Mj. Park et al., EFFICIENT CALCULATION OF THE GREENS-FUNCTION FOR THE RECTANGULAR CAVITY, IEEE microwave and guided wave letters, 8(3), 1998, pp. 124-126
An efficient method is developed for the rapid and accurate calculatio
n of the potential Green's function in the rectangular cavity. The pro
posed method is based on the Ewald sum technique and converts the slow
ly convergent cavity Green's function into the sum of two exponentiall
y convergent series, The transformed series achieves fast convergence
with only a small number of terms in the calculation.