estqwerty’s wifi antennas

Link to the original site whit pictures : http://wavetenna.blogspot.com

This omni antenna specification are available from Ovisilink or like AirLive.com WAE-085GP

Band : 2.4Ghz 802.11b 802.11g WIFI bands

Gain of 8.5 Dbi

Connector type - Female N-Type

Polarization - Vertical

Dimensions - 570 x 29 mm

And pictures are from the rt_rex site http://www.wavetenna.blogspot.com/

So this is a quite interesting antenna. This is the first REAL antenna that is similar to this strange picture that circulate on the internet :

The dimension did not match but the idea is very similar. quite interesting match really.

There is nothig on the net about this Radproject 2000 or anything about this upper design.

Pictures are from this site starhill.org

Interesting design as You can see.

There are four stacked biquads or bicircles over a corner reflector.

Here is a PDF file whit a dimensions of this wifi antenna : 12dB_sektor_antena.pdf

Interesting moments are grounding and feeding of the circle elements - you can see this here :

I never sow biquads to be grounded or feeded like this.

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 wireless.com.pt forum I found very interesting article - there are some em simulations of this famous russian antenna. Interesting is that the auhtor made several test with different number of radiating elements.

This is FA20 original design :

Next is with 12 patches :

And finally 16 elements :

Here are results for swr in different simulations :

VSWR 8 Dipoles –> minimum at 2.44ghz 1.46; from 2.4 to 2.5ghz <2.5
VSWR 12 Dipoles –> minimum at 2.45ghz 1.89; from 2.4 to 2.5ghz <2.8
VSWR 16 Dipoles –> minimum at 2.44ghz 1.96; from 2.4 to 2.5ghz <3.4

SWR results are not very good

This may be due to a different dimensions used by fable to test this design.

He also used very interesting metod to build and test this design. He used aluminium foil and cardboard.