46 results about "Impedance transformer" patented technology

A single-torus ohmmeter for measuring a loop impedance Zx, includes a single transformer having a primary winding of Np coils and a secondary winding of a single coil forming the measurement loop, in which, to compensate for a stray induction produced by an AC leakage current circulating in the measurement loop without canceling a measurement current Ip generating an alternating induction of constant average value for the measurement of the loop impedance Zx, the transformer includes a second secondary winding of Na coils whose output voltage Ub representative of the AC leakage current is delivered to a processing module providing a voltage intended to be added to an alternating measurement voltage Vp in an adder delivering the current to be injected into the primary winding after passage through a voltage-current converter.

The application discloses a method for simulating the parameters of a generator neutral point grounding system of an extended unit connection, which comprises an actual generator system and a simulated generator system in parallel operation, wherein the simulated generator system comprises a low zero sequence impedance transformer, a three-phase capacitor bank and a simulated generator neutral point grounding device; the parameter simulation test comprises the following steps: S1, relay protection configuration; S2, neutral point asymmetric voltage test of the generator neutral point grounding system of the extended unit connection; S3, neutral point displacement voltage test of the generator neutral point grounding system of the extended unit connection; S4, maximum capacitive current test of single-phase grounding of the generator neutral point grounding system of the extended unit connection; and S5, maximum fault current test of single-phase grounding of the generator neutral point grounding system of the extended unit connection. The application can effectively verify the grounding system performance of different grounding modes of the generator of the extended unit connection and determine whether the generator neutral point grounding mode meets the technical requirements.

The diamond sensor includes: a diamond having a color center with electron spins; a transmission circuit that transmits electromagnetic waves; an irradiation unit that irradiates the diamond with electromagnetic waves; an impedance transformer and / or a resonator; and a protection circuit for protecting an electromagnetic wave source that supplies electromagnetic waves, the protection circuit functioning as a capacitor for the electromagnetic waves and functioning as an inductor at a frequency lower than the frequency of the electromagnetic waves, and the protection circuit functioning as an inductor at a frequency lower than the frequency of the electromagnetic waves when the impedance transformer and the resonator are included. The protection circuit is disposed between the impedance transformer and the resonator, between the transmission circuit and a transmission cable connecting the transmission circuit and the electromagnetic wave source, or between the transmission cable and the electromagnetic wave source.

A Doherty power amplifier includes a first amplifier with a first output capacitance, a second amplifier with a second output capacitance, a reconfigurable impedance inverter, and a variable output impedance transformer. The reconfigurable impedance inverter includes a combining node and first, second, and third variable networks. The first variable network and the first amplifier output capacitance establish a first amplifier effective output capacitance that is less than the first output capacitance. The second variable network provides a series inductance between the first amplifier output and the combining node. The third variable network and the second amplifier output capacitance establish a second amplifier effective output capacitance that is less than the second output capacitance. The output impedance transformer includes a fourth variable network that establishes a combining node impedance. The first, second, and third variable networks and the output impedance transformer may be reconfigured based on traffic loading conditions.

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 application provides a high-selectivity and simple-structure filter power amplifier and radio frequency integrated circuit, and relates to the field of power semiconductor devices.The application provides stable gate and drain bias voltages for the power amplifier transistor through a gate DC bias network and a drain DC bias network, and guarantees stable operation of the device.The input end and the output end impedance matching network are symmetrically arranged around the power amplifier transistor, both of which contain the same filter impedance transformer, and the layout is compact and simple, without additional independent filter module, effectively simplifying the circuit structure and improving the miniaturization level.Further, the filter impedance transformer is formed by cascading two λ / 4 parallel coupled microstrip lines and is matched with a λ / 2 open microstrip line, and based on the transmission line impedance transformation principle, the filter impedance transformer realizes fundamental real impedance matching, reduces signal transmission loss, forms transmission zero points in the stop band, and significantly improves the frequency selectivity.The overall circuit has high integration, excellent performance, and good engineering application and promotion value.

