104 results about "Travelling wave tube amplifier" patented technology

An approach is provided estimating non-linear characteristics of an amplifier (such as a Travelling Wave Tube Amplifier) used to amplify a composite signal in a radio communication system. The composite signal, which includes a plurality of inbound signals overlay on an outbound signal, is sampled. The outbound signal is utilized as a training signal. Coarse estimates of the response of the amplifier is generated based on the samples of the composite signal and the training signal. Further, the interference associated with the inbound signals are removed from the estimation of the response of the amplifier by curve-fitting and estimating interference characteristics of the composite signal. An estimated response of the amplifier is thus output, and can be utilized to provide accurate non-linearity compensation and cancellation.

The invention relates to a full-coverage multi-channel multi-frequency band measuring and control system of a deep space electric propulsion asteroid spacecraft, comprising a star service computer and a plurality of deep space responders and an ultra high frequency (UHF) relay transceiver which are connected with the star service computer; the deep space responders are further connected with multiplexers and high-stability crystal oscillators, and the multiplexers are connected with all-directional receiving antennas and large-diameter directional antennas; the deep space responders are also connected to the input ends of low-power solid-state amplifiers and high-power traveling wave tube amplifiers through switch arrays, and the output ends of the low-power solid-state amplifiers and the high-power traveling wave tube amplifiers are connected to all-directional transmitting antennas and low-gain transmitting antennas through the switch arrays; and the UHF relay transceiver is connected with a relay transceiving antenna. According to the invention, the full-coverage multi-channel multi-frequency band measuring and control system of the deep space electric propulsion asteroid spacecraft can meet all-process star-earth remote control, remote detection, range finding and other requirements of the deep space asteroid spacecraft as well as the relay communication requirements of the asteroid spacecraft simultaneously, and has the advantages of high reliability, resource saving and low cost.

The invention relates to a general thick film type floating plate modulator, which comprises a control component FPGA, a high-speed logic optocoupler, a driving circuit, an impulse isolation transformer, a thick film high-pressure switching circuit and a suspension power supply, wherein the FPGA uses VHDL language to modulate ultra-wide impulse into opening impulse train and truncation impulse; an isolation strip wave duct amplifier of the high-speed logic optocoupler is used for striking a light to protect the FPGA; the driving circuit adopts a high-speed driver to amplify the opening impulse train and the truncation impulse; the impulse isolation transformer comprises a primary electrode and a dual-secondary electrode; the thick film high-pressure switching circuit is composed of an opening tube and a truncation tube auxiliary circuit; the opening impulse train and the truncation impulse are transmitted to the thick film high-pressure switching circuit through the impulse isolation transformer; and the on/off of the opening tube and the truncation tube are switched to realize compatibility of the ultra-wide impulse and a narrow impulse. The invention adopts software language to realize opening/parameters adjustment of the truncation impulse and uses reference level of a low-pressure high-efficiency inverter to adjust positive bias so as to realize generality and interchangeability.

A method and system provide the ability to measure a transmission performance characteristic. A signal is received and demodulated. An ideal signal is generated from the demodulated signal. The received signal is coherently averaged to reduce noise. The performance characteristic is the estimated TWTA nonlinearity from a difference between the coherently averaged ideal signal and received signal.

The invention discloses a pre-bunching high-power gyro traveling wave tube amplifier and relates to a microwave source device technology, comprising three sections: a linear amplifying section which adopts loss loading metal waveguide; an inertial drifting section which adopts heavy loss loading over-mode waveguide to provide an inertial bunching space approximating zero field for a bunching electron beam; and a nonlinear amplifying section which adopts smooth metal waveguide, wherein the gyro electron beam is fully modulated by driving power in the linear section; the modulated electron beam obtains good bunching characteristic according to inertia in the inertial drifting section; and the electron beam with good bunching vehemently reacts with an operating mode in the nonlinear amplifying section and transforms transverse kinetic energy to microwave energy to obtain high-energy microwave output. Both the linear amplifying section and the inertial drifting section are loss loops to guarantee the stability of the device; and the nonlinear amplifying section adopts the pre-bunching electron beam to work, and has the advantages of high power, high stability, and high efficiency.

A power control system for a satellite receiving radio-frequency signals includes a digital processor and a traveling wave tube amplifier system and corresponding traveling wave tube. An anode voltage of the traveling wave tube amplifier system is used to modulate or saturate the current of the electron beam of the traveling wave tube so that the output power of the traveling wave tube amplifier system, from the saturated electron beam, is proportional to a waveform envelope of the radio-frequency signals. The digital processor controls anode and RF input signal amplitudes to the traveling wave tube and predicts necessary corrections.

