Tere are some interesting result of testing panel antenna for wifi band on Russian site : http://www.lan23.ru/forum/showthread.php?t=1009
Antenna is tested when the pcb print is looking toward to a reflector and back.
You get lower SWR when the pint is looking to a reflector - pictures shows all :
On the www.lan23.ru are updated page for building wifi swr meter. mcWit was able to find replacement of the BAT62-03W Schottky diode used by pe2er.nl in his design. New diode is hsms-2822
There are several changes in the elements in due diode change. I can’t understand everything written on the site. But everything is there and all is build and tested.
Now just need to wait for more documentation.
Here is a picture of the finished device :
I don’t like Yagi antennas /sorry/, and I never try to make one , but this look interesting - it is only one side pcb design that differ from the most dual sided similar.
On the side is said that this antenna is a clone to a commercial one, but not a name or model is mentioned.
The dual sided board is needed to make the feeding point of the yagi antenna - here we have something very interesting and different to be able to make all needed parts on one sided PCB board. In fact this is dipole.
Link to the page : http://www.aribg.it/Tech/WiFi/Yagy24ydm/yagi24ghz.htm
Here is schematic :
Here some pictures whit dimensions :
On the second picture You can see haw to assemble the dipole - this is the interesting part. This antenna is feeded by dipole not whit loop like most Yagi antennas. Here they make a balun whit the stripped coax and the pcb board.
There is also one aluminum disk used to hold the board that is used as reflector :
On the site is said that this antenna have 11.5dB gain. And for last there is a SWR test for this antenna pretty good results I thing :
The peek is little out of wifi band but we still may get very good results for wlan applications.
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 :
