeability mosquito 100 at 13. 56 MHz after sintering at 900 ° C ⁇ over 211-01 Feraito calcined powder ⁇ 6 0:?. 48 5 mole 0/0, NiO: 25 mole 0/0 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 obtained slurry was applied onto a PET film with a doctor blade, and a sheet was molded so as to have a 150 mm square and a thickness of 0.1 mm upon sintering.
• a slurry was prepared by mixing 8 parts by weight of a resin, 5 parts by weight of a plasticizer, and 80 parts by weight of a solvent with a ball mill. The resulting slurry was applied onto a PET film with a doctor blade, and a sheet was molded to the same size and thickness as the magnetic layer.
• each of the above green sheets was pressure-bonded together, cut at the through hole 11 and the open end face 13 of the coil, and then fired integrally at 900 ° C for 2 hours to obtain a size of 18 mm in width.
• a magnetic antenna (sample 1) with a length of 4 mm and a coil winding number of 32 turns was manufactured. (For simplicity, the number of coil turns is indicated by 7 turns in FIGS. 1 and 2 and the number of magnetic layers is indicated by 3 layers. The same applies to other figures. )
• an RFID tag IC was connected to both ends of the coil of the above magnetic antenna, and a capacitor was connected in parallel with the IC, and the resonance frequency was adjusted to 13.1 MHz to produce an RFID tag.
• An RFID tag was attached to a metal plate, and the communicable distance was measured with a reader Z writer with an output of 10 mW. Moreover, the curvature of the magnetic antenna was measured.
• Each measurement method is as follows.
• Resonance frequency is measured by connecting a one-turn coil to an impedance analyzer (product name: 4291A, manufactured by Hewlett-Packard Company) and combining it with an RFID tag.
• the peak frequency of the impedance was used as the resonance frequency.
• the adjustment was performed by selecting the position of the coil electrode exposed on the end face of the magnetic antenna and adjusting the inductance.
• the resonant frequency can be adjusted by changing the capacitance of the capacitor connected in parallel with the IC.
• the communication distance is 10mW.
• the reader Z writer product name; UR WI-201, manufactured by Efficy Co., Ltd.
• the reader Z writer is fixed horizontally, and the RFID tag attached to the metal plate is placed horizontally above the antenna.
• the RFID tag was moved within a range where communication was possible at 13.56 MHz, and the maximum vertical distance between the antenna and the RFID tag was measured as the communication distance.
• the warp in the magnetic antenna was 0.6 mm, which was in a practical range.
• the RFID tag using a magnetic antenna has a small resonance frequency fluctuation of + 1MHZ before and after the metal plate is attached, and a communication distance of 3 cm can be obtained when attached to the metal surface.
• a green sheet as the magnetic layer 15 similar to that in Example 1 and a green sheet as the insulating layer 16 having a glass ceramic force instead of Zn—Cu ferrite were used. As shown in FIG. 3, five green sheets constituting the magnetic layer 15 are stacked, through holes 11 are formed in the green sheets, and Ag paste is filled therein, and Ag paste is formed on both sides orthogonal to the through holes 11.
• the coil 14 was formed by printing.
• a green sheet constituting the insulating layer 16 was laminated on one surface of the coil 14.
• the conductive layer 17 was printed on the insulating layer 16 with Ag paste.
• another insulating layer 16 is laminated, and in this insulating layer 16, a through hole 11 is formed so as to be connected to both ends of the coil 14, and Ag paste is filled in the through hole 11.
• Coil lead terminals 19 and IC chip connection terminals 18 for connecting ICs were printed with Ag paste on the surface layer of the insulating layer orthogonal to the holes 11.
• each of the above green sheets was pressure-bonded together, cut at the through-hole 11 and the open end face 13 of the coil, and then integrally fired at 900 ° C for 2 hours.
• an RFID tag IC is connected to both ends of the coil of the magnetic antenna, and a capacitor is connected in parallel to the IC, and the resonance frequency is adjusted to 13.1 MHz.
• An RFID tag was attached to a metal plate, and the distance and resonance frequency that could be communicated with a reader Z writer with an output of 10 mW were measured.
• the warpage in the above magnetic antenna was 1. Omm, which was in the practical range.
• the RFID tag using a magnetic antenna had a resonance frequency of 14.1 MHz when the metal plate was attached, and the resonance frequency fluctuation before and after the metal plate was attached was +1 MHz.
