Yttrium iron garnet filter

Yttrium iron garnet filter

Yttrium iron garnet filter (YIG filter) is a magnetically tunable filter for microwave frequencies. YIG spheres are used for their high Q factors.

YIG filters use a synthetic single crystal yttrium iron garnet sphere acting as a resonator, providing a high Q factors. The garnet is mounted on a ceramic rod, and small loops around the sphere couple fields into and out of the sphere. 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 method is that the garnet can be tuned over a very wide frequency by varying the strength of the magnetic field; some filters can be tuned from 3 GHz up to 50 GHz. YIG filters usually consist of several coupled stages, each stage consisting of a sphere and a pair of loops.

The input and output coils are oriented at right angles to one another around the YIG crystal. They are cross-coupled when energised by the ferrimagnetic resonance frequency, which depends on the external magnetic field, supplied by the electromagnet.

YIG filters are often used as preselectors. YIG filters tuned by a sweep current are used in spectrum analyzers.

Another application of YIG is a tunable oscillator, the YIG oscillator, where the sphere acts as the frequency-determining resonator and is coupled to a transistor that provides the required feedback for the oscillation.

External links

* [http://www.alfamicroonde.com/pdf%20files/ytfdefinitions2.pdf Micro Lambda Wireless Inc.: YIG tuned filters technology description]

References

J. Helszajn, "YIG Resonators and Filters," John Wiley & Sons (New York: 1985)


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  • Yttrium iron garnet — (YIG) is a kind of synthetic garnet, with chemical composition Yttrium3Iron2(FeOxygen4)3, or Y3Fe5O12. It is a ferrimagnetic material with Curie temperature 550 K.In YIG, the five iron(III) ions occupy two octahedral and three tetrahedral sites,… …   Wikipedia

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  • Electronic filter — Electronic filters are electronic circuits which perform signal processing functions, specifically intended to remove unwanted signal components and/or enhance wanted ones. Electronic filters can be:*passive or active *analog or digital *discrete …   Wikipedia

  • YIGF — abbr. Yttrium Iron Garnet Filter …   Dictionary of abbreviations

  • YIG — Yttrium Eisen Granat Bild eventuell bei Commons Chemische Formel Y3Fe2(FeO4)3 oder Y3Fe5O12 Mineralklasse Granatgruppe Kristallsystem kubisch Kristallklasse …   Deutsch Wikipedia

  • YIG — ˈyig noun ( s) Etymology: yttrium iron garnet : a synthetic yttrium iron garnet having ferrimagnetic properties that is used especially as a filter for selecting or tuning microwaves * * * /yig/, n. a synthetic yttrium iron garnet, used in… …   Useful english dictionary

  • YIG —   [Abkürzung für englisch Yttrium iron garnet »Yttrium Eisen Granat«], in der Struktur dem YAG ähnliches Mischoxid, Y3Fe5O12. YIG Kristalle werden unter Ausnutzung der gyromagnetischen Resonanz im Mikrowellenbereich als frequenzbestimmende… …   Universal-Lexikon

  • YTF — Youth for Technology Foundation (Community) *** Youth Task Force (Community) * Alma, Quebec, Canada (Regional » Airport Codes) * YIG (Yttrium Iron Garnet) Tuned Filter (Academic & Science » Electronics) …   Abbreviations dictionary

  • Neodymium — praseodymium ← neodymium → promethium ↑ Nd ↓ U …   Wikipedia

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