Ring capacitance in microstrip

In this article we propose a general method for estimating the capacitance of a ring placed on a dielectric supported by a metal plane. The problem, f ormulated as three integral equations, valid in complementary regions, is r esolved by adopting a new expansion, which we have called double Neumann se ries, according to which the unknown of the problem is expanded by adopting a series of two Bessel function products. (C) 1999 Elsevier Science B.V. A ll rights reserved.