Hackers' Pub

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Dave Anderson @danderson@hachyderm.io

6/4/2025, 6:28:55 PM

Public

TIL YIG filters (Yttrium Iron Garnet), which is used in microwave RF filters to make a pass-band that sits north of 3GHz.

This does _nothing_ to dispel the notion that RF engineering is just modern alchemical bullshit. Look at this simplified representation of a YIG filter on wikipedia. Oh yeah, you pass two microstrips at an angle near a mysterious Sphere Of Filtering, and its ravenous maw consumes the 0-3GHz frequencies to feed its demonic ambitions. But sure yeah, enjoy your filtered signal.

A simplified representation of a YIG microwave filter. Two strips of copper cross at a right angle. At the crossing sits a sphere of a magical crystal, which the traces skirt around without touching. This, apparently, becomes an RF filter at microwave frequencies.

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