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12
Microwave Tubes
12.1 Introduction
The classication of microwave tubes was briey discussed in Chapter 11.
This chapter describes some of the most commonly used tubes. To assess
their strength and weakness relating to the generation and amplication of
signals, this chapter includes their constructional features, working princi-
ples and performance parameters.
12.2 Klystron
The word klystron is derived from a Greek word that means to wash or
break over, such as waves wash a beach. Although invented in 1937 by the
Varian brothers, it is still widely used. It nds applications in radars and
communication equipment as an oscil