The book "Straight-angle waveguides with dielectrics: a guide" by Berger and Kapilevich is a unique publication that will become a real discovery for specialists in the field of radio engineering, electronics and optics. This reference guide offers readers a deep and systematic understanding of the theory and practice of rectangular waveguides, making it an indispensable tool for engineers, students, and researchers. From the first pages of the book, the authors immerse the reader in the world of waveguides, explaining what rectangular waveguides are and how they are used in modern technologies. The book covers a wide range of topics, including physical foundations, mathematical models, and practical applications. The reader will be able to learn about how waveguides can be used to transmit electromagnetic waves, as well as the influence of dielectrics on their characteristics. This makes the publication especially valuable for those who work with high-frequency devices and communication systems. Who can like this book? First of all, it will be of interest to students and graduate students of technical specialties studying radiophysics and electronics . Engineers involved in the design and development of new technologies will also find a lot of useful information in it. In addition, the book can be useful to researchers working in the field of optics and photonics, as well as to anyone interested in new developments in the field of signal transmission. One of the key topics raised in the book is the influence of dielectrics on the characteristics of waveguides. The authors examine in detail how different materials can change transmission parameters, as well as how this knowledge can be applied in practice. This allows the reader not only to understand the theoretical aspects, but also to learn how to apply them in real conditions. The book also includes many examples and tasks, making it an ideal guide for self-study. The style of the authors is clear and accessible. Berger and Kapilevich skillfully combine theoretical calculations with practical examples, which allows the reader to easily absorb material. Their previous work has also received recognition in the scientific community, and this guide was no exception. Readers familiar with other authors' works will appreciate their ability to explain complex concepts in a simple and understandable language. The book "Straight-angle waveguides with dielectrics: a guide" is not just a textbook, but a real find for everyone who seeks to deepen their knowledge in the field of waveguides and dielectrics. It will become a reliable assistant for both novice specialists and experienced engineers who want to update their knowledge and master new technologies. If you are looking for high-quality literature on radio, electronics or optics, this publication should definitely take its rightful place on your shelf. Do not miss the opportunity to expand your horizons and deepen your understanding of waveguides with this unique guide