13 results about "Impedance transformer" patented technology

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 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 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.

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.

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.

This invention belongs to the field of communication engineering technology, specifically an ultra-wideband multi-segment composite disc-cone antenna, comprising a radiator assembly, a feed assembly, an impedance matching assembly, and a grounding assembly. The radiator adopts a multi-segment composite structure, with a continuous copper plate conical surface in the low-frequency region and a radial spoke array in the high-frequency region, combined with a multi-layer coaxial disk and an electrically loaded structure. The feed end integrates a stepped impedance transformer and an LC composite matching network, and is equipped with a choke slot to suppress common-mode current. A wide grounding plane is configured at the bottom. By utilizing the segmented tapered surface and spoke array composite structure, the low-frequency continuous current path and the high-frequency discrete current path are separated on the same radiator, avoiding mutual interference between high- and low-frequency electromagnetic behaviors.

The application provides a PT symmetric system based on a negative impedance transformer and an energy efficiency and distance improvement method thereof, and is characterized in that: at least one negative impedance transformer is connected in series on a wireless power transmission loop, the negative impedance transformer is constructed based on a transformer and an operational amplifier, wherein: the transformer considers leakage inductance and magnetizing inductance, a primary winding of the transformer is connected in series in the transmission loop, one end of a secondary winding of the transformer is grounded, and the other end is connected to an inverting input terminal of the operational amplifier, and the operational amplifier is equivalent to a negative resistance module or a negative inductance module by configuring a resistance element or / and an inductance element on a corresponding branch. The effect is that: the flexible adjustment of the inductance ratio is realized by constructing a negative inductance on the primary side, the power extreme point is accurately approached, and the output current is optimized in combination with the primary side compensation negative resistance, so that the problem of small power is solved from the core parameter level.

The application provides a dual-band impedance transformer and a dual-band power amplifier. By determining a frequency point to be matched and a corresponding matching impedance in two preset frequency bands, the characteristic impedance and the electrical length of each microstrip transmission line used for composing the dual-band impedance transformer are obtained, so as to match the complex impedance of the two frequency bands to the real impedance, and the dual-band matching with controllable bandwidth ratio is realized. Furthermore, the dual-band power amplifier with controllable bandwidth ratio is composed based on the designed dual-band impedance transformer.

The utility model discloses a kind of Josephson parametric amplifier based on full impedance matching, it is related to superconducting quantum computing technical field.Josephson parametric amplifier includes substrate and the impedance transformer, resonator, superconducting quantum interference device and pump line sequentially arranged on substrate;Resonator and superconducting quantum interference device constitute resonant circuit, and resonator and superconducting quantum interference device are respectively used to provide the impedance and nonlinear inductance required for resonance;Impedance transformer, resonator and pump line are coplanar waveguide, and resonator and impedance transformer jointly constitute impedance network, provide the impedance required for signal amplification to realize high bandwidth high gain parametric amplifier.The utility model uses coplanar waveguide to realize the impedance network of full impedance matching, simplifies the manufacturing process of parametric amplifier, improves the consistency of preparation amplifier.Simultaneously, the coplanar waveguide based on superconducting material reduces the loss in signal amplification process, improves the reading efficiency of quantum signal.

An aspect relates to a signal power splitter / combiner including a first signal port; a first resistor; a first impedance transformer coupled in series with the first resistor between the first signal port and a first intermediate node; a second impedance transformer coupled between the first intermediate node and a second signal port; a third impedance transformer coupled between the first intermediate node and a third signal port; and a second resistor coupled between the second and third signal ports. The signal power splitter / combiner may further include a fourth impedance transformer coupled between the second impedance transformer and the second signal port, a fifth impedance transformer coupled between the third impedance transformer and the third signal port; and a third resistor coupled between a third intermediate nod.

This invention belongs to the field of mobile communication technology and discloses an antenna radome composed of multiple units arranged sequentially in a plane. Each unit includes orthogonally placed vertical dielectric substrate (1), horizontal dielectric substrate (2), vertical slot line (3), first horizontal slot line (4-1), second horizontal slot line (4-2), vertical impedance transformer (5), horizontal impedance transformer (6), vertical amplifier (7), horizontal amplifier (8), vertical bias network (9), horizontal bias network (10), power divider combiner (11), output impedance transformer (12), and several DC blocking capacitors. This radome achieves non-reciprocal polarization conversion characteristics over a wide frequency range, has high non-reciprocal isolation, and has advantages such as low angle sensitivity and easy integration.

The application relates to a C-band self-biased circulator with a high-frequency filtering function and relates to the technical field of microwave / millimeter wave passive devices. The circulator comprises a composite substrate and a microstrip circuit formed on the composite substrate; wherein the composite substrate is obtained by gradually embedding a first ferrite substrate, a second ferrite substrate and a dielectric substrate in a concentric circle mode from inside to outside. The ferrite substrate is composed of a high-saturation-magnetization ferrite inner core and a low-saturation-magnetization ferrite outer ring, the difference in permeability of the two can excite a perimeter mode at the boundary, and the working bandwidth of the circulator can be significantly widened. Meanwhile, the center circle is matched with an asymmetric stepped impedance transformer, which not only ensures high isolation and good matching of the main band, but also forms a controlled filtering / trap function in the high-frequency band, thereby realizing the dual functions of 'band pass + band out suppression', and facilitating the system to suppress high-frequency interference or meet the multi-frequency coexistence requirement.