# Coffee Can Wifi

This is how I made a usb cantenna with a coffee can. Simple and effective enough to gain 1 or 2 bars. Sorry bout the cr@ppy pics.
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## Step 1: Materials & Tools

Items needed:

11.5oz coffee can
Metal hanger

Tools needed:

Razor knife to cut can with. I'm not blessed with a dremel. :(
Sharpie
Ruler
Needle nose pliers and/or wire cutters
Duct tape because it has a light and a dark side

## Step 2: First, some math.

My 11.5oz coffee can is: Laura Lynn Hazelnut creme (naturally & artificially flavored)
hell yea hazelnut bro

Inside Length 5 5/16 in.
Outside Length 5 7/16 in. (not used)
Inside Diameter 3 15/16 in.
Outside Diameter 4 in. (not used)

And we know:

1 inch = 25.4 mm
and
1/16 in = 0.0625 (decimal)

So, to use the calculator I found here: http://www.saunalahti.fi/elepal/antenna2calc.php
I needed to do some simple English -> Metric conversion.

Inside Length 5.3125 in x 25.4 = 134.9375 mm ~ 135.00 mm
Inside Diameter 3.9375 in x 25.4 = 100.0125 mm ~ 100.00 mm

The calculator gave me these figures for my project.

Target distance from bottom = 46 mm ~1.811 in ~1 13/16 in
Target depth of insertion = 31 mm ~1.220 in ~1 1/4 in
Target length of can = 138 mm my can is 135 mm. Difference negligible

Hey, I know it was for a real antenna with a Type N connector, but that just simply wasn't available to me. The principle is still the same nonetheless.

My Belkin Wireless 802.11b USB adapter/dongle: 3/8 x 1 5/8 in

greaaaaaaaat job !!!! please can you help me to make a cantenna for cdma evedo

1.9 ghz ?????? !!!!!!!

Phil B5 years ago
I have a WiFi card for a PCMCIA slot. What would you do to adapt this basic antenna for use with my card? I went for decades without a Dremel. I thought I would never use one. Then I inherited the one belonging to my father-in-law after he died. I am amazed at how much I use it. See my Instructable on enlarging the arbor hole in a saw blade so it fits a Sawsmith radial arm saw. Let family and friends know you would like to save cash gifts until you can buy one.
Slinkyfied (author)  Phil B5 years ago
I don't think this cantenna design would be suitable for a pcmcia type card, but... there's always a 'but'... I've googled it and found a 'corner antenna' involving a slim cd case, library card, some tinfoil, and glue. If that type of antenna works, I guess one could potentially use other common types (parabolic) with some success, also. Another idea I had was wrapping some copper wire around the end of the card a few times and leaving the end up as a sort of dipole. I'm new to antenna building/design, so don't take my word as gospel, but if you try anything that works, spread the word. Good luck to you!
5 years ago
Thanks for the reply and the information.
3 years ago
if you can open the end casing on the card, there MAY be a hidden pigtail connector. if there is, you could get the corresponding pigtail connector for your card, make a hole to keep it exposed, and then use a google search to identify the manner of pigtail you need. then its a simple matter of hitting up a local shop or online shop or ebay to find it!
CaseyCase5 years ago
Ingles rules! Slinkyfied, you live in WNC?