estqwerty’s wifi antennas

Found on http://www.zero13wireless.net/foro/showthread.php?t=3964

I cant find original site of this antenna there is links on Zero13wireless forum.

I cut a lot of coax without any success before time in attempt to make a coax omni antenna.

This thing here is looking different. But maybe will work.

This is the idea :

30mm in the beginig 1/4 wave - may be patching section.

40 mm of outer of coax is used to dephaseing sections.

60 mm sections as 1/2 wave radiators.

And that is.

Quasi Log Periodic End Fire Array (QLP) Feed Antenna

Specification :

http://www.calamp.com/pro_mmds_130093-130120.html

Page 5 lan23.ru
http://www.lan23.ru/forum/showthread.php?t=5&page=5

http://www.wireless-homebrew.com/wireless/page04.html

russians again

http://www.nag.ru/2003/0110/sirco-text.html

some pictures :

http://hft.uni-duisburg-essen.de/INICA2007/2003/archive/inica_2003/P06_Ibrahim.PDF

One of these build on lan23.ru

Here dimensions of my one :

http://www.digdice.com/2008/02/07/qlp-antenna/

How to make our own reflector :

http://www.digdice.com/2007/08/31/diy-hi-gain-antenna-on-cheap/

http://www.essexrepeatergroup.org.uk/gb3cms.htm

Horizontally Polarised Omnidirectional Slotted Waveguide
10-slot winged K5SXK/WA5VJB based design

Also interesting radome is build.

Here are the pictures.

Now using wings we getting bigger ground plane - ro this is writen in big books - i must try this some time.

I lake the radome too it is simple to make.

And as final we get quite strange shape for this antenna , I like this too.

What is Polaplexer ?

“… The Polaplexer is a microwave antenna, or antenna feed, which supports two
simultaneous inputs or outputs that are independent and isolated from each other by use
of orthogonal (at right angles) linear polarization. The isolation can be as much as 30 -
35 dB. Its main use is to permit full duplex operation with a single antenna, in which one
port is used to transmit and the other to simultaneously receive. As long as the transmit
power input to the Polaplexer is limited to 100 milliwatts or so, the receiver input stages
are unlikely to be damaged by the transmitter’s continuous output. …”

I never met this thing before it just came out from no were ! If anybody was tried this please post a comment.

http://www.ham-radio.com/sbms/sd/ppxrdsgn.htm

For me is interesting can I use two wifi cards working on different channels with one antenna and this thing?