Louis Frenzel is an American author, engineer, and professor with over 40 years of experience in the field of electronics. He has written several books on electronics, including "Principles of Electronic Communication Systems" and "The Electronics Companion: Devices and Circuits for Physicists and Engineers."

"Principles of Electronic Communication Systems" is a comprehensive guide to the fundamentals of modern electronic communication systems. The book covers topics such as signals, modulation, demodulation, noise, transmission lines, antennas, and more. It also provides an overview of digital communication systems, including digital modulation techniques, error control coding, and multiple access techniques.

The book is written in a clear and concise manner, with many practical examples and diagrams to illustrate the concepts. It is designed for students and professionals in the field of electronics who want to gain a thorough understanding of communication systems.

In "The Electronics Companion: Devices and Circuits for Physicists and Engineers," Frenzel provides an overview of electronic devices and circuits, with a focus on the physics behind their operation. The book covers topics such as diodes, transistors, amplifiers, operational amplifiers, digital logic circuits, and more.

The book is written in a conversational tone, with many practical examples and diagrams to illustrate the concepts. It is designed for physicists and engineers who want to gain a deeper understanding of electronic devices and circuits.

Overall, Frenzel's books are highly recommended for anyone interested in the field of electronics. They provide a comprehensive overview of the fundamental concepts, with practical examples and diagrams to illustrate the concepts. They are also written in a clear and concise manner, making them accessible to students and professionals alike.