16results about How to "Reduce mutual coupling" patented technology

The invention discloses a method for measuring the power frequency phasor of an urban substation, and the method comprises the following steps: S1, building a mathematical model of a to-be-analyzed component in a power supply system of the urban substation, and inputting a to-be-measured signal component into the mathematical model; s2, fitting the power frequency phasor parameters by using linear Bessel interpolation to obtain a fundamental frequency, an amplitude and a phase; s3, compensating a frequency spectrum negative image through an iteration process by using a fitting result in the S2, and reducing the frequency spectrum leakage of the negative image; s4, constructing an energy threshold inequality, judging whether the ratio of the energy of the inter-harmonic component to the component of the signal to be detected meets a threshold or not according to the result of the S3, and if so, directly outputting the result; and if not, repeating the steps S2-S4 until the threshold value is met.

The present invention discloses a compact high-isolation dual-frequency dual-polarization filtering antenna, comprising a reflective floor, a low-pass filter patch antenna unit and a high-pass filter dipole antenna unit, wherein the low-pass filter patch antenna unit comprises a first layer of feed patches and a second layer of parasitic patches, wherein the second layer of parasitic patches is located above the first layer of feed patches, the first layer of feed patches is arranged above the reflective floor, and square gaps are provided between the first layer of feed patches and the second layer of parasitic patches; the high-pass filter dipole antenna unit is nested in the middle of the low-pass filter patch antenna, and the centers of the two coincide; the high-pass filter dipole antenna unit comprises two pairs of dipole arms and a pair of baluns, wherein the two pairs of dipole arms are located above the second layer of parasitic patch antennas, and the baluns are vertically inserted into the gaps between the two layers of patch antennas and connected to the reflective floor. The present invention overcomes the problem of strong coupling when dual-band antennas are nested together, and realizes the miniaturization and high performance of dual-band antennas.

The embodiment of the invention provides a metasurface-loaded phased-array antenna unit and an antenna array. The metasurface-loaded phased-array antenna unit comprises a driving layer, a radiation layer and a covering layer which are stacked in sequence, the driving layer comprises a first dielectric layer and a driving patch, and the driving patch is printed on the first dielectric layer; the radiation layer comprises a second dielectric layer and a radiation patch, and the radiation patch is printed on the second dielectric layer; the covering layer comprises a third dielectric layer and a plurality of covering patches arranged in an array, the covering patches are printed on the third dielectric layer and comprise opening structures, and the third dielectric layer is exposed at the positions of the opening structures of the covering patches. The efficiency of electromagnetic waves radiated by the covering layer is improved, mutual coupling between two adjacent antenna units is reduced, on one hand, high-gain radiation of the antenna units is improved, and on the other hand, mutual coupling between two adjacent antenna units is reduced.

The invention discloses a parameter online identification method, device and equipment of a permanent magnet synchronous motor and a medium. The method comprises the following steps: determining direct-axis inductance and quadrature-axis inductance of the motor by adopting a pulsating high-frequency injection method; obtaining a first stator resistance and a first permanent magnet flux linkage identified by adopting an offline identification method; on the basis of the direct-axis inductance, the quadrature-axis inductance, the first stator resistance, a pre-established adjustable model and an adaptive rate algorithm, identifying the stator resistance of the motor on line; and on the basis of the direct-axis inductance, the quadrature-axis inductance, the first permanent magnet flux linkage, the identified stator resistance, a pre-established adjustable model and an adaptive rate algorithm, identifying the permanent magnet flux linkage of the motor on line. On-line identification of the inductance of the motor is achieved through a pulsating high-frequency injection method, accurate on-line identification of the stator resistance and the permanent magnet flux linkage in a permanent magnet synchronous motor control system without a temperature sensor is achieved in combination with an off-line identification and self-adaptive algorithm, and the identification accuracy and precision of motor parameters are improved.

The invention provides an antenna assembly and electronic equipment, and relates to the field of communication. The antenna assembly comprises a middle frame which comprises a substrate, a frame and rib positions, and the frame is connected with the edge of the substrate through the rib positions; the first antenna is arranged on the frame; the second antenna is arranged on the frame, and the rib position is located between the first antenna and the second antenna; and one end of the first feeder line is used for being electrically connected with the circuit board, and the other end of the first feeder line penetrates through the rib position and is electrically connected with the feeding point of the second antenna. The rib position is arranged between the first antenna and the second antenna, and the rib position can increase the distance between the first antenna and the second antenna, so that the isolation degree between the first antenna and the second antenna is increased. And the first feeder line is not arranged on the substrate of the middle frame, and the position of the first feeder line is closer to the frame, so that the space occupied by the first feeder line is reduced, the internal structure of the electronic equipment is more compact, and a screen with a larger display area can be conveniently arranged.

