US2008286A - Circuit connection for ultra short waves - Google Patents

Description

1935. A. mans I 2,@S 2% CIRCUIT CONNECTION FOR ULTRA SHORT WAVES Filed Au 26, 1952 INVENTOR AUGiS In? BY v /6 (UA/U P V ATTORNEY Patented July 16, 1935 CIRCUIT CONNECTION FOR ULTRA SHORT WAVES August Leib, Berlin, Germany, assignor to Telefunken Gesellschaft fur Drahtlose Telegraphic m. b. H., Berlin, Germany, a corporation of Germany Application August 26, 1932, Serial No. 630,560 In Germany October 5, 1931 Claims. (Cl. 250-36) 5 have been unsuccessful to build oscillation circuits of suitable mass and low damping in which the oscillations fed back into the grid of the tubes could be gradually built up by resonant rise. Particular difficulties reside in the fact that all continuous Wires, even when of short length are subject to marked falls of potential so that conductors of the conventional form cannot be used for oscillation circuits, couplings and feed-backs where waves of an order of 1 decimeter are to be employed.

This difiiculty is obviated according to the present invention by not using the customary continuous wires or strands for the design of oscillation circuits and supply leads, but rather noncontinuous or broken wires with capacitive bridges in which the inductance of the short pieces of wire terminating in small capacities are connected in series so that the capacities will adequately compensate the inductive fall of potential. By the aid of such chain systems it is feasible, even where Waves of a decimeter or less length are involved, to build oscillation circuits adapted to coupling,

Figures 1 and 1a illustrate an embodiment of the conductor according to this invention in two elevations at right angles to each other. Figure 2 illustrates another embodiment. Figures 3 and 4 show conductors of this type in use with oscillation circuits.

Referring to Figures 1 and 1a, a1, a2, a3, etc. designate metallic lamellae the end surfaces of which constitute the bridging capacities being in series with the inductances of the said lamellae. The said lamellae are secured in a suitable way to the insulation extension pieces 0 of an insulated support I).

Another embodiment is shown in Figure 2 where the units a of the chain system are attached to the insulation support b directly by means of their bent-off extensions a.

It will be understood that the above exemplified embodiments do not exhaust all feasible forms of practicing the basic idea of the invention; both the mode of securing as well as the form of the constituent links or units of the chain system may be varied widely.

The use of oscillation circuits according to the invention in connection with a thermionic generator tube is shown by way of example in Figures 3 and 4.

Figure 3 shows a direct mode of coupling of the radiating dipole ee with an oscillation circuit dd of the invention, the midpoint of which is associated with the hot cathode or filament it, one end of the latter being joined to the plate A and one pole of a condenser f while its other end is connected with the grid g and the other pole of the said condenser. The oscillation circuit (1 may be disposed either inside or outside the tube, the former example being shown in Figure 3 where h denotes the glass vessel. For the coupling capacity it will not be absolutely necessary to provide a distinct condenser, for under certain circumstances it would also be appropriate in this case to use therefor also a partial capacity of the oscillation circuit d itself which, as will be noted, comprises a plurality of series-connected condensers.

Figure 4 shows an inductive coupling between dipole cc and the generator in which scheme the oscillation circuit dl designed in accordance with the invention and united with the tube electrodes in a way as shown in the previous instance, is brought to act inductively upon a similar oscillation circuit (12 united with the dipole ee. If oscillation circuit (12 is located outside the bulb of the tube the coupling degree and thus also more or less the wave length can be regulated by a change in position in reference to the other parts of the generator.

I claim:

1. An oscillation circuit for ultra short waves of the order of a meter and less comprising an electron discharge device, an oscillatory circuit for the electrodes of said device comprising a conductor constituted by a series of physically sepaanode, cathode and control electrode, an electrical conductor comprising a series of capacitive bridges in the form of short, physically separated, metallic sections which overlap in their lengths, the terminals of said conductor connecting together said anode and control electrode. and the midpoint of said conductor being joined to said cathode.

3. An oscillation generator circuit for ultra short waves of the order of a meter and less comprising an electron discharge device having an anode, cathode and control electrode, an electrical conductor comprising a series of capacitive bridges in the form of short, physically separated, metallic sections which overlap in their lengths, the terminals of said conductor connecting together said anode and control electrode, the midpoint of said conductor being joined to said cathode, and a dipole antenna comprising two aerial elements whose adjacent ends are connected to the terminals-of said conductor.

4. An oscillation generator circuit for ultra short waves of the order ofIa meter and less comprising an electron discharge" device having an anode, cathode and control electrodea circularly shaped electrical conductor comprising a series of capacitive bridges in the form of short, physically separated, metallic sections which overlap in their lengths, the terminals of said conductor connecting together the anode and control electrode, the midpoint of said conductor being joined to said cathode, and a utilization circuit inductively coupled to said conductor through another similarly'constructed conductor also of'circular shape. 5. A circuit for use with ultra short waves of the order of a meter and less comprising an electron discharge device having electrodes connected together by a conductor constituted by a series of physically separated, short, metallic wires whose lengths overlap, said short wires forming serially coupled capacitive bridges whereby there is obtained an overall conductor comprised of capacities which compensate for the inductive fall of potentials therein.

. AUGUST LEIB.

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