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Ron, when the conductors in a transmission line are close, much much
less than a wavelength, the currents, which are out of phase, create plus and minus EM fields that effectively cancel in all directions. As the spacing becomes greater and becomes a significant portion of a wavelength, the fields cancel in some directions but the spacing causes the phase to add in other directions. Under this class of conditions the line starts to become more like an antenna than a transmission line. As a point of further confusion, coaxial cables that have woven overbraid have a leakage inductance that allows some of the rf to leak out. So, even coax has some radiation due to leakage. Ron wrote: Can someone explain how a transmission line starts radiating as the separation between the center conductor and ground plane becomes greater and greater. SNIP |
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