Do Cantennas really work, and how?
Yes they really do work very well.
The purpose of putting metal around the collector/emitter (active element), is to collect and direct all of the radiation to and from one direction.
The active element radiates the electromagnetic waves spreading away from itself. The waves radiated towards, and collected from, the back of the antenna, are re-transmitted forward again.
Because of the careful placement of the element, the reflected wave from the back end superimposes the collected signal on the active element, concentrating and thus strengthening it. The element is naturally forced to radiate all of the signal towards the open end of the antenna, effectively concentrating the radiated power in one direction.
If the element is not placed at a precise distance from the back of the antenna, the constructive interference will not occur, reducing the effective directional gain. Moreover if the waveguide’s length is less than ¾ wavelength, the radio wave won’t be completely collected for concentration, or precisely directed for radiation.
In addition the diameter of a waveguide determines the size and therefore the frequency of the radio waves that are able to enter.
This helps to quiet undesirable interference.
What is the effective range?
Range completely depends on signal obstructions. 2.4Ghz radio waves are considered "line of sight". In other words just about everything tends to block the signal.
The FCC limits WiFi power to 1 watt and only intended WiFi to be an extremely short range service.
1000 to 1500 foot is a practical working limit for one watt of output through open air without obstructions at this frequency.
A connection means nothing if the data rate is too
slow. Don't be fooled by some outrageous claims.
At a distance, minor foliage and angled glass can block the tiny radio waves.
Construction materials and furnishings also play a huge part in determining the ability of signals to penetrate within, and ultimately the pathway taken through your home or other buildings. The physical placement of your equipment affects the range.
Large, and well-built homes are best served with a combination of wireless and powerline equipment. My routers and antennas are great assets in this quest for complete coverage.
My routers are among the very most capable you can get, if when equipped with my optional directional antenna you cannot connect, it is highly unlikely any other router will be able to.
Keep in mind that with the optional DD-WRT firmware, each of my routers can also serve as a powerful client or repeater further extending the range of your wireless network.
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