171 results about "Return loss" patented technology

The invention relates to the technical field of optical communication equipment testing, in particular to an integrated optical module multi-parameter testing system and method.The method comprises the steps that a multi-channel parallel testing unit synchronously collects light spot morphology, divergence angles, insertion loss and return loss space and transmission characteristic parameters through a transmission light path and a reflection light path; the parameter collaborative analysis module performs nonlinear correlation analysis and dynamic performance threshold evaluation based on a cross-dimension correlation model; the intelligent calibration engine dynamically adjusts the test benchmark and compensation parameters according to the environment temperature and the equipment aging attenuation model; the fault diagnosis and prediction unit identifies potential defect types of the collimator, constructs a performance degradation prediction model in combination with a working state and environmental stress, and predicts a performance evolution trend according to test data; and the test report generation module automatically generates a standardized and customized dual-mode test report, a quality grade label and a performance optimization suggestion according to the prediction result and the diagnosis conclusion. Therefore, the problems of poor test precision, low test efficiency and the like in the prior art are solved.

The utility model relates to the technical field of optical communication, in particular to a waveguide terminator and an optical module.The waveguide terminator comprises an optical absorber and a transmission waveguide which are stacked and arranged at intervals; wherein the transmission waveguide comprises a first waveguide section and a second waveguide section, and the second waveguide section is located in a projection area of the light absorber and used for diverging a light field. One end of the first waveguide section is connected with the second waveguide section, and the other end of the first waveguide section extends out of the projection area of the light absorber and is used for transmitting externally input incident light to the second waveguide section. And the included angle between the tangent line of the first waveguide section at the boundary of the projection area of the light absorber and the boundary is smaller than 90 degrees, so that a small amount of light reflected at the boundary of which the refractive index suddenly changes can enter the cladding to be dissipated, additional return loss is avoided as far as possible, and the return loss of the optical chip can be further reduced.

The invention relates to the technical field of optical fiber connector connection monitoring, in particular to an AI-based optical fiber connector connection reliability monitoring method and system, and the method comprises the steps: constructing a multi-mode monitoring data source through synchronously collecting time sequence parameters including optical power, insertion loss, return loss and other physical quantities and a connector end face image, the image is subjected to feature mapping through the convolutional neural network, spatial features of pollution, scratches and alignment deviation are automatically extracted, manual inspection is replaced, and the recognition efficiency and objectivity are improved. Time sequence parameters are input into the modeling performance evolution trend of the long-short-term memory network, and weak dynamic characteristics such as chronic degradation are effectively captured. And through fusing image space features and parameter trend features, strengthening key factor characterization, and outputting a reliability determination result of the connector through a residual error classification network, accurate classification of normal, to-be-maintained and fault states is realized, traceability alarm information can be generated, and intelligent monitoring and early warning of the operation state of the connector are realized.

The invention discloses a 16-in-one high-power combiner working in a radio frequency band, and belongs to the technical field of fusion radio frequency heating. The invention comprises a coaxial input hard feeder line, a radial transmission line (RTL), a gradient impedance matching coaxial line and a coaxial output hard feeder line. The physical size is designed through theoretical calculation, electromagnetic field distribution is optimized through simulation, 16 radio-frequency signal input ports are designed through radial symmetric topology, a radial transmission line serves as a main synthesis path of radio-frequency signal source power, the power input by the 16 radio-frequency signal source ports is subjected to one-step efficient synthesis in the center of the radial transmission line, and the radio-frequency signal source power is obtained. And the 50-ohm characteristic impedance standard output of the synthesized radio frequency signal power is realized through an impedance matching technology. The sixteen-in-one power combiner designed by the invention has the characteristics of high synthesis efficiency, symmetrical structure, good amplitude and phase consistency, high isolation, low return loss, low reflection loss, simple design structure, easiness in manufacturing and the like.

The invention relates to the technical field of radio frequency processing, discloses a radio frequency chip fan-out packaging design method based on machine learning optimization, and aims at the design of high-speed packaged high-frequency pins. A high-frequency pin GSG structure design process is decoupled into a mapping problem of an RDL signal line length L, a signal line and ground line spacing S, a signal involute angle alpha and pin characteristic impedance, loss and return loss electrical performance. And by taking the solving process of the positive problem as a training environment, reversely solving a specific combination of GSG structure design size parameters meeting different design demand responses. Meanwhile, in the face of small-batch radio frequency chip product design of customized, small-crowd or technical exploration stage scenes with few products and various forms, a non-ergodic sample collection and later-stage small-amount adjustment mode is adopted, and the situation that ergodic simulation covers all parameter ranges to generate models and simulations in batches is avoided; and the earlier-stage investment time and computing power cost are higher than the small-batch production income.

