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I understand the formula for calculating the far field distance from an antenna is:
Distance = (2D2)/λ
Is the D in the above equation the length of the antenna under test (antenna under test is a small PCB antenna)? In which direction (1 or 2 in the image below)?
Whilst trying to research this, I came across an image [Source]
But I was sure the formula for converting between wavelength and frequency was:
Frequency = 1/λ
Are there two formulas?
Are there two formulas?
No.
\$\large\frac{1}{f}=time\$ (of one period)
\$\large\frac{c}{f}=\lambda\$ (wave length in meters)
\$D\$ is the largest length on the antenna:
So, on a typical monopole, \$\frac{1}{4}\lambda\$
src. wikipedia
Based on your DUT image, (1), is the largest length.
