EBG高阻表面的准静态等效媒质模型

Improved quasi-static effective medium model of the electromagnetic band gap(EBG)high-impedance surface

针对电磁带隙高阻抗表面的电磁特性问题,提出了一种新型准静态等效媒质模型,建立了电磁带隙高阻抗表面的几何特性、媒质特性和电磁特性之间的定量关系.当工作波长λ远大于电磁带隙高阻表面每个单元的几何尺寸时,高阻表面与波的宏观相互作用相当于等效媒质.通过准静态电磁理论的分析建立的高阻表面等效媒质模型,可对电磁带隙高阻表面和应用的天线系统各自独立地进行设计.最后给出了分析计算值和实验之间的相互比较,证明了该理论模型的有效性.

For the complex electromagnetic property of the electromagnetic band gap（EBG）highimpedance surface,an improved quasi-static effective medium model is proposed, which makes a quantitative relationship among the geometry,medium properties and the electromagnetic properties of the EBG high-impedance surface.The macroscopic interaction of the wave with the EBG high-impedance surface is equivalent to that of the wave with an effective medium when the wavelength is large compared with the dimension of each cell of the high-impedance surface.With the effective medium model proposed by quasistatic electromagnetic theory,designs of the high-impedance surface and its application system such as antenna system can be implemented separately.Some numerical simulations and experiments of practical high-impedance surfaces are given to illustrate the applications and validity of the proposed model.