The invention discloses a phase and amplitude modulation noise iterative compensation method and system for an optical frequency domain reflectometer, and belongs to the technical field of optical measurement and sensing, and the phase and amplitude modulation noise iterative compensation method for the optical frequency domain reflectometer comprises the steps: collecting an auxiliary interferometer signal and a measured device interference signal; extracting phase information of the auxiliary interferometer signal, and obtaining amplitude modulation noise information based on the phase information; carrying out phase noise suppression on the interference signal of the tested device, then carrying out Fourier transform to obtain a frequency spectrum, and calculating background noise and a signal peak value; generating an amplitude-modulated noise signal based on the signal peak position and the amplitude-modulated noise information; subtracting the amplitude modulation noise signal from the frequency spectrum to obtain a compensated signal; when the signal-to-noise ratio of the signal peak value to the background noise is lower than a set threshold value, iteration is stopped, and phase and amplitude modulation noise iteration compensation is completed. According to the invention, the system compensation cost can be saved, the compensation precision is improved, the system complexity is reduced, the robustness is improved, and the return loss measurement precision is improved.

The invention relates to an adjustable gain slope compensator. The invention discloses an adjustable gain slope compensator and a method of use. In one aspect, a compensator having a plurality of switchably engaged stages may be positioned in a signal path. The stages selectively switch into or out of the signal path to achieve a desired gain slope compensation to counteract over-amplification in the signal path. In other aspects, the compensator can be dynamically adjusted. In other aspects, the stages may be fully bypassed in order to avoid adding undesirable attenuation to the signal path. The ability to digitally control the compensator allows greater control to provide specific slope values while providing improved return loss and improved bandwidth characteristics.

The application discloses an optical link test method and device based on optical frequency domain reflection, which comprises the following steps: measuring echo optical signals of an optical link in an initial state by using a frequency domain reflectometer to obtain a first signal; measuring the echo optical signals of the optical link after changing the function state of the optical link again by using the frequency domain reflectometer to obtain a second signal; performing fast Fourier transform on the measured first signal and second signal respectively to obtain corresponding frequency domain signals and a distance-power relationship curve; converting the same frequency band in the two frequency domain signals into time domain signals by sliding window interception; performing cross-correlation operation on the time domain signals of the two groups of signals to obtain Rayleigh scattering frequency shift; and obtaining a distance-power distribution curve by calculation in combination with a coefficient. The application can realize fast and accurate measurement and calibration of optical field amplitude and phase parameters of an integrated system from a device level to a link level, and efficiently measure return loss, insertion loss, spectrum, delay and other parameters of an optical link on a chip.

An antenna system formed by one or more layers of a Printed Circuit Board (PCB). The antenna system includes a first antenna element configured to resonate in a first frequency band centered at about 5.4 GHz and a second antenna element configured to resonate in a second frequency band centered at about 2.4 GHz. The first antenna element and the second antenna element fit within a rectangular area of less than about 100 square millimeters on the PCB. The first antenna element has a bandwidth of at least 2 GHz and the second antenna element has a bandwidth of at least 100 MHz, wherein the bandwidth is defined as having less than a −10 dB return loss within the band. The first antenna element and the second antenna element may be formed on a common conductive layer of a PCB.

The invention relates to the technical field of resonators, in particular to a resonator parameter analysis method and system based on artificial intelligence, and the method comprises the steps: generating an ideal coupling matrix of a target resonator according to the center frequency, the passband bandwidth and the in-passband return loss; acquiring a corresponding relationship among an external quality factor, a coupling coefficient between resonant cavities, a coupling window width and a resonant cavity length through electromagnetic simulation or theoretical calculation, constructing a training data set, and training a regression model to predict the coupling window width; obtaining an external quality factor and a coupling coefficient of a target frequency band by utilizing baseband-passband transformation, solving the width of each coupling window through a prediction model, calculating the length of a resonant cavity by combining interpolation and scale transformation to form an initial size, establishing a three-dimensional simulation model to extract a coupling matrix, and iteratively correcting the length of the resonant cavity according to diagonal elements, so as to obtain an initial size; and obtaining a final physical size meeting the index. According to the method, the problems that an existing resonator design and parameter analysis process depends on experience, the number of simulation iterations is large, and the parameter reverse solving efficiency is low can be solved.

