estqwerty’s wifi antennas

This is interesting russian antenna. Small sector antenna, gain is only 10 to 12 dbi.

From this site I can find that the price of this is nearly 200 euros or 260$ !!!

http://shop.itconnection.ru/product_info.php?cPath=26_57&products_id=131&osCsid=f5a43f3c297c0be57043aa716207b935

Quick specifications :

In the russian forums for a lot of antennas this last “Input is DC-circuited” is very critical ! There is some sort of fanaticism about this may be the weather there, I’m not sure why.

Here is link to some pictures of the interior from here :

http://vbm.lan23.ru/wifi/grad2487/grad2487.html

What we have under the fiberglass hood - strong plate which hold connector, coax line to the one pcb plate whit four printed dipoles.

The design of the dipoles is very interesting to me - I sow this dipole design several times :

You can find dimensions of this antenna whit lot of pictures www.lan23.ru forum.

I’m not completely sure why this antenna is so interesting to me.

You can search in google for “printed Dipole Antenna with integrated Balun” and will find something very similar to the upper pictures. So design is well known and used from manufacturers.

Here some links :
http://www.cst.com/Content/Applications/Article/ArticlePrintVersion.aspx?articleId=55

http://www.mwjournal.com/journal/article.asp?HH_ID=AR_3769

On these examples balun is madded whit hole trough the plate or “via hole” , but on this antenna we do not have a hole.

BUT without this hole I cannot see this “Input is DC-circuited” thing! Where they close the loop?

Here I find something very similar only multiplied by four for creating omnidirectional antenna :

http://www.mwjournal.com/News/article.asp?HH_ID=AR_4774

And finally one more picture on which we have similar dipole and feeding :

For final this is very complicated antenna extreme hard to be reproduced without proper materials, equipment and software tools.

This shows very professional design whit a lot of variables and places which need to be tunned. For me this antenna is impossible to be built at home.

Hyperlink
Sect14
Sectorial
Gain: 14 dBi
found on :
http://www.zero13wireless.net/foro/s…ead.php?t=3021
http://under-linux.org/forums/wirele…u-aplinux.html

First I wish to say that I build and tested this antenna, and I was SURPRISED - how this small device is able to work so good! This small antenna outperform my other two homebuilt 14dbi wifi panels.

I used two one sided pcb to create this, but on the zero forum there are pictures where only thin metal sheets are used, and it works again.

The diameter of the circle is equal to the half wave light of the 2.4ghz wifi band or 62mm , so this antenna may be recalculated for other /5ghz/ frequencies.

Now antenna INFO :

Name of Antenna, model : SMCANT-DIFP11

Data sheet can be found on this link : http://www.smc.com/files/AP%5CDS_ANT.pdf

Frequency : 2.400 - 2.500 GHz
Gain : 11 dBi
VSWR : < 1.22
POLARIZATION : Circular
BEAM WIDTH • Horizontal: 70° • Vertical: 70°
IMPEDANCE • 50 Ohms
DIMENSIONS • 25 x 102 x 102 mm

So here is the interesting part - this one is found disassembled on www.zero13wireless.net

Link to the forum www.zero13wireless.net

Very small! Great results!

Dimensions of the reflector are 105×105 mm

8 mm gap between two metal plates of the “circle” and the reflector.

Here are my test whit this antenna - the original test was for other but I need something to compare :

http://www.digdice.com/2007/05/17/d-link-ant24-1200-sector-panel-antenna/

Here is the way to stack two of these homebuilt antennas together : http://www.digdice.com/2007/08/10/httpwwwdigdicecomwp-adminpost-newphp/