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Building the Cylinder (Can) Waveguide

We chose to build the antenna for 2.442GHz, or channel 7, as this is close to the center of the 13 channels available to us (US designs use channel 6 (2.437Ghz), as they have 11 channels). I have included a key lengths calculator in the form below. Nb.Rectangular waveguides use a different formulae (see Rectangular Waveguide).

Frequency
GHz
Diameter mm (Inside Measurement)
 
Free Space
Wavelength
mm
Waveguide
Wavelength
mm
Max
Frequency
GHz
Min
Frequency
GHz
Cut Off
Frequency
GHz
Probe Length mm
Open End to Probe mm (Open End to probe center)
Probe to Reflector mm (Probe center to Reflector)
Inside Length mm (Reflector to Opening)

The final product only needs to be accurate to about 1mm as this will only shift the frequency within the range of the 802.11 spectrum. A smaller cavity length will shift the frequency response to that slot to a higher channel. A longer slot cavity length will shift it down.

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