Coaxial magnetron raytheon co,us free patents online. Navy to develop an electronically tuned, pulsed coaxial magnetron oscillator. Dti has recently developed compact, solidstate magnetron transmitters that deliver peak powers of 3 kilowatts, 50 kilowatts and 1 megawatt at frequencies ranging from kband to sband. We propose a novel concept of highpower transmitters utilizing the. Coaxial magnetron to perform the coaxial magnetron measurements an asr7 radar transmitter and receiver were obtained. A coaxial air line is operating at 1 mhz the inner radius is ad6mm and the outer radius is bd12 mm assume copper for the conductors. Magnetron mi 29g 29 of the old russian radar bar lock the magnetron is a highpowered vacuum tube, that works as selfexcited microwave oscillator. The distinguishing feature of the coaxial magnetron is the presence of a high q stabilizing cavity between the anode and the output waveguide.
Characteristics of a microwave plasma torch with a coaxial fieldstructure at atmospheric pressure young s. Inner coating of longnarrow tube by plasma sputtering. Inverted coaxial magnetron how is inverted coaxial. The distinguishing feature of a coaxial magnetron design is the presence of a stabilizing cavity between an anode and an output waveguide, which is coupled to the cavity through a coupling slot. The linking slots are parallel to the axis of the magnetron in the rear walls of each other resonator. The purpose of the microwave magnetron is to generate energy for the microwave. Jun 29, 2009 2m167 magnetron with a homebrew coaxial transition.
Pdf optimal design of a coaxial cavity based on qualityfactor. Thats why its highly recommended to hire an appliance. Highpower coaxial magnetron 250kw and 350kw superheterodyne, single or dual down conversion with image reject mixing. Cho pohang university of science and technology, pohang 790784 received 17 february 2005 an atmospheric microwave plasma torch is developed using a dc magnetron at 2.
Magnetron coaxial adaptor having a cap which fits over the magnetron output antenna us5369335a en 199112. Magnetron characteristics a magnetron is a single port device to which the load is connected. Wave various pag j 1 here follows some informations useful to understand the basic concepts about coaxial cables, with the tricks of the trade and curious informations that are rare to find on school books and manufacturers catalogs. Highpower magnetron transmitter as an rf source for the. The dispersion equation of its rf circuit and the coupled resonant interaction equations of electrons with the waveguide mode fields are derived. An electron gun 80 kv 75 a for a 170 ghz coaxial cavity gyrotron has been designed, fabricated and tested. Descriptions of transmitters developed for k, ka, and cbands are shown in the table below.
Continuous wave magnetrons are used for plasma processing in the manufacture of semiconductors and in industrial dielectric heating applications. The magnetron is a vacuum tube which is used in the generation of microwaves of high power. Coaxial magnetrons are used in various types of ground and airborne radar sets. The magnetron is a highpowered vacuum tube that works as a selfexcited microwave oscillator. Keywords coaxial cavity, coaxial magnetron, linear accelerator. Us3412285a coaxial magnetron with rotatable tuning means. Coaxial magnetron gyrotron planar triode highfrequency tetrode diacrode this wide variety of microwave devices has been developed to meet a broad range of applications. The volt meter is reading around 4,000 vdc and the.
Special versions picocoax flexible miniature coaxial cables flexible miniature coaxial cables offering a good compromise between a small diameter e. A coaxial magnetron injection gun cmig for a 2 mw, 170 ghz. Pdf computer simulations of a megawattclass sband coaxial. Inner coating of longnarrow tube by plasma sputtering pdf. The modulator is required to drive a coaxial magnetron with. A numerical simulation of the nonlinear interaction process is carried out. Pdf jan5586 sharp magnetron lg magnetron 5586 magnetron magnetron ns magnetron tube a2160 magnetron coaxial. How to test the magnetron in a microwave oven hunker. Magnetron transmitters diversified technologies, inc. Coaxial cables the use of coaxial cables extends to every application in which a signal must have a minimum distortion and attenuation or where elimination of external interference plays a leading part. The magnetron according to claim 7 wherein said coaxial cavity resonator is operated in the te 011 mode.
