GB640251A - Improvements in coupled resonator systems suitable for use in electron space discharge devices - Google Patents

Abstract

640,251. Magnetrons. WESTERN ELECTRIC CO., Inc. Feb. 4, 1947, No. 3289. Convention date, April 5, 1944. [Class 39 (i)] In a magnetron having a plurality of cavity resonators surrounding and opening into a cylindrical cathode space, an annular groove is cut at one end of the anode segments to receive one or more straps 83, 84, Fig. 4, and the cathode space is shielded from the electromagnetic field associated with the strap or straps by the rising ends 79, 80, 81, 82 of the anode segments. Preferably there are two straps 83, 84 which contact alternate and intermediate anode segments by means of integral feet 85, 86 fitting into additional grooves 87, 88 on the floor of the main groove. Th may be duplicated at the other end of the anode structure. The straps ma rings, or may each have a single 7 (not shown), and are brazed or soldered to the anode segments. The anode 39, Fig. 2, is supported inside a casing 20 and extends therethrough, the heater leads being connected to rigid supports 43, 44, connected in turn to flexible leads 53, 54, Fig. 3, leading to terminals 24, 25. Polepieces 22, Fig. 2, are provided. The tubulation 51 is sealed to the tapered flaring edge 56 of a conductive bushing 57 attached to the casing 20. The outer tubulations 52 protects the cathode lead seal; the bore 55 has a hole, Fig. 1 (not shown), to permit ventilation around the seal. The tubulation 48, Fig. 2, is sealed to the tapered flaring edge of the conductive bushing 46 which forms the outer conductor of a coaxial output line whose inner conductor is 47, 61. A sheath is fitted over the flange 65 of the bushing 46 and opens into a wave-guide 27, Fig. 8, the free end 62 of the member 61 serving as antenna. The wall of the bushing 46 is tapered at 66 to provide a suitable impedance transformation. The wave-guide 27 has a coupling flange 67, Fig. 8. One of the cavity resonators may be tuned by a plunger 92, Fig. 9, fixed to a flexible diaphragm 93 and mounted on a threaded bolt 94 moved by a captive nut 95. The nut 95 has slots, Fig. 10 (not shown) for the reception of a screwdriver for tuning adjustment. Heatradiating fins are mounted on the casing 20, Fig. 1 (not shown).