MATLAB Source Code for Calculating Input Impedance of Rectangular Microstrip Antennas

In this article, we will explore how to calculate the input impedance of rectangular microstrip antennas using MATLAB. Input impedance is a crucial parameter that determines antenna matching efficiency and overall performance. Our implementation demonstrates MATLAB source code development for accurate impedance calculation. First, let's understand rectangular microstrip antennas. These are commonly used antenna types in microwave communication and radar systems, valued for their manufacturability, low cost, and lightweight characteristics. However, proper antenna operation requires precise impedance matching with transmission lines. The input impedance calculation is implemented through MATLAB code utilizing the Electromagnetic Simulation Toolbox. This toolbox provides essential functions and computational tools for antenna performance analysis. Key algorithms include cavity model implementations and method of moments (MoM) for accurate impedance characterization. Our demonstration covers step-by-step MATLAB source code development for rectangular microstrip antenna input impedance calculation. We explain each computational phase and provide sample code with corresponding results. The implementation involves parameter initialization for antenna dimensions, substrate properties, and frequency range, followed by impedance matrix computation using dedicated toolbox functions. Through this article, you'll learn to implement impedance calculations in MATLAB, gaining deeper insight into antenna performance optimization and matching network design. The code structure includes modular functions for parameter validation, impedance calculation, and result visualization, ensuring reproducible and accurate simulations.