124 results about "Field pattern" patented technology

Solid-state lighting devices, and more particularly, symmetrical lead frame structures for two-pin light emitting diode (LED) packages and methods for making the same are disclosed. The symmetrical lead frame structure can include a pair of leads that include symmetrical split cup portions that collectively, when placed next to each other, form a cup, across which an LED flip-chip can be placed. Each of the leads can be a respective electrode powering the LED flip-chip, which together with the symmetrical structure, provides a more even light emission profile and far-field pattern. A molded lens can be formed around the lead frame to protect the chip, as well as maintain a gap between the pair of leads of the lead frame structure. In some embodiments, a fill material can be added in the gap between the pair of leads.

Examples disclosed herein relate to a reflectarray panel for near-field wireless communication coverage area and designing the reflectarray panel. The method includes one or more following steps, including, determining a near field coverage area of the reflectarray panel, calculating a tangential reflected field on a reflectarray surface of the reflectarray panel based at least on a feed location and initial geometric parameters of the reflectarray surface, determining radiation pattern specifications with an incident beam pointed toward a center of the near field coverage area, performing a near-field pattern synthesis algorithm on an initial phase distribution of the reflectarray panel, determining a synthesized phase distribution on the reflectarray surface from a result of performing the near-field pattern synthesis algorithm, adjusting one or more geometric parameters of each reflectarray cell of the reflectarray panel to produce the synthesized phase distribution, and / or determining dimensions of the reflectarray panel for manufacturing.

According to the embedded rapid scanning system, a detection device is vertically arranged on an installation support, the installation support is fixed to the position above a production line through two stand columns, an antenna can be placed on the production line after being produced and flows backwards, and when the antenna flows to the position below the detection device, the detection device is based on the near-field scanning and far-field conversion technology; the device transversely moves above an antenna radiation surface, samples a near field, measures amplitude and phase values of an oscillator, can also convert the amplitude and phase values into a vertical plane far-field directional diagram, extracts radiation parameters, is simple and rapid in test process, takes a production line as a workbench, does not need to be additionally provided with a workbench, reduces the size, is embedded in the production line, and improves the test efficiency. And when one antenna is tested to be unqualified, interception can be directly carried out, so that the yield of products is ensured.

The invention discloses a spherical near-field antenna measurement method and system, and the method comprises the steps: generating a sampling point coordinate sequence on a measurement spherical surface based on a preset algorithm, and enabling the sampling point coordinate sequence to form a continuous spiral track from a first pole to a second pole; controlling the measuring probe to move at a constant speed along the continuous spiral track, and synchronously acquiring near-field complex electric field data of the to-be-measured antenna when the measuring probe moves to each sampling point to form a complex electric field data vector; constructing a linear equation of spherical wave expansion based on the complex electric field data vector, the sampling point coordinates and the measured spherical radius, and solving the linear equation by adopting a regularization method to obtain a spherical wave coefficient vector; and calculating a far-field pattern of the to-be-tested antenna based on the spherical wave coefficient vector. According to the invention, the technical problems of high sampling redundancy, discontinuous mechanical scanning path, dependence on interpolation and low precision in the existing antenna measurement technology are solved.

The invention discloses a phase-free antenna measurement method, a phase-free antenna measurement system and a storage medium. The phase-free antenna measurement method comprises the following steps: constructing a measurement system comprising an antenna to be measured, a measurement probe, a fixed auxiliary reference antenna and software defined radio; the probe is controlled to move and sample on the scanning plane, and the SDR synchronously collects receiving signals of the probe and the reference antenna; based on the frequency domain transformation result of the two paths of signals, the radiation field amplitude of each sampling point and the relative phase relative to the reference antenna are directly calculated through non-iterative operation, so that complete complex electric field distribution on the scanning plane is reconstructed; and finally, obtaining a far-field directional diagram through near-field-far-field transformation. The fixed reference antenna is introduced to serve as a phase reference, synchronous acquisition and direct calculation are achieved in combination with the SDR, the antenna radiation field can be rapidly and accurately recovered without direct phase measurement or complex iteration in the single scanning plane and single scanning process, and the method has the advantages of being simple in system, high in measurement efficiency and high in signal drift resistance.

