94 results about "Microwave filter" patented technology

The invention discloses an anti-interference microwave electrically tunable filter regulation and control system and method, and particularly relates to the technical field of communication anti-interference, the interference suppression of microwave signals is realized through the following steps: firstly, based on a preset frequency range, monitoring the frequency spectrum change of the microwave signals in real time, and identifying the type and source of interference signals; when the microwave electrically tunable filter is initially tuned, a single-channel strategy is adopted, a preset suppression measure is executed according to interference frequency characteristics, and interference signals are effectively filtered out; finally, a feedback control mechanism is used, the performance of the filter is monitored in the adjusting process, the strategy is dynamically corrected, and the stability and high efficiency of the anti-interference performance are ensured; according to the method, the performance of the microwave filter is evaluated in real time through the environment change characteristic index and the environment complex characteristic index, the positive feedback or negative feedback signal is generated through the fuzzy reasoning model to serve as the basis for adjusting the work of the filter, and the response capacity to the interference environment is improved by adopting a feedback control mechanism; and the high-efficiency anti-interference performance is ensured.

The invention relates to the technical field of tuning data of filters, provides a tuning control method of a distributed microwave filter, and aims to solve the problem of difficulty in nonlinear relation and multivariable convergence between a debugging model and an actual model in a filter tuning process. The method comprises the steps of data preprocessing, spectrum analysis, error correction, tuning model construction and optimization and the like, a target frequency component and an interference frequency component in a signal are identified through a fast Fourier transform algorithm, a tuning model is optimized through a genetic algorithm, an optimal tuning parameter is calculated, and if the performance of a filter does not reach a target, the tuning parameter is calculated. According to the method, the accuracy of filter tuning control is improved, and the adaptability and the stability of the filter are enhanced.

A microwave filter arrangement (100) for quantum computing applications, the filter arrangement (100) comprising a first port (113) and a second port (114). The microwave filter arrangement (100) comprises a main waveguiding structure (110) arranged between the first (113) and second (114) port, where the main waveguiding structure (110) comprises an inner conductor (111) having a circular cross-section that is surrounded by a hollow outer conductor (112) having a rectangular cross-section with two opposed long sides and two opposed short sides. The waveguiding structure (110) comprises a plurality of hollow waveguides (115) extending away from one or both of the long sides of the outer conductor, the hollow waveguides (115) comprising a dielectric material (122) and being terminated by an electromagnetically absorptive material (124).

An embedded PCBA module comprises a ceramic substrate microwave filter and a multi-layer microwave printed board, the multi-layer microwave printed board is provided with a blind groove and board end radio frequency transmission lines, the blind groove is consistent with the ceramic substrate microwave filter in shape and size, the bottom of the blind groove is provided with a grounded copper layer, and the board end radio frequency transmission lines are printed on board surfaces on two sides of the blind groove; the ceramic substrate microwave filter is embedded in the blind groove and is flush with the upper surface of the multi-layer microwave printed board, a ground layer on the bottom surface of the ceramic substrate microwave filter is in contact with the ground of the multi-layer microwave printed board in a fitting manner, and the ceramic substrate microwave filter is provided with a first radio frequency transmission port and a second radio frequency transmission port which extend to the edge of the filter; and the first radio frequency transmission port and the second radio frequency transmission port are respectively connected with adjacent board end radio frequency transmission lines through signal connecting pieces. According to the utility model, parasitic parameters are reduced through a plurality of measures, so that the normal operation of products is ensured.

The invention belongs to the technical field of microwave filter design, and particularly relates to a microstrip filter of a CQ frequency-variable coupling structure and a design method of the microstrip filter. The method comprises the following steps: firstly, according to required filter indexes, such as order, center frequency, bandwidth, return loss and transmission zero position, solving a transverse matrix M of a filter by utilizing a filter comprehensive theory; then performing similarity transformation and scaling transformation on the transverse matrix to eliminate unnecessary coupling terms in the transverse matrix so as to obtain a filter topological structure and a frequency-dependent coupling matrix M'which are easier to implement; a quarter-wavelength short-circuit stepped impedance resonator is selected as a resonance unit of the micro-strip filter simulation model; finally, relevant coupling parameters of the micro-strip filter simulation model are made to approach the theoretical coupling coefficient by adjusting relevant physical structure parameters of the resonator, and then design is completed. By introducing a frequency-dependent coupling mechanism into the structure, the position of a transmission zero point is flexible and controllable, and the spectrum selectivity and the out-of-band rejection capability of the filter can be effectively improved.

