Design of Antenna Array Based Beam Repositioning for IoT Applications

Abstract

Internet-of-things has altered pervasive figuring with many applications created around different kinds of sensors/devices. As for these applications lower data-rate is required, so Long Range i.e., LoRa, which is a progressive wireless standard for low power WAN rightly serves this requirement. In the present work, the proposed array antenna has dimensions as 159 × 210 × 2.55 mm 3 with patch of annealed copper and FR-4 (lossy) as the substrate, operating at 433 MHz (LoRa band). Slots are cut in shape of letter 'T' to further improve the performance parameters. The simulation results showed a considerable improvement with the proposed array antenna, as the behavior of the antenna improves in terms of its gain i.e., 2.67 dB which is higher than the gain of single patch i.e., 0.9822 dB. Further the slotted ground plane improved the gain to the best of its value i.e., 3.561 dB. Lastly, beam steering or re-positioning was observed and its effect on main-lobe direction was studied. In this work other parameters like surface current, return loss and current density were also analyzed. The simulations are performed in "Computer Simulation Technology" i.e., CST Microwave Studio. The various parameters have been optimized to obtain the desired values.