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Moment Method Analysis of the Electric Shielding Factor of a Conducting TM Shieldat ELF

机译:导电Tm shieldat ELF电屏蔽系数的矩量法分析

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This report presents an integral equation and method of moments (MM) solution tothe problem of TM transmission by a metallic conducting shield at extremely low frequencies (ELF). In order to obtain an accurate and efficient solution, the equivalent volume polarization currents representing the shield are expanded in terms of a physical basis expansion corresponding to two plane waves propagating normal to the surface of the shield. ELF approximations are used to obtain closed form expressions for certain crucial elements in the MM matrix equation where extreme accuracy between the relative magnitudes of self and mutual impedance terms are required. An alternate method for computing the shielding factors, based upon the use of the volume equivalence theorem to directly compute the total fields in the shield is devised. This alternate method is found to be sufficiently accurate to compute the electric, but not the magnetic shielding factor.

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