A model for electromagnetic leakage of information from electron beam in CRT´s acceleration region

Using a method based on the radiation from moving charges, the paper models the electromagnetic field of an electron beam in the acceleration region of a CRT. From this model, the radiation field is directly associated with the electron beam current, and it can be analyzed and calculated by numerical methods. Further, the frequency spectrum of the radiation field has been transformed. The character of the frequency spectrum is that each lobe has the same video information. The whole spectrum and the video signals can be recovered by processing each lobe. The numerical simulation results are in agreement with experiments.