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Various Electromagnetic Protective Clothing
Human Exposure Protection Test Data
The MG Military Suit was subjected to radiated emission testing and its human exposure protection performance was evaluated using the following procedure. The electromagnetic wave shielding material "MG Net" used in the MG Military Suit is double-layered (shielding performance 32-40dB), and reduces the electric field strength almost uniformly inside the human body.※If the shielding performance is too high (60dB or more), the effects of reflection and resonance will become greater, amplifying electromagnetic waves inside the human body and causing hot spots.
- １ The bilog antenna that irradiates electromagnetic waves was installed 0.45 m away from the center of the back of the human body phantom in the vertical direction and 0.9 m away from the center of the back of the human body phantom in the horizontal direction to the right, and irradiated horizontally and vertically polarized waves.
- ２ Receiving probes were placed on the head and chest of the human body phantom, and the electric field strength was measured in the frequency range of 270 MHz to 925 MHz.
- ３ Receiving probes were placed on the head and chest of the human-body phantom, and the electric field strength was measured in the frequency range of 270 MHz to 925 MHz while the phantom was wearing an "MG military suit."
- ４ The above measurement results confirmed the electromagnetic protective performance of the "MG Military Suit."
MG Military Suit Radiated Emissions Test
| Date and Time | March 19, 2020 10:00～17:00 |
|---|---|
| place | Osaka Prefectural Technology Research Institute: Radio Wave Anechoic Chamber |
| the purpose | The electromagnetic field strength in space and the electromagnetic field strength inside a body-shaped phantom when the "MG Military Suit" was worn by a body-shaped phantom were measured and compared to evaluate the performance of the "MG Military Suit." |
Table 1 Test frequencies
Exam number |
Frequency (MHz) |
１ |
270 |
２ |
420 |
３ |
500 |
４ |
790 |
５ |
925 |
Table 2. Specifications of the equipment used in the test
Device name |
Manufacturer |
Model |
Identification number |
Main characteristics |
Electromagnetic field sensor (main unit) |
NARDA |
NBM-520 |
C-0130 |
Frequency range: 100 kHz to 3 GHz Measurement range：185 mV/m~300 V/m |
Electromagnetic field sensor (probe) |
NARDA |
EF0391 |
A-0823 |
|
Signal Generator |
Rohde & Schwarz |
SMB100A |
105731 |
Frequency range：9 kHz~3.2 GHz |
amplifier |
PRANA |
MT200 |
1176 |
Frequency range：80 MHz~1 GHz Maximum power：200 W |
Transmitting Antenna |
Schwarzbeck |
VULP9118D |
9118D631 |
Frequency range：95 MHz~1.5 GHz |
Table 3. Measurement values when the electromagnetic field sensor was placed on the right temple
Transmitting antenna polarization plane |
Horizontal polarization |
|||||
Electric/magnetic fields |
electric field（V/m） |
magnetic field（A/m） |
||||
frequency（MHｚ） |
No protective clothing |
Protective clothing available |
Decay Rate(%) |
No protective clothing |
Protective clothing available |
Decay Rate(%) |
270 |
57.5 |
7.79 |
86.4 |
0.151 |
0.0207 |
86.3 |
420 |
67.8 |
4.74 |
93.0 |
0.180 |
0.0127 |
92.9 |
500 |
51.9 |
15.9 |
69.4 |
0.137 |
0.0422 |
69.3 |
790 |
56.8 |
13.2 |
76.7 |
0.150 |
0.0350 |
76.7 |
925 |
71.3 |
16.9 |
76.3 |
0.189 |
0.0443 |
76.6 |
Transmitting antenna polarization plane |
Vertical polarization |
|||||
Electric/magnetic fields |
electric field（V/m） |
magnetic field（A/m） |
||||
frequency（MHｚ） |
No protective clothing |
Protective clothing available |
Decay Rate(%) |
No protective clothing | Protective clothing available
Protective clothing available |
Decay Rate(%) |
270 |
33.0 |
5.27 |
84.0 |
0.0875 |
0.0139 |
84.2 |
420 |
25.6 |
10.9 |
57.6 |
0.0679 |
0.0289 |
57.5 |
500 |
27.3 |
