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Magnetic material antenna and antenna device

A technology of magnetic body and magnetic body core, which is applied in the direction of antenna, loop antenna with ferromagnetic material core, antenna parts, etc., which can solve the problems of short distance, small number of coil windings, and decreased antenna sensitivity

Active Publication Date: 2010-11-24
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] But when figure 1 In the structure shown, since the coil conductor formed on the bent portion of the flexible substrate is close to the end surface of the magnetic core, the self-inductance tends to be excessive due to the influence of closed magnetic flux in the vicinity of the coil conductor.
Therefore, when the antenna is realized under the constraints of a certain self-inductance value, there is a problem that the number of winding coils is small, and the sensitivity of the antenna decreases.
In addition, since a part of the coil conductor blocks a part of the magnetic flux passing surface of the magnetic body, the opening of the antenna becomes smaller, so there is a problem that the communication distance is short

Method used

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  • Magnetic material antenna and antenna device

Examples

Experimental program
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Effect test

no. 1 Embodiment approach

[0069] figure 2 It is a figure which shows the structure of the magnetic substance antenna in 1st Embodiment, (A) is a perspective view of the magnetic substance antenna 101, (B) is its side view, (C) is the development of the flexible substrate used for this magnetic substance antenna floor plan.

[0070] Such as figure 2 As shown in (A) and (B), the magnetic antenna 101 has the flexible substrate 23 on which the coil conductor 24 is formed, and the magnetic core 22 . A spiral coil conductor (electrode) 24 is formed on the flexible substrate 23 , and a winding center portion of the coil conductor 24 is formed as a conductor opening CW. That is, the helical coil conductor 24 is formed so as to surround the conductor opening CW.

[0071] figure 2 The two-dot chain line in (C) indicates the bending position of the flexible substrate 23 . Such as figure 2 (A) As shown in (B), the flexible substrate 23 is bent along the two-dot chain line with respect to the magnetic cor...

no. 2 Embodiment approach

[0083] Figure 4 It is a figure which shows the structure of the magnetic substance antenna in 2nd Embodiment, (A) is its perspective view, (B) is its three-sided view. The magnetic antenna 102 is as Figure 4 As shown in (A), the end surface of the magnetic core 22 is arranged in a state facing the curved portion of the flexible substrate 23, and the coil conductor portion CC facing the curved portion of the flexible substrate 23 is located among the end surfaces of the magnetic core 22. The tapered notch-shaped portions 22c and 22d are formed toward the conductor opening CW.

[0084] In this way, by making the notch-shaped portion face the conductor opening CW, and having a tapered shape with a tapered tip, the magnetic flux is concentrated at the tapered portion and concentrated in the opening of the coil conductor, so that the magnetic flux is easy to pass through, that is, the magnetic flux is collected. As the efficiency increases, the sensitivity of the antenna furthe...

no. 3 Embodiment approach

[0086] Figure 5 It is a figure which shows the structure of the magnetic substance antenna in 3rd Embodiment, (A) is this magnetic substance antenna 103 perspective view, (B) is this flexible board|substrate 23 used for this magnetic substance antenna 103 development plan view.

[0087] This magnetic antenna 103 has a flexible substrate 23 forming a coil conductor 23 and a magnetic core 22. The flexible substrate 23 forms a spiral coil conductor 24 with the winding center portion as a conductor opening CW, and is positioned at the center of the conductor opening CW. A hole 23W is formed.

[0088] On the other hand, the magnetic core 22 is arranged in a state where the protruding portion 22 e passes through the hole 23W formed in the bent portion of the flexible substrate 23 . In addition, notch-shaped parts 22 a and 22 b separated from the coil conductor part CC are formed in the part of the coil conductor part CC facing the bent part of the flexible substrate 23 .

[0089]...

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Abstract

On a flexible substrate (23), a spiral coil conductor (24) having the winding center section as a conductor opening section (CW) is formed. The flexible substrate (23) is bent in U-shape to surround a magnetic material core (22) along a line passing the conductor opening section (CW). The magnetic material core (22) is arranged with its end surface facing the bent section of the flexible substrate (23). On the end surface, at a portion facing a coil conductor section (CC) of the bent section of the flexible substrate (23), notched sections (22a, 22b) separated from the coil conductor section (CC) are arranged. Thus, the required number of windings is ensured, and radiation efficiency of a magnetic flux is improved by widening an opening of an antenna close to the magnetic flux transmitting surface of the magnetic material core.

Description

technical field [0001] The present invention relates to a magnetic antenna and an antenna device used in an RFID (Radio Frequency Identification) system or the like that communicates with external devices via electromagnetic signals. Background technique [0002] In recent years, in the RFID system whose application range has been expanded, portable electronic devices such as mobile phones and readers / writers (readers / writers) are each equipped with antennas for information communication to perform data communication with each other. Among them, antennas mounted on portable electronic devices are particularly required to be high-performance, low-cost, and miniaturized. Patent Document 1 discloses a magnetic antenna having a magnetic core as an antenna that achieves these requirements. [0003] figure 1 It is a perspective view of the magnetic substance antenna shown in patent document 1. This antenna 10 has: a magnetic core member (magnetic core) 12; and a single electrica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q7/02G06K19/07G06K19/077H01Q7/06
CPCG06K7/10316G06K7/10336H01Q1/2225H01Q7/06
Inventor 小林英一泽谷琢磨久保浩行
Owner MURATA MFG CO LTD
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