Design of Phased Array Antenna System for LoRa Applications

The proposed work focuses on the design and fabrication of a Phased array antenna system operating in the range of Long-Range communication (LoRa) band with center frequency of 915 MHz. The phased array antenna system consisting of a 2-element patch antenna array along with tunable phase shifter is designed using Reflection Type Phase Shifter (RTPS) method. The design offers the phase shift of 11.25°, 22.5° and 45°. The cooperate-fed array feeder network is designed using two-way Wilkinson's type structure to equally split power in to two ports to enhance port impedance matching and isolation. The experimental results show the system achieves return loss better than 10 dB in the overall range of frequencies. The phased array antenna system is designed and simulated using Advance Design System (ADS). The phased array antenna system is fabricated on low-cost Epoxy glass fiber FR-4 PCB board using the chemical method. The measured results and simulated results are in good agreement with each other.