The invention relates to the technical field of wireless communication, and provides a differential matching structure which comprises a first metal layer, a second metal layer, a third metal layer and a capacitor, a first coupling coil is integrated on the second metal layer, a second coupling coil and a third coupling coil are respectively integrated on the first metal layer, and the second coupling coil and the third coupling coil are positioned on the same side of the first metal layer; the third metal layer is used for grounding; the first end of the first coupling coil is used for accessing a radio frequency signal, the second end of the first coupling coil is grounded after being connected with a capacitor in series, the first end of the second coupling coil and the first end of the third coupling coil are connected and jointly connected to the third metal layer, and the second end of the second coupling coil is used for outputting the radio frequency signal; the second end of the third coupling coil is used for outputting a radio frequency signal; the first coupling coil is coupled with the second coupling coil and the third coupling coil. According to the invention, the return loss is small, and the broadband matching effect is good.

This invention provides a partial discharge detection method based on the insertion depth constraint of an ultra-high frequency (UHF) sensor. The method includes: obtaining the physical parameters of an external UHF sensor; detecting the return loss curve of the external UHF sensor in a laboratory environment using a GTEM chamber; calculating the minimum insertion depth of the external UHF sensor at the joint based on the physical parameters of the transformer equipment; calculating the maximum allowable insertion depth of the external UHF sensor based on the internal structural dimensions and insulation safety requirements of the transformer; determining the effective insertion depth range of the external UHF sensor; and measuring the partial discharge signal of the transformer. This invention utilizes a formula to calculate the reasonable insertion depth range of the external UHF sensor at the transformer tank joint, thereby solving the problems of installation depth dependence on experience and poor detection consistency in existing technologies.

The utility model relates to a filter circuit, a dielectric filter and a duplexer, and the filter circuit comprises a signal input end which is used for inputting a signal; the signal output end is used for outputting a signal; the resonance unit comprises a plurality of resonance circuits which are sequentially arranged between the signal input end and the signal output end in parallel; the coupling inductor unit is arranged between the signal input end and the grounding end and between the signal output end and the grounding end, and the coupling capacitor unit is arranged between the signal input end and the first resonance circuit and between the signal output end and the last resonance circuit. According to the utility model, the problem of large return loss in an ultra-wide passband can be solved, standing waves are effectively improved, the working efficiency of the filter is improved, and the communication effect is improved. The dielectric filter is connected with the grounding silver layer on the outer surface of the ceramic substrate through leading out a first connecting line and a second connecting line from the input port and the output port respectively, and plays a role of equivalent inductance.

The invention discloses a powerful sealing optical cable connector box, belongs to the technical field of optical cable connector boxes, and solves the problem that return loss and insertion loss are slowly increased due to the fact that pollutants separated out by aging of a sealing material of the optical cable connector box form an invisible thin film on the end face of an optical fiber in a backbone network outdoor environment running for a long time. Comprising a connector box shell and a pollutant film monitoring circuit, the pollutant film monitoring circuit comprises a communication and power supply unit, a signal acquisition and processing unit, an acoustic sensing and reading unit and an ultrasonic excitation unit, and the acoustic sensing and reading unit and the ultrasonic excitation unit are arranged in the connector box shell. The state of the pollutant film is monitored in real time by actively exciting ultrasonic waves and receiving optical signals modulated by the pollutant film, and key parameters such as film thickness and degradation trend are wirelessly transmitted to a remote monitoring center after internal processing and analysis.

