A Wide Band-Gap Slot Fractal UC-EBG Based on Moore Space-Filling Geometry for Microwave Application

摘要

A wide band-gap slot fractal uniplanar compact electromagnetic band-gap (UC-EBG) structure based on the third iteration of Moore space-filling geometry (MSF-UC-EBG) is proposed. By changing the dimensions of the structure and the substrate materials, different band-gap characteristics can be obtained. In this letter, we design two kinds of MSF-UC-EBG structures, fabricated on FR4 and RogersRO3010 substrate, denoted as FR4_EBG and Rogers_EBG, respectively. Two wide band-gaps of 1.43–5.89 GHz (relative bandwidth 121.8%) and 1.09–4.57 GHz (relative bandwidth 122.9%) are achieved when five MSF-UC-EBG unit cells are arranged periodically. The measurements agree well with simulations. Furthermore, the aforementioned FR4_EBGs are integrated with a coplanar-waveguide-fed stepped-impedance resonator (SIR) antenna to research the MSF-UC-EBG's microwave application. After integration, bandwidth performance of SIR antenna is significantly improved. Comparisons of measured bandwidth of SIR antenna with and without FR4_EBGs are made, respectively.