GB558852A - Improvements in directional aerial systems - Google Patents

Abstract

558,852. Directive wireless signalling. MARCONI"S WIRELESS TELEGRAPH CO., Ltd., and GREEN, E. May 21, 1942, No. 6926. [Class 40 (v)] A directional aerial system comprises a plurality of spaced dipole aerials Ai in a common plane and with their centres on a common straight line, each dipole having associated therewith a reflector Re and one or more directors Di, all the reflectors being on one side of the dipoles and the directors on the other, the spacing of the reflectors and directors being the same as that of the dipoles, one half of each dipole being connected near its centre to one feeder and the other half to the other feeder. The dipoles may be spaced apart by a half or whole wave length. The dipoles, reflectors and directors may be metal rods, adjustable in length and secured directly at their centres to a metal mast Mi or metal brackets Bi. In Fig. 3, open-wire balanced feeders are. used but the feeder may be enclosed inside the mast, if the latter is tubular, insulating glands being provided through which connections are made to the dipoles, Fig. 4 (not shown). A number of dipole systems such as shown in Fig. 3 may be arranged side by side and fed in phase.