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Antenna device

An antenna device and antenna element technology, which is applied in the direction of antenna, antenna array, radiation element structure, etc., can solve the problems of communication failure and communication quality degradation, and achieve the effect of reducing communication quality and expanding the possible range of communication

Inactive Publication Date: 2016-07-06
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the cover of the mobile phone is tilted relative to the reader / writer, the antenna will also be inclined relative to the reader / writer, so there will be a problem that the communication quality will be greatly reduced or communication will not be possible.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] Perform coupling simulations of antenna assemblies. The antenna device is mounted on the printed wiring board, and a ground electrode is formed on the entire surface (rear surface) opposite to the mounting surface. The printed circuit board is set at an angle of 45° relative to the reader / writer.

[0104] Figure 14 It is a schematic diagram which shows the magnetic field intensity distribution, (a) shows a comparative example, and (b) shows an example. In addition, the antenna device of the comparative example is an antenna device composed of only the planar helical antenna element 2 .

[0105] according to Figure 14 Obviously, it can be understood that the magnetic field intensity of the antenna device represented by the embodiment is stronger in a wider range than that of the comparative example, and can provide a stronger magnetic field than the reader / writer.

Embodiment 2

[0107] Figure 15 It is a graph showing the coupling loss when the positional relationship between the planar helical antenna element 2 and the solenoid antenna element 4 is slightly shifted. Here, (a) and (e) are comparative examples, and are schematic diagrams showing characteristics of an antenna device composed of only the planar helical antenna element 2 . (b) and (f) are schematic diagrams showing characteristics when the planar positions of the planar helical antenna element 2 and the solenoid antenna element 4 do not deviate, and both values ​​are the same.

[0108] (c) and (d) are schematic diagrams showing characteristics when the planar position of the solenoid antenna element 4 is shifted downward compared to the case of (b). In addition, (g) and (h) are schematic diagrams showing characteristics when the planar position of the planar helical antenna element 2 is shifted downward compared to the case of (f).

[0109] like Figure 15 As shown, the coupling loss o...

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PUM

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Abstract

It is an object of the present invention to provide an antenna device that has a wide range of possible communication and can maintain a certain communication quality even when the antenna is covered obliquely with respect to the reader / writer. An antenna device (10) includes a substrate (3) made of a magnetic substrate, a solenoid antenna element (4) wound in a loop shape via one main surface and the other main surface of the substrate (3) alternately, A planar helical antenna element (2) arranged overlappingly above the solenoid antenna element (4). The solenoid antenna element (4) has a rotation center axis in a first direction, and the planar helical antenna element (2) has a rotation center axis in a second direction perpendicular to the first direction. A pair of terminals (4a, 4b) of a solenoid antenna element (4) is connected to a pair of terminals (2a, 2b) of a planar helical antenna element (2).

Description

technical field [0001] The present invention relates to antenna devices, and more particularly to the construction of thin antennas used for short-range wireless communication. Background technique [0002] Recently, the spread of mobile phones equipped with a short-range radio communication function called NFC (Near Field Communication) is rapidly increasing. Regarding data communication via NFC, the user brings the mobile phone close to the reader. When the antenna on the mobile phone side receives a signal from the reader / writer, the IC connected to the antenna operates due to the induced electromotive force, and data communication between the mobile phone and the reader / writer starts. According to NFC, electronic authentication, electronic settlement, and other data communication can be easily and quickly performed. [0003] A dedicated antenna is built into a mobile phone equipped with an NFC function. An example of this is the planar spiral antenna. However, since ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q1/36H01Q21/00
Inventor 松浦利典佐藤由智
Owner TDK CORPARATION