The invention provides a reverse design method for a multi-layer frequency selective surface filter based on machine learning, which combines topology modeling and parameter modeling and comprises the following steps of: constructing a multi-layer frequency selective surface microwave filter structure, namely constructing a filter structure comprising a metal resonance patch and key physical parameters; a training data set construction step: constructing a training data set including an input and output data set; and a machine learning model training and reverse design step: training the data set by using a Res-MLP network, inputting a target electromagnetic response on the trained model, fitting a filter structure through the Res-MLP network, and realizing reverse design. According to the method, hybrid modeling is realized by combining topology modeling and parameter modeling, the FSS filter with a specific layer number and structure is deduced according to requirements, the filter design with higher design freedom and application frequency band is realized, and the FSS filter design outside the training frequency band can be realized based on the frequency band offset of the FSS under the low-dispersion or non-dispersion material.

This invention discloses a filter physical perception optimization method based on residual attention and transposed convolution, comprising the following steps: constructing a filter characteristic prediction surrogate model based on residual self-attention mechanism and transposed convolution decoding to establish a nonlinear mapping relationship between filter geometric parameters and electromagnetic response parameters; training the filter characteristic prediction surrogate model using an S-parameter weighted mean square error loss function to obtain a trained filter characteristic prediction surrogate model; and using a physical perception-improved differential evolution algorithm, employing the trained filter characteristic prediction surrogate model as a predictor to find the optimal combination of geometric parameters that satisfies the filter design specifications in the solution space. This method is a filter optimization design method that balances high-precision prediction and high-efficiency optimization. This method can predict the S-parameters of microwave filters more accurately than traditional neural networks, effectively replacing time-consuming full-wave electromagnetic simulation.

The present invention relates to a filter coupling matrix extraction method based on optimization, comprising: obtaining scattering parameter values ​​of a microwave filter with a loaded phase shift; constructing optimization variables and initializing the optimization variables; constructing a weighted objective function according to the optimization variables; obtaining gradient information according to the objective function calculation, optimizing and updating the optimization variables using a Gauss-Newton optimization algorithm according to the gradient information, and extracting the coupling matrix of the microwave filter according to the optimization results of the optimization variables. The filter coupling matrix extraction method based on optimization of the present invention needs to remove the influence of the loaded phase shift, and the extracted coupling matrix has high accuracy and can be used for debugging microwave filters.

The application discloses a kind of based on graph embedding microwave filter fault diagnosis's performance debugging method, first, the admittance parameter feature extraction network of complex convolution coding subnetwork and complex deconvolution decoding subnetwork cascade is built, then combined with the microwave filter structure to be diagnosed and debugged graph convolution inversion network is built, generates admittance parameter training set and scattering parameter training set, finally alternately trains admittance parameter feature extraction network and graph convolution inversion network, carries out fault diagnosis and debugging to microwave filter.The present application is an unsupervised model, which reduces the difficulty of collecting a large number of data sets;And in the process of fault diagnosis and debugging, without any iterative optimization process, a large amount of diagnosis and debugging time can be saved;The model constructed in combination with the physical structure of the filter can be used for fault diagnosis and debugging of microwave filters of any structure, and has higher applicability.

The present invention relates to the field of microwave filters, and discloses a two-layer optimization algorithm applied to the coupling matrix transformation of microwave filters, which abstracts the coupling matrix topological transformation problem into an optimization problem and adopts the idea of ​​hierarchical optimization to solve it; in the first layer optimization, an adaptive differential evolution algorithm is used to solve the optimization problem, and a solution with better performance is searched in a larger optimization space. The adaptive differential evolution algorithm is an optimization algorithm based on swarm intelligence, which can approach the optimal solution through continuous iteration of the swarm. By using this algorithm, a relatively good solution can be found. In the second layer optimization, based on the solution obtained by the first layer optimization, an adaptive quasi-Newton method is used to solve the optimization problem, and a solution with better performance is quickly searched in the local optimization space. The quasi-Newton method is iterated based on gradient information, and only needs to calculate the approximate value of the inverse matrix of the Hessian matrix, so the calculation efficiency is high.

