TDEFIE-PMCHW Method Combined With an Adaptive Marching-On-in-Order Procedure for Studying on Time- and Frequency-Domain Responses of Some Composite Structures

One effective method, based on time-domain PMCHW (Poggio, Miller, Chang, Harrington, and Wu) integral equation, is presented for studying on time- and frequency-domain electromagnetic responses of some composite structures. A set of derived equations is solved by an adaptive marching-on-in-order (MOO) procedure. During its implementation, dielectric parts of the composite structure are described by the PMCHW equations, and its metallic parts are governed by the time-domain electric field integral equations, where temporal basis of the Laguerre polynomials are employed for both of them. As an example of composite microstrip patch structure, its dielectric- metallic junction is handled using an appropriate combination of the full RWG basis functions so as to obtain high computational accuracy, and one MOO acceleration scheme is employed for accelerating the temporal convolution effectively. Numerical results are given to demonstrate efficiency as well as accuracy of our proposed method used for capturing electromagnetic responses of some typical composite structures, with their transient current responses, far-field distributions, radar cross sections, and directivities predicted successfully.