A study on the electric field distribution in an automobile body for an antenna system mounted inside the body

The electric field distribution in an automobile body must be known when developing an antenna system mounted inside the car body for mobile communication. A microwave simulation experiment was carried out in an electromagnetic anechoic chamber using 4 GHz band signals and a miniaturized automobile. The automobile model used in this simulation experiment was about 1/15 of the size of the actual automobile under consideration. A simpler box-type model with large apertures was also studied. The internal electric field distribution measured in the box model was estimated to be a combination of the resonant TE_Pmn modes excited in the box. which acted as a resonant cavity. The spatial and frequency dependence of the internal automobile´s electromagnetic field for each model is plotted for the frequency range 3-5 GHz