Wavelength (mm) ≈ Velocity of wave (Mm/sec) / Frequency (GHz)

w = v / f

We know v will be 300 (rounded up based on the speed of light mentioned above). For f, we need to plug in the Wi-Fi frequency.

You could just use 2.4, but in order to be a little more accurate, we will use two more decimal places. For channel 6 in the 2.4GHz spectrum, we need to plug in 2.437. Solving for w yields ~123mm.

w = 300 Mm / 2.437 GHz w = 123.102175

Now that we know the (w)avelength for our radio (f)requency, we can begin calculating the dimensions of the can based on the guidelines mentioned previously.