A NOVEL TWO-LAYER VERTICAL WIRE MEDIUM FOR ENHANCING MONOPOLE ANTENNA GAIN IN LoRaWAN-BASED IoT APPLICATIONS
DOI:
https://doi.org/10.55766/sujst10998Keywords:
High Gain, Internet of Things, Long Range Wide Area Network (LoRaWAN), Monopole Antenna, Wire Medium StructureAbstract
This research proposed a novel approach to enhance the gain of a monopole antenna. The design integrated a wire medium metamaterial structure and a dielectric material with a quarter-wavelength monopole antenna to improve gain performance, while maintaining compact size and lightweight characteristics. The antenna was designed to operate at a frequency of 922.5 MHz for use in a long range wide area network (LoRa WAN). The proposed structure consisted of a quarter-wavelength monopole antenna surrounded by a two-layer vertical wire medium. A polyamide material, shaped into a cylindrical form, was used as a spacer between the two layers of the vertical wire medium. Simulation results demonstrated that the dielectric wire medium significantly enhanced the gain of the monopole antenna from 4.5 dBi to 12.3 dBi-an improvement of 7.8 dBi. The antenna also exhibited a symmetric radiation pattern with reduced side lobes. The proposed technique enhanced the performance of existing systems without necessitating additional power input. To validate the simulation results, a prototype antenna was fabricated and experimentally tested. The measured results demonstrated good agreement with the simulations in terms of reflection coefficient, VSWR, radiation pattern, and gain.
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