This utility model discloses an electro-optic modulator and an optical communication system. The electro-optic modulator includes: a housing, a cover plate, a modulator chip, an optical input port, an optical output port, an RF signal input, and an internal component. The housing has a cavity and an opening, and the cover plate is used to seal the opening. The modulator chip is disposed within the cavity. The optical input port and the optical output port are both connected to the modulator chip. The RF signal input is connected to the modulator chip. The internal component is disposed within the cavity and connected to the housing. The modulator chip is disposed between the housing and the internal component. By placing the internal component within the cavity of the electro-optic modulator housing and placing the modulator chip between the housing and the internal component, the space around the modulator chip can be significantly reduced, signal resonance can be reduced, return loss can be lowered, and the bandwidth of the electro-optic modulator can be increased.

The utility model provides an optical attenuator capable of reducing on-chip light return loss, which comprises a chip substrate 1, a laser chip 2 and a double-arm waveguide structure 3, the double-arm waveguide structure 3 is arranged on the chip substrate 1, one end of the double-arm waveguide structure 3 is coupled with the laser chip 2, and the other end of the double-arm waveguide structure 3 is coupled with the laser chip 2. The other end of the double-arm waveguide structure 3 extends to the output end face 11 of the chip substrate 1. A preset angle is formed between the output end face 11 of the chip substrate 1 and the extension direction of the double-arm waveguide structure 3, and the preset angle is larger than 90 degrees. The output end face 11 of the chip substrate 1 is prevented from forming a 90-degree angle with the extension direction of the double-arm waveguide structure 3, so that the return light reflected back along the original light path after the output signal is reflected by the output end face 11 is reduced, the loss caused by the return light is further reduced, and the transmission quality of the light signal is improved.

The application discloses a compact cross orthogonal scanning multilayer millimeter wave multi-beam array antenna, which comprises a two-port common-cavity Roofman lens feeding network structure and a common-aperture antenna layer, the two-port common-cavity Roofman lens feeding network structure is located at the bottom layer, and the common-aperture antenna layer is located above the common-cavity Roofman lens feeding network structure; the common-aperture antenna layer comprises a slot antenna layer and a patch antenna layer, the slot antenna layer is located at the bottom layer, and the patch antenna layer is located above the slot antenna layer. The application reduces the echo loss of each port, reduces the reflection of incident waves at the edge port, increases the isolation between the ports and between the two sub-lenses, and improves the working efficiency.

The utility model discloses an asymmetric coupling type double-cage short-wave antenna device, and belongs to the technical field of radio short-wave communication. The antenna device comprises a self-supporting tower assembly, a coupling lower cage antenna surface assembly, a direct-feed lower cage antenna surface assembly, a distribution box assembly, a feed end insulator assembly, a direct-feed upper cage antenna surface assembly and a main lightning rod assembly. The asymmetric coupling type double-cage short-wave antenna device provided by the utility model has the characteristics of wider working bandwidth and low elevation radiation, and the antenna surface and the self-supporting tower assembly are designed in an integrated conformal manner, so that the influence of performance index reduction caused by the fact that the self-supporting tower assembly passes through the antenna surface is eliminated; the device not only can cover an ultra-wideband short-wave communication frequency band of nearly four times of frequency, but also can realize excellent performance of low return loss, high gain, low radiation elevation angle and omnidirectional radiation.

The invention belongs to the technical field of fault monitoring, and discloses a high-reliability MT ferrule optical fiber connection monitoring system and a fault early warning method. Comprising the steps of collecting contact force distribution data of an MT insertion core and performing data cleaning to obtain an original contact force distribution data set; performing memory effect identification, and constructing an effect residual label to mark the original contact force distribution data set to obtain a marked contact force distribution data set; performing local spectrum decomposition, and outputting a spectrum characteristic frequency cluster; offset correction is carried out, and a corrected feature cluster is output; resonance mode distinguishing is carried out, mode marking is carried out on the corrected feature cluster based on a distinguishing result, and a mode distinguishing feature cluster is obtained; a return loss change curve is collected, and a degradation characteristic space is constructed; carrying out feature sub-region division to obtain degradation mode sub-regions; performing early warning evaluation, and outputting an early warning signal; and the accuracy of monitoring the optical fiber connection state and the reliability of early warning are improved.

The application relates to a kind of foldable band-pass filters based on polyimide flexible substrate.The filter adopts coplanar waveguide structure, and is prepared using self-assembly technology.It is tested that the filter center frequency is 2.5 GHz, the relative bandwidth is 15.9%, the minimum insertion loss is 0.71 dB, and the in-band return loss is greater than 20 dB.The performance of the filter is basically consistent in flat, curved and folded states.The flexible filter prepared using the self-assembly technology is expected to become one of the components of future flexible communication systems.

