Posts Tagged ‘spiral antenna’

Stub Loaded Helix WIFI Antenna

Monday, October 15th, 2007

Goggling early in the morning some time give me some very interesting results πŸ™‚

This time is this thing – helix antenna whit reduced dimensions.

http://www.vtnews.vt.edu/news_print/index.php?relyear=2005&itemno=899

This thing have gain: 12dBi and dimensions only 165mm light and diameter of a dish 165mm

link : http://www.hitel.it/default3NSD.asp?tree=108&usr=-1&codlingua=1&grc=4&grl=16

Here You can find some patent info: http://www.patentmonkey.com/PM/patentid/5986621.aspx

On the net there is a lot of info I thing : http://scholar.lib.vt.edu/theses/available/etd-11242003-123529/unrestricted/Barts_etd_CH4.pdf

helix.jpg

and also good article about traditional spirals http://scholar.lib.vt.edu/theses/available/etd-11242003-123529/unrestricted/Barts_etd_CH3.pdf

Here You have experimental build and testing of several of these antennas πŸ™‚

http://scholar.lib.vt.edu/theses/available/etd-11242003-123529/unrestricted/Barts_etd_CH7.pdf

Google is a great thing πŸ™‚

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Posted in Antenna, Directional | Comments Off on Stub Loaded Helix WIFI Antenna

Horizontal Polarized Omni

Monday, August 20th, 2007


Horizontal Polarized Omnis are mystery for me πŸ™‚ . 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.

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Posted in Antenna, Omnidirectional | 2 Comments »