Satellite power system sps magnetron tube assessment. Numerical study of cusptron tube with an anticoaxial. Satellite power system sps magnetron tube assessment study. Coaxial magn etron with rotatable tuning means i filed oct. May 10, 2007 an electron gun 80 kv 75 a for a 170 ghz coaxial cavity gyrotron has been designed, fabricated and tested. Simplified model for the dc planar magnetron discharge ugent biblio.
These multicavity devices may be used in radar transmitters as either pulsed or cw oscillators at frequencies ranging from approximately 600 to 95,000 megahertz. Muegge magnetron 915 mhz magnetrons for industrial use. In the proposed design, cavity parameters corresponding to optimum quality factor are determined. The concept of the magnetron was invented in the 30s by dr. The magnetron according to claim 7 wherein said tuning means comprise split ring members housed within a groove defined near the midpoint of the axial length of said outer wall member. Pdf this paper presents the synthesis of a coaxial cavity for. Its working principle is based on the interaction between electron stream and magnetic field. Special care has been devoted to the design of the technical part of the electron gun in order to avoid trapping of electrons, which may result in a limitation of the high voltage performance due to builtup of a penning discharge which may limit the high voltage performance. Microwaves can be really dangerous, the magnetron in this video has less than 110 of the power of a domestic microwave magnetron. The magnetron tube works on dc direct current power. Although you can test the microwave magnetron for bad microwave capacitor symptoms, a microwave oven can give you an electric shock even when its unplugged. Characteristics of a microwave plasma torch with a coaxial. The anode has several cavities that open into interaction space.
Us3412285a us49892165a us3412285a us 3412285 a us3412285 a us 3412285a us 49892165 a us49892165 a us 49892165a us 3412285 a us3412285 a us 3412285a authority us united states prior art keywords anode tuning coaxial magnetron cavity resonator prior art date 19651020 legal status the legal status is an assumption and is not a legal conclusion. Any change in the reactance component of the load changes the frequency of the free running. A cable consisting of a conducting outer metal tube enclosing and insulated from a central conducting core, used primarily for the transmission of high. The l6170 is a high output power coaxial pulsed magnetron that delivers 1700 kw minimum of peak output power at a duty cycle of up to 0. A magnetron has a coaxial resonator about the anode unit and is connected by slots with the resonators of the unit. Highpower magnetron transmitter as an rf source for the electron collider ring of the meic facility. One cavity connected to wave guide through coaxial for output. Transmitters and receivers 115 minutes total part 1 33 minutes part 2 21 minutes part 3 20 minutes part 4 22 minutes part 5 19 minutes viewdownload 84 viewgraphs pdf back to list of lectures. Modifications to the asr7 modulator were necessary since the coaxial magnetron requires that the modulator generate a much slower voltage pulse risetime than the dx276 normally requires.
Industrial magnetrons toshiba hokuto electronics corporation. Sfd342 pdf, sfd342 description, sfd342 datasheets, sfd342. Abstract magnetrons are lowcost highlyefficient microwave sources, but they have several limitations, primarily centered about the phase and frequency stability of their output. The magnetron was pulsed via a spark plug for an application in a homebrew radar system. The great advance in magnetron design was the resonant cavity magnetron or electronresonance magnetron, which works on entirely different principles. Development of a radar pulse modulator eckard friedrich natter university of central florida. Coaxial magnetron in french englishfrench dictionary. Domestic magnetron to coax adaptor comcokid electrical dec 06. Jul 16, 2011 microwaves can be really dangerous, the magnetron in this video has less than 110 of the power of a domestic microwave magnetron. The doubleended coaxial magnetron pulsed plasma dcmpp method with auxiliary outer anode was introduced in order to achieve the uniform coating of nonconductive thin films on the inner walls of insulator tubes. Pdf design of coaxial cavity for high power magnetron.