Light-emitting diode (LED) packages and more particularly anchored light mixing structures in LED packages and related methods are disclosed. LED packages include one or more LED chips and integrated light mixing structures, such as light collectors, that are placed over the LED chips to modify far field patterns. Light mixing structures are provided within recesses of LED package housings in positions over the LED chips. Sidewalls of recesses may include alignment features with shapes configured to receive corresponding shapes of light mixing structures. Alternative configurations, alone or in combination with the sidewall alignment features, may include alignment features on top surfaces of the LED packages outside of a recess. As disclosed herein, alignment features are arranged to effectively anchor a light mixing structure in place during package assembly. Additional package structures, such as encapsulants and / or epoxies, may further hold the light mixing structures in place.

A measuring system and a measuring method of an antenna pattern based on near field to far field transformation (NFTF) are provided. The measuring system includes a probe antenna, a reference antenna, and a control system. The probe antenna measures an electric field radiated by an antenna under test to obtain electric field information. The reference antenna measures the electric field to obtain a reference phase. The control system is coupled to the antenna under test, the probe antenna, and the reference antenna, wherein the control system applies near field focusing to the reference antenna to configure a focus point of the reference antenna on the antenna under test, and the control system performs the NFTF according to the electric field information and the reference phase to output far field patterns.

The application discloses a kind of consistency construction and multi-dimensional parameter joint setting method and system of space field of course beacon, it is related to aviation technology field, comprising: constructing the three-dimensional electromagnetic simulation model of course beacon antenna array, the radiation directivity diagram of antenna array and channel field type characteristics are analyzed;Antenna array is installed and checked and precision is reviewed;Determine that the radio frequency performance of full transmission link meets the requirements;According to correct transmission link, adopt the method of phase matching to carry out channel antenna pair phase matching and clearance antenna pair phase matching in turn, so that the phase of the radiation signal of each antenna pair is the same, and the spatial consistency of antenna pair is constructed;Near-field-far-field signal joint test setting is carried out, near-field test data and far-field test data are obtained, channel line, displacement sensitivity and clearance signal are evaluated, combined with simulation model and actual environment, complete multi-dimensional parameter joint setting.The method significantly improves the consistency and excellence of the final combined field pattern of the space field of the course beacon, and reduces the trial-and-error cost and rework times of flight verification.

The invention relates to the field of machine vision three-dimensional measurement, in particular to a self-adaptive high dynamic range measurement algorithm and device based on time domain stacking. According to the algorithm, through an adaptive parameter selection formula, the exposure time and the stacking frequency are automatically adjusted according to measurement scene requirements, the measurement precision is ensured, and exposure errors are avoided. The method comprises the following core steps: acquiring a phase shift fringe pattern of a measurement scene, and calculating an average white field pattern and a modulation degree and intensity proportionality coefficient thereof; selecting a region of interest according to the white field pattern, setting expected precision, and calculating optimal measurement parameters through a self-adaptive parameter selection method; and finally, performing three-dimensional reconstruction on the scene to obtain a measurement result conforming to expected precision. The invention further provides a corresponding measuring device which comprises a projection module, an image acquisition module and a data processing module, the three-dimensional morphology in a high dynamic range scene can be efficiently and accurately measured, the measuring efficiency and precision are remarkably improved, and meanwhile resource utilization is optimized.

The invention provides an antenna field pattern visual measurement method, device, equipment and medium, and relates to the technical field of electromagnetic field measurement, and the method comprises the steps: constructing a visual model of an antenna according to the geographic coordinate, the measurement radius and the antenna height of the antenna; determining a sampling track on the visual model according to the measurement parameters of the antenna; mapping the sampling track into a geographic track according to a preset track mapping rule; according to the geographical trajectory, generating a route file which can be identified by the unmanned aerial vehicle, so as to control the unmanned aerial vehicle to collect electromagnetic field intensity data along the geographical trajectory; and carrying out combination and image drawing on the electromagnetic field intensity data and the measurement parameters to generate an antenna field pattern image. According to the technical scheme of the embodiment of the invention, the problems of poor visualization effect and low planning operation efficiency can be solved.

