In
the PBG engineering it is a conventional rule to use Bragg’s condition [13] to
calculate the central stopband frequency provided by PBGSs.
Under this condition,
inter-cell separation (known as period) is approximately equal to half
wavelength of the stopband central frequency. From the inter-cell separation,
the size of the PBG element is calculated on the basis of FF.
The
center frequency of the stopband is calculated approximately with the following
expression:
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