微波暗箱反射率电平分析与测量
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无回波吸收室的出现 满足了这类工程研究的需要。这类无回波吸收室是指用无线电波吸收材料构成内壁的房间。利用这种特殊的墙壁使得入射的电磁波被最大限度的吸收,最小限度的反射,并且在室内的某一部分空间能构成一个接近"自由空间条件"的无回波区域。
移动距离(mm)
|
仰角+20°时电平的变化(dB)
|
俯角-20°时电平的变化(dB)
|
0
|
61.09
|
61.24
|
2
|
61.08
|
61.22
|
4
|
61.08
|
61.17
|
6
|
61.04
|
61.17
|
8
|
60.98
|
61.12
|
10
|
60.96
|
61.08
|
12
|
60.95
|
61.06
|
14
|
60.91
|
61.04
|
16
|
60.96
|
61.03
|
18
|
60.97
|
61.03
|
20
|
60.97
|
61.03
|
22
|
61.00
|
61.04
|
24
|
61.00
|
61.10
|
26
|
60.98
|
61.15
|
28
|
60.99
|
61.17
|
30
|
60.96
|
61.19
|
32
|
60.94
|
61.28
|
34
|
60.89
|
61.37
|
36
|
60.88
|
61.31
|
38
|
60.86
|
61.42
|
40
|
60.86
|
61.47
|
42
|
60.83
|
61.53
|
46
|
60.80
|
61.58
|
48
|
60.74
|
61.63
|
50
|
60.71
|
61.65
|
52
|
60.66
|
61.72
|
54
|
60.90
|
61.74
|
56
|
60.89
|
61.74
|
58
|
60.79
|
61.74
|
60
|
60.46
|
61.69
|
62
|
60.45
|
61.67
|
64
|
60.73
|
61.63
|
66
|
60.72
|
61.58
|
方位角
|
+20°
|
-20°
|
方向图电平值A(dB)
|
10
|
10
|
最大电平变化值Δ(dB)
|
0.64
|
0.62
|
总的反射率电平值R(dB)
|
-38.7
|
-39.0
|