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indiaco
Joined: 10 Apr 2004
Posts: 39
Location: Down South...
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 04 May 2004 19:10 2,4 ghz yagi |
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hi folks, i need some theory about yagi design for ism band 2,4 ghz (pdf, links, whatever).
Please donīt send any links to home made yagis I donīt mean to copy someone elses antenna i mean to design my own. 
Thanks a lot.
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vfone
Joined: 10 Oct 2001
Posts: 2441
Helped: 341
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04 May 2004 21:58 Re: 2,4 ghz yagi |
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This will help you
http://innovexpo.itee.uq.edu.au/2000/802533997/Thesis.pdf
best
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chinaing
Joined: 05 Dec 2003
Posts: 35
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05 May 2004 13:36 2,4 ghz yagi |
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| to see 21rf
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indiaco
Joined: 10 Apr 2004
Posts: 39
Location: Down South...
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05 May 2004 18:07 Re: 2,4 ghz yagi |
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chinaing
is there an english version of 21rf ?
if there is one, could you please send it over?
thanks.....
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scoppulal
Joined: 18 Apr 2004
Posts: 131
Helped: 1
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06 May 2004 9:38 Re: 2,4 ghz yagi |
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hi,
you may find something useful in ham radio web pages.
For that frequency you can study DL6WU design (he is a radioamateur),
which also used for other bands.
If you plan to use a Yagi for wireless application this design could be fine: it gives a good gain performance.
scoppu lal
PS. A little source code for this is attached
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scoppulal
Joined: 18 Apr 2004
Posts: 131
Helped: 1
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06 May 2004 9:41 Re: 2,4 ghz yagi |
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for general yagi design search the internet for:
ARRL - Antenna Handbook
ARRL - UHF/Microwave Experimenter's Manual
scoppu
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abdoeng
Joined: 22 Feb 2004
Posts: 691
Helped: 14
Location: EGYPT
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09 May 2004 3:27 Re: 2,4 ghz yagi |
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hi,pls tell me are u design on substrate if yes tell me ur sub details,if u design by tubes wires u can simulate ur antenna using IE3D pacage that i think it very accurae and easy in simulation of 3D wiring antenna
regards
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hf2050
Joined: 27 Nov 2001
Posts: 52
Helped: 2
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09 May 2004 19:09 Re: 2,4 ghz yagi |
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look at:
http://dcnet.arms.cz/anteny/yagi/index.htm
Nice antenna !!
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indiaco
Joined: 10 Apr 2004
Posts: 39
Location: Down South...
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09 May 2004 20:29 Re: 2,4 ghz yagi |
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abdoeng:
thanks for answering, i trying to design a wire antenna, and yes i also think IE3D is the right soft to simulate my problem is lack of good theory.
So if you have any info or suggestions, iīm happy to hear.
thanks, Nico.-
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indiaco
Joined: 10 Apr 2004
Posts: 39
Location: Down South...
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09 May 2004 20:41 Re: 2,4 ghz yagi |
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about hf2050īs link, yes it is pretty cool... but the radiating element seams to be a folded dipole (Z=300, isnīt it ?).
And they feed it with the 50 ohm coaxial line  . Can anybody explain why is this working??
thanks.
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abdoeng
Joined: 22 Feb 2004
Posts: 691
Helped: 14
Location: EGYPT
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09 May 2004 20:48 Re: 2,4 ghz yagi |
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hi here example using ie3d
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abdoeng
Joined: 22 Feb 2004
Posts: 691
Helped: 14
Location: EGYPT
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09 May 2004 20:52 Re: 2,4 ghz yagi |
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| hi using some directors with folded dipole drop it from 300 to 75 ohmsthat i think
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flatulent
Joined: 19 Jul 2002
Posts: 4926
Helped: 328
Location: Middle Earth
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09 May 2004 20:57 Re: 2,4 ghz yagi |
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| indiaco wrote: |
about hf2050īs link, yes it is pretty cool... but the radiating element seams to be a folded dipole (Z=300, isnīt it ?).
And they feed it with the 50 ohm coaxial line . Can anybody explain why is this working??
thanks. |
Because of the mutual coupling between elements, the input impedance of the driven element is much lower than in free space. The folded dipole gets it back up in value for a very low economic and mechanical complexity cost.
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scoppulal
Joined: 18 Apr 2004
Posts: 131
Helped: 1
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10 May 2004 10:09 Re: 2,4 ghz yagi |
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hi,
don't forget to use a balun (balanced - unbalanced) for the feed.
