The study of a rectangular waveguide and elements based on it: method. Decree. to perform lab. Work No1" by B. B. Kirilchuk is an indispensable tool for students and specialists interested in the field of radio engineering and electromagnetic waves. This publication offers a deep dive into the world of waveguides, their characteristics and applications, which makes it relevant for both beginners and more experienced readers. Waveguides are devices that direct electromagnetic waves, and their research opens the door to understanding a variety of modern technologies, from mobile communication to satellite data transmission. In his book, Kirilchuk not only explains the theoretical aspects of the work of rectangular waveguides, but also offers practical tasks that will help readers to consolidate the knowledge gained. Methodical instructions for performing laboratory work No. 1 make it possible not only to get acquainted with the theory, but also in practice to see how waveguides work, which makes the learning process more exciting and productive. The book will be of particular interest to students of technical specialties, graduate students and young professionals who seek to deepen their knowledge in the field of radio engineering, physics and electrical engineering .. It can also attract the attention of teachers who are looking for quality teaching materials for their courses. In. B. Kirilchuk certainly knows what he writes about: his experience and deep understanding of the subject allow him to create accessible and informative materials that are easily perceived. The topics raised in the book cover a wide range of issues, ranging from the foundations of waveguide theory to their practical application in various fields of science and technology. The author focuses on the importance of the experimental approach in the study of waveguides, which emphasizes the importance of practical experience in the educational process. This is especially true in the context of the rapid development of technology, when theoretical knowledge needs to be supported by practical skills. Kirilchuk's style is distinguished by clarity and logical presentation, which makes his books available to a wide audience. He skillfully combines theory with practice, which allows readers not only to assimilate the material, but also to apply it in real conditions. In. B. Kirilchuk is also known for his other work in the field of radio engineering, which continues to inspire students and professionals to study this fascinating discipline. If you are looking for a book that will help you understand the complex issues of radio engineering and give you the opportunity to learn waveguides in practice, “Researching a rectangular waveguide and elements based on it” will be an excellent choice. This work will not only expand your knowledge, but will also help develop skills that will be useful in a future career. Do not miss the chance to plunge into the world of electromagnetic waves and discover new horizons of science and technology!