| Author |
Message |
kumagai
Joined: 30 Mar 2007
Posts: 117
|
 13 Nov 2008 7:38 rectangular waveguide to coax transition design |
|
|
|
|
Referring to the following article, I simulate Rectangular Waveguide to Coax Transition Design with HFSS 11.
http://www.w1ghz.org/QEX/Rectangular_Waveguide_to_Coax_Transition_Design.pdf
I expect VSWR from 8 to 12.4 GHz will be under 1.25. But it is difficult. Is it possible?
I attach HFSS file and the result after optimization.
|
|
| Back to top |
|
 |
shlomo22
Joined: 31 Jan 2007
Posts: 45
Helped: 8
|
16 Nov 2008 17:24 rectangular waveguide to coax |
|
|
|
|
| Your Teflon goes all the way to the bottom of the waveguide. In the article, there is Teflon only in the coax cylinder, it does not extend into the waveguide cylinder. Look at the picture on the second-to-last page.
|
|
| Back to top |
|
|
kumagai
Joined: 30 Mar 2007
Posts: 117
|
18 Nov 2008 6:01 design rectangular waveguide |
|
|
|
|
Hi, shlomo22. Thank you for your reply.
Surely Teflon doesn't extend into the waveguide cylinder on Figure 13.
But I try Full height like Figure 7. It seems to be a measurement result.
Full height seems to improve VSWR compared with Bare. So I apply Full height.
I also tried with the size(diameter and length) on Figure 7.
But I couldn't get good results.
|
|
| Back to top |
|
|
Google
AdSense
|
18 Nov 2008 6:01 Ads |
|
|
|
|
|
|
| Back to top |
|
|
shawnliu2005
Joined: 10 Jun 2005
Posts: 1
Helped: 1
|
14 Apr 2009 15:45 Re: Rectangular Waveguide to Coax Transition Design |
|
|
|
|
Hi,
It is not difficult! Just thinking and do more, wish you success.
|
|
| Back to top |
|
|
mauloftin
Joined: 29 Oct 2008
Posts: 262
Helped: 22
Location: CZ
|
15 Apr 2009 7:46 Rectangular Waveguide to Coax Transition Design |
|
|
|
|
Hi,
I tried do this transition from this paper too, I used CST MWS, but the result was not good too, I dont know why... Bare or Full height, the Figure 7 is "
strange", so I have the same experience as you
|
|
| Back to top |
|
|
