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one is excited by a r.f. generator connected to it, and the other by the
electromagnetic waves created by the former. The factors that make
for most effective radiation in any particular direction are identical
with those for the strongest reception from that direction, so
whatever is said about antennas as radiators can readily be adapted
from the reception standpoint.
17.8 Radiation Resistance
We have noted that the dipole antenna, like the quarter-wave line from
which we developed it, has inductance and capacitance. What about
resistance? There is of course the resistance of the metal of which it is
made, together with the various source ...