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Forums
Physics
Classical Physics
Electromagnetism
Estimation of E-field strength at a distance from dipole antenna
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[QUOTE="tech99, post: 6598517, member: 477979"] Assuming we are in free space and at some distance from the antenna, as mentioned before, the E and H radiation fields (not induction fields) decrease with 1/distance irrespective of the type of antenna. If we look at the induction fields close to the antenna, I have found in measurements that for a dipole we mostly see the electric field concentrated near the ends. We see a magnetic field mostly near the centre. I believe the electric field will fall with 1/D^2 near the ends and the magnetic field near the centre will increase with 1/D right up to the conductor. I agree textbooks say other exponents of D, but we need to know where in space this relates to. For greater distances we will see the contribution of E-field from both ends of the antenna, for instance, giving a more rapid fall off. For a slot antenna I found that the situation regarding the fields is approximately reversed. [/QUOTE]
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Forums
Physics
Classical Physics
Electromagnetism
Estimation of E-field strength at a distance from dipole antenna
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