Electromagnetic waves are generated when charged particles that are moving through a conductor experience acceleration. This may seem like a rather dull scientific statement, but engineers have transformed this phenomenon into a means of utterly transforming human life. From the first successful radio transmissions of the 1890s to the sophisticated digital modulation systems of the twenty-first century, wireless communication has been an important and enduring manifestation of our relentless improvements in electronic technology. Furthermore, what was once found primarily in specialized applications has expanded into almost every aspect of our daily lives; radio-frequency communication has truly become an ubiquitous feature of modern society. It is often difficult for us to imagine how people ever survived without cell phones, GPS systems, and wireless Internet access!
The analysis and design of radio-frequency (RF) circuits can be quite complex, and real-life RF devices often behave in ways that are difficult to predict. Nonetheless, many important aspects of radio-frequency communication systems are within the reach of dedicated students and engineers who have already studied electronics and electrical signals. Volume VII of the AAC textbook takes you on a gradual journey through RF communication. It emphasizes foundational concepts and techniques rather than mathematical details and complex analytical procedures, and it gives you the information that you need to continue with advanced studies and practical experience in RF design.