GB217245A - Improvements in or relating to systems for the propagation and reception of hertzianwaves - Google Patents

Abstract

217,245. Levy, L. June 6, 1923, [Convention date]. Aerials; receiving systems; transmitting systems; filter circuits. - An aerial formed of magnetic material is provided with short-circuited windings in order to tune it. Fig. 3 shows a half-wave laminated magnetic reception aerial in which stationary waves are set up, short-circuited turns 3 being provided to allow the position of the node to be varied. A winding 4 serves to connect the receiving apparatus while the magnetic losses may be compensated by feeding back amplified currents to a winding 4'. Alternatively a generator may be connected to the winding 4'. The aerial may also be used for transmission and may be a closed magnetic circuit which may be provided with leakage shunt. The aerial may function as a wave filter, Fig. 9, showing a low-pass filter. The characteristics of the arrangement are controlled by varying the impedances connected to windings which may be applied to the lateral faces as at X<1>, Y<1> or may be disposed round the magnetic members as at A<1>, B<1>. The whole or part of the magnetic circuit may be surrounded by a conducting tube, which may be movable: The Specification as open to inspection under Sect. 91 (3) (a) comprises also a receiving frame 9, Fig. 12 (Cancelled), and tuning condenser 10, the frame being immersed in a liquid of high specific capacity, for example pure water. This subject-matter does not appear in the Specification as accepted.