Microwave circuits is a field of electrical engineering and applied physics dedicated to the design, analysis, and implementation of electrical circuits operating within the microwave frequency spectrum, typically from 300 MHz to 300 GHz. This research area investigates the unique electromagnetic phenomena, distributed parameter effects, and specialized component behaviors that become dominant at these wavelengths, which are comparable to or smaller than circuit dimensions. Its significance stems from its fundamental role in enabling a vast array of modern technologies, including wireless communications, radar systems, satellite technology, and advanced sensing applications.