Waffle-iron filter

A waffle-iron filter is a type of waveguide filter used at microwave frequencies for signal filtering. It is a variation of the corrugated-waveguide filter but with longitudinal slots cut through the corrugations resulting in an internal structure that has the appearance of a waffle-iron. Waffle-iron filters are particularly suitable where both a ...
Found on http://en.wikipedia.org/wiki/Waffle-iron_filter
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