DC power is converted directly into microwave energy by an IMPATT diode. In X-band, these devices generate higher CW power than any other present-day, solid-state microwave source, clearing the way for new cost-sensitive microwave designs. By A. M. Cowley MICROWAVE POWER GENERATION has been the last major holdout against the solid-state revolution. The smaller size, longer life, and lower power consumption of solidstate circuits could make a host of startling developments possible but, just as vacuum tube designers reached a frequency ceiling with grid-controlled vacuum tubes, solid-state designers are faced with an apparent limit to the capabilities of transistors. Yet, just as vacuum-tube designers succeeded in generating microwave power us ing new concepts in electron beam control, solid-stat
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