Estimation of capacitance of different conducting bodies by the method of rectangular subareas

The capacitance evaluation of arbitrary-shaped conducting bodies is an important step for the estimation of spacecraft equivalent circuit model for the prediction of electrostatic discharge. In this paper, an attempt has been made for the evaluation of charge distribution and hence the capacitance of arbitrary-shaped conducting surfaces. Surfaces are modeled by planar rectangular subdomains in which the charge density is assumed to be constant. The exact formulation for the matrix element is evaluated for rectangular subsection. The Method of Moments with pulse basis function and point matching is employed to calculate the charge distribution on the surface and hence the capacitance. This paper presents the results for capacitance of different conducting shapes, e.g., square, rectangular, circular, annular circular disk, T-shaped, L-shaped, triangular, annular triangular, etc. The results have been compared with other available results in literature wherever possible.