Figure 1 from A 210 GHz Dual-Gate FET Mixer MMIC With ${>}$2 dB Conversion Gain, High LO-to-RF Isolation, and Low LO-Drive Requirements | Semantic Scholar
70MHz (4meters band) Converter to 10meters band using the Dual-Gate Mosfet BF961 - YouTube
Dual gate MOSFETs in audio path | diyAudio
Fundamentals of Solid-State Receivers, February 1972 Popular Electronics - RF Cafe