The invention provides a semiconductor laser element with improved service life. This semiconductor laser element is provided with: a first semiconductor layer which is a group III-V compound semiconductor layer containing at least As as a group V element; a second semiconductor layer on the first conductive side, which is a group III-V compound semiconductor layer containing at least P as a group V element, and which is disposed on the first semiconductor layer; a second conductive-side third semiconductor layer disposed on the second semiconductor layer; an active layer disposed between the second semiconductor layer and the third semiconductor layer; a window structure formed across the third semiconductor layer, the active layer, the second semiconductor layer, and the first semiconductor layer; a defect layer having a group III element of the first semiconductor layer and a group III element of the second semiconductor layer between the first semiconductor layer and the second semiconductor layer and including a defect in a region formed in the window structure; and an end surface that includes a defect layer that does not overlap the near-field pattern of the laser light on the end surface, or that overlaps only at the edge of the near-field pattern on the end surface, and that emits the laser light.

The invention discloses an antenna pattern reconstruction method, which relates to the technical field of wireless communication and antenna testing, and comprises the following steps of: selecting two measurement distances in a near-field area, determining a probe angle range and a probe angle interval, and measuring amplitude data of an antenna in a single tangent plane direction to obtain an antenna near-field amplitude pattern on the single tangent plane; copying the antenna near-field amplitude directional diagrams at the two measurement distances measured in the single tangent plane direction to azimuth angles in other spherical coordinate systems, and obtaining 3D antenna near-field amplitude directional diagrams on two spherical surfaces; recovering phases by utilizing the 3D antenna near-field amplitude directional diagrams on the two spherical surfaces to obtain a plurality of near-field directional diagrams of the to-be-tested equipment on the two spherical surfaces; and calculating an antenna far-field pattern of the to-be-tested equipment according to the plurality of near-field patterns of the to-be-tested equipment on the two spherical surfaces. According to the method, system parameters are optimized, so that the measurement cost and time are remarkably reduced, and the method is suitable for rapid air interface (OTA) testing of a 5G large-scale MIMO base station.

The present application provides a multi-element electric small antenna with reconfigurable side-firing and horizontal omnidirectional patterns, including a first dielectric substrate and a second dielectric substrate arranged in parallel with each other; the first dielectric substrate is provided with a first radiating metal patch and a T-shaped connecting metal patch on the upper and lower surfaces respectively, and the second dielectric substrate is provided with a second radiating metal patch and a T-shaped radiating patch on the lower surface; the first radiating metal patch, the T-shaped connecting metal patch, and the second radiating metal patch are connected to each other through metal columns; PIN diodes are loaded on the first radiating metal patch, the second radiating metal patch, and between the second radiating metal patch and the T-shaped radiating patch, and the far-field directional pattern switching between side-firing and horizontal omnidirectional radiation is realized by switching the on-off state of the three PIN diodes. The present invention breaks through the previous directional pattern beam reconfiguration and antenna polarization mode reconfiguration, and realizes the reconfiguration of two types of directional patterns: vertically polarized horizontal omnidirectional radiation and circularly polarized side-firing.

The invention relates to the technical field of electric data processing, and discloses a human body behavior recognition method, device and equipment and a storage medium, and the method comprises the steps: obtaining a human body heat radiation distribution diagram collected by an infrared sensor for a target object; performing thermal gradient calculation on the human body thermal radiation distribution diagram to generate a direction field diagram; acquiring a thermal gradient direction histogram based on the direction field pattern; and using a human body behavior recognition model to predict the thermal gradient direction histogram to obtain the behavior classification of the target object. According to the method, the problem of low human behavior recognition accuracy caused by insufficient low-resolution thermal imaging data information can be solved, the image quality is improved without super-resolution reconstruction preprocessing, high-complexity calculation is avoided, the human behavior recognition efficiency is high, and the real-time requirement of human behavior recognition is met.

This invention discloses a design method for a large-spacing, low-sidelobe uniform array, belonging to the field of array antenna technology. The method first designs the initial structure of a movable phase-center antenna element and obtains its far-field data; then, based on the array antenna design specifications, it constructs the array antenna and obtains the far-field radiation pattern; next, it uses a genetic algorithm to optimize the phase center of the array elements, obtaining the optimized phase center position distribution; finally, it changes the structure of each array element to move its phase center to the optimized position; and finally, the design is verified and completed. This invention utilizes movable phase-center antenna elements as array elements, enabling the reduction of far-field sidelobes in a uniformly spaced array distribution without changing the excitation amplitude and phase of each element.

