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fighter5555
Joined: 08 Feb 2002
Posts: 20
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 02 Feb 2003 16:08 Power Combiner |
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| Any ideal on how to design a 16 way Power combiner operating at 2.4 GHz
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flatulent
Joined: 19 Jul 2002
Posts: 4856
Helped: 292
Location: Middle Earth
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| 02 Feb 2003 17:29 tree structure |
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| Do a tree structure of 2-1 splits following 2-1 splits. Four levels will get you 16-1. Wilkinson types are small and wide enough bandwidth at the ISM band you are working with.
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fighter5555
Joined: 08 Feb 2002
Posts: 20
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| 02 Feb 2003 17:37 |
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| Any recommenation on the types of resistors to be use for the wilkinson power combiner since it is using on the ISM band?
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flatulent
Joined: 19 Jul 2002
Posts: 4856
Helped: 292
Location: Middle Earth
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| 02 Feb 2003 18:02 several criteria |
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| Since you are probably ending up with 1 W or less at the other end, the power rating of the resistors should be 1/16 W or so. ordinary surface mount types will do. Double check the data sheets to make sure of the frequency rating. If this network is to be operated at higher power levels, special power resistors, such as made by Anarin http://www.anaren.com/docs/app_notes/AAN-1004%20-%20SMD%20RES.pdf should be used.
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fighter5555
Joined: 08 Feb 2002
Posts: 20
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| 02 Feb 2003 18:11 |
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| Thanks for the informations
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g579
Joined: 01 Jan 1970
Posts: 457
Helped: 14
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| 02 Feb 2003 21:20 |
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| For power levels of up to a few Watts you can stack up normal 1206 resistors (generally 0,25W each), if cost is an important factor.
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ajar2dtn
Joined: 27 Jun 2002
Posts: 34
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| 03 Feb 2003 11:43 |
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If you are looking for a compact low power solution with SMD device have a look at;
http://www.alphaind.com/
some of these will operate at 2.4GHz depending on your requirements.
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Lupin
Joined: 22 Jan 2003
Posts: 326
Helped: 2
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| 13 Feb 2003 12:21 |
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Newbie,
you have to give requirements about output amplitude and phase, Bandwidth... mechanic performances....so I'll try to help you.
Does anyone have material about squared coaxial lines?
I need design equations about losses reltive to squared or rectangular coaxial lines.. Hope someone can help me.
Thanks in advance
Lupin
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dowjones
Joined: 21 Nov 2001
Posts: 136
Helped: 5
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| 19 Feb 2003 10:42 |
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hi lupin,
I've seen some material in the antenna handbook (Lo) chapter 28 end of table 4. include impedance, I have not seen anything on losses.
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Lupin
Joined: 22 Jan 2003
Posts: 326
Helped: 2
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| 20 Feb 2003 0:42 |
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Thanks Dowjones,
anyway, for squared coaxial lines I found equations about characteristic impedance; at the moment for rectangular lines into squared lines I've no formulas.... So, I've thought to use some 3D e.m. software to evaluate the characteristic impedance everytime I change the horizontal (or vertical) dimension of the inner conductor...
Do you think it's a possible method? In this way the results depend on the mesh I'm using and on the accuracy of the code.. So they don't derive from a rigorous analysis like in squared coaxial line.
What do you think?
Regards
Lupin
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jamez
Joined: 15 Jan 2002
Posts: 57
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| 20 Feb 2003 12:47 |
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Hi,
You can make a radial form power combiner very compact.
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dowjones
Joined: 21 Nov 2001
Posts: 136
Helped: 5
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| 20 Feb 2003 14:29 |
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hello lupin,
well, i've done a similar process with suspended substrate stripline and it works fine. the main problem is that you cannot account the effect of discontinuities
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Lupin
Joined: 22 Jan 2003
Posts: 326
Helped: 2
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| 21 Feb 2003 19:24 |
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Hello dowjones,
I think it's not the same thing: for a stripline structure for most of e.m.
codes you have formulas to estimate guided lambda, characteristic impedance (given the line width), line width (given the line impedance).
As an example, Ensemble offers this option... Of course you can't consider discontinuity effects but it's a good starting point.
In my case, the rectangular coaxial line is a too particular configuration; in fact I can't find in litterature formulas for the associated line impedance... So I'm obliged to build a configuration by a 3D code, mesh it very carefully, run the simulation and to hope the result to be accurated...
If I consider more lines with different rectangular sections, I can have strong discrepancies between simulated and measured components...
Hope you find some article or formula about configurations of rectangular inner conductors into squared outer conductors.
Regards
Lupin
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dowjones
Joined: 21 Nov 2001
Posts: 136
Helped: 5
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| 25 Feb 2003 13:40 |
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hi lupin,
I've scanned 4 pages which maybe they are useful for you. I'm afraid the scanned pages give a quite huge archive (which will be uniquely useful for you, and even this it is not sure). do i upload the file (8Mb) or send to you as pm?
regards
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Lupin
Joined: 22 Jan 2003
Posts: 326
Helped: 2
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| 25 Feb 2003 15:20 |
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As you like Dowjones.. I don't know how many Elektroda people work with rectangular section lines coaxial to squared section lines....
Probably just a few... If you want you can send the material to my e-mail or as a private message...For me it doesn't matter.
What type of formulas did you find? Line Impedance, Losses?
Thanks a lot... you know my interests, you can just ask if you have a question.
Regards
Lupin
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dowjones
Joined: 21 Nov 2001
Posts: 136
Helped: 5
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| 25 Feb 2003 17:35 coaxial line square section |
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they are only 4 scanned pages. the first page is from antenna handbook (by Lo & Lee) the other pages are from Microwave Engineers Handbook (by Hansen and Wheeler 1971 Artech House). I keep the size so that the figures can be read.
regards
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g86
Joined: 21 Jan 2003
Posts: 208
Helped: 4
Location: On top of antenna :))
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| 28 Mar 2003 15:28 |
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I agree with jamez. For a 16 way power divider radial configurations are compct with respect to a corporate structure.
  
| jamez wrote: |
Hi,
You can make a radial form power combiner very compact. |
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Mazi3
Joined: 29 May 2002
Posts: 101
Helped: 2
Location: Europe
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| 28 Mar 2003 22:51 |
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| jamez wrote: |
Hi,
You can make a radial form power combiner very compact. |
How does it look like? What impedances, lengths?
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g86
Joined: 21 Jan 2003
Posts: 208
Helped: 4
Location: On top of antenna :))
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