16 results about "Microwave oscillators" patented technology

The invention relates to the technical field of microwave photonics, and discloses a full-band noise microwave source system and a microwave signal generation method. An optical reference unit is used for generating an optical reference signal; the photoelectric phase detection unit is connected with the optical reference unit and is used for receiving the optical reference signal and a feedback signal sent by the microwave oscillation unit and outputting a beat frequency electric signal for reflecting a phase error; the servo control unit is connected with the photoelectric phase detection unit and the microwave oscillation unit and is used for separating the beat frequency electric signal into a low-frequency control signal and a high-frequency control signal; the microwave oscillation unit is connected with the servo control unit and outputs a target microwave signal in response to the low-frequency control signal and the high-frequency control signal. A beat frequency electric signal is separated into a low-frequency path and a high-frequency path by using the servo control unit, so that targeted suppression of phase noise of different frequency bands in a single signal source is realized.

This green tire warming device for retreading for warming a green tire for retreading before vulcanization comprises: a warming chamber body 2 configured to partition a warming chamber 21; a microwave oscillation unit 3 provided on an inner wall surface of the warming chamber body and configured to irradiate the inside of the warming chamber with microwaves; a pair of shielding plates 4 configured to shield the microwaves; and a rotating tool 5 configured to rotate the green tire for retreading placed in the heating chamber in the tire circumferential direction relative to the warming chamber body. While the green tire for retreading, in which a pair of side portions of the green tire for retreading are covered from both outer sides in the tire width direction by the pair of shielding plates, is rotated in the tire circumferential direction relative to the warming chamber body by the rotating tool, a green tread rubber of the green tire for retreading that is not covered by the pair of shielding plates is warmed by microwaves radiated from the microwave oscillation unit.

The invention relates to the technical field of forward wave oscillators, in particular to a K-band TE11 mode microwave oscillator. Comprising a cylindrical waveguide, and sequentially comprises a cut-off transition section, an interaction section and an output transition section, the cathode structure is mounted in the cut-off transition section; the anode waveguide structure comprises a plurality of slotted circular ring metamaterial units which are arranged in the interaction section at intervals in the axial direction, are linked through a metal cylinder to form a serial structure and are connected to the wall of the cylindrical waveguide to form a double-spiral anode slow wave structure; electron beams generated by the cathode structure rotate in the axial direction under the action of an external electromagnetic field, interact with each other in the anode slow wave structure to excite forward waves in a TE11 mode, and radiate outwards along an output transition section; the collector is arranged in the output transition section. On the basis of realizing a Gaussian beam TE11 mode, a traditional mode conversion structure is omitted, the structure is more compact, and light weight and miniaturization are easy to realize.

To provide a magnon junction, a magnon random access memory, a microwave oscillator, a detector, and an electronic apparatus.SOLUTION: A magnon junction includes: a first electrode layer formed of a nonmagnetic conductive material; a free magnetic layer provided on the first electrode layer and formed of a ferromagnetic conductive material; an antiferromagnetic barrier layer provided on the free magnetic layer and formed of an antiferromagnetic insulating material; a reference magnetic layer provided on the antiferromagnetic barrier layer and formed of the ferromagnetic conductive material; and a second electrode layer provided on the reference magnetic layer and formed of the nonmagnetic conductive material. The reference magnetic layer has perpendicular magnetic anisotropy or a perpendicular magnetic moment component, and a magnetic moment direction thereof is fixed along a perpendicular direction. The free magnetic layer has the perpendicular magnetic anisotropy or a perpendicular magnetic moment component, and a magnetic moment direction thereof is reversible along a perpendicular direction. The antiferromagnetic barrier layer has the perpendicular magnetic anisotropy or the perpendicular magnetic moment.SELECTED DRAWING: Figure 3

This invention discloses an adjustable frequency microwave oscillator, comprising a feedback resonant network, an active transistor amplifier, and a phase adjustment network. The feedback resonant network includes a resonator. The active transistor amplifier is connected to the feedback resonant network through an input matching network and an output matching network. The phase adjustment network is equivalent to a variable capacitor. The signal passes through the input matching network, the active transistor amplifier, the output matching network, and the feedback resonant network to form a positive feedback oscillation. The phase of the loop is adjusted by regulating the equivalent variable capacitor of the phase adjustment network. The oscillation frequency is adjusted by the phase adjustment network, and the oscillation conditions of the oscillator are improved by a high-Q frequency selection network, enabling precise control of the frequency and power of the microwave oscillator.

A head assembly includes an upper cover assembly disposed above a plasma reaction zone, the upper cover assembly including a top plate and a bottom plate defining a region for containing a cooling fluid therebetween, the bottom plate including one or more openings, one or more plasma modules coupled to the plasma reaction zone through the openings, each of the plasma modules including a microwave source generating a microwave oscillation, a waveguide assembly, and a resonant cavity, the microwave oscillation reacting with a reactant gas, and one or more guide line assemblies configured to direct an effluent from a semiconductor process to the plasma reaction zone.

