221 results about "Return loss" patented technology

The invention discloses an orthogonal directional coupler and a microwave system based on a micro-coaxial technology, the orthogonal directional coupler comprises a metal outer conductor, an upper inner conductor and a lower inner conductor, the upper inner conductor and the lower inner conductor are suspended in the metal outer conductor through a periodic medium support loading structure; the upper inner conductor and the lower inner conductor serve as two identical micro coaxial coupling lines to be cascaded, the micro coaxial coupling lines are symmetrical multi-stage impedance stepped couplers, each micro coaxial coupling line is provided with n coupling units, the coupler structure is symmetrical about the center coupling unit, the upper inner conductor and the lower inner conductor are overlapped in the axial direction at the center coupling unit, and the upper inner conductor and the lower inner conductor are overlapped in the axial direction at the center coupling unit. The upper inner conductor and the lower inner conductor extend from the center coupling unit to the two ends, the upper inner conductor and the lower inner conductor deviate from the center to the two sides, and the closer to the coupling units at the two ends, the larger the offset is; the ultra-wideband orthogonal antenna can work in the frequency range of 5 GHz to 100 GHz, the return loss is superior to 15 dB, the phase change is smaller than 5.5 degrees, the directivity is superior to 10 dB, and the ultra-wideband orthogonal antenna can be used for generating ultra-wideband orthogonal signals.

The invention provides a comprehensive shielding signal cable and a manufacturing method thereof.The comprehensive shielding signal cable comprises a cable core and a protective layer wrapping the cable core, and the protective layer sequentially comprises a composite shielding layer and an outer sheath layer from inside to outside; the composite shielding layer comprises an iron-based amorphous nanocrystalline alloy layer, a 3D woven mesh layer and a conductive polymer coating which are sequentially arranged on the outer side of the cable core from inside to outside; through the gradient composite structure of the iron-based amorphous nanocrystalline alloy layer (low-frequency magnetic shielding), the 3D woven mesh layer (medium-frequency electromagnetic shielding) and the conductive polymer coating (high-frequency electric field shielding), the full-band shielding effectiveness is realized for the first time, meanwhile, the return loss is greatly reduced, the electromagnetic transmission performance and reliability of the cable are improved, and the service life of the cable is prolonged. And the structural stability of the cable is improved.

The invention discloses a circuit board printing control method and system based on signal transmission loss. And obtaining a target differential transmission line parameter and a circuit board lamination parameter. And establishing an electromagnetic simulation model, and simulating insertion loss, return loss and impedance discontinuous point distribution. The line width, the line spacing and the interlayer hollowed-out area of the differential transmission line are dynamically adjusted through the reinforcement learning model, the proportion of the line width to the shielding layer spacing is limited by a preset critical value, and the line spacing is configured based on the multiple relation of the shielding layer spacing. And a sectional optimization strategy is adopted for the corners of the transmission line. The ratio of the aperture to the diameter of the anti-pad is optimized, and impedance mutation is reduced. According to the method, the key parameters of the target differential transmission line and the circuit board lamination parameters are acquired, and the electromagnetic simulation model is combined with the multi-physical field coupling algorithm, so that the insertion loss, the return loss and the impedance discontinuous point distribution can be accurately simulated. The method improves the adjustment efficiency, guarantees the accuracy of an adjustment result, and effectively reduces the signal transmission loss.

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 present invention discloses a microwave topological photonic crystal metasurface antenna, which belongs to the field of communication technology. The present invention adopts a layered structure similar to a patch antenna, including a ground plate, a dielectric layer, a topological photonic crystal, a rectangular metal frame, and a microstrip feeder arranged from bottom to top. The topological photonic crystal is arranged above the dielectric layer, the rectangular metal frame is coated on the periphery of the topological photonic crystal, and the microstrip feeder is connected to the rectangular metal frame. The present invention can achieve multi-band characteristics and extended bandwidth. In addition, most of the electromagnetic waves propagated by the antenna within the band gap range are suppressed, and only electromagnetic waves of the angular state frequency can propagate, with smaller return loss, and the topological angular state can achieve unidirectional radiation, with better directivity at high frequencies. As a result, the antenna performance is greatly improved, which is very suitable for on-chip optical interconnection and photonic chip integration, and meets the needs of 5G / 6G communications, quantum computing, etc. for miniaturized devices.

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 provides a low-coupling rewiring packaging structure and a preparation method thereof, and relates to the chip packaging technology, the packaging structure comprises a chip, a plastic package body, a dielectric layer, a reconfiguration circuit layer and solder balls, and the front surface of the chip is provided with a metal layer; the plastic package body wraps the periphery of the chip; the dielectric layer is arranged on the surface of the metal layer and covers the plastic package body; the reconstruction line layer is arranged in the dielectric layer and is connected with the metal layer; the solder ball is arranged on one side, far away from the chip, of the dielectric layer and is connected with the reconfiguration circuit layer; wherein the metal layer is etched to form an avoiding gap, the avoiding gap penetrates through the metal layer, and the projection of the reconstruction circuit layer on the front surface of the chip is at least partially overlapped with the avoiding gap. Compared with the prior art, by forming the avoiding gap overlapped with the reconstruction circuit layer on the metal layer, the overlapping area of the reconstruction circuit layer and the metal layer can be greatly reduced, the coupling effect with the RDL is reduced, and the return loss result of a high-frequency signal is greatly improved.

