Backward diodes, tunnel diodes have been successfully operated as detectors, mixers at microwave frequencies. The extension of their usage from microwave frequencies to millimeter wave frequencies is a natural outgrowth of earlier work.
No takes yet. Share an insight, caveat, or question.
Chase et al. (1963) studied this question.
Synapse has enriched 4 closely related papers on similar clinical questions. Consider them for comparative context: