中文摘要：

该文采用电磁波反射、透射和传输线理论，建立了分析磁性平板功率传输系数和计算插入相位移的方法，给出了消除“退极化”现象天线罩材料电磁参数必须满足的数学公式。计算和分析了单层和典型A夹层结构天线罩在电介质材料和磁性材料两种情况下表现出的传输特性，结果表明，磁介质平板材料电磁参数满足εr=μr（复介电常数等于复磁导率）时，可以避免“退极化”现象，功率传输系数优于对应的电介质平板，插入相位移变化更为平缓，表现出了最佳的传输特性。最后，利用商业软件HFSS进一步验证了上述结论的正确性和该方法的有效性。

英文摘要：

In this paper, theories of electromagnetic reflection and transmission as well as transmission line are adopted, a simulation method is designed to calculate power transmission coefficient and insertion phase shift, and also the mathematical formulas are deduced that the electromagnetic parameters of material used in radomes must be satisfied to remove the depolarization phenomenon, a single magnetic slab is used to discuss and verify the formulas. A special A sandwich radome, as a example, is calculated to analysis the effects of the magnetic and dielectric materials on the power transmission coefficient and the insertion phase shift. It is found that the phenomenon of depolarization can be avoided for A sandwich radome structure once when cr = #r （the relative complex permittivity of the magnetic material equals its relative complex permeability）, and the power of transmission coefficient for magnetic material is better, the insertion phase shift is smoother, and the property of transmission performance is better than those of the electric material. Finally, the commercial software HFSS further verifies the correctness of the conclusions and validity of the method.