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Antenna device and portable terminal

一种天线装置、天线元件的技术，应用在天线接地装置、天线、谐振天线等方向，能够解决天线性能劣化等问题

Active Publication Date: 2019-12-17
小岛 优
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This antenna device may be attached to a human body or a metal object, so there is a possibility that the performance of the antenna may be degraded due to the influence of the attachment part such as a human body or a metal object.

Method used

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  • Antenna device and portable terminal
  • Antenna device and portable terminal
  • Antenna device and portable terminal

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0126] figure 2 It is a perspective view showing the outline of the antenna device 200 of the first embodiment. The antenna device 200 includes a dielectric substrate 124 in addition to the structure of the antenna device 100 . in, figure 2 The Y axis shown in corresponds to the width direction of each structural element, the Z axis corresponds to the length direction, and the X axis corresponds to the thickness direction. Also, the length direction of the first antenna element 121 corresponds to the Z axis, and the width direction corresponds to the Y axis.

[0127] The antenna unit 120 is formed on the surface of the dielectric substrate 124 . Furthermore, the parasitic element 110 is provided on the back side of the dielectric substrate 124 . The parasitic element 110 may be provided at a distance from the back surface of the dielectric substrate 124 (ie, the surface opposite to the surface on which the antenna unit 120 is provided), or may be provided on the back sur...

no. 2 example

[0136] Figure 5It is a perspective view showing the outline of the antenna device 300 of the second embodiment. The antenna device 300 has the same structure as the antenna device 200 except for a point where L4 = 16 mm (ie, the length L3 of the second antenna element 122 = 15 mm (0.1λ)). In the antenna device 300 , the end of the second antenna element 122 is disposed 7 mm inside the end of the parasitic element 110 in the Z-axis direction.

no. 3 example

[0138] Figure 6 It is a perspective view showing the outline of the antenna device 400 of the third embodiment. The antenna device 400 has the same structure as the antenna device 300 except for a point where L4 = 31 mm (ie, the length L3 of the second antenna element 122 = 30 mm (0.2λ)). In the antenna device 400 , the end of the second antenna element 122 protrudes 8 mm further outward than the end of the parasitic element 110 in the Z-axis direction.

[0139] Figure 7A It is a Smith chart showing the input impedance characteristics of the antenna device 300 and the antenna device 400 . In the case of further impedance matching at a frequency of 2 GHz, a series inductor is provided to the antenna device 300 as a matching circuit, and a series capacitor is provided to the antenna device 400 as a matching circuit.

[0140] Figure 7B It shows the radiation pattern of the XY plane of the antenna device 300 and the antenna device 400 at a frequency of 2 GHz. Figure 7B Th...

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Abstract

Provided is a small wideband antenna device. The antenna device is provided with: an antenna unit having a board-like first antenna element, and a second antenna element having a width that is smallerthan that of the first antenna element; and a board-like parasitic element that is disposed facing the antenna unit. The parasitic element has a length that is substantially equal to or longer than 1 / 2 of the wavelength of a working frequency, the length of the second antenna element is shorter than 1 / 4 of the wavelength of the working frequency, and the antenna unit and the parasitic element aredisposed at an interval with which the antenna unit and the parasitic element can be electromagnetically coupled to each other, said antenna unit and parasitic element resonating at the working frequency.

Description

technical field [0001] The present invention relates to an antenna device and a portable terminal. Background technique [0002] Conventionally, antenna devices have been used in portable terminals having a call function, a data communication function, and the like. Since portable terminals are also used close to the human body, there is a concern that electromagnetic waves may affect the human body. Applied as a safety index is specific absorption rate (SAR, Specific Absorption Rate) which is the amount of electric power absorbed per unit mass. Therefore, as an antenna device, it is preferable to reduce SAR while improving antenna efficiency. From the viewpoint of reducing SAR, in order to reduce electromagnetic waves radiated to the side of the human body, it is effective to orient the directivity of the antenna toward the opposite direction of the human body. In this regard, according to a known device, a plate-shaped parasitic element is arranged opposite to the excit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q9/38H01Q1/48H01Q19/22
CPCH01Q9/0407H01Q9/0414H01Q9/42H01Q1/243H01Q19/10H01Q9/0428H01Q9/045H01Q19/005H01Q19/00H01Q9/04
Inventor 小岛优
Owner 小岛 优