Post-wall waveguide

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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:

a_{RWG}=a_{SIW}-1.08(2r)^2/p + 0.1 (2r)^2/a_{SIW}

where  p is the distance between the posts in the post wall,  r describes the radius, and   a_{RWG} as well as  a_{SIW} are the widths of the rectangular waveguide, resp. SIW.

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