Siwé

Siwé is an arrondissement in the Zou department of Benin. It is an administrative division under the jurisdiction of the commune of Agbangnizoun. According to the population census conducted by the Institut National de la Statistique Benin on February 15, 2002, the arrondissement had a total population of 5,508.

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Coordinates: 7°04′20″N 1°57′58″E / 7.0723°N 1.9660°E / 7.0723; 1.9660

Post-wall waveguide

A post-wall waveguide (also known as substrate integrated waveguide (SIW) or a laminated waveguide) is a synthetic rectangular electromagnetic waveguide formed in a dielectric substrate by densely arraying metallized posts or via-holes which connect the upper and lower metal plates of the substrate. The waveguide can be easily fabricated with low-cost and mass-production using through-hole techniques where the post walls consists of via fences. The post-wall waveguide is known to have similar guided wave and mode characteristics to the conventional rectangular waveguide with equivalent guided wavelength.

For instance, the equivalent width of a rectangular waveguide compared to a SIW is described in the approximation:

where is the distance between the posts in the post wall, describes the radius, and as well as are the widths of the rectangular waveguide, resp. SIW.

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