Gg. Gentili, BOUNDARY-ELEMENT ANALYSIS OF PLANAR CIRCULATORS - A DISCUSSION ON SPURIOUS SOLUTIONS AND THEIR ELIMINATION, IEEE transactions on magnetics, 31(1), 1995, pp. 862-869
Some results on the application of the Boundary-Element Method to the
computation of the scattering parameters of planar circulators also wo
rking in the region mu(eff) < 0 are presented. Spurious solutions are
first pointed out, and two different ways to eliminate them are discus
sed. The analysis supports Schroeder's explanation of the appearance o
f spurious modes in integral equation techniques. Extensive numerical
simulations are presented to validate the formulation proposed.