A study on characteristics of electromagnetic waves propagating through the space between overlapped metal plates: (Part-I estimation of shape of space between overlapped metal plates)

The characteristics of electromagnetic (EM) waves propagating through the space between overlapped metal (conductive) plates and electrically conductive parts, which usually exists around a metal shielded box, are discussed in this study. The authors developed a method for measuring the current density distribution on the interface between the overlapped and energized metal plates. Using this method, the author estimated that the general area of the electrically conductive parts is less than about 10×10 mm2. Thus, the space between overlapped metal plates and electrically conductive parts is frequently expected to be extremely thin for the width and short in the direction of EM wave propagation.