A method for generating a 3D image of a body shape includes obtaining a set of far-field patterns of electromagnetic waves from a given body shape of a human or animal, establishing a one-to-one correspondence between the body shape and the set of far-field patterns of electromagnetic waves, representing the far-field patterns as a shape generating vector, mapping a vector of characteristic parameters to the shape generating vector, producing a body generation model by taking the vector of characteristic parameters and the shape generating vector as input and output data to form a training dataset for machine learning, specifying a characteristic vector of an unknown geometric body shape and obtaining a shape generating vector of the unknown geometric body shape based on the body generation model, and reconstructing the unknown geometric body shape based on the shape generating vector.

A laser element (LD) comprising a photonic crystal layer (6) onto which laser light is incident, the photonic crystal layer (6) comprising: a first region consisting of a carrier layer (6A) formed from a medium having a first refractive index; and a plurality of second regions (6B), each formed from a medium having a second refractive index which has a refractive index different from that of the medium having a first refractive index, and which are arranged in the carrier layer (6A), wherein each region of the plurality of second regions (6B) has a planar shape of a triangle, an ellipse in which a numerical eccentricity is different from zero, or has a non-rotationally symmetric shape, wherein unit configuration regions (R11 - R34) are arranged two-dimensionally in an XY plane containing an X-axis and a Y-axis, each unit configuration region (R11 - R34) comprising exactly one second region (6B), wherein in each unit configuration region (R11 - R34), a rotation angle of a point on an outline of the planar shape with respect to a center point of the second region (6B) is denoted by φ, wherein an X-coordinate and a Y-coordinate of a center point (G) of each of the unit configuration regions (R11 - R34) are given by a center point of the associated second region (6B), wherein the angle of rotation φ increases proportionally to an increase in the X-coordinate of the unit configuration area (R11 - R34) at equal intervals and wherein the angle of rotation does not change despite a change in the Y-coordinate of the unit configuration area (R11 - R34), wherein a two-dimensional phase distribution of an image obtained by performing an inverse Fourier transform on a far-field image corresponds to a distribution of the rotation angles φ at the locations of the unit configuration areas (R11 - R34), wherein the entire photonic crystal layer (6) contains at least three different rotation angles φ, wherein the laser element (LD) is configured such that a far-field pattern image of a laser beam is emitted in a state in which it is inclined with respect to a direction perpendicular to a light-emitting surface of the laser element (LD).

The invention belongs to the technical field of antennas and microwaves, and discloses an electromagnetic compatibility simulation method for an electrically large carrier platform array antenna and a medium. According to the method, the FEM-UTD hybrid algorithm is adopted, the far-field directional diagram of the complex-structure antenna is calculated and extracted by using the FEM method, the array antenna equivalent radiation model is accurately established according to the actual position, arrangement, phase and the like of the array antenna by using the extracted far-field directional diagram according to the far-field equivalence principle, and the array antenna equivalent radiation model is used as an array antenna excitation source. And electromagnetic compatibility simulation of the electrically large-size carrier platform array antenna is realized by using a UTD algorithm. On the premise that the precision is guaranteed, the hardware limitation of a full-wave algorithm on the electrically large size problem is broken through, meanwhile, the defects of a pure UTD algorithm on antenna modeling are overcome, and the balance of electromagnetic compatibility simulation among precision, efficiency and cost is achieved.

This invention discloses a method for analyzing the electrical performance range of an antenna radome based on interpolation. The method includes randomly generating multiple sets of thickness error and relative permittivity error distribution values ​​within the radome's thickness error range and relative permittivity error range; plotting the far-field radiation pattern of the antenna after adding the radome; extracting the variation range of electrical performance indicators from the pattern; discretizing the incident angle, polarization angle, thickness, and relative permittivity at various points on the radome; and calculating the transmission coefficient T of the main polarization component based on the discrete points. M Extract T M The amplitude and phase variation ranges are used to obtain T by interpolation. M In the sector-shaped interval formed in the complex domain, the sector-shaped interval is divided into polygonal intervals. The polygonal intervals are added together to calculate the range of changes in the far-field radiation pattern of the radome. The range of changes in the electrical performance index is extracted. It is determined whether the electrical performance index of the radome meets the preset requirements. If it does, the process ends. Otherwise, the number of segments in the sector arc is modified until the range of changes in the electrical performance index that meets the preset requirements is obtained.

