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

Abstract

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 $$\times$$ 30 $$\times$$ 0.8 mm3 is fabricated on a FR-4 substrate of thickness of 0.8 mm, with relative dielectric constant $${{\mathbf{\varepsilon }}_{\mathbf{r}}}$$ = 4.4 and loss tangent $$\tan \varvec{\delta}$$ = 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.