Magnetic Antenna

A magnetic antenna and magnetic layer technology, applied to antennas, antenna components, loop antennas with ferromagnetic material cores, etc., can solve problems such as transmission and reception, magnetic antenna characteristic changes, and characteristic deviations, so as to reduce manufacturing costs and improve Mass productivity and the effect of suppressing variation

Active Publication Date: 2013-05-08
TODA IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in the above-mentioned magnetic antenna applied to RFID tags, when the coil of the winding comes into contact with a metal object, the contact surface between the winding and the metal plate becomes unstable, resulting in a problem that the characteristics vary.
On the other hand, in the reader/writer for RFID tags, it is desired to use a magnetic antenna that can transmit and receive signals with only one electrode. Generates a magnetic field, so there is a problem of sending and receiving signals at the two poles that are separated
In addition, in order to solve this problem, an improved magnetic antenna has been developed. However, i

Method used

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Examples

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Effect test

Embodiment 1

[0060] LTCC technology is used to manufacture the magnetic antenna of the present invention. First, the magnetic layer 15 is produced. In the manufacturing process of the magnetic layer 15, a ball mill was used to mix the Ni-Zn-Cu ferrite calcined powder (Fe) with a permeability of 100 at 13.56MHz after firing at a temperature of 900°C. 2 O 3 : 48.5 mol%, NiO: 25 mol%, ZnO: 16 mol%, CuO: 10.5 mol%. ) 100 parts (weight unit), 8 parts butyral resin (weight unit), 5 parts plasticizer (weight unit), 80 parts solvent (weight unit) to make the adhesive. The obtained adhesive liquid (slurry) was coated on a PET film using a doctor blade, and a sheet was formed into a square with a side length of 150 mm and a thickness of 0.1 mm during firing.

[0061] In addition, in the manufacturing process of the insulating layer 16, the same as the above, a ball mill was used to mix Zn-Cu ferrite calcined powder (Fe 2 O 3 : 48.5 mol%, ZnO: 41 mol%, CuO: 10.5 mol%) 100 parts, 8 parts of butyral resi...

Embodiment 2

[0073] The same green sheet as the magnetic layer 15 as in Example 1 and a green sheet made of glass-based ceramics as the insulating layer 16 were used instead of the Zn-Cu ferrite. Such as image 3 As shown, five green sheets constituting the magnetic layer 15 are laminated, a through hole 11 is opened and silver paste is filled therein, and the silver paste is printed on two surfaces orthogonal to the through hole 11, thereby forming a coil 14.

[0074] Next, a green sheet constituting the insulating layer 16 is laminated on one surface of the coil 14. At this time, the conductive layer 17 is printed with silver paste on the insulating layer 16. In addition, another insulating layer 16 is laminated on the other surface of the coil 14. On the insulating layer 16, through holes 11 are opened for connection with both ends of the coil 14, and silver paste is filled in the insulating layer 16, and the On the surface of the insulating layer where the holes 11 are orthogonal to eac...

Embodiment 3

[0078] The same green sheet as the magnetic layer 15 and the green sheet as the insulating layer 16 as in Example 1 were used. Such as Figure 4 As shown, five green sheets constituting the magnetic layer 15 are laminated, a through hole 11 is opened thereon, and silver paste is filled therein, and silver paste is printed on both sides orthogonal to the through hole 11, thereby forming the coil 14.

[0079] Next, a green sheet constituting the insulating layer 16 is laminated under the coil 14. At this time, the conductive layer 17 is printed with silver paste on the insulating layer 16. Furthermore, a green sheet as the magnetic layer 15 is laminated under the insulating layer 16. A green sheet constituting the insulating layer 16 is laminated on the upper surface of the coil 14. On the upper surface of the insulating layer 16, through holes 11 are opened for connection with both ends of the coil 14, and silver paste is filled therein, and the surface layer of the insulating l...

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Abstract

There is provided a magnetic antenna, suitable for use in an RFID tag and an RFID tag reader/writer, which operates stable even if brought close to a metallic object and suitable for mass-production. The magnetic antenna has a coil comprising a magnetic layer and a conductive layer provided on the magnetic layer via an insulating layer. Alternatively, the magnetic antenna has a plurality of coils each comprising a magnetic layer having a square or rectangular shape and arranged radially. One ends of the coils are connected in series or parallel to one another by the magnetic layers thereof such that the coils have the same polarity. An insulating layer is provided on one or both outer surface of the coils, and a conductive layer is provided on an outer surface of at least one of the insulating layers. The magnetic antenna is produced using an LTCC technology.

Description

[0001] This application is a divisional application of the same name application with the application number 200680023105.2 filed on July 6, 2006. Technical field [0002] The present invention relates to a magnetic antenna. Specifically, it is a magnetic antenna for communication using magnetic field components, which can transmit and receive signals with good sensitivity even when added to an object made of metal . The magnetic antenna of the present invention is particularly suitable for RFID tags (tags) and reader / writers for RFID tags. Background technique [0003] For an antenna that uses a magnetic body to transmit and receive electromagnetic waves (hereinafter referred to as "magnetic antenna"), a wire is wound around a magnetic body to form a coil, and the magnetic field component coming in from the outside penetrates the magnetic body and induces it in the coil. , An antenna that converts magnetic field components into voltage (or current), which has been widely used in...

Claims

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Application Information

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IPC IPC(8): H01Q1/36H01Q1/22H01Q7/06
CPCH01Q1/362H01Q1/2283H01Q7/08H01Q1/24
Inventor 木村哲也佐藤由郎
Owner TODA IND
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