estqwerty’s wifi antennas

As I maybe mentioned in my previous post hlssa program gives some very strange results about thickness dimensions of the waveguides. The program says that is passable to build slotted waveguide whit an only 100mm to 25mm tube or waveguide for 2.4ghz band.

Till now I was unable to find anything that confirm this, but now I sow several interesting pictures :

Pictures are from here : www.starhill.org

Look at this - there is NO WAY that this is be 100×50 mm this looks like more like 20 or 25mm !!!

So this will make passable to use other, more easy to be found on the market tubes.

More pictures :

And finally one more thing - 20 to 22dbi omni directional slotted waveguide 25mm thin PDF file whit specification

On http://wireless.com.pt/forum/index.php?PHPSESSID=3a383f0ff0f782f5a00fea2c1e20e5d9&topic=15658.0 You can find interesting antenna projct cardboard slotted waveguide.

Aluminium foil and cardboard is used to build slotted waveguide wifi antenna.

Here some pictures :

Last picture is 11Ghz and 2.4Ghz versions compared.

Waveguide is tested and the resuts are very good - more than 14dbi are reached!

This is a good way to fast build and test antennas, also quick modifications are possable.

The bad thing is that You can not solder aluminium - which for this antenna is not a problem.

The author of this post call this “40cents antenna” and he has several different types of antennas builded and tested.

You can find the links on the http://wireless.com.pt forums.

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 :

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.