Post wall

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 through-hole techniques for low-cost and mass-production. 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:

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

</math>

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

de:Substrate Integrated Waveguide