Abstract: A novel tunable Electromagnetic Band-Gap, 2-D ferrite EBG, the performance of which can be adjusted by changing applied biased magnetic field, is proposed. The finite element method of the hybrid of edge-elements and node-elements incorporated with vector Floquet Theism is employed for calculating the scattering properties of this kind of EBG. Comparisons and Analysis of the frequency response of the transmitting power for this kind of ferrite EBG with different applied magnetic fields are presented, which shows better characteristic of stop and pass band-gaps，and more importantly the performance of the EBG devices is changeable by adjusting the biased magnetic filed. It indicates the possibility of R/D a novel performance tunable EBG.

Key words: electromagnetic band-gap (EBG), ferrite, finite element method(FEM), Floquet theorem

摘要： 提出了一种新型的可利用改变外加偏置磁场对其特性进行调节的电磁带隙（EBG）——铁氧体EBG，并采用混合基有限元和Floquet定理相结合的方法，对其散射特性进行了仿真计算和数值分析。通过对不同外磁场下该类EBG的透射系数的频率响应的比较和分析表明：该类EBG较相同结构的各向同性EBG具有更好的通带和阻带特性，更重要的是通过调节外加偏置磁场的确可以改变该EBG的工作状态。这将可能研发出一种新型的功能可调的EBG。

关键词: 电磁带隙（EBG）, 铁氧体, 有限元方法（FEM）, Floquet定理