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IMPATT diodes are two port devices with negative resistance. You can use them as amplifiers, or oscillators.
Patents at Raytheon during the late 1970s on Impatt transmitter
https://patents.justia.com/patent/4097821
Here's a Nasa report from 1985 on a 20W K-band transmitter
https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19870008556.pdf
Later, Quinstar worked on IMPATTs at W-band
https://sbirsource.com/sbir/awards/21566-w-band-short-pulse-impatt-diode-development
Author : Unknown Editor