• a communication distance of 3.1 cm was obtained when it was attached to a metal surface.
• the same green sheet as the magnetic layer 15 as in Example 1 and the green sheet as the insulating layer 16 were used. As shown in FIG. 4, five green sheets constituting the magnetic layer 15 are laminated, through holes 11 are formed in the green sheets, and Ag paste is filled therein, and Ag paste is formed on both sides orthogonal to the through holes 11.
• the coil 14 was formed by printing.
• a green sheet constituting the insulating layer 16 was laminated on the lower surface of the coil 14. At that time, the conductive layer 17 was printed on the insulating layer 16 with Ag paste. Further, a green sheet as the magnetic layer 15 was laminated on the lower surface of the insulating layer 16. Further, a green sheet constituting the insulating layer 16 was laminated on the upper surface of the coil 14. On the upper surface of the insulating layer 16, a through hole 11 is formed so as to connect to both ends of the coil 14, and an Ag paste is filled therein, and the surface layer of the insulating layer perpendicular to the through hole 11 is formed. The coil lead terminal 19 and the IC chip connection terminal 18 for connecting the IC were printed with Ag paste.
• each of the above green sheets was pressure-bonded together, cut at the through hole 11 and the coil open end face 13, and then integrally fired in the same manner as in Example 1 to obtain a size of 18 mm in width.
• a magnetic antenna (sample 3) with a length of 4 mm and a coil winding number of 32 turns
• an RFID tag IC is connected to the IC chip connection terminal 18 of the magnetic antenna, and a capacitor is connected in parallel with the IC, so that the resonance frequency is 13.1M.
• the RFID tag was created by adjusting to Hz.
• An RFID tag was attached to a metal plate, and the distance and resonance frequency at which communication was possible with a reader Z writer with an output of 1 OmW were measured.
• the warpage of the magnetic antenna was measured.
• the warpage in the above magnetic antenna was 0.8 mm, which was within the practical range.
• the RFID tag using a magnetic antenna had a smaller fluctuation with a resonance frequency fluctuation of +0.5 MHz before and after the metal plate was attached.
• a communication distance of 3.3 cm was obtained when it was attached to a metal surface.
• the same green sheet as the magnetic layer 15 as in Example 1 and the green sheet as the insulating layer 16 were used. As shown in FIG. 5, five green sheets constituting the magnetic layer 15 are laminated, through holes 11 are formed in the green sheets, and Ag paste is filled therein, and Ag paste is formed on both sides orthogonal to the through holes 11.
• the coil 14 was formed by printing.
• a conductive layer 17 was printed on the lower insulating layer 16 with an Ag paste.
• a green sheet constituting the magnetic layer 15 was laminated on the lower surface of the two insulating layers 16, and a green sheet as the insulating layer 16 was further laminated on the lower surface.
• the insulating layer 16 on the upper surface side of the coil 14 is formed with a through hole 11 so as to be connected to one end of the coil 14 and filled with an Ag paste, and the insulation perpendicular to the through hole 11 is provided.
• the coil lead terminal 19 and one of the IC chip connection terminals 18 for connecting the IC were printed with Ag paste.
• a through hole 11 is formed so as to be connected to the other end of the coil 14 and several places in the middle, and an Ag paste is filled therein.
• a coil lead terminal 19 and an IC chip connection terminal 18 for connecting the IC were printed with Ag paste on the surface layer of the insulating layer orthogonal to the surface. The coil lead terminal 19 The ends were drawn out to face each other.
• each of the above green sheets was pressure-bonded together, cut at the through hole 11 and the open end face 13 of the coil, and then fired integrally at 900 ° C for 2 hours to obtain a size of 18 mm in width.
• the RFID tag IC is connected to the IC chip connection terminal 18 of the magnetic antenna, and the arbitrary end surfaces of the coil lead terminal 19 facing each other are connected to each other.
• the RFID tag was created by short-circuiting with conductive paint, adjusting the inductance, and adjusting the resonance frequency to 13.1 MHz.
• An RFID tag was attached to the metal plate, and the distance and resonance frequency at which communication was possible with a reader Z writer with an output of 1 OmW were measured.
• the warpage of the magnetic antenna was measured.
• the warp in the above magnetic antenna was 1. Omm, which was extremely small.
