154results about "Multi-cavity magnetrons" patented technology

A magnetron comprising an anode portion having an anode cylinder and vanes, a cathode portion having a coil-shaped filament, magnetic poles disposed at the upper and lower ends of the filament, ring-shaped permanent magnets made of a Sr ferrite magnet containing La-Co, an input portion and an output portion. The diameter phia of the inscribed circle at the ends of the vanes constituting the anode portion is in the range of 7.5 to 8.5 mm, and the outside diameter phic of the coil-shaped filament 1 constituting the cathode portion is in the range of 3.4 to 3.6 mm.

An electromagnetic radiation source is disclosed. The electromagnetic radiation source includes an anode having a first conductor, a second conductor positioned relative to the first conductor, a plurality of pole pieces coupled to at least one of the first conductor and the second, and at least one mechanical phase reversal positioned along the first conductor or second conductor. Adjacent pole pieces are separated by a gap. The electromagnetic radiation source also includes a cathode separated from the anode by an anode-cathode space, electrical contacts for applying a dc voltage between the anode and the cathode and establishing an electric field across the anode-cathode space, and at least one magnet arranged to provide a dc magnetic field within the anode-cathode space generally normal to the electric field. Electrons emitted from the cathode are influenced by the electric and magnetic fields to follow a path through the anode-cathode space and pass in close proximity to the plurality of pole pieces, and the gaps between adjacent pole pieces provide fringing fields which interact with the electrons to produce single mode operation at a desired operating frequency.

Embodiments of the present invention generally provide a magnetron that is encapsulated by a material that is tolerant of heat and water. In one embodiment, the entire magnetron is encapsulated. In another embodiment, the magnetron includes magnetic pole pieces, and the magnetic pole pieces are not covered by the encapsulating material.

A magnetron in accordance with the present invention is configured so that an antenna lead (17) connected to a desired position of an anode segment (2) passes through a magnetic pole piece (7) and a metal cylinder (8) so as not to make contact therewith and is connected to the output portion (20) of the magnetron, and so that the electrical length L1 of this antenna lead (17) between the opening end of a third harmonic restraint choke (15) and the connection portion of the anode segment (2) is 1 / 2 of the wavelength (lambda) of the third harmonic, thereby restraining the third harmonic and the side bands of the third harmonic.

At an oscillation frequency of 2450 MHz band, number of the vanes constituting the anode part of the magnetron being, the diameter 2 ra of the circle inscribing tip portions of the vanes on the cathode side being 8.0 to 8.8 mm, the diameter 2 rc of the outer periphery of the filament constituting the cathode part being 3.5 to 3.9 mm, the height A 3 of the vane in the direction of the tube axis is 7.0 to 8.0 mm, the mutual distance A 1 between the bases of the pair of funnel-shaped pole pieces fixed to both sides of the anode part being 21.5 to 23.5 mm, the mutual distance A 2 between the bottom portions of the pair of pole pieces being 10.2 to 11.2 mm, the inner diameter P 1 of the through-hole of the pole piece being 8.3 to 8.5 mm, and the outer diameter P 2 of the bottom portion being 11.0 to 16.0 mm are set up.

Disclosed herein is a magnetron. The magnetron comprises an anode cylinder, upper and lower magnets provided to upper and lower portions of the anode cylinder, and upper and lower magnetic poles connected to the magnets, respectively. Each of the magnets has an inner diameter of 19˜21 mm, a thickness of 11.5˜12.5 mm, and an outer diameter of 50˜54 mm.

A magnetron is provided including a yoke having an inner space; a first magnet provided at one end of the inner space, a second magnet provided at a second end of the inner space, the second magnet being axially spaced from the first magnet. Further, there is an anode cylinder that generates a high frequency provided between the first magnet and the second magnet; a first pole piece and a second pole piece provided proximate first and second openings of the anode cylinder, respectively. Additionally, a seal that prevents outward leakage and has an inward protrusion extending axially toward the anode cylinder; and a choke filter, provided beneath a free end of the inwardly bent end of the seal to prevent outward leakage, may be provided.