The application relates to a satellite communication hetero-frequency hetero-circular polarization common-aperture antenna, belonging to the radio frequency communication field, which comprises a dielectric plate assembly, an antenna radiation unit assembly and a SIW feeding structure assembly; the dielectric plate assembly comprises three layers of dielectric plates and provides support for the whole antenna; the antenna radiation unit assembly comprises one low-frequency antenna radiation unit and four high-frequency antenna radiation units, the low-frequency antenna radiation unit is arranged in the middle of the four high-frequency antenna radiation units, and the four high-frequency antenna radiation units adopt a rotating layout; the SIW feeding structure assembly is used for feeding the low-frequency antenna radiation unit and the high-frequency antenna radiation unit. The application can guarantee the normal work of the high-frequency and low-frequency antenna radiation units in the working frequency bands, and present filtering characteristics in the non-working frequency bands, so that the port isolation between the antenna units of different frequency bands is improved. The filtering effect of the SIW feeding cavity can be adjusted by changing the size of the SIW feeding cavity.

The invention discloses a terahertz defect detection device based on a multiple-input-multiple-output array, and relates to the technical field of testing. The device comprises a portal frame, a transmission table, a defect detection array front end, a microwave signal generation module and a data acquisition and control module, the defect detection array front end is fixed on the portal frame, is connected with the microwave signal generation module and is used for detecting defects of a sample to be detected, and the data acquisition and control module is connected with the transmission table. Comprising a terahertz signal generating array, a terahertz signal receiving array and a transmitting and receiving antenna module, and array elements in the terahertz signal generating array and the terahertz signal receiving array are arranged at equal intervals in a staggered mode; the transmission table is positioned below the front end of the defect detection array and is used for placing a sample to be detected, and the portal frame, the transmission table, the front end of the defect detection array and the microwave signal generation module are respectively connected with the data acquisition and control module. The device disclosed by the invention is high in integration level, high in stability and high in imaging efficiency, and realizes rapid, efficient and nondestructive detection on the defects of the non-metallic material.

The invention provides an ultra-wideband millimeter wave antenna, which belongs to the field of microwave technology and antenna engineering and comprises a horn radiation cavity, a parasitic patch layer, a radiation patch layer and a feed layer which are sequentially stacked from top to bottom, the metalized via hole arrays in the parasitic patch layer, the radiation patch layer and the feed layer respectively define a first cavity, a second cavity and a third cavity; the horn radiation cavity coincides with the central axes of the first cavity, the second cavity and the third cavity. The parasitic patch is arranged on the upper surface of the parasitic patch layer and is positioned right above the center of the first cavity; the radiation patch is arranged on the upper surface of the radiation patch layer and is positioned right above the center of the second cavity; the metal grounding plate is arranged on the lower surface of the feed layer; the band-ground coplanar waveguide transmission line is arranged on the upper surface of the feed layer and is connected to one end of the strip-shaped feed line through the metalized feed via hole, and the other end of the strip-shaped feed line is connected to the radiation patch; an antenna array is also provided. And dual improvement of bandwidth and gain of the millimeter wave antenna is realized.

The application discloses an antenna array configuration method based on dynamic beam coverage and phase iteration correction, and the method comprises the following steps: acquiring current scanning time slot parameters, and setting candidate array constraints; adjusting the scanning time slot parameters to realize a wide beam coverage mode and a narrow beam orientation mode, and mapping the physical angle domain to a regularly sampled far field space domain to obtain a target amplitude; performing phase iteration correction under the condition of maintaining the target amplitude unchanged and a limited aperture constraint to obtain a complex target beam; establishing a sparse port selection model to perform port selection iteration, outputting a final selected port set, calculating a complex excitation weight, and configuring a flow state antenna array according to the final selected port set and the complex excitation weight. The method can realize wide beam coverage, narrow beam scanning and dynamic switching of the two with low calculation complexity, and improves the beam reconstruction precision under the limited aperture.

This invention provides a decoupling structure for a millimeter-wave circularly polarized antenna array and a wireless communication device. The decoupling structure is used to resonate and decouple the millimeter-wave circularly polarized antenna array. The decoupling structure comprises, from top to bottom, an upper decoupling dielectric substrate and a lower decoupling dielectric substrate. An upper metal decoupling structure is disposed on the upper surface of the upper decoupling dielectric substrate, and a lower metal decoupling structure is disposed on the upper surface of the lower decoupling dielectric substrate. The upper metal decoupling structure includes a transverse main trunk and several longitudinal branches; the lower metal decoupling structure includes several longitudinal metal branches, with the lengths of the transverse main trunk, longitudinal branches, and longitudinal metal branches decreasing sequentially. Millimeter-wave circularly polarized antenna arrays are spaced apart at the bottom of the lower decoupling dielectric substrate to form a wireless communication device. The resonant decoupling structure of this invention suppresses port coupling between antenna elements while expanding impedance bandwidth and bandwidth.

