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How to calculate width and space for parallel-coupled filter

 
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kpcheah



Joined: 07 May 2008
Posts: 5
Post26 Aug 2008 13:52   How to calculate width and space for parallel-coupled filter
I am trying to design microstrip bandpass filter. I have calculate the even-mode and odd-mode characteristic impedance, but i dont know how to calculate the width and the space for the filter. Can anyone help me. Below is the data i obtain:

j (Z0e) (Z0o)
0 82.9367 37.6092
1 61.1600 42.3705
2 58.1839 43.8661

The thickness is 0.635 mm
relative dielectric constant is 10.2

Is there any e-book or any web-page have the information about this?
THX
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james cook



Joined: 04 Sep 2005
Posts: 200
Helped: 7
Post26 Aug 2008 14:42   How to calculate width and space for parallel-coupled filter
you can calculate the width and space with HFSS. use the driven modal. 2 mode for a wave port.
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biff44



Joined: 24 Dec 2004
Posts: 1301
Helped: 169
Location: New England, USA
Post26 Aug 2008 15:23   Re: How to calculate width and space for parallel-coupled fi
I had the same problem recently. I had some filters to design, had an old excel file that gave the correct Zoe and Zoo's, but when I got them I did not know what to do with them! None of my software takes even/odd mode impedances anymore!

There used to be a program called TLine that did this calculaton (impedance to physical dimensions). You might look around for some shareware. This site looks promising, for instance:
http://atlc.sourceforge.net/tutorial.html
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RealAEL



Joined: 16 May 2008
Posts: 47
Helped: 11
Location: Hotel California
Post27 Aug 2008 5:08   Re: How to calculate width and space for parallel-coupled fi
If you have access to ADS then LineCalc can do all you need. You will need perhaps to be a bit more specific about the material properties than just H and Er. These number therefore only approximate.

j___(Z0e)____(Z0o)____W_______S____
0 - 82.9367 - 37.6092 - 0.35 mm - 0.16 mm
1 - 61.1600 - 42.3705 - 0.54 mm - 0.52 mm
2 - 58.1839 - 43.8661 - 0.56 mm - 0.69 mm

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Azulykit



Joined: 18 Feb 2007
Posts: 795
Helped: 100
Location: All over the Map.
Post27 Aug 2008 17:16   Re: How to calculate width and space for parallel-coupled fi
You might find LINC2 software useful. I believe it is on the order of $500 or so.
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