estqwerty’s wifi antennas

This is just a interestng reading - no more availabe on intel site.

Comparing Licensed and License-Exempt WiMAX Technologies for Fixed Access.

Deploying-wimax-license-exempt-band

The idea for this one is very interesting - it is specially designed to NOT be madded on PCB.

The reason for this - you just can’t find right material to reproduce this splitter.

So we take what we have - and we have air - a lot of it! And we can calculate and simulate air as dielectric .

Splitter is based on Wilkinson power splitter theory.

and building of the splitter :

And final results :

On first look this look right and must work.

Some links for more info about building and pictures :

graycatt author’s page :

http://graycatt.livejournal.com/11833.html

lan23.ru page about NogiFroggy splitter :

http://www.lan23.ru/wifi/NogiFroggySplitter/NogiFroggySplitter.html

more abouth splitters :

http://www.digdice.com/2007/07/04/wlan-antenna-spliter/

Building dimensions :

http://www.lan23.ru/wifi/NogiFroggySplitter/Splitter_NogiFroggy_Doc.pdf 

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?

I believe anyone have this problem when some device hung and only solution is to restart it. This is my how to make this restarting automated.

A friend of mine build me this device to control some of my devices - AP and two adsl modems.

He writhed the script for OpenBSD / he is obsessed by this OS /and build this small and simple relay board.

“Just change script that test conditions and you can control almost everything that use power.Switch, Modems, Wireless AP, computers and of course the coffee machine :)”

More info on his site www.koychev.com

And for more useful explanations for the board and script on this post : http://www.koychev.com/Parallel-port-relay-control-for-OpenBSD