67 results about "Impedance Converter" patented technology

The invention belongs to the technical field of communication, and particularly relates to an ultra-wideband miniaturized Vivaldi antenna. The antenna comprises a dielectric substrate, wherein the upper surface of the dielectric substrate comprises a main body Vivaldi antenna, four resistors, two rectangular metal patches and an artificial surface plasma, wherein the main body Vivaldi antenna is provided with an exponential gradually-changed slot; a feed network is arranged on the lower surface and comprises six impedance conversion microstrip transmission lines, a fan-shaped transmission line and a circular groove; the main body antenna and the dielectric substrate are placed in a centered alignment manner, the four resistors are placed at the tail end of the main body antenna, and the rear sides of the resistors are connected with the two rectangular patches; the artificial surface plasma is placed in the main body antenna gradual change gap; and the multi-section impedance transformer and the microstrip-to-slot line structure of the feed network are aligned with the circular slot of the main body antenna. According to the invention, the ultra wide band, miniaturization and high radiation gain are realized by designing the main body antenna, slotting the edge, loading the resistor, carrying out the artificial surface plasma and the like. The working frequency band of the antenna ranges from 0.2 GHz to 18 GHz, and the antenna has the characteristic of miniaturization.

The invention provides a hydro-generator shaft insulation multi-parameter monitoring method and system, and the method comprises the steps: employing a common excitation proportion method, introducing a high-frequency excitation current source through a grounding brush, loading a high-frequency voltage on the basis of a shaft voltage, respectively detecting an oil film voltage and an insulation pad voltage, and calculating a voltage amplitude ratio, analyzing oil film capacitance and insulation capacitance based on the high-frequency signal; a co-excitation polling method is adopted, high-frequency excitation current paths are sequentially switched through a polling device, high-frequency current flows through different impedance branches, high-frequency and low-frequency voltage signals are separated through a frequency-selecting filter, and oil film impedance and insulation impedance are analyzed; an independent excitation method is adopted, a high-frequency excitation source is independently introduced from a bearing bush, a frequency-selecting filter or an impedance converter is combined, independent measurement of oil film impedance and insulation impedance is achieved, and oil film thickness and insulation parameters are calculated. According to the invention, multi-parameter monitoring of bearing insulation can be realized.

The invention belongs to the technical field of microwave antennas, and particularly provides a tight coupling phased-array antenna based on an application frequency-variable impedance matching layer, so as to solve the challenges of the existing phased-array antenna in the aspects of dynamic adjustability and environmental adaptability. The three-order Chebyshev impedance converter comprises a reconfigurable surface loaded with a diode, a bow-tie type dipole, a double-Y balun, a three-order Chebyshev impedance converter, a coaxial feed port, a metal floor, a dielectric layer, a grounding metal sheet and a metal chip resistor. The three-order Chebyshev impedance transformer, the chip resistor and the double-Y balun are cascaded to carry out broadband balanced feed on the dipole, and the dielectric constant and the magnetic conductivity of the dielectric substrate are changed through the on-off of the diode, so that the impedance matching and radiation characteristics of the phased-array antenna are improved. According to the invention, dynamic requirements of modern communication and radar systems on antenna performance can be met.

An image sensor (1) includes: a pixel array (40) in which pixels (30) are arranged in a matrix; impedance converter circuits (61) for each column, each of which receives a pixel signal from at least one pixel (30); and an AD converter (64) for each column that converts from analog to digital signals output from the impedance converter circuits (61). The pixel array (40) includes, for each column, N pixel groups (100) each including K or more pixels (30) consecutively arranged in a column direction. Each of the N pixel groups (100) includes a vertical signal line (50) connected to L or more pixels (30) among the K or more pixels. In each column, each of the N vertical signal lines (50) of the N pixel groups (100) is connected to the input of one of the impedance converter circuits (61), and the output of each of the impedance converter circuits (61) is connected to the AD converter (64).

