estqwerty’s wifi antennas

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 :

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.

This one is very interesting design. I was used something VERY similar before time and all that I remember is, that it defiantly WORK fine, but it is pain to tune this.

All pictures are from this page : http://www.guw.cl/sitio/index.php?option=com_content&task=view&id=78&Itemid=36

This antenna is combination from usual J Pole antenna and Franklin array antenna /AMOS antenna only onmidirectional /.

Gain of this omni antenna is around 6dbi, but you may add more by adding more sections. Double the sections to add 3dbis.

Dimensions :

And feeding point and tune stub :

Some suggestions :

First CHECK dimensions of Your antenna.

Second : Matching to the feed-line is archived by sliding the connection of the feedline back and forth along the stub until an SWR as close as possible to 1:1 is obtained.

Third : Try to add quarter-wave ground plane.

Four : You can bend the half wave section to a half circle to be able to use small diameter of plastic tube :

http://en.wikipedia.org/wiki/Slim_Jim_%28antenna%29

Some more pictures :

Finally I was able to find info about original 9dbi omni rubber ducky antenna!

All pictures are from this site : http://www.digga.eu/wlan/9dbi/

Here it is - no surprises here

Looks like there is no way to tune this antenna - here is the feeding point.

For more info about building this one go on site http://www.digga.eu/wlan/9dbi/

And for me was just left to see only ripped 7dbi omni antenna

Thanks to the author of the site for the pics.

5.2 dbi Cisco omni antenna : AIR-ANT1728

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

Plastic tube is 285 mm.