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Microwaves are radio waves with a frequency from 300MHz to 300GHz which corresponds to a wavelength of one meter down to one millimeter. Often in RF engineering however it is used to refer to a narrower region such as 1 to 100GHz.

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What is this microwave component?

Recently I took apart a microwave and desoldered most of the the components from it. I have never seen one of these (picture) before. What is this and what does it do? …
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