Compare the concept of Frequency Selective Surfaces (FSS) (blocks and/or reflects some frequencies, lets others through) to the concept of Impedance (blocks and/or reflects some types of electrical signal, lets others through) in Electrical Engineering:

https://en.wikipedia.org/wiki/Electrical_impedance

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Related:

https://en.wikipedia.org/wiki/Frequency_selective_surface

Frequency Selective Surfaces: A Review:

https://www.mdpi.com/2076-3417/8/9/1689

Google image search, "Frequency Selective Surface":

https://www.google.com/search?q=frequency+selective+surface&...

"Frequency Selective Surface" books:

https://www.amazon.com/s?k=frequency+selective+surface