The terahertz mixer is a very important device in the terahertz application field. It usually converts the terahertz high frequency band signal down to the low frequency band to realize the spectrum shift

or converts the low frequency band signal up to the high frequency band to realize the spectrum shift. Schottky diode terahertz mixers are an important type of mixers. The study of this type of mixers has potential value for promoting the development of terahertz technology and terahertz mixers. Development of Schottky diodes and the development of schottky diodes terahertz mixers are introduced

the common application scenarios of such devices are summarized

and the research difficulties and future development directions are summarized.