| The concept of electromagnetic band gap(EBG)structure is derived from photonic crystal.The EBG structure possesses two unique properties:in-phase reflection band gap and forbidden band gap.And it can be divided into conventional mushroom electromagnetic band gap(CMT-EBG)and uniplanar compact electromagnetic band gap(UC-EBG).Moore curve is a variant of Hilbert curve,having space-filling property.In this paper,we design slot UC-EBG based on third moore space-filling geometry and research its application in low frequency stepped-impedance resonator antenna and 60GHz patch antenna.Firstly,we design slot UC-EBG structure based on third Moore space-filling geometry,denoted as MSF-UC-EBG.By changing the dimensions of the structure and the substrate materials,different bandgap characteristics can be obtained.In this paper,three wide bandgaps of 1.43-5.89 GHz,1.09-4.57 GHz and 52.5-66.7 GHz are achieved when 5 MSF-UC-EBG unit cells are arranged periodically,with FR4,Rogers RO3010 and FR4 substrates.They are denotes as FR4 EBG,Rogers EBG and 60GHz_EBG respectively for convinience.Furthermore,MSF-UC-EBG's application in antennas is investigated.The research result show that MSF-UC-EBG structure can not only be applied to low frequency antenna but also 60GHz high frequency antenna.It can effectively improve the performance of antenna,especially bandwidth performance.For SIR antenna,the 6-dB bandwidth is 1.5-4.4 GHz;the 10-dB bandwidth is 1.75-2.8 GHz and 3.3-4.2 GHz.After combination,its 6-dB bandwidth can be expanded to 1.5-4.7 GHz and the 10-dB bandwidth coversl.8-4.5 GHz.Besides,its gain performance is more stable and its radiation patterns are almost not affected.For the 60 GHz patch antenna,simulation results show that the bandwidth is enhanced by 2.4 GHz from 57.1-62.7 GHz to 56.5-64.5 GHz.The research results provide instructions for the design and analysis of EBG structure based on space-filling curve.They also provide new ideas for the application of EBG structure on antennas. |
PDF Full Text Request