A highly miniaturized Ultra-Wideband antenna with a triple-band Notch for wearable applications

Abstract

In this paper, a compact UWB antenna with a triple-band notch for wearable applications is designed andsimulated for Ultra-Wideband (UWB) applications with theoperating frequency from 3.1GHz to 10.6GHz. The antennacan be used for UWB applications, while at the same time, isable to reject the narrowbands namely, WiMAX (3.2GHz to3.6GHz), C-band (3.7GHz to 4.2GHz) and WLAN (5.15GHz to 5.35GHz). Two slots are introduced on the radiatingpatch of the antenna to notch the three narrowbands,instead of three slots to notch each narrowband. Theantenna is designed on a semi-flexible Rogers DuroidRO3003TM substrate. The final outcomes indicate that theantenna can operate over the UWB frequency from 3.09GHz to 11.09GHz. The antenna is able to notch the WiMAXand C-bands with a frequency range from 3.16GHz to 4.20GHz and the WLAN band with a frequency range from 5.14GHz to 5.34GHz. The performance of the antenna inbending condition is also examined with the antenna bentover a varying diameter of vacuum cylinder starting from50mm, 80mm and 100mm. It is shown from the reflectioncoefficient of each diameter that the performance of theantenna is not affected by bending and thus, is particularlyuseful to be worn on body for wearable applications, otherthan its compact size of 19mm×14mm. The SAR resultsobtained shows that the antenna obeys the guidelines for1mW of input power.