This invention relates to a dual-band non-frequency-doubled high-power microwave oscillator with a coaxial drift cavity, comprising a cathode holder, a ring cathode, an anode outer cylinder, a first drift cavity, a first slow-wave structure, a second drift cavity, a second slow-wave structure, an output waveguide, an inner conductor, and an external guiding magnetic field. The entire structure is rotationally symmetrical about its central axis, and the components are arranged coaxially along the electron beam transmission direction, forming a complete electron beam transmission and microwave generation path. This invention uses a coaxial drift cavity to isolate the two slow-wave structures, achieving a reflection coefficient greater than 0.99 for the microwaves generated by the two slow-wave structures, exhibiting high reflection characteristics. This effectively isolates the two slow-wave structures from each other, avoiding beam-wave interaction interference. This overcomes the limitation of previous devices where the output frequency of dual-frequency microwaves was approximately a harmonic relationship, allowing for more flexible selection of the operating frequency.

The invention relates to a V-band high-power microwave oscillator based on distributed extraction, a solenoid magnetic field is electrified to generate a magnetic field, under the guidance of the magnetic field, an electron beam is transmitted into a drift tube, and is transmitted to two sections of V-band slow wave structure areas of an internal coaxial electromagnetic structure along the axial direction; in the area of the first section of slow wave structure, the beam and the wave are synchronized to enable the beam to generate speed modulation, the speed modulation obtained by the beam in the first section of slow wave structure is converted into density modulation in the drift cavity through drift motion, finally, the electron beam and the coaxial slow wave structure generate beam-wave action in the second section of slow wave structure, energy is given to a microwave field, and therefore HPM is generated. The second coaxial microwave output waveguide is communicated and coupled with the seventh slow-wave structure period and the twelfth slow-wave structure period of the second section of slow-wave structure, so that a part of energy given to microwaves by electron beams is output from the second coaxial microwave output waveguide, and the distributed extraction effect is achieved; and the power capacity of the device is effectively improved.

The invention relates to the technical field of cigarette appliances, and provides a cigarette heating appliance for microwave detection of tobacco shred moisture and a control method.The cigarette heating appliance comprises a shell, a switch device arranged on the shell, a heating body arranged in the shell and allowing a cigarette to be inserted therein, a PCB control circuit board arranged in the shell and a probe support arranged in the shell; a system controller, a microwave oscillator and a microwave receiver are arranged on the PCB control circuit board, a microwave emitter and a microwave receiving probe are arranged on the probe support and symmetrically arranged on the two sides of the heating body, the microwave oscillator is connected with the microwave emitter through a microwave conduction wire, and the microwave receiver is connected with the microwave emitter through a microwave conduction wire. And the microwave receiver is connected with the microwave receiving probe through a microwave conducting wire. The moisture content of the tobacco shreds is detected in a non-contact mode through microwaves, the power of the heating body is controlled according to the moisture content of the tobacco shreds, and the fragrance of smoke is better; meanwhile, when the change of the moisture content of the cigarette is large and the cigarette is not suitable for smoking, the smoking set cannot be heated and prompts the user, and the influence on the customer experience is avoided.

The invention discloses a broadband microwave excitation source capable of fast frequency modulation, and relates to the field of microwave excitation sources. Comprising an integrated microwave oscillation module, a double-loop phase-locked loop module, an adaptive frequency pre-calibration module, a power and frequency linkage adjustment unit, a high-speed digital control unit, a power amplification module, a power management module and an electromagnetic interference adaptive module. According to the invention, 1GHz-40GHz wide frequency coverage and rapid frequency modulation switching of less than or equal to 60ns are realized through the double-loop phase-locked loop module, the scene pre-judgment and parameter pre-loading functions are matched to adapt to the requirements of multiple application scenes, and by means of reverse counteracting and shielding optimization of the electromagnetic interference self-adaptive module and double-factor compensation of the self-adaptive frequency pre-calibration module, the frequency modulation switching efficiency is improved. The frequency deviation caused by interference is controlled to be smaller than or equal to 0.3 kHz, the deviation correction precision before frequency modulation is kept to be smaller than or equal to 0.5 kHz, the frequency deviation is further reduced to be smaller than or equal to 0.2 kHz after multi-module cooperative calibration, and the advantages of being wide in frequency band, fast in frequency modulation, high in precision, high in stability and high in reliability are achieved.

The invention relates to a microwave oscillator and a preparation method and a driving method thereof. The microwave oscillator comprises a substrate, a heavy metal layer, a free layer, an insulating layer, a fixed layer and a first electrode, the heavy metal layer is located on the substrate, and the free layer is located on the side, away from the substrate, of the heavy metal layer. The barrier structure of the free layer comprises an edge part, an annular concave part and a middle convex part. The potential barrier height of the edge part and the potential barrier height of the middle protruding part are larger than the potential barrier height of the annular concave part. The free layer comprises a magnetic Hopv quantum, and the magnetic Hopv quantum is located in the annular recessed part. The insulating layer is located on one side of the free layer away from the substrate, the fixed layer is located on one side of the insulating layer away from the substrate, and the first electrode is located on one side of the fixed layer away from the substrate. According to the technical scheme, the robustness and reliability of the microwave oscillator in a complex working environment can be remarkably enhanced, and the microwave oscillator can output a high-frequency microwave signal.

