wjglynn

While you are waiting for Steve to comment, did you make it to page 6 of this thread? Steve corrected his earlier formula typos and sent me the post below.

Bill:
I should have been clearer on this.
The main equation you need is setup is below.
Wavelength and frequency are related by the following formula: c = l * u * √er,
Where: c = speed of light
l = wavelength
u = frequency
er = relative permittivity
In this case er = 1
Now by rearranging as to solve for (l)
you will then find for 2.4Ghz the wavelength is 0.1429m were m is in meters.
for 2.45 Ghz the wavelength is:
0.1224 m
122.3643 mm
0.4015 f
4.8175 inch

m = meters
mm = millimeters
f = foot
inch = inch or "

Now total length and width of the plate will be 19.27"
The antenna will be centered at 9.635"
Remember to use ½” nilon stand offs and hardware to mount the antenna. To the plate.
When you get to the cable length let me know and I will do the calculations for you.
Hope this helps.

Steve