The invention discloses an underwater target detection and positioning method and system based on a passive sonar array, and relates to the technical field of underwater acoustic signal processing. Acoustic signals radiated by an underwater target are received and divided into dense subarray data and sparse subarray data; performing a sparse Bayesian learning algorithm on the sparse subarray data, and outputting a high-precision fuzzy value; carrying out azimuth estimation on the dense subarray data in a full-angle range through a dense part to obtain a low-precision unambiguous value; and fusing the high-precision fuzzy value and the low-precision non-fuzzy value through an estimation matching model to obtain an orientation estimation result of the underwater target. According to the method, high-precision azimuth estimation is carried out based on the combination of the ternary co-prime array and the compressed grid sparse Bayesian learning, high-precision (but fuzzy) estimation is carried out by utilizing the sparse part of the TCA array, low-precision (but non-fuzzy) estimation is carried out by utilizing the dense part, and high-precision target azimuth estimation under low operand is realized.

The application discloses an integrated Bluetooth and ultra-wideband antenna structure for communication and accurate positioning, which is designed for simultaneously realizing the Bluetooth and the ultra-wideband antenna in a narrow space, fully utilizes the wavelength characteristics corresponding to the Bluetooth frequency band and the ultra-wideband frequency band, takes the ultra-wideband antenna radiator with shorter wavelength as the excitation source of the Bluetooth antenna radiator in the form of near-field coupling, and excites the Bluetooth radiator. In the working mode, the ultra-wideband radiator and the antenna reference ground form a non-dipole working mode, and the Bluetooth radiator is coupled and excited to be in a dipole working mode, so that the mutual interference between the two radiators is minimized, and the mutual interference between the two antenna frequency bands is reduced to the maximum extent.

This invention discloses a decoupling structure for a dual-polarized MIMO antenna, applied to a four-element MIMO antenna. It includes six dielectric substrates: S1, S2, S3, S4, S5, and S6. Metal structure P4 is attached to substrate S1, metal structure P3 to substrate S2, metal structure P2 to substrate S4, and metal structure P1 to substrate S6. S7 is a cross dielectric substrate, vertically placed directly below the antenna element. A U-shaped feed line P5 is attached to the back of S7, and a rectangular metal sheet P6 is attached to the front. S8 is another cross dielectric substrate, vertically placed between adjacent isolation wall dielectric substrates S9, with a U-shaped metal ring P7 attached to its back. S9 is a metal isolation wall surrounding the cross dielectric substrate S7. M is a metal reflector. The advantages of this invention lie in its innovative decoupling structure and the achievement of high isolation within a wide bandwidth while maintaining a relatively small antenna element spacing.

A phased array radar antenna disclosed by the present invention comprises an antenna reflecting plate, a reflecting plate lining plate, a radio frequency connector, a power dividing feed unit, a sum-difference device module and a radiation array unit, the reflecting plate lining plate is arranged on a first mounting surface of the antenna reflecting plate, the radio frequency connector is arranged on a second mounting surface of the antenna reflecting plate, and the power dividing feed unit is arranged on the second mounting surface of the antenna reflecting plate. The power division feed unit is arranged on the reflecting plate lining plate, the radiation array unit comprises a left radiation array and a right radiation array which are symmetrical in structure and are independently arranged, and each of the left radiation array and the right radiation array comprises a plurality of columns of sub-arrays arranged in the horizontal direction; each column of sub-arrays is composed of a plurality of array element radiation units which are arranged along the vertical direction; and the plurality of array element radiation units in each column of sub-arrays all adopt an integrated structure and are coupled and connected with the sum-difference device module through the power division feed unit. According to the antenna, the gain, the beam pointing precision and the anti-interference capability of the antenna in the C wave band are improved.

The embodiment of the invention provides a semiconductor device and a manufacturing method thereof, and a memory system, and the semiconductor device comprises an active column array which comprises a plurality of columns of active columns and a plurality of rows of active columns; a plurality of gate structures, wherein one gate structure covers a part of side walls of at least one row of active columns; the plurality of isolation structures are positioned between two rows of active columns between two adjacent gate structures, and comprise first isolation structures and second isolation structures; the second isolation structure is close to the row of active columns on the outermost edge of at least one side of the active column array; the first isolation structure is located at one side, far away from the outermost row active column, of the second isolation structure; wherein the first isolation structure and the second isolation structure are made of different materials.

The invention relates to the technical field of wireless communication, and discloses a dual-polarized antenna and a dual-polarized omnidirectional antenna based on a Wi-Fi 6E frequency band, and the dual-polarized antenna comprises a third substrate and N radiation units which are periodically arranged on the third substrate; wherein one side of the third substrate is provided with a metal ground, and the other side of the third substrate is provided with two one-to-N first power dividers; the radiation unit comprises a T-shaped first substrate and a T-shaped second substrate which are perpendicular to each other; one side of the first substrate and one side of the second substrate are provided with a first radiation sheet and a second radiation sheet which are connected, and the other side of the first substrate is provided with an inverted L-shaped first feed arm; the other side of the second substrate is provided with an inverted L-shaped second feed arm. The second radiation sheet is connected with the metal ground; and the first feed arm and the second feed arm are respectively connected with the output ends of the first power dividers. According to the dual-polarized antenna, the consistency of the horizontal polarization direction and the vertical polarization direction can be kept in broadband application such as Wi-Fi 6E, and good polarization cross isolation is ensured on the premise of compact design.