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scoutspeeder
Joined: 18 Jan 2007
Posts: 3
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 18 Jan 2007 18:13 hfss dipole |
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I am very new to the use of ansoft hfss. I have v10.
I am trying to model a simple dipole antenna, but so far I seem to be having more difficulty than I should.
I modeled a dipole with a short feed and tried to setup a gap source with a lumped port between the feeds, but I keep getting an error about port refinement. Any suggestions?
I've attached my file.
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how_many
Joined: 26 Jul 2006
Posts: 9
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19 Jan 2007 23:01 hfss dipole antenna |
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it looks like the feed might be the least of your problems. the radius of the dipole is too small (0.005mm?!) and that is not a good thing for simulation. do not try to actually model an infinitesimally thin dipole - use realistic numbers, balanis has info on how to correct the res. freq. for finite thickness. it will take forever for HFSS to simulate this case, if it can actually find the memory (and normally it shouldn't take more than 5 mins on an avg. PC to do a dipole with freq. sweep).
the radiation box doesn't have defined boundaries. by default HFSS assumes PEC on all boundaries, for a radiation problem (like the dipole) - you don't want that.
the lumped port is not defined correct. the patches that you draw for lumped port are not 'pads' - you draw a patch between two terminals (the two arms of the dipole) and then draw the int. line on top of it.
hope this helps.
SK
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cr_skyworks
Joined: 04 Aug 2006
Posts: 33
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20 Jan 2007 22:44 hfss dipole antenna design |
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| You need also set up a boundary in order to simulate the radiation elements. Hope this helps.
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scoutspeeder
Joined: 18 Jan 2007
Posts: 3
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01 Feb 2007 16:43 hfss dipole antenna impedance |
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Thanks for your help, I've come a little farther, but still can't seem to get the results I want.
I have followed your advice and increased the radius (as well as the length), remodeled the port, and added the radiation boundary. I no longer get any errors, but I can't seem to get any results to display or solution data to show up when I analyze the setup.
new file attached
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Lens
Joined: 01 Feb 2007
Posts: 4
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02 Feb 2007 0:08 dipole simulation hfss |
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This is good dipole disign, as seems 
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cuongtran
Joined: 06 Feb 2007
Posts: 182
Helped: 4
Location: WhiteHouse
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06 Feb 2007 18:44 dipole.hfss |
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| Lens wrote: |
| This is good dipole disign, as seems |
parfaitement !!!
here is dia-ray 
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Kilokahn
Joined: 19 Jan 2005
Posts: 4
Location: Kuala Lumpur, Malaysia
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20 Feb 2007 23:49 dipole antenna in hfss |
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I am using HFSS V9.1 and I cannot open the files uploaded here. Each time I want to open them, it says "File is locked". Is there a way to go around this problem?
Question: how do i represent a UHF RFID chip as a load in such simulation? I want to attach a dipole antenna to the chip. What type of port should I use?
Many thanks!
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