GB660367A - Magnetron for ultra-short electro-magnetic oscillations - Google Patents

Abstract

660,367. Magnetrons. PATELHOLD PATENTVERWERTUNGS- & ELEKTROHOLDING AKT.-GES. Aug. 16, 1948 [Aug. 16, 1947], No. 21565/48. Class 39 (i). A magnetron for ultra-short waves comprises concentrically enclosing the cathode_at least two annular hollow cavity resonators whose inner walls consist of interdigitating segments; the cavity resonators are mutually coupled so that the sum of the oscillatory magnetic fluxes surrounding the cathode is zero. The loss of high - frequency power through the cathode is thereby minimized. As shown, two cavity resonators 2, 3 are separated by a common wall 12. The anode segments 4 surrounding the cathode 1 are connected alternately to the common wall 12 and to the end walls 13, 14. The segments connected to the end walls are as shown connected together, or they may be separate. The leads 5, 7 of the output leads 5, 5, 7 are connected directly together. They may be connected together inside the envelope and the two leads emerging from the envelope arranged cross-wise with the cathode heating leads. Alternatively the cavity resonators may be coupled together by a wire 50, Fig. 5, passing from one resonator to the other through the common wall 12 and forming a loop in each. In an embodiment with three adjoining cavity resonators each with an output coupling loop connected to a concentric line, the resonators are coupled to oscillate with a mutual phase displacement of 120 degrees by means of capacitative couplings between the inner conductors of the concentric lines.