BL Smith Chief Technical Writer, Thomson-CSF
6.2 Thermionics, Power Grid and Linear Beam Tubes
The first requirement for working in the microwave domain is a microwave source. Only when quasi-monochromatic sources began to appear in the 1930s, did microwave operations become possible.
6.2.1 Thermionic Tubes
These sources were microwave tubes, and they are still with us in spite of the appearance in the 1960s of solid-state microwave sources. Tubes are by far the most powerful sources, especially at the highest frequencies of the microwave spectrum (up to 1 THz). If only for this reason, microwave tubes are here to stay for a long time.
6.2.1.1 Common principles
6.2.1.1.1 Difficulties at high frequencies
The earliest radio frequency tubes ...
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