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Absorber for radio-frequency identificating antenna, preparation method thereof and radio-frequency identificating antenna using the same

A magnetic sheet and antenna technology, applied in the field of RFID antennas, can solve the problems of too thick magnetic sheet RFID antennas and lack of features, and achieve the effects of high yield, noise attenuation, and high inductance.

Active Publication Date: 2011-10-05
AMOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, the magnetic sheet made of this soft powder does not have excellent characteristics as an absorber for RFID, and the thickness of the magnetic sheet is still too thick for the application of RFID antenna

Method used

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  • Absorber for radio-frequency identificating antenna, preparation method thereof and radio-frequency identificating antenna using the same
  • Absorber for radio-frequency identificating antenna, preparation method thereof and radio-frequency identificating antenna using the same
  • Absorber for radio-frequency identificating antenna, preparation method thereof and radio-frequency identificating antenna using the same

Examples

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Effect test

Embodiment 1 and Embodiment 2

[0118] In order to obtain the same structure as in Example 1 in FIG. 2A , a copper antenna coil was formed on a 0.20 mm thick polyimide insulating layer by etching the copper antenna coil to a 10z specification (ie, a coil thickness of 0.04 mm).

[0119] On the other hand, an amorphous alloy Fe-Si-B is made to form a magnetic sheet used as an absorbing sheet. The starting material Fe-B can be used as a master alloy. Electrolytic iron Fe and Si are mixed with the starting material Fe-B to adjust the composition ratio, and then melted together in a furnace to make Fe 79 (Si,B) 21 ingot iron. After the ingot iron is produced in the high-frequency induction furnace, the high-frequency induction furnace is switched on to apply high-frequency energy to the ingot iron, so that the ingot iron is completely melted. After that, the molten metal at high temperature was sprayed on a cooling roll rotating at a high speed through nozzles, thereby forming an amorphous alloy ribbon with an...

Embodiment 3 and Embodiment 4

[0123] FINEMET (registered trademark) of Hitachi Corporation of Japan or Fe of Vitroperm (registered trademark) of Vacuumschmelze Company of Germany 73.5 Cu 1 Nb 3 Si 13.5 B 9 Compositions can be used as alloys for the magnetic sheets of Example 3 and Example 4. The fabrication method of the RFID was the same as in Example 1, except that the magnetic sheet was made 0.20 mm thick (Example 3) or 0.25 mm thick (Example 4).

Embodiment 5

[0125] Fe-B can be used as a starting material for an alloy for forming a magnetic sheet. In order to adjust the composition ratio, electrolytic iron (Fe) and Zr are added to prepare 90 Zr 7 B 3 composed of amorphous alloys. The fabrication method of the RFID antenna is the same as in Embodiment 1 except that the magnetic sheet is made 0.25mm thick.

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Abstract

Provided are a magnetic sheet for use in a radio frequency identification (RFID) antenna, an RFID antenna including the magnetic sheet, and a method of manufacturing the magnetic sheet, in which the magnetic sheet includes an amorphous alloy selected from the group consisting of Fe-Si-B, Fe-Si-B-Cu-Nb, Fe-Zr-B and Co-Fe-Si-B. The magnetic sheet is made by laminating amorphous alloy ribbons made of an amorphous alloy between magnetic sheet layers formed of alloy powder including at least one amorphous alloy and then compression-molding the amorphous alloy ribbons, to thereby control microcrackof the amorphous alloy ribbons and enhance characteristic of an end-product. The magnetic sheet is also thin, and has an excellent magnetic permeability, and a simple manufacturing process.

Description

technical field [0001] The invention relates to a magnetic sheet used in a radio frequency identification (RFID) antenna, a manufacturing method thereof and an RFID antenna containing the magnetic sheet. In particular, the present invention relates to a magnetic sheet used in an RFID antenna, a manufacturing method thereof, and an RFID antenna comprising the magnetic sheet, wherein the magnetic sheet has a single-layer structure formed using an alloy powder containing at least one amorphous alloy, or A multi-layer structure formed by lamination or compression molding of amorphous alloy ribbons composed of amorphous alloys between magnetic sheets. Background technique [0002] Recently, radio frequency identification systems (hereinafter referred to as RFID systems) for data communication between a transceiver including an integrated circuit (IC) chip and a reader / writer or between a transceiver and a reader have been widely used. Since the RFID system performs data communic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q7/06H01F1/14H01F1/147H01F1/153H01F1/16H01Q1/27G06K19/07H04B5/02
CPCG06K19/07749H01Q1/2208H01Q7/04H01Q7/06H01Q17/008H04B5/0062H04B5/0081
Inventor 梁宰硕林贤哲李炳璂李龙燮金容玄宋容卨权相均金范镇
Owner AMOTECH
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