Electromagnetic Bandgap (EBG) and SIW

[Lathas]

What is the difference between electromagnetic bandgap(EBG) and Substrate integrated Waveguide (SIW)?

 

[PlanarMetamaterials]

What is the difference between electromagnetic bandgap(EBG) and Substrate integrated Waveguide (SIW)?

Everything. An EBG is a device which suppress the propagation of power. SIW is a waveguide, which is designed to allow power to propagate.

 

[Lathas]

In one perspective that is right. But what I understand is that EBG suppress the propagation and confine it to region in between to form SIW? Refer to the paper: Hill, Michael J., Richard W. Ziolkowski, and John Papapolymerou. "A high-Q reconfigurable planar EBG cavity resonator." Microwave and Wireless Components Letters, IEEE 11.6 (2001): 255-257. This paper describes the configuration as EBG cavity, and for me it looks like SIW too, so why two different terms?

 

[PlanarMetamaterials]

An EBG can be created by loading a SIW (although in the paper's case, there is no SIW. The medium is simply a 2D arrangement of vias in a PPW).

Making a chair out of wood does not mean a chair is the same thing as wood.

 

[Lathas]

EBG is explained with graphs in **broken link removed**. What you discussed above is clearer now. Thanks!

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Can EBG substrate be considered a metamaterial?

 

[PlanarMetamaterials]

Can EBG substrate be considered a metamaterial?

Sure. There are a few conditions for something to be considered a metamaterial (which are ignored by most researchers, who use the term "metamaterial" to describe just about anything), such as:

- The unit cells operate under the effective-medium limit. This means that the the cells are electrically small (e.g. under a tenth of a wavelength at the highest operating frequency).
- There are multiple cells in the direction of propagation (otherwise it may be a metasurface).
- You can actually describe the material's response to a given mode in terms of effective permeability and permittivity.