Abstract
A compact ultra-wideband antenna (UWB) is presented in this paper for WLAN, WiMAX, LTE and Smart grid applications. The proposed antenna comprises a circular patch and rectangular slot in center of circular patch and apart from this it also consists of four small rectangular slots around circular patch to provide wideband. The antenna is fabricated onto Rogers R03003 substrate with an overall dimension of 47X47 mm. The substrate has dielectric constant of 3 and thickness of 1.6 mm. The simulated experiment shows that the proposed antenna achieves good impedance matching an operating bandwidth of 2.5–8.2 GHz (106.5%) and 10-15 GHz (40%) that covers the lower UWB and higher UWB band. Thus it covers WLAN 5.2/5.8 GHz band, WiMAX 2.5/3.5/5.5 GHz band and LTE 2.5-2.69 GHz band. The gain of this antenna varies between 2-3 dBi for most of the frequency band and therefore the proposed antenna is suitable for being used in UWB communication applications.
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