Custom Search
|
|
|
||
 Table 8-12
Effectiveness of Non-Solid Shielding
Materials Against Low Impedance and Plane Waves (8-7)
Nominal Effectiveness
(dB)
Impinging
10
85
1
10
Thickness
0.1
1
Material
Wave
(mils)
kHz
kHz
MHz
General
Detail
kHz
kHz
MHz
Cu
2 layers
18
2
6
(oxidized)
1 inch
Low
apart
Mesh
(Screening)
31
43
43
Cu
No. 22
Bronze
No. 16
18
Galvanized
10
17
21
No.
4
Steel
9380 MHz
45 mil
Perforated
3040 MHz
Al
Sheet
dia.,
20
62
225 sq.
60
Plane
inch
36
dia. = 13
34
Mesh
(Screening)
1 MHz
5 MHz
100 MHz
Cu
dia. = 15
200 kHz
No. 22
106
100
80
118
|
 
|
|
|
||
