LoRa Microstrip Antenna with DGS and Truncated Corner Structure for CubeSat

The development of CubeSat is currently experiencing a rapid increase. One of the growing missions is the space-based Internet of Things (IoT) network using LoRa protocol. The antenna installed on the spacecraft is essential for receiving data from sensors. Compact and adaptable microstrip antennas are commonly used in this design. This study has investigated a microstrip antenna design that incorporated the truncated corner and defected ground structure (DGS) method to improve the antenna performance. Its shape was designed to fit the CubeSat form factor. The antenna is working at 922 MHz of frequency. The experiment result showed that the antenna has return loss of $\mathbf{1 2. 7 4 6}$ $\mathrm{dB}, \mathbf{1 2} \mathrm{MHz}$ of bandwidth, and 1.8 of VSWR. It produces bi-directional beam pattern that has 1.14 dBi of gain with elliptical polarization. The antenna has been integrated with a LoRa module and a range test has been conducted to validate the antenna performance. The result was the antenna was able to communicate with the other LoRa module.