The invention provides a rectangular-grooved loading winding waveguide slow wave line, relating to a travelling wave tube amplifying device in the technical field of microwave vacuum electronics. A series of arc (or right-angle) bend waveguides and straight waveguides are connected end to end to form a winding waveguide structure; each bend waveguide is inboard provided with an opening along the broadside direction of the waveguides; each opening position is connected with a rectangular groove; the whole winding waveguides and the chambers of the rectangular-grooves are mutually communicated; the central axis symmetric line of the winding waveguide structure, the straight waveguides walls and the rectangular-grooved walls are provided with circular through holes at the points of intersection thereof; then two through holes of all adjacent straight waveguide walls and rectangular-grooved walls are connected by metal tubes with the same aperture size as the aperture size of the circular through holes to form an electron bunch channel. In the invention, the rectangular grooves featuring periodic loading are used for improving field distribution in conventional winding waveguide slow wave line; the slow wave line of the invention, compared with ordinary slow wave line, has higher coupling impedance, higher power gain and output power and smaller volume.

The invention discloses a planar annular microstrip slow-wave structure which belongs to the field of microwave electric vacuum technology. The planar annular microstrip slow-wave structure relates to a traveling-wave tube amplifier device. The planar annular microstrip slow-wave structure comprises a dielectric substrate (2) and metal wires (1) on the surface of the dielectric substrate (2). The planar annular microstrip slow-wave structure is characterized in that each metal wire (1) has a periodical structure which is obtained through successively connecting a plurality of annular units with same shape and same dimension. Each annular unit is obtained through joining two open rings which are in mirror symmetry in a vertical direction. Two adjacent annular units are connected at a joining part between the two open rings through a microstrip line. Compared with an existing microstrip slow-wave structure, the planar annular microstrip is advantageous in that a vacuum device with the planar annular microstrip slow-wave structure can be used in a higher operating frequency band on condition of same dimension because of wider cold bandwidth. The planar annular microstrip slow-wave structure provided by the invention has a wide transverse dimension, thereby effectively reducing a requirement for an electronic gun and a focusing magnetic field. The planar annular microstrip slow-wave structure has a relatively high coupling impedance and can perform interaction with an electron beam in a relatively good manner. Therefore the planar annular microstrip slow-wave structure has relatively high potential and is suitable for miniature planar traveling-wave tubes.

The present invention relates to a coupling input structure and a design method for a gyro traveling-wave tube amplifier (gyro-TWTA). Wherein, the structure comprises a vacuum isolating window, a first wave-guide and a matched wave-guide, all of which are connected together with flanges. The method includes that based on resonance characteristic of the vacuum isolating window, the coupling input structure is matched on two frequency points according to range of a working band. The vacuum isolating widow is adjusted to make a resonance frequency land into the working band, thus setting the resonance frequency as a first reference frequency. A former level of combined wave-guide is created and composed of the first wave-guide and the matched wave-guide cascaded in the first reference frequency. And then, the former level of combined wave-guide is matched and cascaded with the vacuum isolating window, thus obtaining a working bandwidth of the gyro-TWTA coupling input structure. Two points of minimum standing wave ratio are provided in the working band. As the working frequency is approximate to a cut-off frequency of a main mutual loop for the gyro-TWTA, excellent transmission performance is provided. The compact structure can be directly made with current techniques.

A method and system provide the ability to measure transmission performance characteristics. A signal is received and demodulated (1302). An ideal signal (1320) is generated (1304) from the demodulated signal. The received signal is coherently averaged (1324/1326) to reduce noise. The performance characteristic is the TWTA nonlinearity estimated from the difference between the coherently averaged ideal signal and the received signal.

The invention relates to a slow wave structure of a terahertz micro-electrical vacuum folding waveguide traveling-wave tube amplifier. The slow wave structure comprises n sections of folding waveguide slow wave structures connected in sequence, wherein n is a positive integer and n is greater than or equal to 2; the first section of folding waveguide slow wave structure and the (i+1)-th section of folding waveguide slow wave structure meet that gi is smaller than g(i+1), v(i+1)/vi is equal to gi/g(i+1), gi is a folding degree of the i-th section of folding waveguide slow wave structure, vi is an electron velocity at the electron beam input port of the i-th section of folding waveguide slow wave structure, and i belongs to the range of 1 to n-1. According to the slow wave structure of the terahertz folding waveguide traveling-wave tube amplifier provided by the invention, the multi-section type folding waveguide slow wave structure is adopted, so that the power and efficiency of the terahertz micro-electrical vacuum folding waveguide traveling-wave tube amplifier are improved.

