Posts Tagged ‘2.4ghz’

12Dbi 180degree Sector WiFi Antenna

Saturday, November 10th, 2007

Pictures are from this site starhill.org

12dbi 180deg sector 4 quad wifi antenna12dbi 180deg sector 4 quad wifi antenna12dbi 180deg sector 4 quad wifi antenna12dbi 180deg sector 4 quad wifi antenna12dbi 180deg sector 4 quad wifi antenna12dbi 180deg sector 4 quad wifi antenna12dbi 180deg sector 4 quad wifi antenna12dbi 180deg sector 4 quad wifi antenna12dbi 180deg sector 4 quad wifi antenna12dbi 180deg sector 4 quad wifi antenna

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 :

12dbi 180deg sector 4 quad wifi antenna

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

Thin Slotted Waveguide for 2.4Ghz

Saturday, November 3rd, 2007

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 with 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 :

thin slotted waveguideThin Slotted Waveguide for 2.4Ghz

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 :

slotted waveguideslotted waveguideslotted waveguideslotted waveguide

And finally one more thing – 20 to 22dbi omni directional slotted waveguide 25mm thin PDF file with specification

FA20 EM Simulations

Wednesday, October 24th, 2007

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.