Design Of Planar Monople Antenna For Wireless and Energy Harvesting Applications

A planar circular monopole antenna with slots/slits in the patch and ground plane is presented. With reduced resonant frequency and enhanced bandwidth is presented. Slots/slits in patch and ground plane give rise to band rejection in some frequency range. The antenna operates over a wide frequency range, covering some of wireless standards/protocols at the same time, such as Wi-Fi, WiMAX, Bluetooth, RFID and GPS (L1). The antenna is simulated in HFSS and measured using pocket VNA. The simulated result shows S11 parameter less than -10dB from 0.72GHz to 1.24GHz and again from 1.52GHz to 2.65GHz. The measured result shows S11 parameter of around -10dB and less from 0.628GHz to 1.28GHz and again from 1.466GHz to 2.72GHz. Without using any slot in the ground plane and patch, the simulated result shows S11 parameter less than -10dB from 0.85GHz to 2.18GHz. The simulated gain obtained is around 4dBi at almost all the frequencies. Thus simulated results closely match with the measured results. Without using slots/slits, the simulated S-parameter shows S11 less than -10dB from 0.84GHz to 2.25GHz. The fabricated antenna occupies the dimension of 160mm × 76mm. The substrate used in the antenna is FR4 epoxy having relative permittivity 4.4 and thickness 1.6mm. The designed antenna, besides its use in wireless communication, finds application in energy harvesting where low frequencies are abundantly present in the environment.