| 摘要 |
There is disclosed a filter device 10 for electromagnetic radiation which is tunable across a wide range of the e-m spectrum, eg 30 GHz to 100 THz. The filter device 10 comprises at least two layers of material 6a-c; the layers 6a-c being spaced apart by a medium have a lower dielectric constant and/or electrical conductivity than a dielectric constant and/or electrical conductivity of the material; each layer 6a-c comprising a plurality of teeth 2,4 disposed in a substantially common plane; the layers 6a-c being stacked such that the teeth 2,4 of adjacent wafers interleave. The filter can be tuned for frequency of stopband, width of stop band, and the frequency of a narrow transmission peak.
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