1. A wave control medium comprising at least two three-dimensional microstructures in combination, each of the three-dimensional microstructures including any one of a metal, a dielectric material, a magnetic material, a semiconductor, and a superconductor, or a material selected from a plurality of combinations of a metal, a dielectric material, a magnetic material, a semiconductor, and a superconductor, the wave control medium having functions of a capacitor and an inductor, wherein a distance of the wave control medium in a longitudinal direction is less than 1/10 of a wavelength of a wave, and a fractional bandwidth of a response is 30% or more.
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