The application discloses a balanced-to-balanced coaxial line impedance transformer, and belongs to the electronic technical field.The coaxial line impedance transformer is composed of four coaxial lines with the same characteristic impedance and electrical length, the coaxial line has an inner conductor and an outer conductor, the coaxial line impedance transformer has two balanced radio frequency ports Z L and Z H , and the 2.25:1 Z H / Z L impedance transformation ratio is realized by connecting the inner conductor and the outer conductor between different ports of the four coaxial lines.The application breaks through the minimum impedance transformation ratio of 4:1 that can be realized by the prior art, can satisfy the impedance transformation requirement below 4:1, can be combined with other impedance transformers to realize the impedance transformation ratio with smaller discrete value, is helpful to the miniaturization, low insertion loss and multi-path power synthesis scheme, and can satisfy the high power and high efficiency application demand above 2kW.

The application discloses a kind of λ / 4 stepped impedance transformation method and system.Therein, the method includes: in the impedance mismatching of partial discharge ultrahigh frequency load impedance and the characteristic impedance of partial discharge ultrahigh frequency measurement system, access λ / 4 stepped impedance transformation two-port network, the load impedance is wave impedance;According to characteristic impedance Z 0, wave impedance Z L And the characteristic impedance of two-section λ / 4 transmission line Z 1, Z 2, determine partial voltage reflection coefficient;According to the partial voltage reflection coefficient, determine total voltage reflection coefficient;According to the total voltage reflection coefficient, broaden the working frequency band of λ / 4 stepped impedance transformer.Therefore, break through the limitation of direct matching, by the progressive stepped impedance matching mode of sensor element, realize partial discharge ultrahigh frequency signal sensor element and subsequent radio frequency processing circuit good matching, thereby reduce the partial discharge ultrahigh frequency signal attenuation caused by impedance mismatching.

The invention belongs to the field of broadband power amplifiers, and particularly relates to a broadband impedance converter. The circuit comprises an input impedance converter, an input matching unit, a driving power amplifier, an inter-stage matching unit, a final-stage power amplifier and an output impedance converter. According to the invention, based on the HBT technology, coupling among multiple layers of metal is utilized, so that an ultra-wideband impedance converter is realized; the broadband impedance transformer can provide a required load line for the power amplifier in a very wide frequency band range; the broadband impedance converter can simplify the input matching of the ultra-wideband power amplifier and reduce the design complexity. Based on the impedance transformer and the ultra-wideband power amplifier structure, the designed wideband amplifier is high in bandwidth, high in efficiency, simple in design and small in area.

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.

This invention proposes a feed network and its design method for a multi-band common-aperture satellite communication antenna, relating to the field of satellite communication technology. This invention employs a three-dimensional heterogeneous layout, placing the low-frequency and high-frequency feed networks on the bottom and top layers of a multilayer dielectric substrate, with a shared ground layer in between. This effectively solves the problem of large space occupation in traditional discrete layouts. For the low-frequency network, characteristic mode theory guides the microstrip feeder design, and a stepped impedance transformer is loaded at the terminal, enabling good impedance matching for low-frequency signals across a wide bandwidth. For the high-frequency network, substrate-integrated waveguide technology is used to construct the signal transmission trunk and coupler gaps are set. Finally, a defective ground structure and a frequency-selective surface are simultaneously integrated on the shared ground layer through a single photolithography process. This allows the design to simultaneously achieve the dual functions of suppressing low-frequency leakage and transmitting high-frequency signals on the same physical layer.

An impedance matching network (10) for an active RFID transceiver (1), the impedance matching network (10) including: an impedance transformer (14) including a transformer input (13) and a transformer output (15), wherein the transformer input (13) is connectable to an antenna (12), an RF modulator (16) connectable to the transformer output (15), and an RF demodulator (20) capacitively coupled to the transformer output (15) via a capacitor (18).

