Conclusion
It was demonstrated that approaches towards oscillators with sufficient noise performance familiar up to frequencies of 100 GHz can be applied at 140 GHz with only minor modifications.
Mostly due to the limitations imposed by the available InP Gunn diodes the power levels reached with second harmonic mode operation were less than at 94 GHz with GaAs devices. The two approaches employing IMPATT diodes deliver substantial output power at D-band. Which one is preferrable will be dependent on the application.
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Essen, H., Wennerscheid, E. Low noise oscillator approaches at 140 GHz. Int J Infrared Milli Waves 8, 119–124 (1987). https://doi.org/10.1007/BF01012548
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DOI: https://doi.org/10.1007/BF01012548