• the RFID tag using a magnetic antenna has a small fluctuation of the resonance frequency of +0.5 MHz before and after the metal plate is attached, and a communication distance of 3.4 cm is obtained when it is attached to the metal surface.
• the same green sheet as the magnetic layer 15 as in Example 1 and the green sheet as the insulating layer 16 were used. As shown in FIG. 6, five green sheets constituting the magnetic layer 15 are laminated, through holes 11 are formed in the green sheets, and Ag paste is filled therein, and Ag paste is formed on both sides orthogonal to the through holes 11.
• the coil 14 was formed by printing.
• a conductive layer 17 was printed on the lower insulating layer 16 with an Ag paste. Further, a green sheet as a magnetic layer 15 was laminated on the lower surface. A green sheet as a magnetic layer 15 and an insulating layer 16 was laminated on the upper surface side of the coil 14. At that time, the green sheet constituting the insulating layer 16 on the upper surface side of the coil 14 is formed with a through hole 11 so as to be connected to both ends of the coil 14 and filled with Ag paste. Capacitor electrode 1C was printed with Ag paste on the surface layer of the insulating layer that was orthogonal.
• an IC for RFID tag is connected to the IC chip connection terminal 18 of the magnetic antenna, and further, a part of the IC chip connection terminal 18 is scraped off to adjust the capacitance to adjust the resonance frequency. 13. Adjusted to 1MHz and created RFID tag. An RFID tag was attached to a metal plate, and the distance and resonance frequency at which communication was possible with a reader Z writer with an output of 10 mW were measured. In addition, the warpage of the magnetic antenna was measured. As a result, the warpage of the magnetic antenna was 0.1 mm, which was extremely small. The RFID tag using a magnetic antenna has a small fluctuation of the resonance frequency of +0.5 MHz before and after the metal plate is attached, and a communication distance of 3.3 cm can be obtained when attached to the metal surface.
• a green sheet constituting the magnetic layer 15 was prepared.
• 900 permeability at sintering after 100 MHz z of ° C is 20 Ni- Zn- Cu ferrite calcined powder (Fe O:. 48 5 mole 0/0, NiO
• a green sheet constituting the insulating layer 16 was prepared. Like the ⁇ Karu green sheet also above, Zn- Cu ferrite calcined powder (Fe O:. 48 5 mole 0/0, ZnO: 40 mol 0/0, CuO:
• each of the above green sheets was pressure-bonded together, cut at the through-hole 11 and the open end face 13 of the coil, and then fired integrally at 900 ° C for 2 hours, resulting in a size of 18 mm in width.
• FM radio 1R was connected to both ends of the coil of the above magnetic antenna, and a capacitor was further connected in parallel with coil 14 to adjust the resonance frequency to 82 MHz to obtain an FM broadcast receiving antenna.
• This is a force that assumes that an antenna is installed outside the metal housing of a mobile phone or the like.
• FM broadcasting 82 MHz
• a good reception state was obtained.
• the warpage of the magnetic antenna was measured, the warpage was as small as 0.6 mm.
• a magnetic antenna (Sample 7) was manufactured in the same manner as in Example 1 except that the conductive layer 17 in Example 1 was not provided.
• an RFID tag IC is connected to both ends of the coil of the magnetic antenna, and a capacitor is connected in parallel with the IC, and the resonance frequency is adjusted to 13.1 MHz. It was created.
• an RFID tag was attached to the metal plate, and the communicable distance and the resonance frequency were measured in the same manner as in Example 1, and the warpage of the magnetic antenna was measured.
• the warpage in the above magnetic antenna was 1. Omm.
• the RFID tag using a magnetic antenna has a large resonance frequency fluctuation of +1.5 MHz before and after the metal plate is attached, and the communication distance when attached to the metal surface is only 1.4 cm. .
• a general commercially available IC card type tag product name: Texas Instruments, manufactured by connecting ICs to both ends of an antenna coil spirally wired on the surface of a film-like resin
• Tag —ItTMHF Tag —ItTMHF
• Example 7 The magnetic antenna of the present invention was manufactured using LTCC technology. First, the magnetic layer 21 was formed. In the production of the magnetic layer 21, as in Example 1, a calcined powder of flour, butyral resin, a plasticizer, and a solvent were mixed with a ball mill to produce a slurry, and the resulting slurry was obtained as in Example 1. The sheet was molded in the same manner. Insulating layer 23 was prepared in the same manner as in Example 1.