9.00 |
67.0 |
0.0721 |
0.0240 |
66.8 |
790 |
30.8 |
10.0 |
67.6 |
0.0816 |
0.0265 |
67.6 |
925 |
43.6 |
6.37 |
85.4 |
0.115 |
0.0169 |
85.3 |
Table 4. Measurements when the electromagnetic field sensor is placed on the dovetail
Transmitting antenna polarization plane |
Horizontal polarization |
|||||
Electric/magnetic fields |
electric field（V/m） |
magnetic field（A/m） |
||||
frequency（MHｚ） |
No protective clothing |
Protective clothing available |
Decay Rate(%) |
No protective clothing |
Protective clothing available |
Decay Rate(%) |
270 |
127 |
11.3 |
91.1 |
0.333 |
0.0296 |
91.1 |
420 |
93.0 |
13.8 |
85.2 |
0.246 |
0.0358 |
85.5 |
500 |
58.6 |
5.11 |
91.3 |
0.155 |
0.0136 |
91.3 |
790 |
51.9 |
12.8 |
75.4 |
0.138 |
0.0337 |
75.6 |
925 |
55.3 |
13.8 |
75.1 |
0.147 |
0.0369 |
74.9 |
Transmitting antenna polarization plane |
Vertical polarization |
|||||
Electric/magnetic fields |
electric field（V/m） |
magnetic field（A/m） |
||||
frequency（MHｚ） |
No protective clothing |
Protective clothing available |
Decay Rate(%) |
No protective clothing |
Protective clothing available |
Decay Rate(%) |
270 |
36.3 |
6.70 |
81.6 |
0.0965 |
0.0176 |
81.7 |
420 |
11.0 |
6.12 |
44.1 |
0.0290 |
0.0164 |
43.5 |
500 |
14.0 |
7.45 |
46.7 |
0.0370 |
0.0199 |
46.3 |
790 |
21.2 |
7.52 |
64.5 |
0.0561 |
0.0200 |
64.3 |
925 |
26.5 |
9.64 |
63.6 |
0.0701 |
0.0255 |
63.6 |
Table 5. Measurement values when the electromagnetic field sensor was placed on the back of the head
Transmitting antenna polarization plane |
Horizontal polarization |
|||||
Electric/magnetic fields |
electric field（V/m） |
magnetic field（A/m） |
||||
frequency（MHｚ） |
No protective clothing |
Protective clothing available |
Decay Rate(%) |
No protective clothing |
Protective clothing available |
Decay Rate(%) |
270 |
29.8 |
2.24 |
92.5 |
0.0782 |
0.00585 |
92.5 |
420 |
32.1 |
2.65 |
91.8 |
0.0852 |
0.00694 |
91.9 |
500 |
29.3 |
5.12 |
82.5 |
0.0779 |
0.0139 |
82.2 |
790 |
25.9 |
3.66 |
85.9 |
0.0687 |
0.00965 |
86.0 |
925 |
44.4 |
9.61 |
78.4 |
0.118 |
0.0248 |
79.0 |
Transmitting antenna polarization plane |
Vertical polarization |
|||||
Electric/magnetic fields |
electric field（V/m） |
magnetic field（A/m） |
||||
frequency（MHｚ） |
No protective clothing |
Protective clothing available |
Decay Rate(%) |
No protective clothing |
Protective clothing available |
Decay Rate |
270 |
31.2 |
0.738 |
97.6 |
0.0828 |
0.00198 |
97.6 |
420 |
36.1 |
1.37 |
96.2 |
0.0958 |
0.00364 |
96.2 |
500 |
37.5 |
2.22 |
94.1 |
0.0993 |
0.00591 |
94.0 |
790 |
44.9 |
3.74 |
91.7 |
0.119 |
0.00995 |
91.6 |
925 |
62.0 |
2.67 |
95.7 |
0.164 |
0.00715 |
95.6 |
Table 6. Measurement values when the electromagnetic field sensor was placed in the center of the back
Transmitting antenna polarization plane |
Horizontal polarization |
|||||
Electric/magnetic fields |
electric field（V/m） |
magnetic field（A/m） |
||||
frequency（MHｚ） |
No protective clothing |
Protective clothing available |
Decay Ratev(%) |
No protective clothing |
Protective clothing available |
Decay Rate(%) |
270 |
60.1 |
1.99 |
96.7 |
0.158 |
0.00545 |
96.5 |
420 |
57.8 |
1.95 |
96.6 |
0.153 |
0.00525 |
96.6 |
500 |
65.3 |
8.35 |
87.2 |
0.174 |
0.0227 |
86.9 |
790 |
56.8 |
6.56 |
88.4 |
0.151 |
0.0179 |
88.1 |
925 |
69.5 |
11.5 |
83.5 |
0.185 |
0.0306 |
83.5 |
Transmitting antenna polarization plane |
Vertical polarization |
|||||
Electric/magnetic fields |
electric field（V/m） |
magnetic field（A/m） |
||||
frequency（MHｚ） |
No protective clothing |
Protective clothing available |
Decay Rate(%) |
No protective clothing |
Protective clothing available |
Decay Rate(%) |
270 |
24.0 |
3.62 |
84.9 |
0.0637 |
0.00946 |
85.2 |
420 |
27.2 |
3.71 |
86.4 |
0.0723 |
0.00965 |
86.7 |
500 |
28.5 |
3.25 |
88.6 |
0.0755 |
0.00847 |
88.8 |
790 |
39.5 |
2.97 |
92.5 |
0.105 |
0.00778 |
92.6 |
925 |
30.1 |
4.15 |
86.2 |
0.0797 |
0.0106 |
86.7 |