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 :
| Frequency Range | 802.11a: 4.9 ~ 5.875GHz 802.11b/g: 2.4 ~ 2.5GHz |
| Gain | 802.11a:7dBi 802.11b/g:5dBi |
| VSWR | 2.0:1 |
| Polarization | Linear, vertical |
| HPBW/ Horizontal | 360° |
| HPBW/ Vertical | 802.11a:25° 802.11b/g: 35° |
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 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
