Meta Materials are materials that exhibit non-traditional physical properties and can be very useful for specific applications :
https://en.wikipedia.org/wiki/Metamaterial
There is a sub group of new 3D printing that is taking advantage of this to create Meta Material Antennas :
https://en.wikipedia.org/wiki/Metamaterial_antenna
An even more obscure sub group of that is involving Non-Linear Meta Materials :
https://en.wikipedia.org/wiki/Nonlinear_metamaterial
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