The diffraction theory for the transmission of electromagnetic fields through a grid in a dielectric is derived and experimentally checked in the visible wavelength region. In the far infrared, an approximate mathematical representation is found to describe the grids in dielectrics. The empirical equations in the far infrared are combined with the electrical circuit transmission line analog for inductive grids. Detailed structure of the transmittance vs wavenumber curves are presented.
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Bell et al. (1970) studied this question.
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