The first chapter provides an overview of the background to the choice of materials and the current state of radio frequency technology. This textbook is intended to teach the mechanisms of electromagnetic wave propagation phenomena in electrical circuits. Furthermore, the reader should be able to analyze and optimize a variety of circuits in radio frequency technology. It also helps electronics engineers to understand the effects of fast circuits and provides a basic framework for future radio frequency engineers. First and foremost, this book is intended to help engineers in radio frequency technology to develop modern products. Since new innovative products cannot be realized without a development environment and the necessary basics, the following topics formed the guideline for the structure of this book: