Inset Fed Miniaturized Antenna with Defected Ground Plane for LoRa Applications

Abstract

Nowadays, there is a lot of research about communication technology for long range communication with low power consumption for IoT (Internet of Things) devices.LoRa (Long Range) is one of the modulation technique that facilitates it. The antennas used for LoRa are mostly monopole because the size of the patch antenna at frequencies below 1 GHz is not sizable for IoT devices. This paper discusses the miniaturization technique for patch antenna to work in frequencies suitable for LoRa application. In this paper, a rectangular patch inset fed antenna with the etched ground is proposed which can be used in the ISM band. This antenna resonates at 871 MHz. The proposed design generates linearly polarized waves. Fabricated results show VSWR = 2, and has a bandwidth of 28 MHz, which is 15 MHz more than the simulated design. Ansys HFSS is used for antenna simulation and a prototype which has been fabricated and tested using Keysight Vector Network Analyzer N9925A.