Cantennas are typically used to increase the range (or discovery) of Wi-Fi networks.
The cylinder portion of the can may consist of metal-coated paperboard.
Although some designs are based on a Pringles potato chips can, this tube is too narrow to increase the 2.4 GHz signal by a useful amount, although at 5 GHz it would be about the right size. However, a cantenna can be made from various cans or tubes of an appropriate diameter. Some designs include a pole mount to elevate the cantenna.
At 2.4 GHz, losses can occur if the cable from the cantenna to the Wi-Fi circuitry is too long. A more efficient cantenna can be made by minimising this length or connecting the cantenna directly to the Wi-Fi circuitry.
Cantennas are typically used for extending a wireless local area network (WLAN).
The tiny design makes them ideal for mobile applications such as wardriving.
A cantenna can be used as a satellite dish feed horn. The 5.5 GHz cantenna dimensions are almost perfect in that they make a good fit for the standard TV satellite dish. The resulting setup is a low-cost high-quality high-gain antenna. Such setups are widely used in wireless community networks for long-distance Wi-Fi links.
Cantennas can also be used for SETI with minor modifications: in this case the cap is left in place so water can't get in and a small hole drilled so any moisture may drain out. This can be used with an existing satellite TV dish if it is in a good condition.
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- Cantenna.com User Guide
- Extend your wireless network by building a Wi-Fi cantenna
- Amateurlogic Episode 3 (Construction details for a more efficient cantenna)
- Waveguide Can-tenna
- Youtube video on How To Build A low loss Cantenna
- How To Build A Tin Can Waveguide Antenna
- Do-It-Yourself Wireless Antenna Update
- Cantenna Calculator
- How to build Cantenna (Video)