The significance of linear non-uniform electromagnetic wave in object detection

Based on the antenna radiation theory, the universality, detectability and main characteristics of linear non-uniform electromagnetic wave are analyzed. When an object is illuminated by a linear non-uniform electromagnetic wave, there exists special phenomenon, such as induced eddy current and so on. Meanwhile, the definition of scattering function illuminated by a linear non-uniform electromagnetic wave is given. Computed by the method of moment (MoM), it is shown that the scattering characteristic of a metallic plate illuminated by a non-uniform wave is totally different from that by a uniform plane wave, and the peak magnitude is even bigger, which sufficiently demonstrates the significance of linear non-uniform electromagnetic wave in material detection.