- Height x Diameter = 3.3 inches x 1.4 inches
- Test Frequency: 900 MHz (Wavelength = 33 cm or 13 inches)
I see some conflicting formulas to calculate the near field distance for an antenna w.r.t. the frequency of interest.
Method 1: (multiple sources)
Reactive Field <= 0.63 x sqrt(Height^3/Wavelength) ===> 2.6 cm or 1.02 inches
Reactive Field <= Wavelength ===> 33 cm or 13 inches
Which one applies here accurately.