The invention discloses a frequency multiplier circuit based on a carbon nano tube Schottky diode. The frequency multiplier circuit comprises a carbon nano tube Schottky diode device, a fundamental 1 / 4 wavelength-based grounding transmission line at an input end, a second harmonic 1 / 4 wavelength-based open circuit transmission line at an output end, an input impedance matching network and an output impedance matching network. The carbon nanotube Schottky diode is located between the 1 / 4 wavelength grounding transmission line at the input end and the 1 / 4 wavelength open-circuit line at the output end; the input impedance matching network is positioned in front of the 1 / 4 wavelength grounding transmission line at the input end; and the output impedance matching network is positioned behind the 1 / 4 wavelength open-circuit line of the output end. According to the invention, through the process verification of the frequency multiplication circuit of the carbon nanotube device, the return loss under better fundamental wave and multiple frequency and lower frequency multiplication conversion loss are realized, and the frequency multiplication efficiency of the Schottky diode device is greatly improved.

Disclosed in the present invention is a polarity, insertion loss and return loss tester for a multi-core optical fiber, the tester comprising an integrating sphere, wherein the integrating sphere has an incident light channel, the incident light channel comprising an incidence end, an integrating sphere cavity and a receiving end, which are sequentially in communication with each other; the integrating sphere is further provided with a reflected light channel in communication with the incident light channel, a lens assembly and an imaging device being provided in the reflected light channel; a semi-transparent and semi-reflective reflector is fixedly arranged in the incident light channel, or a movable reflective mirror is provided in the incident light channel; and incident light is reflected by the reflective mirror or the semi-transparent and semi-reflective reflector, and is then converged by the lens assembly onto the imaging device for imaging. In the present invention, return loss testing, insertion loss testing, and polarity testing of a winding-free multi-core optical fiber patch cord are carried out on one apparatus, such that the cost is reduced, and the efficiency is improved. Moreover, the reliability and accuracy of the measurement of an insertion loss value and a return loss value are also ensured on the premise of improving efficiency.

The invention discloses a millimeter wave ultra-wideband substrate integrated coaxial line antenna array based on a laminated metasurface. The ultra-wideband antenna array comprises a coplanar waveguide-to-substrate integrated coaxial line switching structure, a one-to-eight power divider based on a substrate integrated coaxial line structure, a butterfly coupling slot and a laminated metasurface antenna, after being fed in by the coplanar waveguide, energy is transmitted to the substrate integrated coaxial line power divider through the blind hole structure, and is uniformly distributed to eight channels in the substrate integrated coaxial line power divider; and then, the energy is coupled and fed to the laminated metasurface antenna through the coupling slot. The antenna can stably work in the frequency range of 15.84 GHz-49.15 GHz, the return loss (S11) is always lower than 10 dB, and the corresponding relative bandwidth is 102.5%. In a target working frequency band, the maximum peak gain of the antenna can reach 18.58 dBi, and the antenna has excellent ultra-wideband characteristics and good radiation performance.

An electronic system having a mounting substrate with a plurality of layers. The mounting substrate combines an upper shield structure and a lower shield structure to form an interlocking shielding structure to reduces crosstalk interference and improve return loss and insertion loss for high-speed serial communication circuits. The upper shield structure and the lower shield structure have a series of grounded reference shields that reduce unwanted electrical signal interferences.

A thermally adaptive antenna system having an antenna structure, an EM) power signal, a DC power signal, an impedance tuner, a temperature sensor in the antenna, a DC-DC conversion component, and a microcontroller. The microcontroller provides a tuning command to the impedance tuner, causing the impedance tuner to compensate for an impedance change in the antenna due to a temperature change in the antenna. An environmentally adaptive antenna system has an antenna structure, an EM power signal, a DC power signal, an EM power splitter, a directional coupler, a reference receiver, a measurement receiver, an impedance tuner, and a controller. The controller calculates antenna impedance change based on observed changes in return loss, calculates a corresponding correction to the antenna impedance, and sends a command to the impedance tuner to implement the correction to the antenna impedance.

