Foreword

Development of devices for filtering and spectral processing of radio signals has an exceptional influence on modern radio engineering systems, since they largely determine their technical characteristics and the efficiency of using the frequency resource. They provide possibility to select useful radio signals against the background of natural and artificial interference and other types of interfere influences, to perform real-time analysis of signal parameters. Improvement of effective filters and spectral analysis devices is one of the fundamental tasks in the design of modern radio engineering systems. The significant part of the book is devoted to devices for filtering and spectral analysis of radio signals on surface and bulk acoustic waves. In addition, the common directions of improving surface acoustic waves filters are considered.

In most cases, the ultimate goal of various applications of radio signals spectral processing is frequency selection and frequency measurement of signals. This book as a whole is devoted to solving not only this urgent and complex problem, but it also presents original methods of frequency selection and frequency measurements.

The materials of the book are very useful in the process of mastering modern technologies for communication systems and spectral analysis element base. In particular, it presents the results of mathematical modeling and experimental studies of waveguide microwave filters and output multiplexers of space communication systems made on rectangular and circular waveguides. The processes of electromagnetic waves scattering in metal frequency-selective structures are also studied. Finally, the monograph examines new principles for designing compact microstrip filters with increased frequency selectivity. Such wide range of issues will be interesting to students, experts and scientists who are engaged in development and design of filters and other microwave devices.