Fig. 1. Radiation contribution of each part (a) direct measurement, (b) measurement with measured window

Fig. 2. Military coating material samples are measured in the experiments

Fig. 3. Measurement scenarios (a)the measurement based on voltage method, (b) the measurement based on improved voltage method.

Fig. 4. The comparison of measured results of radar absorbing coating

Fig. 5. Emissivity of high emissivity infrared coating in Ka band

Fig. 6. Emissivity of combination of high emissivity infrared coating and the radar absorbing coating in Ka band

Fig. 7. Emissivity of aviation anticorrosive coating in Ka band

Fig. 8. Emissivity of the combination of low emissivity infrared coating and the radar absorbing coating in Ka band

Fig. 9. Variation of relative uncertainty with ambient brightness temperature （the surface temperature of sample is 290 K）.