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![]() "Richard Fry" wrote ... On Sep 21, 12:23 pm, Szczepan Białek wrote: You only do not realize that EM waves can start from the ELECRIC field. The electric field is radiated from the ends where is high voltage and no current. No, Szczepan, it is you that does not realize that voltage, alone, cannot produce an Let us assume that electromagnetic field is a proposition by Maxwell. The electric field is more realistic. Only the change in current and charge flowing along a conductor, over time, produces far-field EM radiation. That radiation includes both the magnetic and electric fields, at right angles to each other and to the direction of travel. It is untrue that one part of a conductor or antenna radiates the magnetic field, and another part radiates the electric field, no matter the claims of the proponents of the E-H antenna (which have not been demonstrated). But it is experimentally proved. Stationary charge - electric field, Moving charge - magnetic field. Probably the both fields are the same. Only instruments are different. The fact that the ends of a dipole, and the top of a monopole have very little net current flowing means that those locations cannot contribute very much to the EM radiation from those antennas. But there are the doubled voltage. Very strong pulses must appear in space. You really should form your opinions from research in modern textbooks on antennas, rather than using Wikipedia and inapplicable analogies to sound waves. At a minimum you could recognize the quotes from them on this subject that already have been posted here. Up to now the acoustic analogy is fully applicable. S* RF |
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