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<p>media.  This technique uses the <a href="page.php?w=Boundary_element_method">method of moments</a> (MoM) in combination with a <a href="page.php?w=Bloch_wave">Bloch wave</a> expansion of the electromagnetic field to yield a matrix eigenvalue equation for the propagation bands.  The eigenvalue is the frequency (for a given propagation constant) and the eigenvector is the set of current amplitudes on the surface of the scatterers.  Bloch wave - MoM is similar in principle to the <a href="page.php?w=plane_wave_expansion_method">plane wave expansion method</a>,</p><p>
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