Dual-band monopole antenna loaded with ELC metamaterial resonator for WiMAX and WLAN applications

In this paper, a miniaturized ELC (Electric-inductive-capacitive) based dual-band antenna is proposed for WiMAX and WLAN Applications. The designed antenna consists of a ring monopole antenna coupled with ELC resonator and partial rectangular ground plane, which is fed by 50Ω microstrip transmission line. ELC metamaterial modifies the current direction and yields dual-band characteristics. The band characteristics of the ELC metamaterial element are explained in detail. The proposed antenna with a compact size of 30 ×\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\times$$\end{document} 30 ×\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\times$$\end{document} 0.8 mm3 is fabricated on a FR-4 substrate of thickness of 0.8 mm, with relative dielectric constant εr\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${{\mathbf{\varepsilon }}_{\mathbf{r}}}$$\end{document}= 4.4 and loss tangent tanδ\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\tan \varvec{\delta}$$\end{document} = 0.002. The experimental results cover the bandwidth of 500 MHz (3.57–4.04 GHz) and 860 MHz (4.73–5.59 GHz) with a resonance frequency of 3.74 and 5.1 GHz, respectively, which is suitable for WiMAX and WLAN applications.