射频特性
Reflectivity : capability of absorbers to lower the level of reflected EM waves.
反射性能：吸波材料降低反射电磁波的能力
Reflectivity = (Reflected power) / (Forward power) (dB)
反射性能 = 反射功率/ 前向功率
Values < 0
RF properties
射频特性
Range of frequencies : 30 MHz – 40 GHz (50 GHz)
频率范围：30 MHz – 40 GHz (50 GHz)
Two different setups 两种不同的测试方法
A test setup to characterize the absorbers
from 30 MHz to 1 GHz
Coaxial line
30 MHz to 1 GHz的频率使用同轴线测试法
2nd procedure : test the absorbers performances to microwaves 1 GHz to 40 GHz (50 GHz)
Full-anechoic chamber with NRL Arch method
1GHz 到 40GHz 使用全电波暗室测试法
