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Electromagnetic filter and electronic device having said filter

A technology of electromagnetic filters and electronic equipment, applied in the direction of electromagnetic wave systems, circuits, electrical components, etc., can solve problems such as adverse effects, and achieve the effect of suppressing leakage

Inactive Publication Date: 2011-09-07
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Meanwhile, in order to avoid adverse effects on peripheral devices, electromagnetic noise radiated from electronic devices is limited to have a level equal to or less than a certain value

Method used

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  • Electromagnetic filter and electronic device having said filter
  • Electromagnetic filter and electronic device having said filter
  • Electromagnetic filter and electronic device having said filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] An electromagnetic filter in Embodiment 1 according to the present invention will be described. First refer to Figure 1A . Figure 1A is an isometric view of an electronic device on which an electromagnetic filter is mounted according to the present embodiment.

[0039] Figure 1A The illustrated electronic device includes: an antenna 105 for transmitting or receiving radio frequency electric power; a shield conductor 101 for enclosing the antenna 105 and electrical components not shown; and an electromagnetic filter 103 attached to the opening of the shield conductor 101 (shield opening 102). Actually, the electronic device includes various electronic components provided therein in addition to the antenna 105, but these other elements generally included in the electronic device are not shown for the sake of simplicity. In the drawing, the shield conductor 101 has the shape of a rectangular (including square) parallelepiped, but is actually not limited to having th...

Embodiment 2

[0086] now refer to Figure 8 , to describe Embodiment 2 of the present invention. Figure 8 is a cross-sectional view showing the structure of an electronic device including an electromagnetic filter in this embodiment.

[0087] In the electromagnetic equipment in this embodiment, such as Figure 8 As shown, the conductive strip 11 and the bandstop filter 113 are formed on the -Y surface of the dielectric substrate 109 (ie, inside the shielding arrangement). In this example, in order to electrically connect the conductive tape 111 and the shield conductor 101 to each other, a plurality of via-hole conductors are provided at specified intervals along the inner periphery of the ground conductor 110 to penetrate at various positions in the ground conductor 110. dielectric substrate 109 . exist Figure 8 In , via-hole conductors 107a and 107b are shown (hereinafter collectively indicated by reference numeral "107"). One end of each via conductor 107 is electrically connected t...

Embodiment 3

[0089] now refer to Figure 9 , to describe Embodiment 3 of the present invention. Figure 9 is a cross-sectional view showing the structure of the electromagnetic filter in this embodiment.

[0090] In this embodiment, the conductive strips 111 a to 111 c extend along the Z-axis direction to electrically connect the two sides 110 b and 110 d facing each other in the ground conductor 110 . The conductive strips 111a to 111c are arranged at prescribed intervals in the X-axis direction. Accordingly, the conductive strips 111 a to 111 c divide the shield opening 102 into a plurality of divided openings 112 . Correspondingly, the length Xap of each dividing opening 112 along the X-axis direction is made smaller than the length Xsc of the shielding opening 102 along the X-axis direction. Therefore, a shielding effect can be exhibited against electromagnetic noise.

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PUM

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Abstract

The electromagnetic filter according to the present invention includes a shield opening 102 provided in a shield conductor 101, a plurality of conductive strips 111 connected to the shield conductor 101 at both of two ends for dividing the shield conductor 101 into a plurality of divided openings 112, and a plurality of band-stop filters 113 located on each of the conductive strips 111 at a prescribed interval. By dividing the shield opening 102 into the plurality of divided openings 112, the amount of noise leaking via the shield opening 102 can be suppressed. Each of the band-stop filters 113 prevents a flow of an electric current of a prescribed frequency in each of the conductive strips 111, which would otherwise be caused by a magnetic field of the prescribed frequency passing the shield opening 102, and thus the wireless electric power transmission characteristic which uses coupling of magnetic fields of the prescribed frequency can be prevented from being deteriorated.

Description

technical field [0001] The present invention relates to an electromagnetic filter preferably mountable on an electronic device for transmitting electric power with an external device in a non-contact state; and an electronic device having such an electromagnetic filter. Background technique [0002] For many years, attempts have been made to provide an electronic device with a wireless communication function. In the case where the wireless communication interface is built into the housing of the electronic device, in the part of the electronic device where the antenna is to be built, it is necessary to remove the conductive shielding configuration. The reason is that electromagnetic energy having an operating frequency fp used in a wireless system needs to pass through an enclosure with an electromagnetic shielding function. Meanwhile, in order to avoid adverse effects on peripheral devices, electromagnetic noise radiated from electronic devices is restricted to have a leve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/38H01Q1/42H01Q1/52H01Q15/00H05K9/00H02J17/00
CPCH01Q1/425H02J5/005H01Q1/38H01Q1/526H01Q15/0006H01Q15/0086H02J50/12H02J50/70H02J50/005
Inventor 菅野浩
Owner PANASONIC CORP
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