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Medical Devices and Hygiene Products
Electromagnetic Shielding Materials
For EMC measuresMGnet
Japan Patent No. 392205 / U.S. Patent No. US6.855.883.B1
Reflects high frequency electromagnetic waves
ＭＧ(Microwave Guard)net
- ・Blocks high frequency electromagnetic waves (100kHz to several tens of GHz)
- ・Anti-static (static)
- ・High durability (resistant to bending and friction)
- ・High light transmittance, breathability, and heat dissipation
- ・Ultra-lightweight（20g／㎡）
- ・Conductive rust prevention processing (performance maintained for more than 2 years)
- ・Long fibers reduce the production of fluff and dust
- ・Won't fray even when cut
- 1.MGnet 2 layers
- 2.High frequency electromagnetic waves
- 3.Electromagnetic wave reflection
It is a material made by weaving silver fiber (nylon coated with 99.9% pure silver) into a special honeycomb mesh (mesh size of about 1 mm), and combines the properties of nylon fiber (lightweight and flexible), silver (conductivity, electromagnetic shielding, antibacterial properties), and honeycomb mesh (durability, translucency, ventilation and heat dissipation). In addition, it is treated with conductive rust prevention to prevent deterioration of the silver fiber.
Electromagnetic Shielding Test
KEC method electric field shielding data
This is the electric field shielding data (in dB: decibels) when 1 to 4 sheets of MGnet are stacked for each frequency.
There is a shielding performance of ※99% at 40dB and 99.9% at 60dB. If you want to completely block your mobile phone from reception, you need a shielding performance of 40dB or more, so please use MGnet 3 or more times.
Comparison of shielding performance against near-field electric fields by overlapping MGnets (KEC method): Measurement Limit indicates the measurement limit value. It can be seen that overlapping MGnets improves shielding performance against high-frequency electromagnetic waves from 1 MHz to 2.5 GHz from 20 dB to 60 dB.
KEC method for measuring electric field shielding
Comparison of electromagnetic shielding performance by overlapping MGnets
A comparison was made of the electromagnetic shielding performance of overlapping MGnets. The shielding performance against near electric fields was measured using the KEC method as shown on the right. The results are shown in the table and graph above. These results show that overlapping MGnets improves shielding performance against high frequency electromagnetic waves from 1MHz to 2.5GHz.
Measurement method for shielding effectiveness against near electric fields using the KEC method (Figure 1)
▲（図1）
Free space method electric field shielding data
This is the electric field shielding data (in dB: decibels) when 1 to 6 MGnet sheets are stacked for each frequency.
Shielding performance evaluations of MGnet in each frequency band were carried out by HVS Technologies, Inc. (a specialist insti- tutional for electromagnetic absorbing shielding materials and test equipment attached to the Electro-Acoustic Research Center) in the US. As a result, electromagnetic shielding performance was confirmed with a shielding rate of 30-40 dB or more at frequencies between 0.045 GHz and 1.4 GHz, and a shielding rate of 20-40 dB or more at frequencies between 7.75 GHz and 13.0 GHz. Details are shown in Table 2.
▼Table 2 Shielding performance evaluation for each frequency band of MGnet
| Test Date | December 10, 1997 |
|---|---|
| Measurement Facility | HVS Technologies, Inc.（Electromagnetic Absorption Shielding Materials and Testing Equipment Specialty Center of the Electroacoustic Research Center, USA） |
| Measurer | Prof. Vijay K. Varadan（Center for Electroacoustic Materials and Device Engineering, Pennsylvania State University, USA） |
| Electromagnetic wave shielding material used | MGnet |
| Measuring Equipment | HVS Free Space Microwave Measurement System |
| How to Measure | Measurement of electromagnetic wave absorption rate and transmission attenuation rate of MGnet using HVS Free Space Microwave Measurement System |
| Measurement results |
|
Millimeter wave shielding test data ※Click to enlarge