The invention discloses a solid rocket engine thrust control system and method based on a microwave field. The solid rocket engine thrust control system comprises a combustion chamber shell, an annular heat insulation layer arranged around the inner wall of the combustion chamber shell and an annular grain. An empty runner is formed in the middle of the grain; the inner side of the front end of the combustion chamber shell is connected with the heat insulation layer and the igniter; the igniter is mounted on the inner wall of the grain; the gas outlet end of the combustion chamber shell is sequentially provided with a spray pipe convergent section, a spray pipe throat and a spray pipe expansion section. A pressure sensor, a temperature sensor and a force transducer are distributed on the outer side of the expansion section of the spray pipe, and the pressure sensor, the temperature sensor and the force transducer transmit acquired engine performance parameters to a monitoring terminal through electric signals; the monitoring terminal outputs electric signals to the impedance converter and the microwave power supply according to working condition requirements, the intensity of a microwave field is changed, and thrust regulation and control of the solid rocket engine are achieved. The size of microwave output is adjusted according to working conditions, and thrust regulation and control of the solid rocket engine are achieved.

The present invention provides a method and device for increasing the beam duty cycle by using colored noise, and relates to the field of particle accelerators and signal processing technology. The method comprises: generating a digital noise signal through a finite impulse response filter; converting the digital noise signal into two branch signals of equal magnitude and opposite sign through a phase shifter; and loading the two branch signals onto a transverse electrode plate after each of the two branch signals passes through an attenuator, an amplitude modulator, an impedance converter, and an all-pass network in sequence, thereby obtaining an extracted beam subjected to transverse excitation. The present invention can effectively improve the impact of the current traditional RF-KO sweep mode on beam extraction, making the time structure of the slow extraction beam more uniform, promoting the widespread application of precise point scanning, and improving treatment efficiency.

The invention relates to a transmission and reception device with a broadband HF power amplifier, in particular an N-way Doherty amplifier with active load modulation. The object of the invention is to provide a high-power transmission and reception device suitable for high-power and broadband applications and having a transmission power of more than 10 Watts to approximately 2000 Watts by means of appropriate design measures in combination with electronic components, starting from a transmission and reception device with a module (GSZ) having a configurable HF high-power amplifier (HPA) that operates between and below two power back-off points and comprises a main power amplifier (DM) with an amplifier core and at least one peak power amplifier (DP1) with an amplifier core, wherein a digital input signal distributor (ET) is provided, which is connected to the input of the main power amplifier (DM) and to the input of the at least one peak power amplifier (DP1) and has a plurality of outputs, and an output combiner connected to the output of the amplifier core of the main power amplifier and the output of the at least one peak power amplifier is provided. This object is achieved according to the invention, in which an additional multiharmonic transformation line (LAH) is provided at the amplifier core output of a main power amplifier (DM) and at the amplifier core output of at least one peak power amplifier (DP1) and a circulator (Z1) connected to the output of an impedance converter (AN1) or an output combiner (C). By means of the circulator (Z1), the upstream main power amplifier (DM) and at least one peak power amplifier (DP1) are protected from overvoltage and overcurrent on the output side, because the circulator (Z1) transfers energy to a collecting resistor (W1) connected to the circulator (Z1). The invention belongs to the field of broadband amplifiers, in particular broadband Doherty amplifier circuits.

The utility model provides a broadband dipole antenna and a radar system. The broadband dipole antenna comprises a dielectric substrate, a first radiation oscillator and a first impedance converter which are arranged on the top layer of the dielectric substrate, a second radiation oscillator and a second impedance converter which are arranged on the bottom layer of the dielectric substrate, and an antenna interface, the first end of the first impedance converter is connected with the signal end of the antenna interface, and the second end of the first impedance converter is connected with the feeder line end of the first radiation oscillator; the first end of the second impedance converter is connected with the grounding end of the antenna interface, and the second end of the second impedance converter is connected with the feeder line end of the second radiation oscillator; the first radiation oscillator and the second radiation oscillator are arranged in a left-right axial symmetry mode, and the first radiation oscillator and the second radiation oscillator are both of a gradual change structure. According to the antenna, the radiation oscillator is of a gradual change structure, resonance can be achieved in a wide frequency range, the working frequency range of the antenna is widened, and the percentage bandwidth of the antenna is effectively improved.

