Patent GB-483062-A (GB)
Title: Plate circuit element systems and plate oscillators for the generation of oscillations in the ultra-short wave range
IPC: H03B9/01
Filed: 1936-07-02
Abstract: 483,062. Valve generating circuits; thermionic valves; electric resonators. KASSNER, E. E. W. July 2, 1936, No. 18393. Void. Convention date, July 6, 1935. [Classes 39 (i), 40 (iii), and 40 (v)] An electric oscillator comprising oppositelyplaced plates as in Specification 417,564 is energized by connecting it to one or more discharge paths operating as negative resistances to sustain the oscillations. The discharge path 14, Fig. 9, has its electrodes coiinected to suitable points on the plates 10, 11, and may either lie between these plates or outside them, Fig. 8 (not shown). The plates 10, 11 may be within the same evacuated vessel as the discharge path, Figs. 10 and 11 (not shown). In Fig. 12, the discharge path comprises a triode valve 37 with capacity feed back between anode and grid, and with the necessary D.C. voltages applied to these electrodes through chokes 43, 44 to nodal points on the plates 33, 34. Leads connect the plate and grid to selected points on the plates. The valve may be arranged to oscillate as a dynatron or as an electron vibrator, and condensers may be interposed in the leads 41, 42, Fig. 13 (not shown). A split-anode magnetron may also be employed, Fig. 14 (not shown). The valve may be connected to the plates by a concentric tube conductor 75, 76, Fig. 15, the tube 75 being connected to one plate 71, either directly or capacitatively, and the inner member 76 being similarly connected to the other plate 72. The plates may be enclosed in a cylindrical member contacting with their rims forming either a conductive or capacitative connection between them, Figs. 17 and 18 (not shown). Fig. 20 shows a feed-back oscillator supplied from the mains transformer 126, and feeding the plates 118, 119 through a line 121 with several nodal points. The condensers 124, 125 may be omitted and the mains supply connected to the grid and anode leads at any of the nodes along the line 121, or along the plates 118, 119. The plates may be rectangular, Fig. 19 (not shown). In Fig. 21 a pair of valves 127, 128 are connected symmetrically to the plates 129, 130 ; this may be modified by connecting the anode of the valve 127 and the grid of the valve 128 to the upper plate, and the other electrodes to the lower plate, condensers being interposed in the grid leads, Fig. 22 (not shown). Two valves operating in push-pull relation may have their anodes connected to one pair of plates, and their grids to another pair, Fig. 23 (not shown). In Fig. 24 three superposed plates 146 . . 148 are used forming two pairs with dielectric layers 151, 152 interposed. The oscillator valves 149, 150 are of the vibrating electron type, one being connected to the pair 146, 147, and the other to the pair 147, 148. Coupling between them is afforded by a stirrup-shaped member 154. The oscillations may be modulated by a transformer 155. Several valves may be connected to different points on a single pair of plates, or a single valve may be coupled by branched leads to such different points, Figs. 25-27 (not shown). In Fig. 28 a valve is coupled to different points on the same plate 165, the leads passing through openings in the other plate 166. The plates 170, 171, Fig. 29, may be cut away at their centres to accommodate the valve 169. The grid is connected to one plate at 172, and the anode to the other plate at 173. The grid and anode may be of plane circular shape lying in the respective planes of the plates 170, 171 and connected to them by radial leads, Fig. 31 (not shown). The valve may operate as an amplifier with its grid excited from a separate source and its cathode and anode connected to the respective plates, Fig. 32 (not shown). Oscillatory energy may be taken from the plates to a load circuit by couplings similar to those described above for connecting the valve to the plates, Figs. 33-36 (not shown). In Fig. 37, an aerial 209 is connected to one plate and passes through an aperture in the other ; or aerials may be connected to the rims of the plates, Fig. 38 (not shown). Radiation may also be effected by making one plate larger than the other, Fig. 39 (not shown); or the plates 221, 222, Fig. 40, may be connected to cylinders 223, 224 for effecting radiation. In Fig. 41, the plates 227, 228 are within a vacuum tube 226, and a spiral cathode is supported in a recess in the plate 228. A positive grid 229 lies between the two plates, the upper plate 227 being connected to a low potential source 235. A load may be connected to the leads 236. The cathode may be of annular form and may rest on an insulating disc placed on the lower plate 228 ; and the control member 229 may be in the form of a ring, Fig. 42 (not shown). In Fig. 43, two spiral cathodes are housed in central apertures of the respective plates 246, 247 and a positive grid 248 is interposed. The cathodes and the grid may be of annular form, Fig. 44 (not shown) ; or they may be in the form of a double ring, the heating current passing in opposite directions to avoid magnetic effects. Fig. 45 shows a magnetron in which the plates 251, 252 forming the anodes have cylindrical curvatures 253 in the axes of which the cathodes 254, 255 are situated. An external magnet 256, 257 supplies the magnetic field, and leads 258, 259 supply the anode voltage and couple the oscillator to a load. The Specification includes diagrams showing the modes of oscillation of the plate element and a mathematical treatment of such oscillations and of the conditions necessary for coupling the plates to the discharge path or valve.