This utility model belongs to the field of filters, specifically a coaxial-to-waveguide filter, including a cavity with a waveguide port on the inner side. A coaxial connector is bolted to the top side of the waveguide port. Multiple resonant cavities are formed inside the cavity, and a coupling grounding post is installed inside the cavity through the resonant cavities. A coupling conductor is fixed between the waveguide port and one of the resonant cavities through a supporting insulating medium. One end of the coupling conductor is soldered to the coupling grounding post in the corresponding resonant cavity, and the other end extends into the waveguide port, realizing bidirectional coupling transmission of electromagnetic waves. This utility model introduces cross-coupling technology inside the filter, which significantly improves the out-of-band suppression compared to relying on natural attenuation, reduces the number of resonant cavities required to achieve the same suppression, thereby effectively reducing the product size and also reducing the filter insertion loss. This device achieves low port return loss through high out-of-band suppression.

The utility model discloses an optical structure capable of increasing return loss, which comprises a lens body, an optical fiber and a PD chip, the rear side of the lens body is provided with a fixing port, the main body part of the optical fiber is fixed in the fixing port, the front side wall of the fixing port is provided with an optical fiber jack, the front end of the optical fiber is inserted in the optical fiber jack, and the PD chip is arranged in the optical fiber jack. The lens body comprises a top opening, the bottom of the top opening is provided with an inclined reflecting surface, the bottom of the lens body is provided with a focusing lens, the PD chip is arranged below the focusing lens, the PD chip and the focusing lens are mutually aligned, an inclined end surface is formed at the front end of the optical fiber, and an inner connecting inclined surface is formed at the bottom of the optical fiber jack. And an optical signal transmitted in the optical fiber passes through the inclined end surface, then is emitted to the inclined reflecting surface, is reflected to the focusing lens through the inclined reflecting surface, and is focused on the PD chip through the focusing lens. Based on the structure, return loss can be increased, processing is easy, the overall structure is simpler, and application requirements are well met.

The invention provides a coaxial connector and microwave communication equipment, relates to the technical field of satellite communication, and solves the problem that microwave transmission between different transmission media is poor in reliability and is difficult to apply to a high-frequency scene in the prior art. The coaxial connector of the scheme can complete conversion of electromagnetic wave propagation modes of radio frequency signals through different media and connection structures, thereby realizing transmission of the radio frequency signals from coaxial to microstrip or from microstrip to coaxial, and the coaxial connector is low in insertion loss and good in return loss effect, and can be effectively applied to a microwave frequency band.

The invention relates to the field of mechanical engineering, and discloses a processing design method based on a diamond cutter for optical fiber cutting. The method comprises the following steps: acquiring three-dimensional shapes and optical performance indexes of optical fiber end surfaces cut by a diamond cutter with different cutting edge parameters; microcosmic geometrical characteristics such as cutting edge curvature gradient, crystal orientation, collapse density and surface power spectrum density are extracted; constructing a physical interpretable neural network model embedded with fracture mechanics and optical waveguide constraint; reversely solving a cutting edge parameter set meeting the target optical performance; and an ultra-precision machining path is generated, and the single-point diamond lathe is controlled to machine the diamond cutter in a customized mode. Through closed-loop optimization and online fine tuning, the end face reflectivity stability and mode field consistency are improved, the return loss standard deviation is reduced, and the high-speed optical communication requirement is met.

The invention relates to a simulation method for automatically optimizing a bump wiring structure. The method comprises the following steps of: drawing a copper sheet on an original wiring, and setting width, height and copper sheet spacing variables; copying the copper sheets according to the distance between the copper sheets along the wiring direction to form an array; setting a return loss threshold value by taking the return loss under the fundamental frequency as an optimization target; automatically adjusting a plurality of variables through an optimization algorithm, and obtaining a parameter combination of the width, the height and the copper sheet spacing meeting the return loss threshold value; and constructing a salient point routing structure model according to the parameter combination. According to the method, the width, height and spacing parameterization of the salient point copper sheet are set as variables, and automatic iterative optimization is carried out by taking return loss under DDR signal fundamental frequency as a target in combination with an optimization algorithm, so that the problem of low efficiency of manual parameter debugging in the prior art is effectively solved; based on a mode of dynamically setting a return loss threshold value by a DDR signal fundamental frequency, a fundamental frequency value and an optimization target can be synchronously adjusted, and different DDR rate scenes can be naturally adapted.