REFLECTION AND TRANSMISSION CHARACTERISTICS OF LOSSY PERIODIC COMPOSITE STRUCTURES

A periodic surface integral formulation is proposed to analyze the ref lection and transmission properties of a lossy periodic composite stru cture which has circular conducting fibers embedded in a dielectric ma trix. This formulation is based on the equivalence principle which rep resents the unknown electric and magnetic currents over the material d iscontinuity interfaces, and uses the structure periodicity and Poisso n summation formula to reduce the problem to a periodic cell, These su rface integral equations are then solved numerically, using the method of moments with poise bases and point matching. In this study, only t he transverse magnetic (TM) case is analyzed and the numerical results such as reflected, transmitted, and dissipated powers for a single-la yer fiber-reinforced composite structure are presented, in detail, to discuss the effects of frequency, incident angle, fiber radius, fiber conductivity, embedding dielectric, etc. Convergence study and compari son with the previous published results are also included to confirm t he accuracy of the new formulation.