This small HTML/JavaScript page provides an interactive tool for quickly estimating the physical width (W) and electrical length-based physical length (L) of a microstrip transmission line or rectangular microstrip patch antenna. Below is a walk-through of the key ideas and the workflow implemented in the code. 1. User interface Front-end stack Bootstrap 4 is loaded from a CDN to give the form a clean, responsive look. A simple <table> holds five numeric inputs: Resonant frequency f (GHz) Relative permittivity of the substrate εr Substrate height h (mm) Desired characteristic impedance Z0 (Ω) Desired electrical length (degrees) Calculate button – when clicked, it runs the function calculateMicrostripAntenna() and prints the results in millimetres under the table. 2. Core JavaScript routine function calculateMicrostripAntenna() { … } Step What happens Formula / reasoning a. Unit handling • Reads the five text-box values using docume...