Abstract
This paper is the first report of experimental researches on the wireless beam of short electric waves of few metres. The method of generating continuous waves of ultra radio frequencies is the same as already stated by the author in the J. I. E. E. of Japan. The electric intensities of the field due to the oscillator itself (without antennae and reflectors) are observed at first in various directions around it. In this case the plate and grid coils in the osc<llation circuit form the radiators of short radio waves. The distribution of electric field intensities in the horizontal plane containing the oscillator is not uniform in all directions and the maximum values of their vertical components exist in the directions of the plane of the plate and grid coils, but in these directions the horizontal component is negligibly small. On the other hand, in the directions normal to the plane of the plate and grid coils, the vertical component of the field intensi ies almost vanishes while the horizontal components show maxima in these directions, although their values are too small to compare, a the same operating conditions, with that of the vertical components in the former case. As the antenna or the radiator, a slngle brass rod of 2.2 metres in half wave 1 ngth. may be used and its effect upon the field intensities and distribution (around the cscllator) is observed, when the antenna is placed in various positions near the osc lltor. It is also stated that the unidirectional fiald can be easily obtained by the combination, of several antennae or radiators. For this purpose, a simple device is proposed three rod antnnae attached to the transmitting apparatus in a suitable arrangement, and the resints of experimental studies on this method are shown.