The present invention discloses a fast adaptive filtering circuit device, belonging to the field of electronics, which includes a main branch and a coupling branch; the main branch includes a limiter, a microwave filter, a coupler, a microwave amplifier A, a main branch filtering network and a microwave amplifier B; the coupling branch includes a coupling branch filtering network and a detection circuit; the coupling branch filtering network is located between the main branch coupler and the detection circuit to realize signal screening for the radio frequency signal in the coupling branch; the detection circuit is located after the coupling branch filtering network, receives the strong signal output identified by the coupling branch filtering network, converts it into a detection voltage, compares it with the set external threshold voltage, issues a control signal, and distributes the control signal to the main branch filtering network in the main branch for filtering channel selection. The present invention can achieve fast suppression of strong interference signals, effectively improve the reception ability of narrow pulse signals, and further enhance the adaptability of ultra-wideband receivers to complex environments.

A microwave filter includes a superconductor-to-insulator transition (SIT) layer including a material exhibiting a superconductor-to-insulator transition associated with a superconducting gap frequency. For signals transmitting through the layer, the microwave filter is a low-pass filter in which twice the superconducting gap frequency is a cutoff frequency.

The invention discloses a robust coupling matrix reconfiguration optimization method based on an inverse eigenvalue problem. The method comprises the following steps of: 1, improving an optimization model based on the inverse eigenvalue problem; a second step, improvement of an optimized Levenberg-Marquardt method is carried out, and the Levenberg-Marquardt method is carried out; step 3, an optimization method based on q reduction; the method has the beneficial effects that the method can be suitable for a large-scale and more complex filter topological structure transformation problem, and the robustness of the optimization process is enhanced while the optimization efficiency is improved. Compared with the existing method in a real application example, the research provided by the invention has extremely high optimization success rate and good reliability. Therefore, an efficient comprehensive means is provided for the design of the microwave filter, the efficiency is improved for the subsequent production and debugging of the filter, and a large amount of time is saved.

The application discloses a C-band tuning-free duplexer and belongs to the technical field of microwave filters. The tuning-free duplexer comprises an upper conductor and a lower conductor, and the upper conductor and the lower conductor are buckled one above the other to form a waveguide cavity. The upper conductor is provided with a combining port in the middle of the top, and the lower conductor is provided with a low-frequency input / output port and a high-frequency input / output port at the bottom. The waveguide cavity from the low-frequency input / output port to the combining port constitutes a low-end filter, and the waveguide cavity from the high-frequency input / output port to the combining port constitutes a high-end filter. The main bodies of the high-end filter and the low-end filter are both a plurality of waveguide resonant cavities arranged along a straight line, the middle positions of each waveguide resonant cavity are provided with cavity loading, and adjacent waveguide resonant cavities are connected through inter-cavity coupling. The tuning-free duplexer adopts a symmetrical structure and a center loading mode, realizes tuning-free assembly, has the characteristics of high power bearing capacity, low transmission loss and excellent signal isolation, and is suitable for a C-band communication system.

A method for designing an acoustic microwave filter in accordance with frequency response requirements, comprising: selecting an initial filter circuit structure comprising a plurality of circuit elements including at least one resonant element and at least one other reactive circuit element; selecting attenuation-free circuit response variables based on the frequency response requirements; selecting a value for each of the circuit elements based on the selected circuit response variables to generate an initial filter circuit design; transforming the at least one resonant element and the at least one other reactive circuit element of the initial filter circuit design into at least one acoustic resonator model to generate an acoustic filter circuit design; adding parasitic effects to the acoustic filter circuit design to generate a pre-optimized filter circuit design;Optimizing the pre-optimized filter circuit design to produce a final filter circuit design; and building the acoustic microwave filter based on the final filter circuit design.