The invention relates to the technical field of synchronous particle accelerators, and provides a broadband radio-frequency voltage sampling device based on a magnetic alloy material, and the device comprises a capacitance voltage division circuit, one end of which is used for connecting a radio-frequency high-voltage end; the multiple is used for adjusting the sampling ratio; one end of the broadband impedance converter is connected with the other end of the capacitance voltage division circuit; the broadband impedance transformer comprises a first magnetic alloy ring and a first multi-core twisted wire; and the radio frequency N-type connector is connected with the other end of the broadband impedance converter, and the radio frequency N-type connector is a voltage sampling output port. According to the broadband radio frequency voltage sampling device based on the magnetic alloy material provided by the invention, the first magnetic alloy ring has very high magnetic conductivity and has a relatively low quality factor Q value, so that the broadband radio frequency voltage sampling device has an excellent broadband, and the low-frequency band characteristic of the impedance conversion circuit is greatly improved; the problem of broadband of a radio frequency voltage sampling circuit and the problem of poor performance of a low frequency band are well solved.

To provide an impedance converter capable of obtaining satisfactory characteristics in a wide band.SOLUTION: With the impedance converter 1 in which the low-band impedance converting circuit 12 and the high-band impedance converting circuit 11 are connected in parallel between the input terminal IN and the output terminal OUT, and with a circuit configuration in which the phase of the pass characteristic of the high-pass filter formed by the high-band impedance converting circuit 11 is delayed with respect to the phase of the pass characteristic of the low-pass filter formed by the low-band impedance converting circuit 12, the phases of the pass characteristics can be matched when the frequency bands are combined. As a result, an impedance converter having favorable impedance conversion performance in a wide band is realized.SELECTED DRAWING: Figure 1

The embodiment of the present invention relates to the field of microwave communication technology and discloses an ultra-wideband cavity filter, comprising: a first RF coaxial connector, a second RF coaxial connector, a housing cavity, a single-ridged waveguide body disposed in the housing cavity, a first impedance converter, a second impedance converter, a first stripline, and a second stripline; multiple pairs of symmetrical grooves are disposed on both sides of the single-ridged waveguide body; one end of the single-ridged waveguide body is connected in sequence to the first impedance converter, the first stripline, and the first RF coaxial connector, and the other end is connected in sequence to the second impedance converter, the second stripline, and the second RF coaxial connector; the first RF coaxial connector and the second RF coaxial connector are respectively fixed at both ends of the outer surface of the housing cavity. Through the above method, the cavity filter realized by the embodiment of the present invention not only improves the operating frequency bandwidth and power capacity, but also makes the installation and tuning of the equipment more convenient.

The present invention relates to a low-frequency, broadband, high-power, compact impedance transformer, comprising a rectangular coaxial impedance transformer and a coaxial quick-connect connector connected to the rectangular coaxial impedance transformer. The rectangular coaxial impedance transformer comprises a base plate and a cover plate, which are fixedly connected by bolts. An inner conductor is provided at the upper end of the base plate, and an interface is provided at the lower end of the base plate, through which the coaxial quick-connect connector connects to the inner conductor. The present invention employs a rectangular coaxial coiled structure for the impedance transformation section of the inner conductor to reduce its axial length. The inner conductor is disposed on a dielectric plate C and secured via a dielectric plate D, thereby resolving the difficulty of mechanically processing the dielectric plate D. Furthermore, the overall compact design meets the client's requirements for a smaller installation space.

An exemplary embodiment of the invention relates to an electrical amplifier (10) comprising a differential preamplifier (PA) having a first output port and a second output port, and a downstream amplifier stage (DAS) having a first output unit and a second output unit; wherein the first output unit is connected to the first output port of the differential preamplifier (PA) and the second output unit is connected to the second output port of the differential preamplifier (PA); and wherein a negative impedance converter is electrically located in at least one of said differential preamplifier (PA) and said downstream amplifier stage (DAS).

