Directional antenna system

Directional antenna system

Reddi
This invention is particularly adapted for the purpose of transmitting intelligence through space, especially by the use of short electromagnetic waves, as it is now well known that antennae capable of such transmission will produce strong radiation with the result that signals therefrom may be received at receiving stations at comparatively great distances away. In order to accomplish this object, aerials are located at a comparatively great distance from the ground, and are of considerable length or, on the other hand, grounded aerials of comparatively great vertical height are so excited or energized that they will oscillate on a wave length that is proportioned to the length of the antenna as one is to three-quarters or else as one is to a whole multiple of the wave length plus onequarter of the Wave length. Such a radiating antenna is usually attached at its upper end to a tall mast or tower from which it is insu lated and which tower is also insulated from the earth. Combinations of primary active aerial elements and units with secondary devices, e.g. with quasi-optical devices, for giving the aerial a desired directional characteristic using a secondary device in the form of a single substantially straight conductive element
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