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loginThe purpose of this introductory chapter is to provide a short, and admit-tedly incomplete, survey of what the microwave engineering field encom-passes. Section 1.2 presents a brief discussion of many of the varied and sometimes unique applications of microwaves. This is followed by a third section in which an attempt is made to show in what ways microwave engineering differs from the engineering of communication systems at lower frequencies. In addition, a number of microwave devices are introduced to provide examples of the types of devices and circuit elements that are examined in greater detail later on in the text.