The present application relates to a pseudo-Doherty load modulated balanced amplifier (PD-LMBA), and to a mobile communication base station comprising the PD-LMBA. The present application relates to a load modulated balanced amplifier (PD-LMBA) and to a mobile communication base station comprising the PD-LMBA. According to the invention, the PD-LMBA comprises a phase offset unit comprising at least one shunt series circuit connected to the ground, each shunt series circuit comprising an impedance transformer and a termination circuit arranged between the impedance transformer and the ground, the termination circuit is configured to present an RF short circuit to the impedance transformer at a first frequency within or near the frequency band, where the impedance transformer is configured to transform the RF short circuit to an RF open circuit at the first frequency. The phase offset unit further comprises at least one parallel resonant circuit arranged between the input and the output of the phase offset unit, where an impedance of the at least one parallel resonant circuit corresponds to an RF open circuit at a second frequency outside the frequency band. The first frequency is closer to a center frequency of the frequency band than the second frequency.

The present invention relates to an ultra-fast 10ps differential Gaussian pulse generator with adjustable amplitude. The generator comprises a pulse shaping circuit, a high-voltage conversion circuit, a low-voltage conversion circuit, a high-voltage regulation circuit, an avalanche circuit, a first low-voltage regulation circuit, a first step circuit, a second low-voltage regulation circuit, a second step circuit, a differential circuit, a bandpass filter, and an impedance converter. The ultra-fast picosecond differential Gaussian pulse generator disclosed herein utilizes avalanche technology, with the adjustment circuit added to the avalanche circuit to achieve adjustable pulse amplitude.

The present invention discloses a novel balanced-unbalanced matching impedance converter device. The device comprises impedance converters with eight impedance conversion ratios, a fixing plate, and a PVC chassis. The impedance converter for each impedance conversion ratio comprises a ferrite core transformer, an input resonant capacitor, an output resonant capacitor, an unbalanced input terminal, a balanced output terminal, a PVC pipe, and a PVC pipe sleeve. The ferrite core transformer is composed of a toroidal core, a primary winding, and a secondary winding. The toroidal core is composed of multiple stacked toroidal manganese-zinc ferrite cores, and the primary and secondary windings are each wound with multiple strands of silver wire. An input resonant capacitor is connected in parallel between the primary windings, and the unbalanced input terminal is an N-type female connector. An output resonant capacitor is connected in parallel between the secondary windings, and the balanced output terminal is a 4mm banana connector. The present invention can achieve eight types of impedance conversion.

The invention provides a semiconductor device and a Doherty amplifier circuit. The semiconductor device includes: a package (30) including a base and an output lead; a first semiconductor chip (40a) including a main amplifier that amplifies the first signal and a first output pad that outputs the amplified first signal; a second semiconductor chip (40b) including a first peak amplifier that amplifies a second signal and a second output pad that outputs the amplified second signal; a third semiconductor chip (40c) including a second peak amplifier that amplifies a third signal and a third output pad that outputs the amplified third signal; the first end of the first impedance converter is electrically connected to the first output bonding pad and the output lead, and the second end of the first impedance converter is electrically connected to the second output bonding pad and the third output bonding pad; a first matching circuit that matches the impedance of the first output pad and the impedance of the first terminal with each other; and a second matching circuit matching the impedance of the second output pad and the impedance of the second terminal with each other.

A radio frequency (RF) generating device for generating RF output signals is provided. The RF generating device includes: a controller configured to generate an RF control signal and a gain control signal; a plurality of RF signal generators, each RF signal generator being configured to generate an RF signal having at least one of a frequency and a phase determined based on the RF control signal; a plurality of RF amplification modules, each RF amplification module being configured to receive the RF signal generated by a corresponding RF signal generator and generate an RF amplification signal by controlling a gain of the RF signal based on the gain control signal; an RF switch module configured to select at least one of the RF amplification signals generated by the RF amplification modules and generate an RF output signal in a form of a multi-level pulse based on the selected at least one of the RF amplification signals; and an impedance converter connected to an electrode of an external load and configured to convert a load impedance into a target impedance having a target range, the load impedance being an impedance of the external load.

