US2435804A

US2435804A - Cavity resonator magnetron device

Info

Publication number: US2435804A
Application number: US516636A
Authority: US
Inventors: John M Spooner
Original assignee: RCA Corp
Current assignee: RCA Corp
Priority date: 1944-01-01
Filing date: 1944-01-01
Publication date: 1948-02-10
Anticipated expiration: 1965-02-10
Also published as: GB608952A

Description

Feb. 10, 1948. J. M. SPOONER CAVITY RESONATOR MAGNETRON DEVICE Filed Jan. 1, 1944 INVENTOR 7 m. fPOOflE-R C (I ATTORNEY focusing efiect of generated electromagneticwaves, as is well known in connection with ultra high frequency electromagnetic waves.

When the magnetron is set into operation, the

slot acts as a point or slit source of electromagnetic disturbance. The electrostatic field vector E is at right angles to the slit. Electromagnetic field vector H is parallel to the longitudinal axis of the slit. The E and H vectors form a plane which provides the wave front according to the classical theory. This wave is directed into the reflector and focusing portion of the envelope and directed out into space through the lens 40.

Thus it is unnecessary to provide any coupling devices or waveguides for directing the generated electromagnetic waves into space. At the same time the receiving equipment may be'well shielded from the effects of the pulse generated by the transmitting portion of the equipment with which 'my device may be used. By observing a proper ratio of leng'th-to-flare angle, it is possible to set up interference patterns which strongly reinforce a narrowly defined beam, while reducing spurious radiation lobes to a minimum. By disposing additional radiation sources within the structure in a suitable position, it should be possible to vary the direction of the central lobe of the transmitted wave by varying the phase rela tionship between the various sources of radiation, thus providing a means of scanning without mechanical movement of the radiating source.

While I have indicated the preferred embodiments of my invention of which I am now aware and have also indicated only one specific application for which my invention maybe employed, it will be apparent that my invention is by no means limited to the exact forms illustrated or the use indicated, but that many variations may be made in the particular structure used and the purpose for which it is employed without departing from the scope of my invention as set forth in the appended claims.

What I claim as new is:

1. A device for use at high radio frequencies and including an elongated envelope having at one end an electron source and a cavity resonator positioned adjacent said source to be excited by electrons therefrom, said resonator having an aperture therein, said envelope having an elongated flared out portion extending from said one end and registering with the aperture in said resonator, said flared out portion having a conducting inner surface and providing a reflecting surface and waveguide for electromagnetic waves generatedin said resonator, the end of said flared out portion being closed by a member permeable to electromagnetic wave energy.

2. An electron discharge device for use at ultra high frequencies and comprising'an elongated envelope, one end of said envelope being provided with a constricted portion and the remainder of said envelope being formed into an elongated cone-like portion closed at the outer end by a closure member permeable to electromagnetic wave energy, a magnetron electrode assemblypositioned within the constricted portion of said envelope and including ar anode member forming a cavity resonator and an electron source adjacent to said anode member for energizing the cavity resonator, said cavity resonator having an aperture opening into the cone-like portion of said envelope, said magnetron electrode assembly being supported from a closure member closing the'constricted portion of said envelope, said cone-like portion of said envelope having an inner conducting surface.

3. An electron discharge device for use at ultra high frequencies and comprising an elongated envelope, one of said envelope being provided with a constricted'portion and the remainder of said envelope being formed into an elongated cone-like portion closed at the outer end. a magnetron electrode assembly within the constricted portion of said envelope and including an anode assembly forming a plurality of cavity resonators and an electron source adjacent to said anode assembly for energizing said cavity resonators,

one of said cavity resonators having an aperture opening into the interior of the cone-like portion of said envelope, said cone-like portion of said envelope having an inner conducting surface extending toward the closed outer end.

4. An electron discharge device for use'at ultra high frequencies and comprising an elongated envelope, one end of said envelope b'eingprovided with a constricted portion and the re'mainderof said envelope being formed into an elongated cone-like portion closed at the outer end, a magnetron electi ode assembly within the constricted portion of said envelope and including an anode member forming a cavity resonator and an electron source adjacent to said anode member for energizing said cavity resonator, said cavity resonator having an aperture opening into the interior of the cone-like portion' of said envelope, said cone-like portion of said envelope having an inner conducting surface.

5. An electron discharge device having an en'- velope closed at one end by a cup-shaped member of conducting material, said cup-shaped member supporting an elongated flat electrode" structure having a free end embracing an anode assembly, a cathode insulatingly supported from said anode assembly, terminal members' extending through said envelope, leads for said cathode extending between said cathode andsaid terminal members for providing a circuit to said cathode,

the elongated flat electrode structure extending through said envelope and having provided at the outer end thereof a radiator, said elongated flat electrode structure having a passagewayiextending therethrough to the exterior thereof" for exhausting said envelope, and means included adjacent said anode assembly for providing a fixed magnetic field parallel to said cathode and in the space between the cathode and the anode.

