The distribution of ultra-high-frequency currents in long transmitting and receiving antennae

The distribution of ultra-high-frequency currents in long transmitting and receiving antennae is considered analytically, and experiments are described which were undertaken to test the conclusions arising from the theoretical analyses. With an isolated transmitting antenna energized at any point, the current is found to be distributed sinusoidally in the two parts of the antenna which are separated by the point of energy input. The currents in the two parts are dependent upon each other in a manner determined by the approximate equations (3) and (4) in the paper. With an isolated receiving antenna energized by a uniform electromagnetic field, it is found that the current distribution is such that current nodes occur at intervals of one wavelength measured from both ends of the aerial. The distribution is given approximately by equation (5) in the paper. ¿End effects¿ and modifications produced by the experimental methods used are also discussed.