Yttrium Iron Garnet (YIG) is a synthetic crystal that offers very high Q characteristics. (Learn more about Q factor in this wiki post: https://en.wikipedia.org/wiki/Q_factor ). This high Q provides the lowest phase noise performance in oscillators, and the most optimal multi-octave frequency tuning in both oscillators and filters. YIG crystals are “grown”, like silicon crystals. The ...

1. YIG RF Bandpass Filters: In an RF bandpass filter, the coupling loops are aligned at a 90° angle to prevent direct RF coupling. One end of each loop is grounded. This prevents the filtered signal from being reflected. The RF input signal of the coupling loop modulates the magnetic field around the YIG sphere, this modulation is coupled to the magnetic field resonating around the YIG sphere, ...