Experiment Study The Electromagnetic Wave’s Attenuation And Cross-depolarization By The Charge Of Medium

We rely on the electromagnetic wave technology in modern daily life. As we know that the signal quality of the electromagnetic wave is easily affected by many factors. Charges carried by many materials have a significant effect on the electromagnetic waves. The charge has obvious influence on electromagnetic wave propagation. So, we experimentally investigate the attenuation and the cross-depolarization of electromagnetic waves by the charged PMMA plates and the sand particles and wind sand flux in the wind tunnel.Firstly, we measure the attenuation of the electronic waves scattered by charged PMMA plates and then calculated the cross-depolarization of the electromagnetic waves scattered by the charged PMMA plates. The results showed that when positive charges carried by PMMA plates have bit effect on the attenuation and the depolarization of the electromagnetic waves, while the negative charges carried by PMMA plates have a significant effect on the electromagnetic waves’ attenuation and depolarization. As the negative charges increases, the attenuation and depolarization rise too. Secondly, we investigated the attenuation and the depolarization of electromagnetic waves by sand particles in the self-made instrument and in the wind tunnel. The results show the attenuation and depolarization increase with the ratio of the charges to the mass of the sand particles increasing for the experiments by using the self-made instrument. In the wind tunnel, the attenuation of the electromagnetic waves by the sand flux increases with the sand transport rate and the charge increasing, while the cross-depolarization reaches up to a maximum when the sand transport rate is 0.197g/(min·cm2) and the charges is -0.027 nC/(min-cm2). The depolarization can be neglected when the strong sand transport rate is occurred.