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:

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

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.

External links

• siwspace.com – A web on Substrate integrated waveguide