Doppler effect based mixer for microwave frequency

@article{Ran2017DopplerEB,
  title={Doppler effect based mixer for microwave frequency},
  author={Jia Ran and Yewen Zhang and Xiaodong Chen and Hong Chen},
  journal={2017 11th International Congress on Engineered Materials Platforms for Novel Wave Phenomena (Metamaterials)},
  year={2017},
  pages={280-282}
}
We proposed a novel Doppler effect based microwave frequency mixer which mixes the incident wave with its Doppler shifted signal, instead of a local oscillator. The Doppler shifted signal originates from an effective moving reflective surface built inside the mixer. This kind of mixer can be low-cost without local oscillators, meanwhile the intermediate frequency is tunable electronically.