This chapter presents the development of a user-friendly MATLAB-based electronic design automation (EDA) tool for RF/microwave antenna design. The development steps of EDA using MATLAB ‘guide' and MATLAB ‘appdesigner' design environments have been explained in detail. In this chapter, seven EDAs of different antennas are developed and described. The EDA is capable of predicting the dimensions of the antenna by inputting the desired operating specifications of the antenna, such as operating frequency. The rigorous analytical formulations that are implemented in this EDA are briefly described. The developed EDAs have simple and standalone guide user interface (GUI) display and fast program running time compared to iterative solution or numerical-based EDAs. The developed EDAs can be packaged and accessed either as standalone desktop app or web app. The accuracy of the EDA output results is validated by comparing to measurement and simulation results obtained from a commercial simulator.