Engineering: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:
[math]\displaystyle{ a_{RWG}=a_{SIW}-1.08(2r)^2/p + 0.1 (2r)^2/a_{SIW} }[/math]
where [math]\displaystyle{ p }[/math] is the distance between the posts in the post wall, [math]\displaystyle{ r }[/math] describes the radius, and [math]\displaystyle{ a_{RWG} }[/math] as well as [math]\displaystyle{ a_{SIW} }[/math] are the widths of the rectangular waveguide and SIW respectively.
See also
- Planar transmission line § Substrate integrated waveguide, also
- Ke Wu, inventor
External links
- siwspace.com – A web on Substrate integrated waveguide
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