At what distance from the antenna does the far field start?(a) 2 wavelengths(b) 5 wavelengths(c) 10 wavelengths(d) 25 wavelengthsI got this question in class test.I'd like to ask this question from Antenna Fundamentals topic in division Antennas and Wave Propagation of Avionics

At what distance from the antenna does the far field start?(a) 2 wavel

1.	At what distance from the antenna does the far field start?(a) 2 wavelengths(b) 5 wavelengths(c) 10 wavelengths(d) 25 wavelengthsI got this question in class test.I'd like to ask this question from Antenna Fundamentals topic in division Antennas and Wave Propagation of Avionics
Answer» Correct CHOICE is (c) 10 WAVELENGTHS Explanation: The far field that is approximately 10 wavelengths from the antenna is the radio wave with the COMPOSITE electric and MAGNETIC fields. For example, at 2.4 GHz, ONE wavelength is 984/2400 = 0.41 feet. The far field is 10 times that, or 4.1 ft or beyond.

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