The invention discloses a slow wave structure of a coplanar waveguide, wherein the slow wave structure of the coplanar waveguide belongs to the technical field of microwave electrovacuum and relates to a travelling wave tube amplifier device. The slow wave structure of the coplanar waveguide comprises a dielectric substrate (2) and a metal layer (1) on the surface of the dielectric substrate (2). The metal layer (1) comprises a central conduction band and grounded metal surfaces at two sides of the central conduction band. The shape of the central conduction band is a periodical bent curve. The central conduction band is isolated from the grounded metal surfaces at two sides. The slow wave structure of the coplanar waveguide can effectively settle a problem of electron accumulation on a microstrip slow wave structure, and serial connection or parallel connection with other microwave devices is easily realized, thereby easily realizing small size and integration of a vacuum device. The vacuum device with the structure of the invention has relatively low working voltage, and the coupling impedance curve and the dispersion curve are relatively flat, thereby realizing wide frequency band of the vacuum device and reducing gain fluctuation of the vacuum device in the working frequency band. Therefore the slow wave structure of the coplanar waveguide has relatively high potential and is suitable for a miniature planar travelling wave tube.

The invention discloses a traveling wave tube linearizer, which comprises a first hybrid junction, a second hybrid junction, a linear branch and a nonlinear branch. A radio frequency input signal is divided into two paths by the first hybrid junction, and the two paths are recorded as a first branch of signals and a second branch of signals. The first and second branches of signals are input into the linear branch and the nonlinear branch respectively. Output signals of the linear branch and the nonlinear branch are coupled into a radio frequency output signal by the second hybrid junction. The traveling wave tube linearizer has a simple structure; and the curve of the linearizer can be regulated by regulating amplitude expansion, phase expansion and the waveform of a nonlinear generator, and then the linearizer is matched with the characteristics of different traveling wave tube power amplifiers to linearize the different traveling wave tube power amplifiers, so that the problems of nonlinear differences among different traveling wave tubes are solved.

The invention discloses a multi-stage gyro-traveling-wave tube amplifier which works with different modes on waves with the same frequency. The multi-stage gyro-traveling-wave tube amplifier is characterized in that the amplifier is composed of an electron stream passage(1), an input segment(2), a cut-off segment(3), an output segment(4), an output varying waveguide(5), and an output even waveguide(6). The electron stream passage(1) is connected with the input segment(2) which is in connection with the cut-off segment(3); the cut-off segment(3) is connected with the output segment(4) which is connected with the output varying waveguide(5), and the output varying waveguide(5) is connected with the output even waveguide(6). The input segment and the output segment work at the same harmonic wave and the same frequency; the angular indexes of the work modes of the waveguides of the input segment and the output segment are the same; the input segment works on low level waveguide mode and the output segment works on waveguide mode higher than that of the input segment.

A traveling wave tube (TWT) amplifier includes a beam forming electrode (BFE) and a BFE modulator having a bias-based keyer so that the TWT amplifier signals are keyed off during periods when RF power is not to be amplified. Biasing the beam forming electrode voltage off relative to cathode voltage effectively shuts down the electron beam without shutting down the power supply minimizes power supply stress and significantly improves reliability, so that low-level RF signal input is not amplified, and no significant RF power is output. Likewise, given that no amplification has taken place, no power associated with the TWT amplification function is consumed. Thus, the only power consumed by the TWT amplifier is that associated with the cathode heater and the electronic power conditioner (EPC) used as the electron beam source.

The utility model has discloses a coupling output structure for traveling wave tube amplifiers, which comprises an input port and an output port; wherein, the radius of the output port is bigger than that of the input port, a first grade gradually variable circle waveguide and an Nth rank gradually variable circle waveguide are cascaded between the input port and the output port. The utility model adopts the double-segment correcting Duelfer-Chebyshev gradually variable circle waveguide cascade connection or a transition circle waveguide cascaded in the central section of the double-segment correcting duelfer-chebyshev gradually variable circle waveguide. The utility model has the advantages of resolving the problems in prior art , such as large size, high reflection coefficient of the input port and weak capacity of parasitic mode restraint; when the coupling output structure is applied to traveling wave tube amplifiers, positive effects can be obtained, , which are of great practical significance for developing the high power microwave sources applied in long ranged radars and electronic warfare technology.

