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Circular waveguide antenna calculator - JavaScript
instructions and Plans to build a cantenna array with 4 cantenna's for extreme gain.

WiFi Video Tutorials Here
  • D is the interior diameter of the can
  • Lo is wavelength in open air = 0.123 metres
  • Lc is wavelength at lower dominant mode cut off frequency
  • Lu is wavelength at higher dominant mode cut off frequency
  • Lg is standing wavelength inside can

Lc = 1.706D

Lu = 1.306D

Lg = 1 / (sqr_rt{(1/Lo)2 - (1/Lc)2})

Calculated useing 2.437 ghz (channel 6) for center frequency:

  • Lower cut-off frequency should be lower than 2400 MHz
  • Upper cut-off should be higher than 2480 MHz

D in mm
 

Lower cutoff frequency in MHz

Upper cutoff frequency in MHz

Lg in mm

Lg / 4 in mm - needed to make can

3Lg / 4 in mm

Lo / 4 in mm - needed to make can

Circular waveguide antenna.
Circular waveguide antenna showing design values, click to enlarge.

92mm is the optimal diameter if you want to try to optimize it for flattest response across Channels 1-11
this is because it minimizes the difference in the probe position between Channels 1-11
about 2.63mm, so the SWR curve across the WiFi band is flatter.



Lc = 1.706 x D
Lo = 300/F
Lg = 1/((sqrt(((1/Lo)^2)-(1/((1.706*D)^2)))
1/((sqrt(((1/123.102174805)^2)-(1/((1.706*92)^2)))
198.441883 / 4 = 49.6104707


build a 4 barrel cantenna array

Here is something that you may want to try.
1 cantenna = 12 db -- 16X
2 cantennas = 15 db -- 32X
4 cantennas = 18 db -- 64X
things you need to know are:
makeing the cophase harness
how far apart to mount the cans
this is how i did it and it really works.
cophasing beams you need an odd multiple of 1/4 wavelength coax.
i use RG6 with crimp on F-connectors.
velocity factor of RG6 is .82 (-- 300/f=123.102mm X .82=100.943mm /4=25.2359mm --)
i used 11 -- quarter wavelengths 277.595mm so i cut the coax "shield to shield" 10 15/16"
to make the combiner i used a 4-1 diseqc switch . had to tear it apart gut it out and rewire it this way.
the short coax pieces are RG58/u "velocity factor=.66" cut to 20.3mm or 13/16" is close eanugh.

modified diseqc to wifi cophase combiner build the center solder point first
flux and heat needed ------->
wifi 4 cantenna combiner f-connector wifi cantenna probe
female F-connector
used for probe

The distance between the cantenns "center to center"
54/beam width * Lc
beam width of cantenna is 30 degrees
54/30*123=221.4 mm


wifi 4 barrel cantenna stack

correctly spaced cophased antenna array
incorrectly spaced cophased antenna array
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June 25, 2017