The invention discloses a radio frequency impedance converter based on a non-uniform transmission line and a design method and device, and relates to the technical field of radio frequency circuits. The method comprises the following steps: respectively determining quantitative dependency relationships between unit length line impedance and unit length line admittance of the uniform transmission line and preset geometric parameters; setting a change distribution scheme of preset geometric parameters of the non-uniform transmission line in the length direction; according to the first quantitative dependency relationship and the change distribution scheme, determining a first distribution relationship that the unit length line impedance of the non-uniform transmission line changes along with the length coordinate; according to the second quantitative dependency relationship and the change distribution scheme, determining a second distribution relationship of the unit length line admittance of the non-uniform transmission line along with the change of the length coordinate; according to the first distribution relation and the second distribution relation, determining a third distribution relation that the current characteristic impedance of the non-uniform transmission line changes along with the length coordinate; and determining the minimum length of the radio frequency impedance transformer based on the non-uniform transmission line based on the third distribution relation and the optimized change distribution scheme.

The application belongs to the technical field of communication, and particularly relates to a kind of miniaturized Vivaldi antenna of ultra-wideband.The antenna contains a dielectric substrate, the upper surface of which contains an exponential tapered slot main Vivaldi antenna, four resistors and two rectangular metal patches, artificial surface plasmon;The lower surface is a feed network, containing 6 sections of impedance transformation microstrip transmission line, sector transmission line and circular slot;The main antenna is placed in the center of the dielectric substrate, the four resistors are placed at the end of the main antenna, and the resistors are connected to the two rectangular patches behind;Artificial surface plasmon is placed in the middle of the main antenna's tapered slot;The multi-section impedance transformer of the feed network and the microstrip slot line structure are placed in alignment with the circular slot of the main antenna.The application realizes ultra-wideband, miniaturization and high radiation gain through the design of the main antenna, edge slotting, resistor loading and artificial surface plasmon.The antenna's operating frequency band is 0.2 GHz to 18 GHz, and it has the characteristics of miniaturization.

The invention discloses a superconducting frequency mixing device, a preparation method and a superconducting quantum computer, and relates to the technical field of electronics. In the application, the superconducting frequency mixing device comprises a first port, a second port, a third port, a first filter network, a second filter network and a parametric impedance converter, and the parametric impedance converter comprises at least one Josephson junction. Wherein the first port used for receiving microwave signals is connected with the input end of the first filter network, the second port used for receiving local oscillator signals is connected with one input end of the parametric impedance converter, and the other input end of the parametric impedance converter is connected with the output end of the first filter network. Therefore, the first port and the second port are isolated through the first filter network, that is, the microwave signal and the local oscillator signal are isolated through the filter network, the signal isolation degree is improved, and the frequency mixing effect is improved.

The invention provides a broadband wide-angle tight coupling dipole array antenna working at a Ka wave band. The broadband wide-angle tight coupling dipole array antenna is composed of a plurality of antenna units arranged in a matrix mode. Each unit comprises a single-layer Rogers 5880 dielectric substrate, a bottom-layer metal floor, an upper-layer wide-angle matching layer and a tight dipole radiation layer; wherein the tail ends of vibration arms of the bow-tie-type dipole units are mutually overlapped to enhance coupling, the hyperbolic impedance transformers realize conversion from unbalance to balance and broadband matching, the short-circuit metal wires inhibit common-mode resonance, and the wide-angle matching layer is a frequency selective surface formed by rectangular metal patches. Passive edge units are additionally arranged on the two sides of the array, outer side short-circuit lines are removed to slow down the truncation effect, the metal wall and the floor are integrally machined, the active standing-wave ratio within 27.5-35 GHz is smaller than or equal to 2.1 when + / -50-degree scanning is supported, and the efficiency is larger than or equal to 80%. The antenna has the advantages of low profile, high integration, wide bandwidth angle and high radiation efficiency, and is suitable for a millimeter wave communication system.

