A group of scientists from the University of Minnesota have developed a new type of bandpass filter made of proteins. This filter is capable of selectively separating out certain frequencies of electromagnetic waves, allowing only a certain range of frequencies to pass through. This could be a major breakthrough in the development of a wide range of new technologies, from improved wireless communication to medical imaging. The filter works by using a combination of two proteins, one of which blocks certain frequencies while the other allows them through. By adjusting the concentration of the two proteins, the scientists were able to create a filter that could selectively separate out only the desired frequencies. This technology could revolutionize the way we use and communicate with electromagnetic waves.

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source: Phys.org