This invention relates to the field of graded impedance converter technology, and more particularly to a graded impedance converter and its processing method. The graded impedance converter includes: a graded section consisting of a beveled outer conductor and a core wire passing through the interior of the beveled outer conductor, and an assembly section disposed at one end of the graded section. The processing method includes: mixing and curing polytetrafluoroethylene (PTFE) dispersion powder with an extrusion aid to form a blank; extruding the blank through an annular gap while simultaneously coating the inner conductor to form a wet blank insulation layer; during the extrusion process, adjusting the extrusion speed according to the temperature anomaly region, adjusting the preheating temperature according to the interface distance between the rigidity anomaly region and the inner conductor, and compensating the extrusion pressure of the annular gap according to the vibration intensity and the area of ​​the rigidity anomaly region; subsequently, drying, sintering, copper tube drawing and beveling, and assembly are performed to obtain the graded impedance converter. This invention achieves continuous impedance transformation of the graded impedance converter.

The utility model relates to the technical field of network cable analyzer calibration, in particular to an impedance converter of a network cable analyzer, which comprises two RJ45 adapter interfaces, four N-type radio frequency interfaces and four impedance conversion modules, each N-type radio frequency interface is connected with the input end of one impedance conversion module, and the other N-type radio frequency interface is connected with the output end of the other impedance conversion module. The output end of each impedance conversion module is connected with the two RJ45 adapters respectively; the impedance conversion module comprises a first balun transformer, a second balun transformer and a third balun transformer, the first balun transformer is connected with the second balun transformer and the third balun transformer in sequence, the first balun transformer is used for achieving impedance conversion and conversion of unbalanced end signals and differential balance signals, and the second balun transformer is used for achieving differential balance signals. And the second balun transformer and the third balun transformer are used for dividing one path of input into three paths of output. According to the utility model, broadband measurement requirements of calibration of a network cable analyzer can be met, full-project calibration of different regulation requirements can be completed, and the problem of characteristic impedance matching of 100 omega or 150 omega of the characteristic impedance of a twisted pair is solved.

This invention relates to a high-frequency plasma light source (1), wherein, in the operating state, a quasi-capacitively coupled plasma is formed by at least two plasma anchors (6, 7), thus the plasma region with the highest energy density is spatially decoupled from the plasma anchors (6, 7). The high-frequency plasma light source (1) includes: - a pressure chamber (5) containing a gaseous medium, in the operating state, a luminescent plasma is formed within the pressure chamber; - an impedance converter (4) assembly connected to the pressure chamber (5) and including a coupling pin (8) for coupling electromagnetic waves into the high-frequency plasma light source (1) and having an internal guide... The inner conductor (9) and the outer conductor (9b) are coaxial conductors (9a) and (9b), wherein a dielectric pressure seal (13) and at least one conductive or dielectric connector (10, 12) are provided between the inner conductor (9a) and the outer conductor (9b), an inner conductor plasma anchor (6) extending into the pressure chamber (5) and electrically and mechanically connected to the inner conductor (9a) of the coaxial conductor (9), and an outer conductor plasma anchor (7) having a first end (7a) located in the pressure chamber (5) and a second end (7b) mechanically connected to the inner surface of the pressure chamber (5).

The present invention relates generally to the field of electret capsule, and more particularly to a circuit configuration of an impedance converter integrated in an electret capsule such as for use in condenser microphones. The electret capsule of a microphone may include a gate biasing field effect transistor (FET) to facilitate biasing of a low noise FET. Advantageously, the use of low noise FET in the electret capsule of a microphone provides for a reduced cost, while achieving lower self-noise.

The invention relates to the technical field of radio frequency multi-vector synthesis impedance transformers, solves the technical problem that a vector synthesis transformer needs to measure a large number of complex impedance points during multi-vector synthesis, so that the consumed time is long, and particularly relates to a radio frequency multi-vector synthesis impedance transformer and a method for measuring the complex impedance points. Comprising a multi-vector impedance converter serving as a main body, and a measuring module used for measuring a plurality of complex impedance points required by multi-vector synthesis is arranged in the multi-vector impedance converter. According to the method, measurement data of N1 * N2 *... * Nn complex impedance points can be obtained only by measuring N1 + N2 +... + Nn complex impedance points without positioning massive complex impedance points of each vector converter combination one by one, so that radio frequency multi-vector synthesis rapid measurement becomes possible, the measurement time is greatly shortened, and the measurement efficiency is improved. Therefore, the design and test efficiency of the high-power radio frequency chip, module and system is greatly improved.