The invention discloses a method and device for measuring electrical input and output performance in a high-speed optical module, and the device is characterized in that an optical module golden finger interface module is connected with multiple groups of P / N poles of a to-be-measured high-speed optical module through golden fingers before a finished product is assembled; the electric switch chip is connected with the golden finger interface; the controller controls the on-off of the plurality of groups of P / N poles through the electric switch chip; the network distribution test equipment controls electric signals with different frequencies to be output to a group of P / N poles of the high-speed optical module to be tested every time under a test control signal of the industrial personal computer, acquires return loss electric signals generated by the high-speed optical module to be tested through the group of P / N poles, generates a frequency-return loss electric signal atlas and sends the atlas to the industrial personal computer; and the industrial personal computer enables the spectrum of the frequency-return loss electric signal to correspond to the channel of the high-speed optical module to be detected, and judges whether the high-speed optical module to be detected is qualified or not according to a preset return loss condition. According to the invention, defective products of the optical modules can be screened out before the optical modules are assembled into finished products.

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 an optical fiber insertion loss and return loss test management system and method, an optical power detection module comprises an input optical power detection unit, an output optical power detection unit and a reflected light power detection unit, and further comprises an optical emission module, an optical switch matrix and a data processing module, and the optical emission module is a quantum dot tunable laser module; the optical switch matrix is a bionic optical switch matrix, and multi-channel optical path reconstruction is realized; the optical power detection module is internally provided with a multi-physical field sensing array and detects optical power data in real time; the data processing module is used for receiving the optical power data and processing the data; comprising a test module for acquiring optical power data based on the optical power detection module and calculating optical fiber insertion loss and optical fiber return loss according to the acquired optical power data. The technical problems that the insertion loss measurement error is influenced by temperature drift, the switching time of an optical switch is too long, the rapid detection requirement of a 5G bearing network for batch optical fibers is difficult to meet, the real-time sensing and compensation capability is lacked, and the test result is not accurate in a complex environment are solved.

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 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 present invention discloses a double-clad fiber pump return filter, which relates to the technical field of fiber amplifiers and fiber lasers. The filter includes an input fiber collimator, a triangular prism, a supporting glass tube, a filter, an output fiber collimator, and a bridge glass tube; the supporting glass tube is fixedly installed in the middle position inside the bridge glass tube, and the triangular prism and the filter are respectively fixedly installed at both ends of the supporting glass tube; the input fiber collimator and the output fiber collimator are respectively inserted into the two ends of the bridge glass tube and fixed after optical debugging; the present invention uses the dispersion effect to cause the transmission angles of the pump light and signal light transmitted on the same optical fiber to deviate, and then the residual pump light can be returned to the original path while maintaining high return loss of the signal light, effectively improving the utilization efficiency of the pump light and having positive significance for improving the conversion rate of fiber amplifiers and fiber lasers.

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.

The present application relates to an optical coupling structure and an optical communication device. The optical coupling structure includes an optical transmitter chip, an anti-reflection film, a connector, a first photon lead, and a first optical component. An anti-reflection film is provided at the light outlet of the optical transmitter chip. A connector is used to connect the light outlet to the input end of the first photon lead. The anti-reflection film and the input end of the first photon lead are separated by an air cavity in the connector. Light emitted from the light outlet of the optical transmitter chip passes through the anti-reflection film, which reduces light reflection. The light then enters the air cavity of the connector. The refractive index of the anti-reflection film matches that of air, reducing light reflection on the anti-reflection film. The light then enters the return loss enhancement surface of the first photon lead, which reduces light reflection from the input end of the first photon lead back to the light outlet. Finally, the light is guided by the first photon lead to the first optical component. This optical coupling structure can improve return loss, reduce interference, and improve coupling efficiency.

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 present invention discloses a miniaturized broadband TEM antenna with dual linear polarization, dual circular polarization, and multiple modes. The antenna includes dual linear polarization modes and dual circular polarization modes, and the selection of the dual linear polarization mode and the dual circular polarization mode is achieved by controlling the feeding amplitude and phase difference of multiple ports. Quasi-TEM waves are generated by a metal stepped horn antenna and a planar multilayer feeding structure. A cross-slot structure and a multilayer substrate integrated waveguide (SIW) feeder are used to achieve independent dual linear polarization and dual right-handed / left-handed circular polarization multiple modes, effectively reducing the antenna size. Both the linear and circular polarization operating modes of the TEM antenna have a broadband return loss (less than 10 dB) and a high gain of 8.2-10.9 dBi within the operating range of 18-19.5 GHz. When operating as a circularly polarized antenna, the antenna axial ratio (AR) is less than 3 dB within this frequency range.

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 application discloses a kind of low-loss on-chip transmission lines based on non-periodic composite left-right hand structure, it is related to radio frequency integrated circuit design technical field, including first radio frequency port, second radio frequency port, M series resonance unit and N parallel resonance unit, each series resonance unit includes series right-hand inductance, left-hand capacitance, each parallel resonance unit includes parallel left-hand inductance, right-hand capacitance;M series resonance unit is in turn connected in series, one end of N parallel resonance unit is in turn loaded between two series resonance units, and the other end of parallel resonance unit is grounded, first radio frequency port is loaded in the free end of first series resonance unit, and second radio frequency port is loaded in the free end of M series resonance unit.The application uses non-periodic lumped transmission line to avoid too large size;While maintaining low loss, echo loss in broadband is all better than 20dB.

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.