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

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.

[1]  Yuefeng Ji,et al.  Wideband quasi-isotropic H-shaped slot fractal UC-EBGs with alternately arranged symmetrical unit cells , 2013 .

[2]  M.Z. Azad,et al.  Wideband Smaller Unit-Cell Planar EBG Structures and Their Application , 2008, IEEE Transactions on Antennas and Propagation.

[3]  D. Werner,et al.  An overview of fractal antenna engineering research , 2003 .

[4]  C. Collado,et al.  Miniaturization of superconducting filters using Hilbert fractal curves , 2005, IEEE Transactions on Applied Superconductivity.

[5]  Hyun Chang Park,et al.  Wideband uniplanar compact electromagnetic bandgap structure with diagonal connecting elements , 2012 .

[6]  Gao Baoxin,et al.  Novel compact photonic band‐gap structures using rectangular increasing‐distance spiral slots , 2004 .

[7]  Wen-Hua Tu,et al.  Dual-Band/Tri-Band/Broadband CPW-Fed Stepped-Impedance Slot Dipole Antennas , 2014, IEEE Transactions on Antennas and Propagation.

[8]  D. Sievenpiper,et al.  High-impedance electromagnetic surfaces with a forbidden frequency band , 1999 .

[9]  Yan Wang,et al.  A novel fractal multi-band ebg structure and its application in multi-antennas , 2007, 2007 IEEE Antennas and Propagation Society International Symposium.

[10]  Yuefeng Ji,et al.  A Pole and AMC Point Matching Method for the Synthesis of Hsf-UC-EBG Structure with Simultaneous AMC and EBG Properties , 2013 .

[11]  Xiang-yu Cao,et al.  Uniplanar EBG structure with improved compact and wideband characteristics , 2008 .