17 dB is not bad for an isolator, but it's not good either. But this kind of just begs the question by using frequency mixers as the non-reciprocal element beca

17 dB is not bad for an isolator, but it's not good either. But this kind of just begs the question by using frequency mixers as the non-reciprocal element because frequency mixers are such lower power devices. I guess this helps for really lower power science stuff, but not so much communications. Still, very cool! The only other non-magnetic non-reciprocal RF elements I can think of used angular-momentum bias.