Multipath effects in semi-anechoic chambers at low frequencies: a simplified prediction model based on image theory

The multipath effects due to radiating sources inside a shielded room can not be neglected when the frequency of the harmonic components of the electromagnetic field are below the frequency threshold of the absorber lined walls. This paper deals with the prediction of the total radiated field by an electric dipole source inside a shielded room, taking into account the wall reflections. The model is based on an extension of the method of images to radiating sources in rectangular cavities. The prediction model is validated by comparing the results with those analytically obtained by the complex potential theory and with those obtained by measurements.