Yttrium Iron Garnet (YIG) Spheres serve as Magnetically Tuneable Filters for Microwave Frequencies. These Filters are used for their high Q factors. A Sphere made from a single crystal of synthetic Yttrium Iron Garnet acts as a Resonator. The Garnet is mounted on a ceramic rod and a pair of small loops around the sphere couple fields into and out of the sphere. The loops are half-turns, positioned at right-angles to each other to prevent direct electromagnetic coupling between them and each grounded at one end.
The field from an Electromagnet changes the resonance frequency of the Sphere and hence the frequency it will allow to pass. The advantage of this type of filter is that the Garnet can be tuned over a very wide frequency range by varying the strength of the magnetic field. Some Filters can be tuned up to 50 GHz. YIG Filters usually consist of several coupled stages, each stage consisting of a sphere and a pair of loops.
YIG Filters are often used as pre-selectors. YIG Filters tuned by a sweep current have a multitude of applications, with a common application being in Spectrum Analysers.
Accutronics represents the following manufacturers of YIG Products:
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