The present invention discloses a rotary microwave filter power divider, which resonates with TM 010 The choke slot loaded circular waveguide cavity of the mode and the circular symmetric loaded circular waveguide cavity of the coaxial probe are coupled through a common metal ring. 010 The circular symmetry of the mode field, the external quality factor control of the output coaxial probe and the coupled equal-amplitude and in-phase field, and the internal field continuity provided by the choke slot simultaneously achieve the functions of filtering, power division and stable output signal during rotation, forming a rotary filter power divider with the characteristics of low cost, small size, low loss and simple structure.

The application discloses a double-rotation-in-rotation-out structure microstrip resonator and microwave filter, and relates to the technical field of microwave communication. The opening end of the first rotation-in-rotation-out structure and the opening end of the second rotation-in-rotation-out structure are opposite and diagonally symmetrical. The first rotation-in-rotation-out structure and the second rotation-in-rotation-out structure are both double-line structures, which are wound in a character-shaped manner at a set initial position, and when wound to a preset terminal position, the inner line is elongated until a U-shaped structure surrounds the part wound in the character-shaped manner. The outer lines of the two double-line structures are connected through a first microstrip line. The double-line structure is composed of two parallel microstrip lines, and the two parallel microstrip lines are connected through a preset microstrip line at the corresponding set initial position. The application aims to solve the problem that it is difficult to achieve extremely weak coupling of the resonator at a small interval, and improve the stability of the coupling.

A superconducting device is described wherein the device comprises a substrate; a capacitor structure (604) and a superconducting inductor structure (602) disposed on the substrate, the capacitor structure an the superconducting inductor structure forming a superconducting microwave filter structure, in particular a low-pass filter, the superconducting inductor structure including a plurality of nanowires of a superconducting material, each of the plurality of nanowires being galvanically connected to one of a plurality of capacitor electrodes (608) forming the capacitor structure, wherein the cross-sectional dimensions of the plurality of nanowires are selected such that the kinetic inductance of each of the one or more nanowires is larger, preferably substantially larger, than the geometrical inductance of the nanowire.

The invention discloses a BSSIR-based miniaturized microwave filter with a bandwidth adjustable structure. The BSSIR-based miniaturized microwave filter comprises two metal layers and a dielectric layer, the dielectric layer is arranged between the two metal layers; the lower metal layer is a grounding layer and comprises a grounding metal bottom plate and a lower metalized through hole, and the lower metalized through hole is formed in the center of the grounding metal bottom plate; the upper metal layer is a structural layer and specifically comprises a plurality of BSSIRs, a metal ring, an upper metalized through hole and a plurality of feed ports. The invention provides a miniaturized microwave filter based on an SIR with a bandwidth adjustable structure, which can realize high frequency selectivity and miniaturization of the filter, and can also realize bandwidth adjustability of the filter. According to the scheme of the filter, the low-impedance part of the SIR is cut into several parts, and then the switched capacitor is welded to the disconnected position; and bandwidth adjustment is realized by switching on and switching off the switch variable capacitor.

The utility model discloses a kind of multilayer surface-mounted filters, it is related to microwave filter technical field, the utility model is replaced metal cavity / LTCC by adopting compression process multilayer substrate, avoid cavity bulky structure, overcome the problem of LTCC sintering deformation, realize the size is reduced substantially, simultaneously, by interlayer coupling resonance unit in vertical direction is partially overlapped, it can promote Q value to traditional single layer microstrip 2 times or more, and full-wrapped metal shell can replace traditional partial ground layer, reduce stray radiation leakage, can break through volume, loss, suppression, temperature drift and power and multiple bottleneck, to meet the use demand of filter in harsh environment.

The invention discloses a microwave filter coupling matrix reconstruction method based on Householder transformation, and the method specifically comprises the steps: introducing a brand-new global view strategy: enabling a Householder vector in each step to be aligned with a feature vector of a matrix related to overall transformation, and achieving the global optimal control of a transformation path based on a Rayleigh quotient iteration theory; while an optimization route is reserved, an accurate and efficient gradient calculation method is developed, so that optimization can be almost completed in real time. Meanwhile, by means of introduction of parallel computing, the search speed of feasible solutions is greatly increased, and the calculation performance is far better than that of a traditional method; an advanced constraint processing mechanism is introduced through an enhanced Lagrange method, engineering constraints are directly embedded into a transformation process for the first time, and the fatal defect that a traditional method lacks constraint control is overcome.

