waveguide to microstrip transition problem in HFSS

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oahsen

Joined: 30 Sep 2008
Posts: 12

19 Jun 2009 12:44 waveguide to microstrip transition

hi,

i am trying to design a simple waveguide to microstrip probe transition using HFSS. i have a WR-22 waveguide and the substrate for the transition is Duroid-6002. When I draw the geometry and put a probe i get about -120dB insertion loss. The design parameters (width of the probe,air gap etc. ) are arbitrary, so i dont expect very small insertion loss, however, -120dB is way too high?

I am a beginner at the usage of HFSS, therefore, I think that probably there is something wrong with the exications, boundaries etc. Could somebody check whether there is an error in the schematic. I am attaching the HFSS file. Thanks in advance..

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oahsen

Joined: 30 Sep 2008
Posts: 12

23 Jun 2009 14:45 hfss waveguide to microstrip

help will be very appreciated guys Crying or Very sad

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romka-04

Joined: 05 Jun 2007
Posts: 13
Helped: 2

23 Jun 2009 22:17 microstrip transition hfss

oahsen wrote:

help will be very appreciated guys Crying or Very sad

Hi!
You should be more careful or learn more about HFSS! Smile

The surface of the cavity in the WG is perfect conductor! Use the HFSS->Boundary display in the menu to see it.
Fill the cavity by vacuum and do the microstrip line longer!