6. An electron discharge device having. an envelope closed at one end by a cup-shaped member of conducting material, said cup-shaped member supporting an elongated flat electrode structure having a free end embracing .an anode assembly comprising an apertured portion providing a plurality of anode segmentsjdefining a central space, a cathode insulatingly, supported from said anode assembly, terminal members. extending through said. envelope and connections extending between said cathode. supports and said terminal members, the elongated fiat electrode structure extending through said cupshaped member and having provided at the outer end thereof a radiator, and means included ad- J'acent said anode assembly for providing a fixed magnetic field parallel to said cathode and in the space between the cathode and the anode segments.

7. An electron discharge device having an envelope closed at one end by a cup-shaped member of conducting material, said cup-shaped member supporting an elongated fiat electrode structure having a free end embracing an anode assembly comprising an apertured portion having a plurality of radially directed anode segments, a cathode insulatingly supported from said anode assembly, the elongated flat electrode structure extending through said cup-shaped member and having provided at the outer end thereof a radiator, and means included adjacent said anode assembly for providing a fixed magnetic field parallel to said cathode and in the space between the cathode and the anode segments.

8. An electron discharge device having an envelope provided with a restricted portion and closed by a cup-shaped member of conducting material, said cup-shaped member supporting an elongated fiat electrode structure having a free end embracing an anode assembly comprising an apertured portion including a plurality of radially extending fin-like members defining a plurality of cavity resonators the inner ends of which provide anode segments connected by said cavity resonators, a cathode insulatingly supported from said anode assembly, the elongated flat electrode structure extending through said cup-shaped member and having at the outer end thereof an electro-magnetic wave radiator, the elongated flat electrode structure having a passageway extending therethrough for exhausting said envelope, one of said cavity resonators being provided with a slot extending through said anode assembly, said slot opening into the space in the interior of said envelope.

9. An electron discharge device having an envelope provided with a restricted portion and closed by a cup-shaped member of conducting material, said cup-shaped member supporting an elongated fiat electrode structure having a free end embracing an anode assembly comprising an apertured portion including a, plurality of radially extending fln-like members, the inner ends of which provide anode segments connected by cavity resonators, a cathode having cathode leads and insulatingly supported from said anode assembly, terminal members extending through said envelope and spring connections extending between said cathode leads and said terminal members, the elongated fiat electrode structure extending through said cup-shaped member and having at the outer end thereof an electromagnetic wave radiator, and having a passageway extending therethrough for exhausting said envelope, and means included adjacent said anode assembly providing a fixed magnetic field parallel to said cathode and in the space between the cathode and the anode segments, one of said cavity resonators being provided with a slot extending through said anode assembly and opening into the space in the interior of said envelope.

10. An electron discharge device having an elongated envelope closed at one end by a cupshaped member of conductive material, said cupshaped member supporting an electrode structure within said envelope, said electrode structure including a cathode, terminal members extending through said envelope and spring-like conductors having one end connected to said cathode and the other end free and extending between said cathode and the terminal members in said envelope, the free ends of said spring like conductors frictionally engaging said terminal members whereby contact is made between said spring-like conductors and said terminal members when said cup-shaped member is sealed to the end of said envelope.

11. An electron discharge device having an elongated envelope having at one end a restricted portion and an electrode assembly mounted in said restricted portion and comprising a magnetron electrode assembly, said assembly including an anode member provided with a cavity resonator and an electron source associated with said anode member for supplying electrons for energizing the cavity resonator, said envelope having an elongated cone-like portion extending from said restricted portion, said cavity resonator having an aperture opening into said conelike portion of said envelope, said magnetron electrode assembly being supported from a closure member closing the restricted portion of the envelope, the axis of said electrode assembly being transverse to the longitudinal axis of said envelope, said cone-like portion of said envelope having an inner conductive surface.

JOHN M. SPOONER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,223,082 Van Mierlo Nov. 26, 1940 2,372,193 Fisk Mar. 27, 1945 2,300,052 Lindenblad Oct. 27, 1942 2,247,077 Blewett et al June 24, 1941 2,375,223 Hansen et al May 8, 1945 2,153,728 Southworth Apr. 11, 1939 2,283,935 King May 26, 1942 2,263,248 Roberts Nov. 18, 1941 2,128,233 Dallenbach Aug. 30, 1938 2,329,777 Nergaard Sept. 21, 1943 Certificate of Correction Patent No. 2,435,804 February 10, 1948 JOHN M. SPOONER It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows:

Column 4, line 14, after the Word one insert end;

and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Ofiice.

Signed and sealed this 11th day of July, A. D. 1950.

[sun] THOMAS F. MURPHY,

Assistant C'ommz'ssz'oner of Patents.

Disclaimer 2,435,804.J0hn M. Spooner, Manheim Township, Lancaster' County, Pa. CAVI'FY RESONATOR MAGNE'I'RON DEVICE. Patent dated Feb. 10, 1948. D1sclaimer filed Apr. 12, 1950, by the assignee, Radio Corporation of Amenca. Hereby enters this disclaimer to claims 1 and 4 of said patent.

[Oflicial Gazette May 16, 1950.]