An edge-element, face-element time-domain (EFTD) method for solving Maxwell's equations in inhomogeneous media is developed. The updating equations for the E- and H-fields are derived by integrating Ampere's and Faraday's laws directly over prescribed surfaces and contours. A diagonalization technique is introduced to reduce the rectangular version of EFTD to the finite-difference time-domain (FDTD) method. For structures that require gridding with both rectangular and conformal cells, the equivalent FDTD algorithm is used in the rectangular-cell region to enhance the overall efficiency while the EFTD algorithm is used in the conformal-cell region to achieve high accuracy for curved boundaries. Good results have been obtained for the resonances and transient responses of various test structures.
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Thng et al. (1996) studied this question.
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