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Capacitance of disk capacitors

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2 Author(s)
Nishiyama, H. ; Fuji Tech. Res. Center Inc., Tokyo, Japan ; Nakamura, M.

The capacitance of a parallel-plate capacitor is formulated in basic electrostatics, assuming that the separation between the two electrode plates is very narrow and the fringe field of the edges is negligible. However, in practical problems of electrical and electronic engineering there are many cases where the plate separation is wide and the fringe field effect cannot be neglected. In the authors' previously published paper the capacitance of strip capacitor was computed by the boundary element method (BEM) for the case where the separation becomes wide, and a new empirical formula of the capacitance against the plate separation was derived. The empirical formula agreed well with experimental data. A formula for the capacitance of a parallel plate disk capacitor is presented. The formula is valid over a wider separation than formulas presented previously. As a special case of the problem, the capacitance of parallel plate ring capacitors is computed by the BEM

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Components, Hybrids, and Manufacturing Technology, IEEE Transactions on  (Volume:16 ,  Issue: 3 )