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The same argument also implies that if power is lost then it must flow out in the general direction that is broadside to the antenna. There is no power flowing in the endfire direction. In fact the magnitude of the radiated field varies as sin(&theta), where &theta is the angle from the endfire direction to the point in field. Notice that it is the currents in the antenna that contribute to the radiation field and not the charge in the antenna. Although this is largely a mathematical point, the currents are the quantities that are seen from a distance. This is only the broadside direction which lies in the equatorial plane of the antenna. From the endfire direction (aimed along the wires), we see no oscillating current whatsoever. This may seem a bit strange given that the E-field in the case of the transmission line does in fact propagate along the wires.
The following figure shows the antenna radiation pattern of the dipole antenna. The green line represents the antenna at the center of the pattern. The radius vector from the center to the pattern at any given angle represents the amplitude of the electric field in that direction. The pattern can also represent the magnitude of the power flux density of the wave as well, but this is proportional to the square of the electric field. The figure on the right shows a schematic view of the magnetic field lines surrounding the antenna. The radiation pattern of the magnetic field is exactly the same as that of the electric field.
The following figure shows the antenna radiation pattern of the dipole antenna. The green line represents the antenna at the center of the pattern. The radius vector from the center to the pattern at any given angle represents the amplitude of the electric field in that direction. The pattern can also represent the magnitude of the power flux density of the wave as well, but this is proportional to the square of the electric field. The figure on the right shows a schematic view of the magnetic field lines surrounding the antenna. The radiation pattern of the magnetic field is exactly the same as that of the electric field.
The following figure shows the antenna radiation pattern of the dipole antenna. The green line represents the antenna at the center of the pattern. The radius vector from the center to the pattern at any given angle represents the amplitude of the electric field in that direction. The pattern can also represent the magnitude of the power flux density of the wave as well, but this is proportional to the square of the electric field. The figure on the right shows a schematic view of the magnetic field lines surrounding the antenna. The radiation pattern of the magnetic field is exactly the same as that of the electric field.
Made 5 April 2004