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为了提高微波光子晶体结构尺寸的紧凑性,根据其局域谐振原理和等效电路分析模型,对已有的电磁带隙(EBG)结构进行了改进,得到了一种新型EBG结构。该结构通过引入弯曲折线延长了电流长度,增大了等效电感效应,同时采用了螺旋结构,延长了等效磁流,增强了等效电容效应。实验结果表明,新结构能够产生频率带隙,其带隙中心频率比已有的EBG结构低48.1%,且相对带宽也有24.3%的改善,达到了实现紧凑宽带EBG结构的目的。
In order to improve the compactness of microwave photonic crystal structure size, the existing electromagnetic bandgap (EBG) structure is improved according to its local resonant principle and equivalent circuit analysis model, and a new type of EBG structure is obtained. The structure increases the current length through the introduction of bending fold lines, increases the equivalent inductance effect, and simultaneously adopts a spiral structure to extend the equivalent magnetic current and enhance the equivalent capacitance effect. The experimental results show that the new structure can generate frequency bandgap. The bandgap center frequency is 48.1% lower than the existing EBG structure, and the relative bandwidth is improved by 24.3%, achieving the purpose of compact broadband EBG structure.