estqwerty’s wifi antennas

Found on http://www.zero13wireless.net/foro/showthread.php?t=3964

I cant find original site of this antenna there is links on Zero13wireless forum.

I cut a lot of coax without any success before time in attempt to make a coax omni antenna.

This thing here is looking different. But maybe will work.

This is the idea :

30mm in the beginig 1/4 wave - may be patching section.

40 mm of outer of coax is used to dephaseing sections.

60 mm sections as 1/2 wave radiators.

And that is.

Here is the scans of inside - very thin pcb board is used.

Some time ago I needed some 5ghz antennas - this is the first thing that I bought.

Dual-band 11a/g 7/5dBi Indoor Omni Antenna from trendnet.

The papers says :

The stupid thing is that on the site specification and in pdf data sheets was said that this antenna have VERTICAL polarization, but now I can see that omnidirectional pattern came whit horizontal polarization!

This may be the reason why I am not happy whit this wifi antenna and it is still laying on my desk.
I will test it again when I have some time.

The other small wifi antenna that I have from trendnet is working great - I have small 5ghz link whit it - these days maybe will scan ti too.

All my links for antennas whit multi polarization

List of all products of wifi-plus : www.wifi-plus.com/antennas
Lets begin whit this page here : http://www.dslreports.com/forum/remark,13636968

You can find comparison of 5dbi multi polarized to 7dbi rubber duck : www.zero13wireless.net
Tested model is : MP 5 OMNI 5dBi CHP

Dimensions of the 17dbi model :

http://www.zero13wireless.net/foro/showpost.php?p=5579&postcount=2

Here a tread whit all the dimensions and tests, also home build versions of 17dbi antenna :
http://www.zero13wireless.net/foro/showthread.php?t=881

Here You can find a test between 12dbi MP and 14 Yagi in the forest :
http://www.zero13wireless.net/foro/showthread.php?t=1750

MP 12dbi The same as 17dbi version only shorter :

http://www.zero13wireless.net/foro/attachment.php?attachmentid=1115&d=1185362179

Pictures of 12dbi version

Pictures of Bullet Omni 3dbi (2.4/5.X GHz) and Omni 5dbi (2.4/5.X GHz)
http://www.zero13wireless.net

In the net there was also some pdf pathent files one is here : click

Horizontal Polarized Omnis are mystery for me . Anyone was seen open vertical polarized omni for wifi. Whit horizontal ones there is another story. Except slotted waveguides /these works great/ , but they are really big things.

Here is one idea for horizontal omni or “double helix antenna” :

http://hft.uni-duisburg-essen.de/amateurfunk/amateurfunk_en.shtml

Mast is used for reflector for for this one. Ant in the internet there is a lot of designs for spiral antenna. Difference here is that is used dual spirals. Coaxial line is hidden inside of the mast, and its look like that feeding point is on the bottom of the antenna.

One more link - there was calculator for this antenna on that treat : http://wireless.com.pt/forum/index.php?topic=15786.0 but now I cant find it.

Thanks to the rt_rex You can find calculator on this site : Omni Helix XLS

I hope that soon we can see some results and tests of this antenna.