• the insulating layer 23 was prepared by mixing a Zn—Cu flake calcined powder, a petal resin, a plasticizer, and a solvent with a ball mill to produce a slurry, and the obtained slurry was used in the Example.
• the sheet was molded in the same manner as in 1.
• each of the above green sheets is pressure-bonded together, cut into individual coil pieces (single pieces), and then integrally fired at 900 ° C for 2 hours to produce one coil.
• a magnetic antenna (sample 8) with a length of 20 mm and a number of turns of each coil of 10 turns was manufactured.
• Figure 9 shows a schematic diagram of the magnetic antenna obtained. In the figure, the number of turns of the coil is shown in a simplified manner.
• an RFID tag reader Z writer is connected to both ends of the coil of the magnetic antenna, and a capacitor is connected in parallel with the reader Z writer, and the resonance frequency is adjusted to 13.56 MHz. It was attached to a metal plate and the communication distance with the RFID tag was measured.
• the resonant frequency measurement and adjustment method and the communication distance measurement method are as follows.
• impedance analyzer manufactured by Hewlett-Packard Company, The product name: 4291A
• the adjustment was made by changing the capacitance of the capacitors connected in parallel or in series.
• the communication distance is the output lOOmW reader Z writer (manufactured by Takaya Co., Ltd., product name; D002A), the standard antenna is removed and the magnetic antenna of the present invention is connected and fixed horizontally. Instrument IC card type tag, product name; Tag—it (TM) HF) is positioned horizontally, and the R FID tag is moved within the communication range at 56 MHz, and the antenna at that time The maximum vertical distance between the RFID tag and the RFID tag was measured as the communication distance.
• Instrument IC card type tag, product name; Tag—it (TM) HF Instrument IC card type tag, product name; Tag—it (TM) HF
• the reader Z writer using the above magnetic antenna has a small fluctuation of resonance frequency of +1 MHz before and after the metal plate is attached, A communication distance of 3cm was obtained when it was attached to a metal surface.
• a green sheet as the magnetic layer 21 similar to that in Example 7 and a green sheet as the insulating layer 23 having a glass ceramic force instead of Zn—Cu ferrite were used.
• Five green sheets composing the magnetic layer 21 were laminated, through holes were opened in this, and Ag paste was filled therein.
• an Ag paste constituting the coil electrode 22 was printed on one surface orthogonal to the through holes of the two green sheets.
• each of the above green sheets is pressure-bonded together, and each coil piece ( After being cut as individual pieces, the magnetic antenna (sample 9) having a diameter of 10 mm and a number of turns of each coil of 7 turns was manufactured by firing at 900 ° C. for 2 hours.
• Figure 10 shows a schematic diagram of the magnetic antenna obtained. In the figure, the number of turns of the coil is shown in a simplified manner.
• an RFID tag reader Z writer is connected to both ends of the coil of the magnetic antenna, and a capacitor is connected in parallel or in series with the reader Z writer to adjust the resonance frequency to 13.56 MHz.
• the resonance frequency and the communication distance with the RFID tag when attached to a metal plate were measured in the same manner as in Example 7.
• the reader Z writer using the above magnetic antenna has a small resonance frequency fluctuation of +0.5 MHz before and after the metal plate is attached, and a communication distance of 3.4 cm when attached to the metal surface. was gotten.
• a magnetic antenna (Sample 10) was manufactured by the same process as Example 7 except that the conductive layer 24 shown in FIG. 9 was omitted.
• the RFID tag reader Z writer is connected to both ends of the coil of the magnetic antenna, and a capacitor is connected in parallel or in series with the reader Z writer to adjust the resonance frequency to 13.56 MHz.
• the communication distance with the RFID tag when pasted on a metal plate was measured in the same manner as in Example 7. As a result, the change in resonance frequency before and after the metal plate was affixed was +2.3 MHz, and the communication distance when the metal plate was affixed was 1.6 cm.
• a commercially available reader Z writer antenna that was spirally wired on the surface of a plate-like resin was attached to a metal plate, and the distance to communicate with the RFID tag was measured.
• the antenna size was 30mm x 55mm and the number of coil turns was 3 turns.
• the communication distance when the metal plate was affixed was 0.5 cm.

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• 2006
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