Not quite: "As a result, the new filter can be tuned to any frequency between 3.4 GHz and 11.1 GHz..."
The 600 MHz to 6 GHz referred to currently used communication frequencies.
The 600 MHz to 6 GHz referred to currently used communication frequencies.
More critically: you want to be very very careful about trying to extrapolate this filter down to lower frequencies. We're dealing with "weird physics" here. I am not an expert on spin-wave devices by any means, but a guy in my lab during grad school was working with them, so I do know that the resonant frequencies of the spin-waves are a function of the magnetic bias and the material. The researchers here are tuning the filter by tuning the magnetic bias. Someone more knowledgeable can correct me, but I believe YIG would have trouble propagating spin-waves down at 600 MHz, and so this kind of filter would not be practical.