A Hexagonal Slotted CPW-Fed Antenna with Parasitic Patch for Internet of Things Applications

This paper presents a coplanar-waveguide fed hexagonal slotted microstrip patch antenna with a parasitic patch. This antenna has an overall dimension of $50\text{mm}\times 92 \text{mm} \times 1.6\text{mm}$. The antenna performance is improved by inserting a hexagonal parasitic patch at the centre of the radiating patch. The simulated result of the proposed antenna shows multiband characteristics with frequency bands (0.8GHz - 1.04 GHz); (2.27 GHz -2.52 GHz); and (3.71 GHz - 4.11GHz) which covers wireless standards such as LoRa, Zigbee, SigFox, Wi-Fi, Bluetooth, commonly used in IoT systems. The proposed antenna is fabricated and experimentally investigated. The measured results are found to be in good agreement with the simulated results. The radiation patterns of the proposed antenna show that it is nearly omnidirectional in both E-plane and H-plane. The effects of various parameters on the antenna performance are analyzed and discussed as well.