An outphasing amplifier includes a first amplifier, a second amplifier, a first coupler coupling a first signal and a third signal, a second coupler coupling a second signal and a fourth signal, a first impedance converter inputting the first signal coupled with the third signal, a second impedance converter inputting the second signal coupled with the fourth signal, a combiner combining the first and the second signals output from the first and the second impedance converters and outputting an output signal, and a signal processor outputting the first signal having a first phase to the first amplifier, outputting the second signal having a second phase to the second amplifier, outputting the third signal having at least one of a third phase and a first amplitude to the first coupler, and outputting the fourth signal having at least one of a fourth phase and a second amplitude to the second coupler.

A multiplexer includes an impedance converter. The impedance converter includes: a transmission line having a length of λ / 4 (λ is an in-transmission-line wavelength of a signal) and a characteristic impedance of 35Ω; and a transmission line having a length of λ / 4 and a characteristic impedance of 70Ω. The impedance converter includes: a transmission line having a length of λ / 4 and a characteristic impedance of 35Ω; and a transmission line having a length of λ / 4 and a characteristic impedance of 70Ω.

The present application provides a power amplification module, which aims to properly combine a wideband signal while reducing the module. The power amplification module comprises: a first amplifier, which amplifies the power level of a first input signal of a given frequency band and outputs a first signal of a first power level; a first impedance converter connected with the first amplifier and comprising a transmission line transformer; a second amplifier, which amplifies the power level of a second input signal of the given frequency band and outputs a second signal of the first power level; a second impedance converter connected with the second amplifier and comprising a transmission line transformer; and a combiner, which combines the first signal input through the first impedance converter and the second signal input through the second impedance converter into an output signal of a second power level greater than the first power level, and comprises a transmission line transformer.

An inkjet printing system includes: an inkjet head including a plurality of nozzles that eject ink; a driver that controls driving of the plurality of nozzles; an impedance converter located between the driver and the inkjet head, the impedance converter having an impedance which varies based on a magnitude of an input voltage provided by the driver; and a self-sensing circuit part connected to an input terminal of the inkjet head and an output terminal of the impedance converter, the self-sensing circuit part measuring a self-sensing voltage for each nozzle.

To provide an amplifier which includes a simple circuit configuration and has highly efficient and wide band characteristics.SOLUTION: An amplifier device comprises: a first substrate with a first impedance converter which converts impedance of output signal of a first amplifier amplifying inputted first signal; a second substrate with a second impedance converter which converts impedance of output signal of a second amplifier amplifying inputted second signal; and a third impedance converter a part of which is arranged in the first substrate and the other of which is arranged in the second substrate, and which has an electrical component passing AC signal and blocking DC signal. The output signal of the first impedance converter and the output signal of the third impedance converter are combined and output.SELECTED DRAWING: Figure 12

A microphone is disclosed. The microphone comprises an electromechanical transducer (ET) configured for converting sound waves into an electric signal to be supplied at an output (4) of said transducer; an impedance converter (IC) having an input (6) for receiving an electric signal and an output (8) for providing an electric output signal; a power supply regulator (PSR) for powering said impedance converter (IC); said power supply regulator comprising power supply input (10) and a regulated output (12); a microphone output connector (MOC) comprising a ground connector pin (1), a first signal connector pin (2) and a second signal connector pin (3); and a switchable output stage (200). The switchable output stage (200) comprises: a transformer (TR) comprising a primary winding (TR1) having a first end terminal (TR1a) and a second end terminal (TR1b); and having a first secondary winding (TR2) and a second secondary winding (TR2'), electrically coupled in series at a tap point terminal (TPT); and further having a first end terminal (TR2a) and a second end terminal (TR2b); and a switch (S) comprising a first switch section (S1) and a second switch section (S2). The switch S is being configured to be switched between a first configuration and a second configuration. Hereby, the microphone may be switched between a first configuration in which the signals conveyed to the first signal connector pin (2) and / or the second signal connector pin (3) of the (MOC) is a signal which predominantly originates from the secondary windings (TR2,TR2') of the transformer (TR); and a second configuration in which the signals conveyed to the first signal connector pin (2) is a signal which predominantly has bypassed that transformer TR.