Miniaturization of Substrate Integrated Waveguide based Antennas for Microwave Communications

Abstract

Substrate Integrated Waveguide (SIW) technology is the most emerging technology for the implementation of effective radiating systems for the future wireless systems. It is a synthetic rectangular electromagnetic waveguide which is formed in a dielectric substrate by densely arraying metalized posts or via-holes which connect the upper and lower metal plates to form a radiating system. SIW antennas are used in many applications in the field of communication systems due to several advantages such as light weight, low production cost, low profile, reproducibility, reliability, and integration with solid state devices. This paper presents the methods of miniaturization of equilateral triangular micro strip antenna based on SIW technology. The performance of the proposed antennas is observed by doing some significant changes to the construction of the patch, substrate and ground with specified dimensions. The coaxial feeding at a specified location is used to achieve better impedance matching and Arlon AD270 substrate having dielectric constant 2.7 with optimum values of substrate heights are used. The miniaturization and performance of the antennas are compared in terms of Return losses, VSWR, radiation pattern and gain. The proposed antennas are designed and simulated using Finite element method based HFSS (High Frequency Structure Simulator) version software.