Posts Tagged ‘Omnidirectional’

Horizontal Polarized Omni

Monday, August 20th, 2007


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” :

wendelan.jpgbake.jpg

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.

D-Link Ant24-1200 Sector Panel Antenna

Thursday, May 17th, 2007


D-Link Ant24-1200 Sector Panel Antenna

Gain : 12 dbi

web site : www.zero13wireless.net
dlink_ant24-1200_2.jpgdlink_ant24-1200_3.jpgD-Link Ant24-1200 Sector Panel Antenna

So I make one but still cant get it working.
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In the test witch netstumbler – i get too low results – may be something is wrong, maybe material of pcb board is not the same 🙁

My TEST for dwl 12dbi thing something is wrong whit my ones :

this is room test – distance ~2m
linksys wap11 whit original antenna – AP
zydas zd1211 usb whit rpsma connector soldered and 5 cm coax soldered to antennas.
various antennas tested to be able to compare result.

Second test – tv tower ~1.5 to 1.8km

Same antennas – near same ressults
rubber duckie 2dbi , smc 11 clone , trend omni – original , interline 14 dbi clone and dwl 12dbi

I tried different position of the reflector I used another piece of pcb – no results .
Maybe the material of the pcb board does matter???

Another thing is the low result of interline 14 panel – i was tested it before and get good results.

I’ll make some more tests but i’m loosing faith in this one 🙂

Here is the link to the forum from where i take blueprints for this one http://wireless.com.pt/forum/viewtopic.php?t=14978

5.2 dbi Cisco omni antenna

Wednesday, May 9th, 2007

5.2 dbi Cisco omni antenna : AIR-ANT1728

Original post is here : http://www2.nag.ru/forum/

Plastic tube is 285 mm.