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Title: Walls that can be tuned

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Subject: Technology
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Date: January 14, 1997
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Length: 7 / 1837
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You must have noticed a periodic structure of hexagons or circles on the front glass. This is, in fact, an FSS which stops the microwave frequency to come out of the oven, since it is harmful to human beings. How and why do geometric shapes make an FSS act as a band pass or band stop filter? Well, it is very simple...

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It can easily be seen that when an incident wave impinges on this structure, a small current flows in the material (mostly made up of copper) making it an equivalent series LC circuit (L= Inductor, C= Capacitor). Inductance is in the arms of each cross and capacitance in between the adjacent edges due to currents produced in the structure as incident electromagnetic waves strike, as shown in the figure...

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