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konstantinos100
Joined: 26 Sep 2007
Posts: 3
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 26 Sep 2007 14:12 Opinion need it |
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Dear Forum,
The compnay i work for, it's now expand and need to design microwave filters with cavitys. They asked me to make a market search. I have not found any program which calculate the cavities. Also we need a packet to simulate if that is possible before we order it. We tried the concerto which is very easy to work with and has easy scripting but i am not sure that is the proper for the work we like to do. So could you please give me your opinion which set of programs we may use for that?
Thanks in advance for your time.
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ali110
Joined: 02 May 2005
Posts: 122
Helped: 5
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| 26 Sep 2007 23:18 Re: Opinion need it |
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Hi
it's better that you use two software:
1. IE3d because it has cavity back simulation
2. microwave office because it has cavity in default
or you can HFSS or CST that we can model any shape cavity
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konstantinos100
Joined: 26 Sep 2007
Posts: 3
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| 27 Sep 2007 6:59 Re: Opinion need it |
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| And for initial design any suggestions?
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ali110
Joined: 02 May 2005
Posts: 122
Helped: 5
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| 27 Sep 2007 7:45 Re: Opinion need it |
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hi
I think it's better that you start with CST
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Joe_User
Joined: 21 Feb 2005
Posts: 19
Helped: 1
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| 28 Sep 2007 14:14 Re: Opinion need it |
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| What type of filters are you looking at? Could you give a little more information about the size and shape of the cavities you would like to simulate?
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konstantinos100
Joined: 26 Sep 2007
Posts: 3
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| 01 Oct 2007 8:42 Re: Opinion need it |
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| Mostly combline and interdigital filters
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mallelauma
Joined: 25 Mar 2008
Posts: 92
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| 13 May 2008 9:15 Re: Opinion need it |
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hi
itis better to use HFSS for your designs.
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maxwellian
Joined: 22 Feb 2005
Posts: 115
Helped: 18
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| 13 May 2008 14:55 Re: Opinion need it |
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You didn't say what kind of topology is used for your filters.
Here are my opinions, for what they are worth:
If you are looking at 3D cavity resonator filters, or waveguide cavity filters with tap resonators, inductive posts, irises, etc., with very high Q (very narrowband), then I would recommend you consider a finite-element frequency domain 3D EM software, like HFSS, Concerto, the CST FEM/freq domain tool, or other finite-element approach.
If you are looking at a wideband 3D (non planar) filter design, then I would recommend a time domain 3D software, like CST time domain solver, REMCOM, IMST or other FDTD or FIT approach software. The time domain codes seem to be more efficient when you have a wideband simulation.
If you are designing planar filters inside of a cavity, then I would suggest that you consider a shielded planar Method of Moments simulator, like Sonnet or AWR EMSight. These tools automatically assume a cavity around your filter. Sonnet even lets you put internal ports very close together inside your filter so you can tune extra coupled line sections or open/short stubs in a fast circuit theory simulator (like AWR or ADS) outside of the slower EM simulation loop.
Unshielded Method of Moments tools (like Agilent Momentum or IE3D) are better for antennas because they assume there are no shielding walls. They can do filter simulations without cavities, but their cavity simulation effects are more of an approximation, I think. For cavities with close spacing to the filter, the simulations must be very accurate because they have a fairly strong effect on the passband edges of the filter.
--Max
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Phytech
Joined: 30 Apr 2008
Posts: 23
Helped: 3
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| 14 May 2008 18:52 Opinion need it |
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| HFSS works fine for cavity filters.
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Azulykit
Joined: 18 Feb 2007
Posts: 680
Helped: 82
Location: All over the Map.
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| 14 May 2008 21:16 Re: Opinion need it |
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I liked Max's assessment of several software choices.
The way I see this is that there are several fundamental choices: Are you after analysis of synthesis software? Most of the software tools are really good at analysis and poor at synthesis.
another rule is : Good, fast, cheap. Pick only two.
Code that is not particular user friendly is often really useful while easy to use software has limited scope.
All that being said I would seriously consider HFSS (analysis orientation, good, not overly fast, not cheap, somewhat unfriendly but really flexible).
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