JP3041086U - Electromagnetic wave absorbing sheet - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To absorb and reduce unnecessary electromagnetic waves. SOLUTION: An arbitrary number of U-shaped electric conductors 2, 3, 4, 5, 6 and a short-circuit electric conductor 7 are provided on the surface of the electric insulating sheet 1 to form an electric insulating sheet 1a. That is what I covered.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 This invention relates to an electromagnetic wave absorbing sheet that absorbs electromagnetic waves that are unnecessarily radiated.

[0002]

[Prior art]

 Conventionally, an electromagnetic wave radiation blocking sheet made of a metal material and an electromagnetic wave absorbing material made of a ferrite material are often used so as to prevent unnecessary radiation of electromagnetic waves from various electronic devices to the outside. The sheet has a drawback that it scatters unnecessary electromagnetic waves depending on the usage, and the electromagnetic wave absorber of the ferrite material is hard and heavy, and has a drawback that the absorption characteristics are not good depending on the frequency.

[0003]

[Problems to be solved by the device]

 The purpose is to absorb unnecessary electromagnetic waves emitted from electronic devices and not to damage other electronic devices or the human body.

[0004]

[Means for solving the problem]

 Arrange a plurality of U-shaped electrical conductors of arbitrary size on the top surface of an electrically insulating sheet made of synthetic resin with low high-frequency dielectric loss, and short-circuit both ends of each U-shaped electrical conductor opening. A sheet of synthetic resin having electrical insulation and low loss of high-frequency dielectric is provided on the upper surface of the electrical insulating sheet which is connected to the electrical conductor for use and is provided with the U-shaped electrical conductor.

[0005]

[Embodiment of the invention]

 An embodiment of the invention will be described with reference to the drawings. As shown in FIG. 1, the U-shaped electric conductors 2, 3, 4, 5, 6 and the co-electrical conductors 2, 3, 4, Each of the openings 5 and 6 is formed by printing a short-circuiting electric conductor 7 on both ends thereof with a silver coating material, and each of the U-shaped electric conductors 2, 3, 4, The lengths of 5 and 6 are related to the wavelength of the electromagnetic wave desired to be absorbed, and the electromagnetic wave can be absorbed over a wide frequency band.

That is, each of the U-shaped electric conductors 2, 3, 4, 5, 6 has such a length as to resonate at 1 wavelength, 1/2 wavelength, 1/4 wavelength or the like of the electromagnetic wave desired to be absorbed. , And both ends of the openings of the U-shaped electric conductors 2, 3, 4, 5, 6 are connected to the short-circuiting electric conductor 7 so as to be electrically connected. By attenuating the electromagnetic wave resonated by the mechanical conductors 2, 3, 4, 5, 6, etc., unnecessary electromagnetic wave from the electronic device can be absorbed and removed. Also, strong electromagnetic waves that are dangerous to the human body are absorbed, and the danger to human bodies can be eliminated.

FIG. 2 shows a high frequency dielectric for protecting the U-shaped electric conductors 2, 3, 4, 5, 6 and the short-circuit electric conductor 7 printed on the electric insulating sheet 1. An electrically insulating sheet 1a made of a synthetic resin material with little loss is provided on the printed surface of the electric conductors 2, 3, 4, 5, 6 and the electric conductor 7 for short circuit, and glued or stitched. So that you do not leave. Also, by using a synthetic resin material with low high-frequency dielectric loss for the electrically insulating sheets 1 and 1a, the Q value of the U-shaped electrical conductors 2, 3, 4, 5, 6 should be as high as possible. Thereby, the absorption value of electromagnetic waves can be improved.

Further, as shown in FIG. 3, the electromagnetic wave absorbing sheet 10 of the present invention is placed on the electronic device 11 to absorb unnecessary electromagnetic waves emitted from the electronic device 11, thereby affecting other electronic devices. Will not be affected. Since the electromagnetic wave absorbing sheet 10 of the present invention uses the resonance characteristics of the antenna, it can absorb electromagnetic waves in the front-back, left-right, and 360-degree directions regardless of the emission direction of the electromagnetic waves, regardless of the sheet shape. .

[0009]

[Effect of the invention]

 A flat electromagnetic wave absorption sheet can absorb and reduce desired electromagnetic waves.

[Brief description of the drawings]

FIG. 1 is a plan view in which a U-shaped electric conductor and a short-circuiting electric conductor are provided on an upper surface of an electrically insulating sheet.

FIG. 2 is a perspective view in which another electrically insulating sheet is provided on the upper surface of the electrically insulating sheet.

FIG. 3 is a diagram showing a usage example in which the electromagnetic wave absorbing sheet of the present invention is provided on an upper portion of an electronic device.

[Explanation of symbols]

 1, 1a Electrically insulating sheet 2, 3, 4 U-shaped electrical conductor 5, 6 U-shaped electrical conductor 7 Short-circuiting electrical conductor 10 Electromagnetic wave absorption sheet 11 Electronic device

Claims (1)

[Utility model registration claims] 1. A plurality of U-shaped electric conductors (2, 3, 4, 5, 6) of arbitrary size are arranged on the upper surface of an electric insulating sheet (1) made of a synthetic resin material having a small high frequency dielectric loss. , Both ends of the opening of each U-shaped electric conductor (2, 3, 4, 5, 6) are connected to the short-circuiting electric conductor (7) and arranged on the upper surface of the electric insulation sheet (1). The U-shaped electrical conductor (2, 3,
4, 5 and 6) has an electrically insulating sheet (1) made of a synthetic resin material having an electrical insulation property and a small high frequency dielectric loss on the upper surface side.
An electromagnetic wave absorbing sheet obtained by gluing a).