In this paper, an enhanced 3-D differential surface admittance operator is proposed, facilitating accurate modeling of piecewise homogeneous cuboidal objects. By exploiting the analytical properties of entire-domain basis functions, material interfaces are effectively eliminated from the formulation, leading to a reduction in the number of unknowns without compromising the accuracy of the operator. After a validation of the novel approach, its effectiveness is demonstrated through the analysis of the impedance responses of on-chip interdigital capacitor structures.
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