1. https://en.wikipedia.org/wiki/Circulator
2. http://web.stanford.edu/~skatti/pubs/sigcomm13-fullduplex.pd...
Can any RF engineers comment on this?
They neglected to mention the power level they used to measure the S-parameters in the letter or the supplementary material. No self-respecting RF engineer would forget to mention power levels - it again hints at very poor linearity / poor power handling. Typical university "research".
http://www.nature.com/nphys/journal/vaop/ncurrent/full/nphys...