At las time a lot of hits came from a Poland there are some good wifi forums but I cant find online translator 🙁
Here one interesting antenna from diy.wifi-live.pl
This is some strange Biquad and Yagi hybrid.
Dimensions :
/odległości:
deflektor- 36
/19
quad- 34
/17
direktor1 33
/17
direktor2 32
/17
direktor3 31
/17
direktor4 30
/17
direktor5 29
There are no results or testing for this antenna.
Another Yagi whit interesting design, this time from Dlink.
Original link : http://www.zero13wireless.net/foro/showthread.php?t=1150
PDF Specification : http://www.dlink-me.com/ftp/antennas/pdf/ANT24-1201.pdf
Gain should be around 12dbi.
And here it is what is inside : usual yagi directors are madded from aluminum /i think/ and pcb dipole used as feeding element.
You are wondering were did You saw similar dipole feeding ??? 🙂 I tell You : http://www.digdice.com/2007/09/28/sector-antenna-grad2487/
The feeding of the dipole is very similar.
Dimensions for this antenna :
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.