Abstract
When a signal at the frequency f S and a local oscillator at the frequency f L are both applied, a high T C Josephson junction can be operated as a harmonic mixer to give rise to output at the intermediate frequency f IF=≈ f S-nf L ≈ where n is an integer called harmonic number. Good results have so far been demonstrated for f S up to about 100 GHz and n up to about 120. The laboratory application of such mixing to the phase locking of signal source at millimeter waveband has also been explored. Further attempts to push the operating frequency to submillimeter and far infrared wavebands are being made.
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