The invention discloses a twisted waveguide separating type directing plane ridge waveguide folded waveguide. The twisted waveguide separating type directing plane ridge waveguide folded waveguide comprises at least two shortest waveguide period structures which are sequentially communicated in the Z-axis direction and an input and output waveguide; the twisted waveguide separating type directing plane ridge waveguide folded waveguide is composed of a plurality of U-shaped bent waveguides, twisted waveguides and straight waveguides. When the twisted waveguide separating type directing plane ridge waveguide folded waveguide is applied to a traveling-wave tube contour line electromagnetic wave vacuum device, compared with a traditional folded waveguide, the twisted waveguide separating type directing plane ridge waveguide folded waveguide has the advantages that the 180-degree phase difference brought by the U-shaped bent waveguides existing when an electron beam passes through a traditional slow-wave structure is overcome, and the working bandwidth of an electromagnetic wave source can be better widened. Through the directing plane structure, all electromagnetic wave structures can be arranged on a base, and work is completed at a time through a common numerical control milling machine, so that the machining precision is guaranteed, and the machining cost is reduced. The twisted waveguide separating type directing plane ridge waveguide folded waveguide can achieve compact delay lines of various waveguides or single-ridge waveguides or double-ridge waveguides, and especially the slow-wave structure of a compact traveling-wave tube amplifier and the like.

The invention relates to the technical field of microwave electronic devices, in particular to a coupling output segment of a gyrotron traveling wave tube amplifier. The coupling output segment is connected with a high-frequency interaction segment and comprises a first output segment body and a second output segment body, wherein the first output segment body and the second output segment body both satisfy the requirements of a Chebyshev tapered waveguide structure, the first output segment is connected with the second output segment, and the radius of the tail end of the first output segment is equal to the initial radius of the second output segment. According to the coupling output segment of the gyrotron traveling wave tube amplifier, the reflection of a working mode TE01 and mode coupling from the working mode TE01 to a higher-order mode TE02 can be effectively suppressed, and the transmission performance of the gyrotron traveling wave tube amplifier is improved.

The invention provides a digital-analog combined gain temperature compensating circuit for a travelling-wave tube amplifier. The circuit comprises a temperature-measuring circuit, an analog temperature compensating circuit, and a digital temperature compensating circuit, digital-analog combined gain temperature compensation for the travelling-wave tube amplifier can be realized, wherein the analog temperature compensating circuit can realize coarse temperature compensation via the adjustment of an adjustable resistor, the digital temperature compensating circuit obtains a digital temperature compensating voltage corresponding to an output voltage of the temperature-measuring circuit via a set look up table (LUT) so that fine tuning of temperature compensation is realized, the defects that by individually employing analog temperature compensation or digital compensation, the debugging quantity is large, self excitation easily occurs within a temperature range, the margin of temperature compensation is not sufficient, and the compensation match is poor are overcome, the realization mode of the circuit is simple, the requirements of miniaturization and low power consumption of space-borne products can be met, the compensation precision is high, and the margin is wide.

A power management system, notably for a dual travelling wave tube amplifier, includes: two travelling wave tubes, each comprising one Anode Zero electrode, and an electronic power conditioner, the power management system being implemented in said electronic power conditioner and including power management means associated with each travelling wave tube, configured for setting the Anode Zero electrode voltage to a determined minimum value when a sleep mode is activated, the power management means maintaining the travelling wave tube operating power at a value below its nominal working range. A sleep mode can advantageously be combined with an RF-Mute mode.

The invention discloses a high-power travelling wave tube amplifier for broadband, which comprises a field effect amplifier, a numerical control attenuator, a travelling wave tube, a power supply of the travelling wave tube and a control center, wherein the control center is provided with a plurality of travelling wave tube parameters Ug and Uh. The following experiments are carried out aiming at each frequency point: each group of travelling wave tube parameters is arranged in the travelling wave tube sequentially through the power supply of the travelling wave tube; when the travelling wave tube works in each group of the travelling wave tube parameters, the control center adjusts the attenuation times G3 of the numerical control attenuator, collects the output power of the travelling wave tube and changes according to whether the output power changes along with the attenuation times G3 or not so as to obtain the dynamic range of the travelling wave tube. The parameters of the travelling wave tube and the attenuation times are selected when the maximum dynamic range appears and form a relation list aiming at each frequency point. In the course of actual amplification work, the corresponding Ug, Uh and G3 are searched in the relation list according to the frequency of an input signal so that the linear amplification of the integral amplifier in a larger range can be realized.