To meet telecommunications demands of the world community, it is crucial to employ radio services. Among vast and fast expansions during recent decades, the satellite services, navigational aids, remote sensing, telemetering, audio and video broadcasting, high-speed data communications, mobile radio systems, and some other special radio services may be addressed.

Radiowaves, propagating between the transmitter and receiver antennas, are subject to a number of phenomena which should be studied and differentiated carefully for designing a reliable radio link. Engineering of radiowave propagation as an outstanding and highly specialized issue is required for all types of radio communications. The pressure to provide data for more effective use of the frequency spectrum, as a natural and limited source of radio systems, requires wider improved prediction methods specially for new bands.

The subject of radiowave propagation is now too large to be treated in a single volume book, encompassing all theoretical and practical aspects. The purpose of this book is to deal in brief with the basic principles needed for understanding of radiowave propagation for common frequency bands used in radio communications.

It includes descriptions of new achievements and newly developed propagation models. The provided materials are intended to bridge the gap between theoretical calculations and approaches and applied procedures needed for radio link design in a proper manner.