Systems and methods for improving operations of an antenna element. The methods comprise: coupling an impedance transformer to a ground plane structure of the antenna element (wherein the impedance transformer comprises at least one conductive structure protruding out and away from the ground plane structure in a direction towards a helical structure of the antenna element); adjusting a size of a gap provided between the at least one conductive structure of the impedance transformer and the helical structure until an impedance of the helical antenna matches an impedance of a transmission line at one or more frequencies; and securing the impedance transformer to the ground plane structure so that the size of the gap is maintained while the antenna element is being used to facilitate communications.

The invention discloses an antenna array multi-branch impedance compression method and device, and the method comprises the steps: enabling three microstrip lines with the same characteristic impedance to be correspondingly connected with three loads, and constructing a one-to-three multi-branch network; setting the electrical length of the three microstrip lines based on the matching requirement of impedance compression; calculating through a microstrip line transmission formula to obtain input impedance corresponding to the three loads; performing parallel processing on the three input impedances to obtain a total impedance; the output end of the parallel circuit is connected with a section of set impedance converter; the total impedance is converted into standard impedance by setting an impedance converter, and basic impedance compression matching is completed; based on feed requirements of different antenna arrays, a one-to-three multi-branch network and a double-branch impedance compression network or a power divider are combined and expanded to form a one-to-multiple impedance compression network, and an impedance stabilization target in a multi-port feed scene is achieved. The problem that the impedance matching requirement of a one-to-three or more multi-branch feed network cannot be met in the prior art is solved.

This utility model discloses a low-frequency power divider, which includes a cavity with an input port and an output port. The output port is connected to the input port via an impedance transformer. The impedance transformer includes at least two low-impedance inner conductors spaced apart, with a high-impedance inner conductor connected in series between adjacent low-impedance inner conductors. The high-impedance inner conductor is configured as a three-dimensional spiral coil extending spirally between adjacent low-impedance inner conductors. The high-impedance inner conductor serves as a distributed inductance element. This coil structure can achieve a high inductance value within a limited physical space, thereby significantly shortening the required physical length of the high-impedance line and reducing the overall size of the power divider.

The application relates to a magnetic loading material test platform and a use method thereof, characterized in that the platform comprises a cold-state test platform and a hot-state test platform; the cold-state test platform comprises a cold-state measurement support, a supporting rotating disc, a measurement line and a network analyzer; the measurement line is used for forming a magnetic coupling loop around the to-be-measured magnetic loading material during measurement, and the network analyzer is used for measuring the cold-state performance of the to-be-measured magnetic loading material through the test line; the hot-state test platform comprises a coaxial cavity device, a cooling unit, an impedance transformer, an adjustable capacitor, a solid-state power source, an oscilloscope and a surface temperature test system; the application can obtain accurate cold-state test data and hot-state test data of the to-be-measured magnetic loading material, and can be widely applied in the test field.

This application provides a control method and device for parallel LC-type energy storage converters in weak power grids, applicable to the field of power technology. The method includes: constructing a PCS topology for the LCL-type energy storage converter based on multiple parallel LC-type energy storage converters and the line impedance and transformer short-circuit impedance on the grid side; constructing a third-order mathematical model based on the PCS topology; wherein the third-order mathematical model includes the differential model of the filter inductance and the differential model of the filter capacitor of the LC-type energy storage converter, as well as the differential model of the equivalent inductance of the line impedance and transformer short-circuit impedance; identifying parameters of the differential model of the equivalent inductance based on a sliding mode observer to obtain the observed values ​​of unknown parameters in the third-order mathematical model; wherein the unknown parameters include the equivalent impedance of the line impedance and transformer short-circuit impedance, and the grid-side voltage on the grid side; and obtaining the output control voltage based on the observed values ​​of the unknown parameters and the third-order mathematical model. This application improves the stability of the energy storage converter control.

