2,4 ghz yagi
Please don′t send any links to home made yagis I don′t mean to copy someone elses antenna i mean to design my own.
Thanks a lot.
This will help you
http://innovexpo.itee.uq.edu.au/2000...997/Thesis.pdf
best
to see 21rf
chinaing
is there an english version of 21rf ?
if there is one, could you please send it over?
thanks.....
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
for general yagi design search the internet for:
ARRL - Antenna Handbook
ARRL - UHF/Microwave Experimenter's Manual
scoppu
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
look at:
http://dcnet.arms.cz/anteny/yagi/index.htm
Nice antenna !
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, i′m happy to hear.
thanks, Nico.-
about hf2050′s link, yes it is pretty cool... but the radiating element seams to be a folded dipole (Z=300, isn′t it ?).
And they feed it with the 50 ohm coaxial line . Can anybody explain why is this working?
thanks.
hi here example using ie3d
hi using some directors with folded dipole drop it from 300 to 75 ohmsthat i think
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.
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.
abdoeng
thanks for the example, but it doesn′t seem to work . Sends high warning when trying to simulate....
hi,i use IE3D 10 ,what is ur version,pls reply to me that i may help
**
you can also found very good antennas by F9FT
**
http://www.f9ft.com/
**
FFFFFF
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
**
with yagi antennas no many problems wih the wind !
with parabol much catch to the wind
Best
FFFFFF
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 :(
I′ll try with another antenna.... thanks anyway.
Nico