At those kind of frequencies (and way higher), devices like oscillators, mixers and amplifiers (FETs) are typically fabricated on Gallium Nitride (GaN) or Galli

At those kind of frequencies (and way higher), devices like oscillators, mixers and amplifiers (FETs) are typically fabricated on Gallium Nitride (GaN) or Gallium Arsenide (GaAs) substrates.