| 摘要 |
A device substantially transparent to electromagnetic radiation of a certain frequency band is presented. The device comprises at least one dielectric structure formed with a predetermined substantially periodic inner pattern composed of a two-dimensional array of spaced-apart substantially identical elements made of an electrically conducting material and capable of scattering said electromagnetic radiation. The elements are disconnected from each other, each having a size smaller than that of a resonance condition of the array of such elements - typically less than half the wavelength of the radiation to be passed. The device may be sandwiched between layers of dielectric sheets, or between ferroelectric layers. If ferroelectric layers are used, application of an electric field allows the pass-band to be changed. The device may be used in radomes.
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