The development of radar during World War II provided much of the microwave technology which made practical microwave communication links possible, particularly the klystron oscillator and techniques of designing parabolic antennas.
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Shortly after the Second World War, Bak traveled to Berkeley, California ( 1946 47 ) where he in collaboration with W . D . Gwinn built the first microwave spectrograph, an instrument that could be realized thanks to components developed originally for use in advanced war-time radar systems ( Klystron oscillator ).
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