This manual is a reference text for trainees and other personnel in the communications-electronics field. It provides information about wave propagation, transmission lines, and antennas. This manual also identifies important safety practices to follow when working with electromagnetic radiation. The methods used to propagate (transmit) waves through space are based on the same physical principles today as they were 70 years ago. In this chapter, we discuss propagation theory on an introductory level, without going into the technical details that concern the engineer. Understanding wave propagation requires you to use your imagination to visualize the associated concepts and how they are used in practical application. To help you in this process, this chapter includes many illustrations and step-by-step descriptions that guide you from simple concepts to more complex ideas.
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