The application discloses a kind of microwave reflection quadrature mixing based grain moisture content detection device and its detection method, belong to microwave application technical field, including measured sample, sample container, front panel, device shell and microwave oscillator located in the inside of device shell, power divider, quadrature mixer, circulator, transceiver multiplexing antenna, sliding bracket, guide rail unit and control unit;The application adopts quadrature mixing technology, designs corresponding transceiver multiplexing antenna, realizes the continuous measurement of space standing wave signal by the movement of transceiver multiplexing antenna, and the reflected signal after the action of microwave transmitting signal and sample is quadrature mixed by quadrature mixer, and the function relationship formula is established to retrieve grain moisture content by processing and analyzing signal through control unit, to realize grain moisture content real-time measurement.The application improves the portability and measurement accuracy of microwave moisture content detection device, so that the measurement result is not affected by material thickness and bulk density, and rapid, non-destructive, high-precision detection of granular grain moisture content can be realized.

The application belongs to the technical field of microwave photon and optical communication, and specifically relates to a full-optical microwave oscillator under single-mode optical fiber twist radial mode vernier effect, which comprises a self-excited erbium-doped fiber amplifier, a tunable optical filter, an isolator, a first polarization controller, a second polarization controller, a third polarization controller, a first single-mode optical fiber, a second single-mode optical fiber, a polarizer, a first optical coupler, a second optical coupler, a third optical coupler, a spectrometer, a photoelectric detector and a spectrum analyzer. The application realizes passive mode-locking based on twist radial mode by using nonlinear polarization rotation (NPR) technology, narrows the linewidth to the order of hertz by using a passive intrinsic resonant cavity, effectively suppresses the side mode based on double-ring vernier effect, breaks the limitation that a conventional twist radial mode full-optical microwave oscillator signal cannot generate high-performance twist radial mode full-optical microwave oscillator signal, has unique and innovative advantages, and finally realizes twist radial mode single-longitudinal-mode oscillator signal output with high side mode suppression ratio.

This invention relates to a V-band high-power microwave oscillator based on distributed extraction. A magnetic field is generated by energizing a solenoid magnetic field. Under the guidance of this magnetic field, an electron beam is transmitted to a drift tube and propagates axially into two V-band slow-wave structure regions within an internal coaxial electromagnetic structure. In the first slow-wave structure region, beam-wave synchronization induces velocity modulation in the beam. This velocity modulation is converted into density modulation within the drift cavity through drift motion. Finally, in the second slow-wave structure, the electron beam and the coaxial slow-wave structure undergo beam-wave interaction, transferring energy to the microwave field, thereby generating HPM (High-Power Microwave Oscillator). The second coaxial microwave output waveguide is coupled to the seventh and twelfth slow-wave structure periods of the second slow-wave structure, allowing a portion of the energy transferred from the electron beam to the microwaves to be output from the second coaxial microwave output waveguide, achieving a distributed extraction effect. For non-distributed extraction structures, this effectively improves the device's power capacity.

A method and a system for generating single-sideband Raman light for cold atom interferometer through phase modulation are provided. The system includes a laser, an electro-optic modulator (EOM), a local microwave oscillator, a narrow-bandwidth optical-fiber filter, an optical-fiber power amplifier and a frequency doubling crystal. The laser has frequency of ω and is input to the EOM. The local microwave oscillator applies a modulation voltage with frequency of δ to the EOM and generate double-sideband frequency-modulated light with frequencies of ω±nδ(n=0,1,2, . . . ). This light is filtered by the narrow-bandwidth optical-fiber filter, which outputs the target frequency light and is successively input to the optical-fiber power amplifier and the frequency doubling crystal and yields the single-sideband Raman light for cold atom interferometer. The Raman light generation system has simple structure, low-cost, high integration level, easy implementation, high maturity and good stability, and has practical significance in realizing an engineering-based laser system for high-precision atom interferometer measurement.

There is provided a technique, which includes: a process chamber where a substrate is processed; a microwave oscillator configured to supply microwaves to the process chamber; and a controller configured to be capable of controlling the microwave oscillator to perform: a heating process where the substrate is heated with a first microwave, among the supplied microwaves, supplied at a first microwave power so that a process of supplying the first microwave during a supply time and a process of stopping the supply of the first microwave during a stop time shorter than the supply time are performed a predetermined number of times or for a first predetermined time; and a modifying process in which the substrate is supplied with a second microwave, among the supplied microwaves, at a second microwave power higher than the first microwave power for a second predetermined time while maintaining the second microwave power.