A multiple signal conversion process has been observed in ferrimagnetic materials at microwave frequencies. The second harmonic of the input frequency is generated in a magnetized ferrite and caused to mix with the fundamental frequency in the specimen generating the harmonic. A portion of the upper side band power arising from mixing of the fundamental frequency and its second harmonic is constructively added to the third harmonic occurring from harmonic generation. The total output power at the third harmonic is consequently increased.
