MMW isolators incorporate internal magnets to align the magnetic dipoles in the ferrite core and achieve Faraday rotation of the signal. Because our isolators use a saturated magnetic bias field, they are insensitive to stray magnetic fields from external sources such as those arising from other nearby ferrite devices. In contrast, traditional style isolators manufactured by other vendors are highly sensitive to stray magnetic fields. The sensitivity is caused by the fact that the magnetic bias point lies on the steep part of the magnetization curve. This is just one more reason to choose Micro Harmonics isolators.