  We show how to use the lattice Green function to calculate capacitances in
two dimensions with boundary conditions at infinity. It is shown how to
calculate coefficients of capacitance and induction from the lattice Green
function. A general analysis of two arbitrary conductors is carried out. It is
shown how the calculations can be simplified in the case of identical
conductors when certain symmetry conditions are met. Example calculations for a
parallel and coplanar stripline are shown. The use of the two conductor
formulas for the case of three or more conductors is discussed.
