Some useful conclusions are drawn , eb - fem is combined with leontovich ibc here to analyze the electromagnetic scattering by a cavity coated with layered medium . the multi - reflection of the electromagnetic wave in the medium is involved , and the precision of the method is improved 将leontovichibc与eb一fem相结合对内壁涂覆多层介质的电小尺寸开口腔体的电磁散射特性进行分析，计入了介质内部电磁波的多次反射，提高了ibc邝em方法的精度。
