Urethane pyramid radio wave absorber
Japan Shield Enclosure Co., Ltd.
About This Product
■Summary
A radio wave absorber is a material that absorbs radio wave energy by converting it into heat. There are two main types of radio wave absorbers: dielectric loss type and magnetic loss type. The dielectric loss type is a type of radio wave absorber that has existed for a long time, and is made of a foamed resin such as expanded polystyrene impregnated with a conductive material such as carbon.
Dielectric loss types can be roughly divided into radio wave absorbers with pyramid- or wedge-shaped three-dimensional shapes that have good radio wave absorption characteristics over a wide range and are used in anechoic chambers, etc., and radio wave absorbers that have a three-dimensional shape such as pyramid or wedge shapes, and those used in wireless LAN, ETC, RFID, etc. There are sheet-type radio wave absorbers that support specific frequencies or relatively narrow bands.
Pyramid-shaped (wedge-shaped) radio wave absorbers also have various peak heights. Generally, the thickness (height of the peak) is determined by magnetic permeability, permittivity, and the lowest frequency (wavelength) of the radio waves you want to absorb.
When electromagnetic waves propagating through free space enter a radio wave absorber, unless the impedance of the absorber's surface is close to the characteristic impedance of free space (377Ω), reflection will occur on the surface and the radio wave will not be absorbed much. . This surface impedance is a function of magnetic permeability, permittivity and material thickness, and frequency.
In the case of dielectric materials, the magnetic permeability (complex relative magnetic permeability) is 1, so it can be omitted. Calculating this surface impedance shows that the lower the frequency (the longer the wavelength), the more thickness is required (the height of the pyramid becomes higher).
Also, the reason why the waveforms are tapered in the direction of propagation of radio waves, such as pyramid or wedge shapes, is as follows. In order to obtain good radio wave absorption characteristics over a wide band, it is necessary to stack plate-shaped radio wave absorbers with varying concentrations of conductive materials such as carbon so that the concentration gradually increases in the direction of propagation.
However, manufacturing it takes a lot of effort and increases costs. Therefore, a pyramid (wedge) shape is created by creating a radio wave absorber with a single concentration and making it tapered to give it the equivalent effect of a multilayer structure. In addition, scattering effects can be expected with radio wave absorbers that have a three-dimensional geometric shape.
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Product
Urethane pyramid radio wave absorber
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Handling Company
Japan Shield Enclosure Co., Ltd.
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Categories
6 Models of Urethane pyramid radio wave absorber
Items marked with have different values depending on the model number.
Click on the part number for more information about each product
| Product Image | Part Number | Price (excluding tax) | Dimensions (mm) | Elongation rate | Elongation rate measurement method | Hardness | Hardness measurement method | Material | Number of pyramids | Radio wave absorption characteristics for normal incidence 1 (GHz) | Radio wave absorption characteristics for normal incidence 10 (GHz) | Radio wave absorption characteristics for normal incidence 3 (GHz) | Radio wave absorption characteristics for normal incidence 500 (MHz) | Radio wave absorption characteristics for normal incidence 750 (MHz) | Tensile strength | Tensile strength measurement method | Weight (kg) |
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JSE-4 |
Available upon quote | W600 x D600 x H100 | 160% or more | JIS K6301 | 9kgf/314cm2 | JIS K6401 | Polyether type polyurethane foam | 225 | - | 40 [dB] | - | - | - | 1.0kgf/cm2 | JIS K6301 | 0.6 |
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JSE-8 |
Available upon quote | W600 x D600 x H215 | 160% or more | JIS K6301 | 9kgf/314cm2 | JIS K6401 | Polyether type polyurethane foam | 64 | 30 [dB] | 50 [dB] | 40 [dB] | - | - | 1.0kgf/cm2 | JIS K6301 | 1,2 |
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JSE-12 |
Available upon quote | W600 x D600 x H311 | 160% or more | JIS K6301 | 9kgf/314cm2 | JIS K6401 | Polyether type polyurethane foam | 36 | 35 [dB] | 50 [dB] | 40 [dB] | - | 30 [dB] | 1.0kgf/cm2 | JIS K6301 | 1,4 |
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JSE-18 |
Available upon quote | W600 x D600 x H463 | 160% or more | JIS K6301 | 9kgf/314cm2 | JIS K6401 | Polyether type polyurethane foam | 16 | 40 [dB] | 50 [dB] | 45 [dB] | 30 [dB] | 35 [dB] | 1.0kgf/cm2 | JIS K6301 | 2,2 |
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JSE-24 |
Available upon quote | W600 x D600 x H610 | 160% or more | JIS K6301 | 9kgf/314cm2 | JIS K6401 | Polyether type polyurethane foam | 9 | 45 [dB] | 50 [dB] | 50 [dB] | 35 [dB] | 40 [dB] | 1.0kgf/cm2 | JIS K6301 | 2,6 |
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JSE-36 |
Available upon quote | W600 x D600 x H914 | 160% or more | JIS K6301 | 9kgf/314cm2 | JIS K6401 | Polyether type polyurethane foam | 4 | 45 [dB] | 50 [dB] | 50 [dB] | 40 [dB] | 40 [dB] | 1.0kgf/cm2 | JIS K6301 | 4,0 |
Click on the part number for more information about each product
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