Antenna device

An antenna device and antenna technology, applied in antennas, loop antennas, antenna parts, etc., can solve the problems of difficult magnetic flux to pass through, magnetic flux difficult to enter, and small proportion of magnetic bodies, so as to improve communication performance and reduce magnetic energy loss Effect

Active Publication Date: 2013-03-13
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] exist image 3 In the antenna shown, the image 3 In the part where the magnetic flux shown by the coil conductor part A1 passes, because there is no magnetic substance, it is difficult for the magnetic flux to pass through. In addition, since the proportion of the magnetic substance in the opening surface is small, there is a magnetic flux that is difficult to enter. The problem
[0016] exist Figure 4 In the antenna shown, the image 3 In the part where the magnetic flux passes through the coil conductor parts A1 and A2, it is difficult to pass the magnetic flux because there is no magnetic substance. In addition, since the ratio of the magnetic substance to the opening surface is small, there is a magnetic flux. inaccessibility problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach 》

[0057] Figure 5 It is a three-dimensional view of the antenna device concerning 1st Embodiment. This antenna device is composed of a magnetic antenna 51 and a conductive plate 40 . The magnetic antenna 51 is composed of the flexible substrate 10 and the magnetic core 20 . In the flexible substrate 10 , a helical coil conductor 12 having a winding center as a conductor opening CW is formed on the base material 11 .

[0058] The dimension L (lengthwise dimension of the conductor plate 40 ) of the magnetic core 20 is shorter than that of the flexible substrate 10 . The magnetic core 20 is arranged at a position close to the first end side S1 of the conductor plate 40 and at a position not covering the coil conductor portion A3 located farthest from the first end side S1. With this structure, the following effects can be obtained.

[0059] and figure 2 Unlike the antenna device shown, the energy loss in the passing magnetic core 20 is reduced after the magnetic flux takes a...

no. 2 Embodiment approach 》

[0068] In the first embodiment, how to determine the arrangement position of the magnetic core 20 with respect to the flexible substrate 10 with respect to the longitudinal direction of the conductor plate 40 was described. In the second embodiment, it will be described how the portion of the magnetic core 20 that is close to the third end side or the fourth end side perpendicular to the first and second end sides of the conductor plate 40 becomes by using the same phenomenon as above. shape.

[0069] Figure 7 (A) is a plan view of the magnetic antenna 52 used in the antenna device according to the second embodiment. Figure 7 (B) is its bottom view. The magnetic antenna 52 is composed of the flexible substrate 10 and the magnetic core 20 . In the flexible substrate 10 , a helical coil conductor 12 having a winding center portion as a conductor opening CW is formed on a rectangular base material 11 .

[0070] exist Figure 7 Only the magnetic antenna 52 is shown. Howeve...

no. 3 Embodiment approach 》

[0080] Figure 12 It is a diagram showing the structure of the magnetic antenna 54 used in the antenna device according to the third embodiment, Figure 12 (A) is a top view of the magnetic antenna 54, Figure 12 (B) is its bottom view. The magnetic body antenna 54 and Figure 5 The antenna device shown is similarly arranged near one end of the conductor plate 40 .

[0081] and used in the second embodiment Figure 7 The illustrated magnetic antenna 52 differs in the shape of the magnetic core 20 . Figure 12 The magnetic body core 20 of the shown magnetic body antenna 54 is provided so that the magnetic body core 20 does not cover the coil conductor portion A1 adjacent to the end side perpendicular to the first end side S1 and the second end side S2 of the conductor plate 40. a part of.

[0082] Figure 13 It is a diagram showing the configuration of another magnetic antenna 55 used in the antenna device according to the third embodiment, Figure 13 (A) is a top view ...

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Abstract

An antenna device comprises a magnetic antenna 51 including a flexible substrate 10 with a spiral conductive coil 12 formed on a base 11. A magnetic core 20 is disposed on or close to the substrate 10 and a conductor plate 40 is disposed close to the magnetic antenna 51 and the magnetic core 20 is disposed so as not to cover a portion A3 of the coil conductor 12. The magnetic core 20 is located adjacent a first edge S1 of the conductor plate 40 with a length and width such that it covers the central opening CW of the coil 12 and at least a portion of the coil 12 in region A2. The core 20 may also cover one or more portions of regions Al. The coil 12 and core 20 may be located at a certain position and arranged at certain distances relative to the four edges of the conductive plate 40. The coil region A3, which is not covered by the magnetic core 20, may be located at a distance approximately equal to or greater than 0.4 times the length of the conductive plate 40 from the second edge S2. The antenna device aims to be capable of being strongly magnetically coupled with an antenna of a communication partner whilst having a high communication performance.

Description

technical field [0001] The present invention relates to an antenna device used in an RFID (Radio Frequency Identification) system or the like that communicates with external devices through electromagnetic field signals. Background technique [0002] In recent years, in an RFID system that has been increasingly used, an antenna for information communication is installed on each of portable electronic devices such as mobile phones and a reader recorder, and data is exchanged with each other. As such antenna devices for RFID, Patent Documents 1 to 3 disclose magnetic antennas including a magnetic core. [0003] Here, referring to each figure, it will be described how each antenna of Patent Documents 1 to 3 is incorporated in a portable electronic device. [0004] figure 1 It is a three-dimensional view showing the state where the antenna of patent document 1 is built into a portable electronic device. The magnetic antenna 31 is configured by providing a sheet-shaped or flat...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H01Q7/06H01Q1/38
CPCG06K19/07749H01Q7/00H01Q1/2225H01Q1/2208H01Q1/38H01Q7/06
Inventor伊藤宏充久保浩行用水邦明
OwnerMURATA MFG CO LTD