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Advantages of SIW | Disadvantages of SIW | Substrate Integrated Waveguide

This page covers advantages and disadvantages of SIW or Substrate Integrated Waveguide. It mentions SIW (Substrate Integrated Waveguide) advantages and Substrate Integrated Waveguide (SIW) disadvantages.

What is SIW:
The structure as shown in the figure is known as SIW or Substrate Integrated Waveguide. It consists of three layers viz. top and bottom ground planes and dielectric layer in between these two planes. Metallic via array of holes is placed between these two planes as shown.

SIW-Substrate Integrated Waveguide

The microwave devices such as filters, antenna arrays, power dividers, directional couplers, phase shifters, couplers, transitions etc. are designed and manufactured using SIW structures due to its several benefits (i.e. advantages).

Advantages of SIW or Substrate Integrated Waveguide

Following are the advantages of SIW (Substrate Integrated Waveguide):
➨Power handling capabilities are higher.
➨Radiation losses are lower.
➨Fabrication cost of various rf components using SIW structure is lower.
➨High density integrattion can be achieved in mountation of discrete components on SIW structures.
➨Due to use of metal, conductor loss is lower.

Disadvantages of SIW or Substrate Integrated Waveguide

Following are the disadvantages of SIW (Substrate Integrated Waveguide):
➨Leakage losses are substantial which depends on separation of via holes placed on the top planes.
➨Due to use of dielectric into the waveguide structure, dielectric losses will occur compare to air used in normal rectangular waveguide. Moreover it depends on frequency and hence mm wave (millimeter wave) applications of SIW need to be carefully considered.
➨Due to its waveguide structure, SIW exhibits cutoff frequency of lower values.

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