A compact ultra wide band antenna using slots for Internet of Things applications

In this paper, a small size and low cost antenna is proposed suitable for Ultra Wide Band (UWB) short-range communication applications having reduced interference for multiband operation at WiMax, C-band and X-band systems. The designed antenna covers the ultra wide band range (3.1 GHz to 10.6 GHz) and has Voltage standing wave ratio less than 2 and the return loss is less than -10db, reducing the interference due to narrow band systems. The L and U shaped slots creates multiple bands at 3.36 GHz and 4.4 GHz respectively, due to which a notch is created at 3.6 GHz to reduce interference at this frequency. The C-shaped slots are inserted to obtain multiband in X-band at 7.36 GHz frequency, thereby notching the region of 7.7 GHz to 9 GHz. The antenna shows nearly omni-directional radiation pattern in H-plane. The simulation results are done by using the ANSOFT High Frequency Structure Simulator (HFSS) and measurement is done using Agilent N9916A FieldFox handheld vector network analyzer.