Impedence matching is not the only thing to think to.
Conversion from balanced loads to unbalanced lines
(or vice versa) can be performed with no
impedance transformation.
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indiaco
Joined: 10 Apr 2004
Posts: 39
Location: Down South...
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10 May 2004 15:06 Re: 2,4 ghz yagi |
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abdoeng
thanks for the example, but it doesnīt seem to work  . Sends high warning when trying to simulate....
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abdoeng
Joined: 22 Feb 2004
Posts: 691
Helped: 14
Location: EGYPT
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10 May 2004 21:44 Re: 2,4 ghz yagi |
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| hi,i use IE3D 10 ,what is ur version,pls reply to me that i may help
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FFFFFF
Joined: 22 Jul 2002
Posts: 1305
Helped: 3
Location: FRANCE
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10 May 2004 22:18 Re: 2,4 ghz yagi |
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**
you can also found very good antennas by F9FT
**
http://www.f9ft.com/
**
FFFFFF
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eirp
Joined: 11 Dec 2001
Posts: 638
Helped: 9
Location: Phase center
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10 May 2004 22:57 Re: 2,4 ghz yagi |
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Hi, indiaco!
OK, why just the yagi?
This kind of antennas is very sensitive to size of elements and also the balun is quite problematic..
Without measuring at least reflection coefficient I'm skeptic about success..
If not other restriction, parabola is a very good choice.
Look at attachment, this offset is used from satellite and only the feeding horn is built. The Gain is ~21dBi on the WiFi band
Robust, stable, easy to build
Good Luck!
eirp
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FFFFFF
Joined: 22 Jul 2002
Posts: 1305
Helped: 3
Location: FRANCE
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11 May 2004 0:23 Re: 2,4 ghz yagi |
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**
with yagi antennas no many problems wih the wind !!
with parabol much catch to the wind
Best
FFFFFF
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indiaco
Joined: 10 Apr 2004
Posts: 39
Location: Down South...
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11 May 2004 3:15 Re: 2,4 ghz yagi |
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hi eirp, i thought of a yagi cause i want to get about 12-15 dbi gain.
Low cost, easy to build/set antenna...
but you may by right about the feeding difficulties 
Iīll try with another antenna.... thanks anyway.
Nico
Last edited by indiaco on 11 May 2004 5:09; edited 1 time in total |
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divan
Joined: 01 Mar 2002
Posts: 91
Helped: 2
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11 May 2004 4:16 2,4 ghz yagi |
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What about F9FT - i've experience to make this ones m.b. 15 years ago - nice antennas , it is possible to recalculate up to 600 - 700 MHz.
but for WiFi - maybe some problems if only scale down.
to EIRP
That's great )))))))))))) !!!!!!!!!
Really professinal aproach, minimum time to alignment. Is this your's device?
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11 May 2004 4:16 Ads |
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eirp
Joined: 11 Dec 2001
Posts: 638
Helped: 9
Location: Phase center
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11 May 2004 9:14 Re: 2,4 ghz yagi |
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Hi all!
nico - you're right it's low cost antenna but I can't agree it's easy to build espec. on 2.45G
divan - thanks  but it's not exactly my antenna. I only simulated the whole structure in CST MWS for best performance and my friend have built it.
Cheers
eirp
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scoppulal
Joined: 18 Apr 2004
Posts: 131
Helped: 1
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11 May 2004 9:24 Re: 2,4 ghz yagi |
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hi,
if you want to try a different antenna... with almost same gain,
try the helix.
it is small and will not catch a lot of wind.
ciao
PS. anyway i attached a possible yagi feed: matched with the balun
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scoppulal
Joined: 18 Apr 2004
Posts: 131
Helped: 1
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12 May 2004 8:23 Re: 2,4 ghz yagi |
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HI INDIACO!
this is what i promise you. attached.
Hope it is what you wanted...
let me know if it is ok.
Ciao
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divan
Joined: 01 Mar 2002
Posts: 91
Helped: 2
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12 May 2004 10:21 2,4 ghz yagi |
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Sweet songs about this "helix-yagi" , but base at my experience i don't belive in 18dBi single yagi Easy-To-Build-Aligment-No-Need.
If u need a gain and have no antenna range the dish is only way, another case not more than 12-(14?) dBi. nice VSWR wich this *** said about , don't mean good gain.
Thanx
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