LOW-FREQUENCY ELECTROMAGNETIC COUPLING ACROSS LOADED APERTURES WITH JOINTS

The diffraction of an electromagnetic wave across an aperture which is bounded by joints of uniform or non-uniform resistance, is studied wi th the aid of a numerical code based on the Method of Moments. For a j oint of uniform resistance, the results obtained are in good agreement with the analytical results produced by the Casey model. To our knowl edge, no model exists for joints in which resistance is not evenly dis tributed. In this case, the results obtained using the numerical code demonstrate that the attenuation of the equivalent dipole decreases un til, beyond a certain frequency, it reaches a constant value. This is in contrast to the case of the uniform joint where the dipolar attenua tion behaves as a first-order low-pass filter