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[–] superkuh [S] 0 points 0 points (+0|-0) ago  (edited ago)

This is pretty big news. They've partnered with MiniCircuits to mass produce these types of filters and are going to be selling them commercially soon. It means you can combine filter elements back to back without worrying about weird resonances. So you can make a bandstop simple by putting a high pass and low pass together with a freq gap in their cut-offs. The future is bright.

edit, add technical references:

Combining MMIC Reflectionless Filters to Create UWB Bandpass Filters (Microwave Journal Article)

https://arxiv.org/pdf/1407.7825

https://arxiv.org/pdf/1008.3502