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A modified finite element method with new solving algorithm is proposed to analyze the electromagnetic problems of finite periodic structures. The dielectric-loaded parallel-platees with rectangular and triangular dielectric gratingas an example of the present approach. Numerical results are checked by the self-convergence test and by comparing with those obtained by other methods. Finally, the dependences of the scattering parameters on the frequency, the period number,the grating height are analyzed and compared.
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