The adjustable character of microwave transmittance in ER fluid

According to the experimental facts that the structure and the dielectric p roperty of electro-rheology (ER) fluid change under the external electric f ield, a model of microwave transmittance in ER fluid was established, and t he formula of transmittance was given also. Theoretical simulation shows th at the transmittance of microwave increases with increasing electric field, if the dielectric constant of ER fluid is greater than that of its contain er. On the contrary, it decreases with the electric field. Our experiment r esults revealed that the microwave attenuation in ER fluid could be adjuste d by changing the external electric field. V(re think the change of the str ucture and dielectric property of ER fluid are the main cause of the fact t hat the transmittance could be adjusted under the external electric field.