The utility model discloses a KU wave band band-pass waveguide filter comprising a lower seat which is internally provided with a ripple filtering groove penetrating through two sides; the upper cover is buckled at the top of the lower seat and is fixed, so that the corrugated filtering grooves are encircled to form a single filtering channel; the input end is arranged at one end of the filtering channel; the output end is arranged at the other end of the filtering channel, and the filtering channel can be communicated end to end under the action of the input end and the output end; the impedance transformer is arranged at the input end of the filtering channel; the impedance transformer comprises at least two right-angle bosses formed on one side wall of the lower seat. According to the KU wave band band-pass waveguide filter provided by the utility model, through the arrangement of the lower seat and the upper cover, a single filtering channel can be formed between the input end and the output end, and the inner side plane of the upper cover is attached to the top of the lower seat for assembly, so that the filtering channel can be formed, and meanwhile, the overall size can be reduced.

The invention discloses an ultra-high-voltage direct-current system fault early warning method and device and a storage medium, and the method comprises the steps: arranging an intelligent electric meter and a microenvironment sensor module at an ultra-high-voltage direct-current converter transformer, collecting and synchronizing electrical parameters and environmental parameters at high frequency in real time, carrying out the edge cleaning, and then driving a digital twin model to evolve in real time, thereby achieving the early warning of the fault of an ultra-high-voltage direct-current system. The model parameters are ensured to be consistent with a full life cycle mirror image of physical equipment, a digital twin model is utilized to deduce a full cycle commutation process forwards by taking a current working condition as an initial condition, an alternating current-direct current voltage ratio sequence at each commutation triggering moment is automatically extracted, and a self-adaptive interval discrimination algorithm is utilized to capture potential deviation in a millisecond level; once an abnormal state exists, N cycle instantaneous values before and after the abnormal state are traced back, negative sequence voltage and negative sequence current are generated, negative sequence impedance is estimated, and external faults and internal faults can be distinguished, early warning information is generated, and operators are reminded through double comparison with system short-circuit impedance and transformer leakage impedance.

The utility model discloses a high impedance dry type transformer with short circuit protection, comprising a cabinet and a three-phase dry type high impedance transformer arranged in the cabinet, one side of the three-phase dry type high impedance transformer is provided with a breaker input short circuit protection switch, the cabinet wall of the cabinet is provided with a temperature controller and a breaker, and the cabinet wall of the cabinet is provided with a short circuit protection switch. The temperature controller is provided with an overtemperature trip switch, the overtemperature trip switch of the temperature controller is electrically connected with the circuit breaker, and the circuit breaker input short circuit protection switch is electrically connected with the temperature controller and the circuit breaker respectively. According to the three-phase dry-type high-impedance transformer, high-impedance design is combined with the dry-type transformer, so that the impedance of the dry-type transformer is increased, short-circuit current can be limited, impact on a system is reduced, safety and environmental protection performance are improved, and a circuit breaker input short-circuit protection switch is arranged on one side of the three-phase dry-type high-impedance transformer, so that the safety of the dry-type transformer is improved. And over-current and short-circuit protection of the transformer can be realized by combining the temperature controller and the short-circuiting device, the response speed is high, and the protection effect is good.

The invention discloses a high-gain horn antenna based on neck contraction, which comprises a waveguide feed part, a horn neck and a horn aperture surface, and is characterized in that the horn neck consists of three sections of continuous linear tapered structures, namely a first expansion section, a contraction section and a second expansion section in sequence along the propagation direction of electromagnetic waves; the cross sectional area of the first expansion section is monotonically increased from the starting end to the tail end; the cross sectional area of the contraction section is monotonically decreased from the starting end to the tail end, and the cross sectional area of the narrowest part of the contraction section is smaller than the cross sectional area of the feed waveguide; and the cross section area of the second expansion section is monotonically increased from the starting end to the tail end to the horn aperture surface. The neck structure of the horn is regarded as a three-section impedance transformer, impedance matching from waveguide to free space can be further optimized, electromagnetic field distribution is optimized, energy reflection is reduced, and therefore more energy is transmitted to an aperture face.