These multicavity devices may be used in radar transmitters as either pulsed or cw oscillators at frequencies ranging from. Magnetron, coaxial a magnetron with a coaxial resonator around the anode unit and connected by slots with the resonators of the unit. Information and data in this manual are subject to periodic. Pdf the distinguishing feature of a coaxial magnetron design is the presence of a stabilizing cavity between an anode and an output waveguide, which. Instead, especially where a narrow spectrum with high rf power is necessary, magnetrons are the most useful and cheap vts to be employed. Coaxial cavity magnetron article about coaxial cavity. Coaxial pulsed magnetron electron devices the l6170 is a high output power coaxial pulsed magnetron that delivers 1700 kw minimum of peak output power at a duty cycle of up to 0. Cpi 65 kw, kuband coaxial magnetron,alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. Coaxial cable definition of coaxial cable by the free. Patented fiberoptic technology provides noise free, ultrahigh speed data throughput.
A magnetron which achieves mode separation, high efficiency, stability, and ease of mechanical tuning by coupling a coaxial high q cavity to a normal set of quarterwavelength vane cavities. After some investigation, i designed and built the 1kw, cm ovenmagnetron transmitter described here. Pdf format this is an excellent, concise account of how magnetrons developed around the time of world war ii in the united states, the uk, and canada. The connecting slots are parallel to the axis of the magnetron in the rear walls of every other resonator. Brown raytheon company waltham, massachusetts prepared for marshall space flight center under contract nas833157 nlsa national aeronautics and space administration scientific and technical information branch 1981. Magnetron transmitter characteristics range kband kaband cband tube coaxial magnetron risingsun magnetron coaxial magnetron peak power 3 kw 50 kw 1 mw pulse width 300 ns 150 ns 2 s variable rf rise time 2 khz 4 khz 2 khz peak voltage 3. Physics and technology of gyrotrons, gyroamplifiers, free electron lasers, magnetrons, crossfield amplifiers, and relativistic devices employed in plasma fusion reactors, microwave heating, and high power microwave applications. In this study, titanium ti was employed as a cathode sputtering target, and a glass tube was used as a substrate. Index termscoaxial cavity, coaxial magnetron, linear accel. Thus active coaxial magnetron guns are not free as well from incompatible. For example, in linac field magnetrons are the preferred source together with klystrons 57. This report describes the effort on a continuation program supported by the u. Uhftv transmission shipboard and groundbased radar weapons guidance systems electronic countermeasure ecm systems.
Review of the relativistic magnetron by dmitrii andreev, artem kuskov, and edl schamiloglu. Sfd342 datasheet, sfd342 datasheets, sfd342 pdf, sfd342 circuit. Pdf on apr 1, 2017, mohit kumar joshi and others published design of. The l0325x is a medium output power coaxial pulsed magnetron that delivers 325 kw minimum of peak output power at a duty cycle of up to 0. Acronym definition ice immigration and customs enforcement us department of homeland security. Active coaxial and active inverted coaxial magnetron. The magnetron operates as an oscillator, which is a device that generates oscillatory electric currents or voltages by nonmechanical means. This requires a nominal rfoutput pulse of lokw and. The magnetron is designed for use with a separate magnet which must conform with the. It has been accepted for inclusion in retrospective theses and dissertations by an authorized administrator of stars. In an argon ar and oxygen o2 gas mixture, magnetron plasma. Coaxial magnetron article about coaxial magnetron by the.
In our laboratory, plasma reactors have been developed by using magnetron hollow cathode discharges w8x, coaxial magnetron pulsed discharges zcmpp. Kaband, kband, and cband magnetron radar modulator characteristics parameter kaband kband cband tube risingsun magnetron coaxial magnetron. First magnetron tube was invented in 1940 at englands university by john randall and harry boot. Gerard united states patent 3,412,285 coaxial magnetron with rotatable tuning means william a. Crossed electron and magnetic fields are used in the magnetron to produce the highpower output required in radar equipment. It is a coaxial line output type and is forced air cooled. This paper presents the synthesis of a coaxial cavity for highpower xband coaxial magnetron. The space between cathode and anode is called interaction space. A new kind of mmwave cusptron tube with anticoaxialmagnetrontype wall structure is proposed. Coaxial magnetron market is categorized based on product type, applications, and geography. A coaxial magnetron has an external cavity attached to the anode of the conventional magnetron, which stores energy and hence, enhances the qualityfactor q of the device 4, 5. According to edison tech center, the cavity magnetron is the central part of a microwave. The overall assembly mounts inside an onmount rf package and is fully air insulated for light weight and ease of maintenance.