Magnetron, a cheap and simple way to create power microwave source

Context

Magnetrons are widely used as RF power sources because they offer high energy conversion efficiency (around 75%) at a low cost. The magnetron was invented during World War II, when its small size, high power and short wavelength made it ideal for use in radar, but with mass production and the development of automatic manufacturing techniques, magnetrons made the move into the home as the radiation source in microwave ovens.

a) a microwave oven making use of magnetron as electromagnetic source

b) what a magnetron looks like

b) what a magnetron looks like

Fig. 1

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