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Riddik
Joined: 25 Dec 2007
Posts: 4
Location: Ukraine
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 25 Dec 2007 16:24 I have a question for my project (HFSS v11) |
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Hi all. There is my project in attachment. This is a coax-waveguide junction. In practice it SWR is 1.1 in 10.5 - 10.65 GHz band. But, when I build model of this junction SWR is very bad. I'm a beginner in use of HFSS. Tell me, please, in detail, where is my mistake? Thank you very much for your helping!!!
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Riddik
Joined: 25 Dec 2007
Posts: 4
Location: Ukraine
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29 Dec 2007 8:04 I have a question for my project (HFSS v11) |
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| Can anybody help me?
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rfmw
Joined: 10 May 2001
Posts: 520
Helped: 38
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31 Dec 2007 18:23 Re: I have a question for my project (HFSS v11) |
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| I simulated your project. Indeed the S11 gets only to about -6dB. I've tried to improve the meshing around the feed but the return loss did not improve. Are you sure that your built device and model are really the same?
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Riddik
Joined: 25 Dec 2007
Posts: 4
Location: Ukraine
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02 Jan 2008 13:13 Re: I have a question for my project (HFSS v11) |
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| rfmw wrote: |
| I simulated your project. Indeed the S11 gets only to about -6dB. I've tried to improve the meshing around the feed but the return loss did not improve. Are you sure that your built device and model are really the same? |
Certainly, I've built my model for that graphics, which is really work, but, I'm a beginner in HFSS, may be I did mistake in this program, can verify it?
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02 Jan 2008 13:13 Ads |
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rfmw
Joined: 10 May 2001
Posts: 520
Helped: 38
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02 Jan 2008 15:17 Re: I have a question for my project (HFSS v11) |
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Actually, I think that you've set the hfss correctly. Practically I did no modifications to your hfss file, but I'm not an expert myself 
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navuho
Joined: 05 Jun 2001
Posts: 110
Helped: 14
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04 Jan 2008 22:11 Re: I have a question for my project (HFSS v11) |
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| Riddik wrote: |
| This is a coax-waveguide junction. In practice it SWR is 1.1 in 10.5 - 10.65 GHz band. But, when I build model of this junction SWR is very bad. |
You HFSS model looks as unmatched. At least the distance to back wall should be around l/4 , while in your drawings it's about l/3. The distance from the waveguide bottom to matching cylinder looks to much as well.
Then the coaxial with glass filling. Are you shure that you are using exact one with eps=5.5 ? I never seen the rf coaxial cable with glass filling.
And you don't need to simulate full geometry, cut it by ZX plane and assign PerfectH boundary.
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