The application discloses a coaxial cavity resonator and an electrically tunable band-pass filter, and belongs to the technical field of microwave filters. The coaxial cavity resonator comprises an outer cavity, an inner conductor, a tuning rod and a dielectric support. The inner conductor comprises a fixed part and a sliding part. The fixed part is fixed at the central position of the outer cavity through the dielectric support. The sliding part of the inner conductor is in good elastic conductive contact with the fixed part through a spring leaf. The sliding part of the inner conductor can linearly reciprocate inside the fixed part of the inner conductor. The transmission part of the inner conductor is fixed with the tuning rod through a thread. The tuning rod is a non-metal solid cylinder. The electrically tunable band-pass filter is composed of multiple coaxial cavity resonators, input and output structures and a coupling structure between the electrically tunable resonators. The electrically tunable band-pass filter has a wide tuning stroke, an unchanged absolute bandwidth and strong anti-interference capability.

The invention discloses an in-phase locking device and method of an ultra-low phase noise dual-frequency photo-generated microwave source. The device comprises an active optical loop, a radio frequency gain link and a frequency division and phase synchronization control unit. The active optical loop comprises an optical amplifier, an optical isolator, an optical filtering unit, an optical delay unit and an electro-optical modulation unit, and is used for generating high-coherence optical signals. The radio frequency gain link comprises an optical detector, a microwave filter, a radio frequency amplifier and a phase regulation and control unit, and is used for converting an optical signal into a high-frequency microwave signal. And the frequency division and phase synchronization control unit performs frequency division on the high-frequency microwave signal, and locks the phase of the low-frequency microwave signal obtained by frequency division to the high-frequency microwave signal through a phase-locked loop formed by the frequency mixer, the reference source and the servo feedback unit. According to the invention, the high-Q-value optical delay unit is utilized to suppress phase noise, and through an integrated phase locking design, phase-synchronous dual-frequency and ultra-low phase noise microwave signal output is realized, and the problem that phases of two independent microwave sources are not synchronous is solved.

The utility model discloses a structure for solving synchronous tuning of a coaxial mechanically tuned filter, which belongs to the technical field of microwave filters and comprises five parallel coaxial cavities, tuning rods in the coaxial cavities, double-coupling hole structures between adjacent cavities and input and output structures. The cavity bodies of the five parallel-row coaxial cavities are the same in size and are symmetrically distributed, the number of the cavity bodies can be N, and the coaxial cavity bodies can be arranged in a parallel-row mode or other flexible modes. The tuning rods in the coaxial cavity are symmetrically distributed, the diameters of the tuning rods are different, the middle of the tuning rods is thick, and the two sides of the tuning rods are thin. The double-coupling junction hole structure between the adjacent cavities is formed by forming two regular coupling holes in the common wall of the adjacent cavities, and the coupling between the whole cavities is symmetrically distributed. By changing the diameter of the resonance rod in the coaxial cavity, the problem of asynchronous high-frequency mechanical tuning is solved, and meanwhile, the bandwidth difference in the whole tuning range can be reduced by adopting the double coupling holes.

The invention discloses a fast self-adaptive filter circuit device, which belongs to the field of electronics and comprises a main branch and a coupling branch. The main branch comprises an amplitude limiter, a microwave filter, a coupler, a microwave amplifier A, a main branch filter network and a microwave amplifier B; the coupling branch comprises a coupling branch filter network and a detection circuit; the coupling branch filter network is located between the main branch coupler and the detection circuit and is used for screening radio frequency signals in the coupling branch; and the detection circuit is positioned behind the coupling branch filter network, receives the strong signal identified by the coupling branch filter network, outputs the strong signal, converts the strong signal into a detection voltage, compares the detection voltage with a set external threshold voltage, issues a control signal, and distributes the control signal to the main branch filter network in the main branch for filter channel selection. According to the invention, rapid suppression of strong interference signals can be realized, the narrow pulse signal receiving capability is effectively improved, and the adaptability of an ultra-wideband receiver to a complex environment is further improved.