The invention provides a broadband filtering impedance converter with a high impedance conversion ratio and a design method thereof, and belongs to the technical field of electrical equipment, the broadband filtering impedance converter comprises a first lambda / 4 wavelength transmission line, a first lambda / 4 wavelength short-path line, a second lambda / 4 wavelength transmission line and a second lambda / 4 wavelength short-path line which are sequentially connected between an input port and an output port; the other end of the first lambda / 4 wavelength short-path line and the other end of the second lambda / 4 wavelength short-path line are both grounded. The numerical value of the characteristic impedance is determined based on the target relative bandwidth, the target return loss and the impedance conversion ratio r by making the transfer function of the converter accord with the third-order Chebyshev filtering response; three transmission poles are generated in a passband, so that flat in-band response and expanded bandwidth are realized. Besides, circuit parameters can be directly determined according to specified design requirements, including impedance conversion ratio, bandwidth and in-band return loss (RL), so that the design process is greatly simplified.

The invention discloses a one-to-sixteen-path controllable antenna circuit applied to a high-frequency RFID (Radio Frequency Identification). The one-to-sixteen-path controllable antenna circuit comprises an RFID signal receiving module, a sixteen-path switching circuit, a four-wire sixteen-bit decoder, sixteen groups of antenna units, an MCU (Microprogrammed Control Unit), a detection circuit, a DC (Direct Current) voltage stabilizing module, an impedance tuning control switch and a frequency tuning impedance converter. The RFID signal receiving module receives an external RF signal and then transmits the external RF signal to the sixteen-path switching circuit, the MCU outputs a control signal to the four-wire sixteen-bit decoder, and the corresponding antenna unit is selected to be conducted with the sixteen-path switching circuit by adjusting the level of the input end of the decoder. Each group of antenna units comprises a PMOS (P-channel Metal Oxide Semiconductor) tube and an impedance tuning circuit, the PMOS tube controls the switch of the antenna unit, and the impedance tuning circuit is matched with the control switch to adjust parameters. The detection circuit detects RF signals and then transmits the RF signals to the MCU, the DC voltage stabilization module provides stable voltage, and the frequency tuning impedance converter achieves signal frequency and impedance matching. The circuit improves the signal transmission efficiency and the antenna control flexibility, and adapts to the multi-scene RF signal multi-path transmission and control requirements.

The invention discloses a multi-step impedance converter microwave sensing system based on parallel open circuit branches. By introducing the lossy microstrip line impedance formula, the optimal size of the impedance transformer under the condition of maximizing the transmission coefficient phase change rate is obtained, then the differential model of the output direct-current voltage and the dielectric constant is constructed, the optimal solution of the sensitivity is solved under the condition of considering the loss of the liquid to be detected, and therefore the detection performance is remarkably improved. In order to reduce the detection cost, a multi-step impedance converter is used as a load network, a reflection type radio frequency oscillator is designed according to a negative impedance theory, and the change characteristic of a dielectric constant is converted into oscillation frequency change. Furthermore, a frequency demodulation circuit is carried to demodulate the change of the oscillation frequency into the change of the direct-current voltage, so that the equipment cost is reduced. The microwave micro-flow sensor provided by the invention has the advantages of high sensitivity, convenience in detection and the like, and plays an important role in industrial and agricultural production.

The invention discloses a coaxial line impedance converter from balance to balance, and belongs to the technical field of electronics. The coaxial line impedance converter is composed of four coaxial lines with the same characteristic impedance and electrical length, each coaxial line is provided with an inner conductor and an outer conductor, the coaxial line impedance converter is provided with two balanced radio frequency ports ZL and ZH, and the ZH / ZL impedance conversion ratio of 2.25: 1 is achieved by connecting the different ports of the inner conductors and the outer conductors in the four coaxial lines. According to the invention, the minimum impedance conversion ratio of 4: 1 can be realized by breaking through the prior art, the impedance conversion requirement of less than 4: 1 can be met, meanwhile, the impedance conversion ratio with a smaller discrete value can be realized by combining with other impedance converters, a miniaturized and low-insertion-loss multi-path power synthesis scheme is facilitated, and the application requirements of high power and high efficiency of more than 2kW can be met.