Substrate-integrated waveguide
Post-wall waveguide structure is also called a substrate integrated waveguide(SIW) or a laminated waveguide. A post-wall waveguide is a synthetic rectangular 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 throuhg-hole technique 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.