The invention discloses a high-entropy tungstate microwave dielectric ceramic material and a preparation method thereof, and relates to the technical field of microwave dielectric ceramic materials. The preparation method of the high-entropy tungstate microwave dielectric ceramic material comprises the following steps: weighing raw materials and uniformly mixing to form a mixed raw material; mixing the grinding balls, a process control agent and the mixed raw material, carrying out ball milling to obtain a mixed material, drying the mixed material, adding an adhesive, granulating, and pressing to form a green body; and carrying out four-stage heating sintering on the green body, and then carrying out furnace cooling to room temperature to obtain the high-entropy tungstate microwave dielectric ceramic material. Aiming at the condition of high sintering temperature of a tungstate-based ceramic dielectric material, the microwave dielectric ceramic material is prepared by a multi-element solid solution effect method, and the method has the advantages of simplicity and convenience in operation, accuracy in control and high stability, and can be applied to the field of preparation of high-frequency electronic elements such as microwave filters and resonators applied to LTCC (Low Temperature Co-Fired Ceramic).

The application discloses a microwave filter diagnosis and repair inversion method based on a knowledge graph, and the steps are as follows: obtaining full-period unstructured text data of a microwave filter, and constructing an ontology of a microwave filter knowledge graph; preprocessing the unstructured text data to generate a training set and a test set; training an entity extraction model based on a bidirectional long short-term memory network, associating the extracted entities according to the ontology, obtaining knowledge triples, and constructing a microwave filter knowledge graph; fusing the microwave filter knowledge graph with a diagnosis and repair inversion model; and based on the microwave filter knowledge graph, performing diagnosis and repair inversion to realize fault diagnosis, debugging guidance and design. The application improves the utilization rate of accumulated data of the microwave filter, enhances the cooperation of microwave filter design and manufacturing, and improves the design and manufacturing iteration efficiency.

A microwave filter includes a multilayer stack. The multilayer stack includes one or more first-type layers composed of a first superconductor material having a first superconducting critical temperature; and one or more second-type layers composed of a non-superconductor metal or a second superconductor material having a second superconducting critical temperature that is lower than the first superconducting critical temperature. The multilayer stack is configured to behave as a dissipative metal for photons having a frequency above twice a superconducting gap frequency of the multilayer stack and to behave as a superconductor for photons having a frequency below twice the superconducting gap frequency of the multilayer stack.

The utility model provides a silicon-based capacitance microstrip low-pass filter, microwave test equipment and electronic countermeasure equipment, and relates to the technical field of microwave filter design, the silicon-based capacitance microstrip low-pass filter comprises a dielectric plate, the upper surface of the dielectric plate is provided with a microstrip line, the microstrip line is provided with a multi-order microstrip branch, and the multi-order microstrip branch is provided with a micro-strip. Each order of microstrip branch is connected with one end of a silicon-based capacitor chip, and the other end of the silicon-based capacitor chip is grounded. According to the utility model, the filter is constructed by combining the micro-strip branch and the silicon-based capacitor chip, and the silicon-based capacitor chip has the characteristics of high Q value, low loss, high power capacity, low temperature drift and the like, so that the size of the filter can be reduced, and the performance of the filter can be improved.

An optical fiber time transfer device with same fiber and same wave includes: a near-end device, a middle downloading device and a far-end device connected by an optical fiber; the near-end device mainly includes a single fiber bidirectional connector, an f0 related signal generator, an f1 related signal generator, an optical transmitter, an optical receiver, an f1 microwave filter and a signal processing unit; the far-end device mainly includes a single fiber bidirectional connector, an f0 related signal generator, an f1 related signal generator, an optical transmitter, an optical receiver, a f0 microwave filter and a signal processing unit; the middle downloading device includes a 2*2 optical coupler OC, an f0 related signal generator, an f1 related signal generator, an f1 microwave filter, a f0 microwave filter, an optical receiver and a signal processing unit. The device can use the same wavelength of optical carrier in the same optical fiber in different directions for time transfer, ensure the symmetry of bidirectional transmission, and effectively suppress the influence of backscattering.