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Quick and dirty USB wifi dongle waveguide

Quick and dirty USB wifi dongle waveguide

This is a five minute fix to stealing neighbour net, it's not that pretty but it's simple and rather effective, plus it's fully adjustable for angles of up and down, not just side to side. 

I haven't bothered with Db gains because if you're serious enough to care about them then you've got the wrong waveguide, this will however take a just out of reach network and make a decent connection possible. 

Disclaimer - This project involved stabbing things with sharp things to make more sharp things, the edges of the can can be very sharp and I cannot be held responsible for any damage done to yourself, those around you or any passing badgers. 

If you liked this instructable then please vote for it in the USB contest, which is in the voting stage now!
 
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Step 1Tools and Materials

Tools and Materials
There's not much to the list, you'll need:

Materials:
 - Gorillapod, glue, a stick, a piece of string, you don't have to mount it on the gorillapod but my camera's too heavy for it so it was unused and I planned on doing some hunting for the best network so adjustability and stability are nice
 - A USB dongle, the stick kind, if it has an external aerial this would still work, you could also slide the can over any stick aerial to direct it I suppose. 
 - Some tape, electrical tape or anything thick works, I used awesome caution tape.
 - A sweetcorn can, they're fatter, though the large size bean cans would also work well

Tools:
 - Knife

Optional tools include any nicer way of cutting holes in cans, me I just got stabbin'

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37 comments
Oct 17, 2010. 2:12 PMyogy2020 says:
It's work with me thank you so much.
I am using coca cola can. And it's funny :)
I was have 20% signal strinth But NOW I have 39% :)

'D-E/ DDG G0G 'D*,1(G %4*:D* E9J
%3*./E* 9D() CHD'
H2'/ 'D(+
Oct 18, 2010. 12:52 AMyogy2020 says:
You welcome :)
Jun 18, 2010. 7:55 PMlegless says:
If you have a Dremel and a thin cutoff disc it will make short work of a can and the edges will be far less jagged and there will be less blood. LOL.
Jul 12, 2010. 9:02 AMMrCantThinkOfAName says:
I just made one of there, but i dont have one of the tripods, but i used a dremil with the smallest blade i had and i just covered the edges with a tiny layer of gorilla glue xD
Jun 18, 2010. 1:54 AMStuNutt says:
Nice, simple antenna! Couple of suggestions here though:- You don't need the top of the can to be open, so try a coffee tin, large as you like (!) and re-fit the lid after you've finished. (Larger can will give more gain)

The cylindrical body of a large soft-drink bottle or similar could be used to make the whole thing "prettier" but also make safe those sharp edges. Leave the bottom on the soda-bottle and fit it over the can with the base at the top of the assembly, and the cylindrical part of the bottle extening well beyond the bottom of the assembly, as a "skirt" to keep the rain out and make it usable outdoors.

With the antenna outside of the building you will get a much better signal.

I have my wireless access point near the front of the house (because that's where the cable enters), and my ham radio shack at the bottom of the garden, and the signal is not bad, but could be better. With this on the roof of the shack, I think I'd get the full Wireless G throughput - and also maybe help to avoid any interference from the WiFi on my ham band reception.
Jun 13, 2010. 7:48 PMediz says:
Could I use a Pringles container? It would be easier and safer to build.
Jun 18, 2010. 7:53 PMlegless says:
Actually there are plenty of Pringles "cantenna" designs out there on the net. Both external versions and reflector ones like this.
Jun 17, 2010. 11:10 AMbotnot says:
digame mas del (the cone). botnot
Jun 15, 2010. 2:10 PMbotnot says:
It is a ! botnot
Jun 17, 2010. 11:09 AMbotnot says:
sorry, I meant "it Is a reflector!" botnot
Jun 17, 2010. 11:08 AMbotnot says:
mande?
Jun 13, 2010. 3:00 PMbotnot says:
Hi, For the edges of the can, one can get some model airplane clear fuel tubing, (or similar 1/8" or 3/16" diameter rubber tubing), slit it on one side and glue it over the rough edges. Also a slit can be cut in the bottom and the usb adapter slid to various distances from the apex to fiddle with the sensitivity and power. Also, a 'square can' offers a wider aperture and may pull in more signal strength. botnot
Jun 14, 2010. 3:13 PMbotnot says:
Actually, I usually use an adapter, (or a 14 dB antenna), free standing on a flat surface and then fold foil maybe 2' x 1'. I fold the edges over in 2 1/2'' folds on all 4 sides for rigidity, and then fold it vertically in the middle of the long side and set it on the surface. I use about a 135 degree opening and can just slide the foil to adjust the gap. I have also glued foil to, (for example), the cardboard back of a desk calendar and bent it to 135 degrees. I can aim these easily and fudge the adapter/antenna location easily. I also used a gorilla tripod and the lid of a large coffee can for a surface and worked off that. I like your can idea as it is rigid and stronger. Right now I have internal laptop wifi and don't need the adapter, so I am not using reflectors. If you haven't, check out www.seattle-wireless.com for wifi antenna and reflector ideas. Also google or . I have never seen an arrangement like yours, so it is very creative and unique to me. By the way, Engenius and Ubiquity have infinitely stronger wifi adapters and they are not too expensive. I get a huge signal gain with engenius. The power is very high for pc or laptop, and reflectors make it all the stronger. thanks, botnot.
Jun 13, 2010. 4:45 PMwsgraham says:
Good job. It doesn't have to be pretty to work and it sometimes doesn't even have to be 100% spot on to get the increase you need. Parts list should probably include band-aids. As an alternative, you could encourage your WiFi transmitting neighbor, I mean "provider" to fab up something like this to boost THEIR signal. http://cellar.org/showthread.php?t=22228
Jun 13, 2010. 3:02 PMbotnot says:
Oops, I forgot. REI in the states sells the Gorillapods cheaply in various sizes. botnot
Jun 11, 2010. 3:46 PMrimar2000 says:
Killerjackalope, you can multiply the signal strength bringing closer to the rear tin the dongle. More precisely, at half of the tin radius.
Jun 13, 2010. 10:08 AMrimar2000 says:
That's right. The focus of a spherical concave mirror (in this case cylindrical) is located halfway between the reflecting surface and the center of curvature. If the issuer is in focus, the reflected beam is parallel in theory, that is with zero dispersion. But being in the center of curvature, the dispersion is too large, 180 degrees. I would try an intermediate option, pulling up the transmitter to the bottom of the can. I hope that my "machine translator English " be understandable.
Jun 11, 2010. 3:51 PMrimar2000 says:
Please see http://farside.ph.utexas.edu/teaching/316/lectures/node136.html
Jun 13, 2010. 4:36 PMwsgraham says:
You need an "L" at the end of he string. http://farside.ph.utexas.edu/teaching/316/lectures/node136.html
Jun 12, 2010. 7:19 PMnickodemus says:
Nicely done! As a fix to sharp edges, some aluminum tape would work great.
Jun 11, 2010. 9:18 AMScott_Tx says:
From the look of it I'd say its more of a reflector than a waveguide
Jun 12, 2010. 10:17 PMYerboogieman says:
Allows packets to be sent as well as recieved.
Jun 11, 2010. 5:50 AMomnibot says:
Nice one, a useful and simple design, not to technical and threatening to a beginner.

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Author:killerjackalope(My website)
A northern ireland based maker that likes breaking stuff as well as fixing it, of no fixed abode for now Working PR for a club in Belfast and freelance photography. I enjoy working with computers,...
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