GB578586A - Ultra-high frequency electronic devices - Google Patents

Abstract

578,586. Discharge apparatus. STANDARD TELEPHONES & CABLES, Ltd. July 10, 1942, No. 9606. Convention date, July 11, 1941. [Classes 39 (i) and 40 (iii)] - An electron stream which interacts with a cavity resonator 12, Fig. 1A, is introduced into the resonator by a small tubular section 2 of wave-guide, so proportioned that its critical frequency is higher than that of the energy generated in the resonator, whereby leakage of energy through the tube is prevented. The field within the resonator may have its component of electric field parallel, as in Fig. 16, or perpendicular, as in Figs. 3, 8 and 10, to the initial direction of the beam ; in the latter case, the field may rotate, Fig. 1A, and the electron beam may be given a swirling motion to keep up with the field, a magnetic field 'being added in some cases. To reduce the velocity which must be imparted to the beam to enable it to cross the resonator in the time of a half-cycle, the resonators may be of pinched shape such as is shown in Figs. 11, 12 and 15. In the form shown in Fig. 1A, the rotating field is maintained by loops 18 ... 21 fed with voltages in quadrature; when the device is working it is stated that the rotating field is maintained by the electron beam alone. The electron stream is generated by cathode 6, grid 7 and anode 8. The magnetic field may be produced by a flat coil 27 or a long solenoid 26, or by a permanent magnet.