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Mazi3
Joined: 29 May 2002
Posts: 101
Helped: 2
Location: Europe
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 13 Mar 2003 21:55 microwave filters - waveguide |
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Hi!
I would like to know how to design and then build filters in waveguide ; only digital and interdigital version, with open end (if there is lambda/4 to the end...).
I have some experience in building such filters, but none in the design.
Is there eny useful software, or exists theory with "cookbook"?
Regards!
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g86
Joined: 21 Jan 2003
Posts: 208
Helped: 4
Location: On top of antenna :))
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| 14 Mar 2003 20:41 Re: microwave filters - waveguide |
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For software: you may synthesys with eseptum or cocafil and simulate with microwave wizard
  
| Mazi3 wrote: |
Hi!
I would like to know how to design and then build filters in waveguide ; only digital and interdigital version, with open end (if there is lambda/4 to the end...).
I have some experience in building such filters, but none in the design.
Is there eny useful software, or exists theory with "cookbook"?
Regards! |
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Mazi3
Joined: 29 May 2002
Posts: 101
Helped: 2
Location: Europe
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| 15 Mar 2003 20:37 |
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tnx, I'll se If demo will help me  but they cost a whole bunch
I would like to design filter for 1.42G, 2.2GHz, 8-9 GHz
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g579
Joined: 01 Jan 1970
Posts: 457
Helped: 14
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| 16 Mar 2003 17:39 |
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| I think you use the word "waveguide" incorrectly. In general it means you use a (square or round cross section) tube as a transmission line.
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Mazi3
Joined: 29 May 2002
Posts: 101
Helped: 2
Location: Europe
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| 17 Mar 2003 20:41 |
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tnx, yes, i mean waveguide as a line, whre the fingers (resonators) are installed.
I've downloaded the demo software, but it's unusable. Demo has limits in frequency (>20GHz) which is not suitable for me. If there would be no "recipes" i'll try to do it in cut&try method
Maybe I'll get some recipes about doing that
Is there anybody who would help cutting the pipes? or have some ideas how to do it first time
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Borber
Joined: 01 Jan 1970
Posts: 1485
Helped: 111
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| 31 Mar 2003 7:40 filter |
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I have few programs for calculation interdigital and waveguide filters.
This can help I think. On basis of this software I have build filters successfuly.
LP Borber
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Mazi3
Joined: 29 May 2002
Posts: 101
Helped: 2
Location: Europe
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| 17 May 2003 9:44 |
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Hi!
Are those programs support filters with open ends? they are much simpler to build than those which are closed.
I would like to build filter from square aluminium pipes (standard sizes). does they support to enter physical dimensions and then it calculate the response?
Regards!
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Borber
Joined: 01 Jan 1970
Posts: 1485
Helped: 111
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| 17 May 2003 13:13 |
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Included are programs for interdigital filter + GW Basic, waveguide filter and Excell file. Digifilt2.bas calculates open end filter build with square tube. It is written in GW Basic.
LP Borber
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flatulent
Joined: 19 Jul 2002
Posts: 4856
Helped: 292
Location: Middle Earth
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| 18 May 2003 1:18 scale the dimensions |
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| One trick to avoid the frequency limit problem is to scale all dimensions inversely by the same factor as the frequency. This will get you close enough to use an analysis program to check and fine tune the scaled design.
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