Data Logger of Temperature, Humidity, Barometric Pressure with LoRa Module 915 MHz Using Two Array Rectangular Microstrip Antenna on Elevation

Abstract

LoRa has become one of the most efficient solutions in implementing the Internet of Things (IoT) due to its essential features, such as cost-effectiveness and low-power wireless platform. The microstrip antenna is a unique type of antenna known for its lightweight, small size, ease of fabrication, and the ability to conform to various surfaces. Compared to other types of antennas, it has a smaller physical footprint. In terms of radiation pattern measurement, the microstrip antenna exhibits bidirectional characteristics, meaning it focuses the signal radiation in two specific directions. The objective of this research is to examine and evaluate how the communication quality between LoRa modules is affected by using a bidirectional microstrip antenna. This is compared to the built-in LoRa antenna, which has an omnidirectional radiation pattern, distributing signals evenly in all directions. The study aims to analyze the impact of the bidirectional microstrip antenna on the performance and communication range within the LoRa network. Based on the performance comparison graph of Received Signal Strength Indicator (RSSI) for each antenna – the built-in antenna, the microstrip antenna, and the microstrip antenna at a 90° tilt – it is evident that the microstrip antenna at a 90° tilt exhibits the highest RSSI value, while the built-in antenna shows the lowest RSSI value.