Pictures are from this site starhill.org
Interesting design as You can see.
There are four stacked biquads or bicircles over a corner reflector.
Here is a PDF file whit a dimensions of this wifi antenna : 12dB_sektor_antena.pdf
Interesting moments are grounding and feeding of the circle elements – you can see this here :
I never sow biquads to be grounded or feeded like this.
Interesting post in zero wireless forum about stacking four atmos antennas.
The result looks very bizarre really :
here is the link :
http://www.zero13wireless.net/foro/showpost.php?p=21206&postcount=110
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 :
| Frequency band | 2400-2483 MHz | |
| Gain | 13 dBi | |
| Maximum input power | 100 W | |
| Power distribution diagram |
|
|
| Impedance | 50 Ohm | |
| Standing wave coefficient | 1,5 | |
| Mast mount diameter | 35-60 mm | |
| Weight | 1.8 kg | |
| Size, L x W x H | 250x160x360 mm | |
| Maximum wind speed | 160 km/h | |
| Polarization | Vertical | |
| Operating temperatures | -40° … +50° C | |
| Connector | N-Type female | |
| Additional information | Input is DC-circuited |
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.
