Compact planar UWB antenna with 3.5/5.8 GHz dual band-notched characteristics for IoT application

Today's frontier demands ease in daily tasks and interaction with regular devices. This paper proposes an ultrawideband (UWB) planar antenna with a close-fitting size of 24mm×26mm. The structure of this antenna contains micro-strip line-fed circular ring radiator. The semi-circular slot that produces 5.8GHz of WLAN, and an annular circular slot that produces 3.5GHz of WiMAX. The dual-notched characteristics reduce interference among the already existing UWB operating devices as antenna shows a negative gain at notched bands. Antenna acquires a wide impedance bandwidth of 117.67% from 3.11GHz to more than 12 GHz for s11<; -10dB except for two frequency notched bands 3.28-3.85GHz and 5.11-6.4GHz for WiMAX and WLAN respectively. It has an omnidirectional radiation, high efficiency of 98.585%, radiation characteristics of the proposed antenna shows good stability and time domain behavior. All the observations make this antenna fit for IoT applications.