基于UC-EBG的紧凑微波光子晶体研究

Research on Compact Microwave Photonic Crystals Based on UC-EBG Structure

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。

Focusing on the problem that the electromagnetic band gap（EBG） structure of conventional microwave photonic crystals is not compact enough, a novel uni-planar EBG（UCEBG） structure is presented based on the physical mechanism and equivalent circuit model of EBG structures. Incorporated with the meandered strips and the spiral shape gaps, this structure significantly enlarges the equivalent capacitance between neighboring elements, as well as increases the equivalent inductance. Experimental results show that the obvious frequency band gap is observed, and its center frequency is 48.1% lower than that of conventional EBG with a relative bandwidth improvement of 24.3 %, realizing the compact wideband UC-EBG structure.