Microstrip-To-Waveguide transition

[Lottarn]

Hello everyone!

I'm currently working on a bachelor thesis, where I am going to design Microstrip-To-Waveguide transition. Right now I'm working with a rectangular waveguide - WR12. However, as seen in the pictures that I've posted, the microstrip consists of 2 WR, one on the upper side and downside. My question is that in order to backshort my WR on the upperside, should I assign a perfect E boundary?

Also, in order to connect these to WR, I have to implement via holes, but this will for sure increase my simulation time, is there another easy way to connect these to WR?

Thanks in advance!

 

[PlanarMetamaterials]

Hi Lottarn,

Do you mean microstrip, or CPW? If the copper-ish color in your pictures represents metal, this looks more like a CPW line.

Yes, a perfect E boundary will short out the waveguide.

A few vias shouldn't add much to simulation time in HFSS, I wouldn't be too worried about them.

Good luck!

 

[Lottarn]

Thank you for the answer!

Should I insert a box on top of the WR on upperside and thereafter assign the box to perfect E?

Regards

 

[PlanarMetamaterials]

Should I insert a box on top of the WR on upperside and thereafter assign the box to perfect E?

Yes, either a volumetric box (the preferred option), or a sheet would work. You could also make it some metal such as brass for enhanced accuracy.