Patent GB-540232-A (GB)
Title: Electrical high frequency wave transmission systems
IPC: H01J21/02
Filed: 1940-04-19
Abstract: 540,232. Electron oscillators. STANDARD TELEPHONES & CABLES, Ltd. April 19, 1940, No. 7093. Convention date, Feb. 19, 1939. [Class 39 (i)] In ultra short-wave apparatus used as a transmitter, receiver or repeater an electron stream passes across an opening or openings in a hollow metal resonator or resonators arranged at the side of the electron stream; a beam of electrons from a gun or the rotating stream in a magnetron or magnetrons may be used. One magnetron represented by the filamentary cathode 1, Fig. 4, and divided anode 5 may be used with a number of resonators 7, or a number of magnetrons 1, Fig. 5, may be arranged around a single resonator and sets of such magnetrons may be arranged along the resonator at multiples of half wave-lengths as shown in Fig. 7 ; each magnetron may have grid and control electrodes. To tune the resonators adjustable pistons may be used or the resonator is deformable by pressure along the lines 15, Fig. 3, at right-angles to the long dimension of the resonator. The resonator has an opening additional to its connection 11 to the magnetron for radiating or receiving energy ; when two or more resonators are used with a single magnetron only one may have such an opening while the other is adjustable for tuning. Long resonators 20, 21, Fig. 8, are formed in a single tube 22, and with a central split anode magnetron 25, 26; the tube is supported by the flat rods 33 acting as leads to the anode segments through the metal blocks 23, 24, which divide the tube 22 into the two chambers. The resonator 21 has an orifice 29 in its end parallel to the opening at the magnetron end. Angle brackets with a washer 36 allow the end of the tube to move in the support rods. The cathode is supplied from rods spaced from the tube 22 and in a plane at right-angles to the rods 33. A glass envelope 30 encloses the resonators etc.; the envelope is evacuated, a getter 38 being provided. In a modification, more particularly useful as a repeater, the resonator chambers formed in the tube 48, Fig. 9, are closed by vitreous partitions 46, 47 in the vitreous ends 42, 43. Extensions 44, 45 are connected to these ends ; the extensions may be connected to di-electric guides. A metal coating 50 on the ends 42, 43 ensures conductive continuity between the resonators and the extensions. Slotted ends to the tube 48 allow for adjustment due to temperature changes. The magnetron anode may be formed by the inner surfaces of the blocks 23, 24, Fig. 14, or by a hole in a single block 59, Fig. 15; the outlet 55, Fig. 13, from the magnetron need not extend the full length of the anodes. Cooling channels, may be provided in the blocks 23, 24, 59. In use the envelope 30, Fig. 17, fits into the end of the dielectric guide 71; an electromagnet 70 supplies a field parallel to the filament 26. An adjustable plate potential is supplied by the generator 73, one lead from which contains one winding of a transformer 79 connected to the device 80. This may be a loud speaker when the apparatus acts as a receiver or it may be a modulator when transmitting. Ammeter and voltmeter 77, 78 are shown.