SIW Mode | Substrate Integrated Waveguides Mode

This page mentions SIW mode (Substrate Integrated Waveguides Mode). As TM mode does not exist, SIW uses TE10 as dominant mode. SIW is the short form of Substrate Integrated Waveguides Mode.

The SIW structure is shown in the figure-1 below along with EM waves. It is similar to rectangular waveguide. It has three layers viz. top and bottom planes are grounded while the middle one is dielectric. The via holes are made at the sidewalls from top to bottom.

SIW mode, Substrate Integrated Waveguides mode

As there are via holes, TM (Transverse Magnetic) mode does not exist. TE10 mode exists in the SIW (Substrate Integrated Waveguides Mode). TE is the short form of Transverse Electric Wave mode.

In TE mode E field is wholly transverse to the waveguide i.e. E-field is perpendicular to the broad dimension of SIW. Following equation-1 used as generic equation for cutoff frequency calculation in rectangular waveguide.

rectangular waveguide cut off frequency

TE10 is used as dominant mode in SIW (Substrate Integrated Waveguide) Mode. By putting m equals 1 and n equals 0 in equation-1 we will get equation-1 as follows.

rectangular waveguide cut off frequency fig2

The equation-2 is used to calculate cutoff frequency of SIW. Refer rectangular waveguide calculator>> and rectangular waveguide vs circular waveguide>> for more information on rectangular waveguide.

SIW | Substrate Integrated Waveguide Related

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What is Difference between

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