The invention discloses a Moore intelligent reflecting surface for realizing beam forming. The Moore intelligent reflecting surface is structurally composed of four layers of materials, wherein the first layer and the second layer are periodic metal pattern layers which have different rotational symmetry and are tightly attached, the third layer is a dielectric material isolation layer, and the fourth layer is a metal backboard layer. The Moore intelligent reflecting surface can reflect a vertical incident wave, surface impedance distribution can be adjusted by changing the style of the metal pattern layer, and beamforming of the reflected wave is achieved. By endowing the two layers of periodic metal patterns with different rotational symmetry, single-beam, two-beam and three-beam far-field directional diagrams can be formed; the two layers of metal patterns are mutually rotated along the central axis, so that continuous scanning adjustment can be carried out on the pitch angle of a reflected wave beam within the range of 0-60 degrees and the azimuth angle within the range of 0-360 degrees. The design does not need an active device, and compared with a beam forming mode of a traditional active device, the beam forming device has the advantages of being low in cost, low in power consumption, low in profile, high in reliability, not prone to breakdown and the like.

The utility model provides a notebook computer which comprises at least one cavity antenna, the cavity antenna is arranged between a keyboard surface and a lower cover plate of the notebook computer, and the distance between an antenna radiation plate and a specified plane ranges from one sixteenth of the antenna wavelength to one eighth of the antenna wavelength, the specified plane is a plane where the bent surface of the upper cover plate of the notebook computer is located when the upper cover plate is opened to a preset angle. The field pattern of the notebook computer antenna is relatively concentrated, after reflection of the metal plate of the cavity antenna, the antenna field pattern can reduce dead angles of receiving / transmitting of the antenna by utilizing scattering of light wave transmission, the coverage ratio of the radiation field pattern of the antenna is increased, and the transmission efficiency of the antenna is improved.

The present invention belongs to the technical field of radar antenna testing. The present invention discloses a method for testing an automotive millimeter-wave radar antenna and an antenna testing system, including: installing the automotive millimeter-wave radar antenna to be tested; performing static testing on the installed automotive millimeter-wave radar antenna to be tested through a vector network analyzer to determine whether the static testing of the automotive millimeter-wave radar antenna to be tested is qualified; performing far-field pattern testing on the automotive millimeter-wave radar antenna to be tested with qualified static testing to determine whether the far-field pattern testing is qualified; performing dynamic testing on the automotive millimeter-wave radar antenna to be tested with qualified far-field pattern testing to determine whether the speed measurement accuracy of the automotive millimeter-wave radar antenna to be tested is qualified. If the speed measurement accuracy is qualified, the overall automotive millimeter-wave radar antenna to be tested is qualified; if the speed measurement accuracy is unqualified, the overall automotive millimeter-wave radar antenna to be tested is unqualified, further improving the accuracy of testing.

This application discloses a method, apparatus, medium, and equipment for testing optical waveguide transmission loss. The method includes: conditioning input light; collecting a digital field pattern of the conditioned input light after it is transmitted through an optical waveguide sample to be tested; constructing and training a transmission loss coefficient test model; inputting the pre-processed digital field pattern into the trained transmission loss coefficient test model to obtain the power of the output light; and obtaining the transmission loss coefficient of the optical waveguide sample to be tested based on the power of the input and output light. This application can improve the accuracy of optical waveguide transmission loss testing.

The present application provides an antenna device, which includes a housing assembly, a first waveguide assembly and a second waveguide assembly. The interior of the housing assembly defines a cavity, and a slot is formed through the first side of the housing assembly. At least a portion of the first waveguide assembly is located in the cavity and is connected to the first side of the housing assembly. The projection of the first waveguide assembly on the first side of the housing assembly is symmetrically located on both sides of the slot. The second waveguide assembly is located outside the housing assembly, near the first side and connected to the slot. The second waveguide assembly is adapted to transmit an antenna signal through the slot to the cavity via the first waveguide assembly. The antenna signal resonates in the cavity and is radiated outward from the second side of the cavity relative to the first side. The antenna device of the present application has good signal transmission effect and stable and symmetric field pattern distribution.

The invention belongs to the technical field of optical detection, and particularly relates to a dark-field microscope wafer defect extended depth-of-field detection system. According to the system, a 4f system comprising a phase mask is integrated behind a traditional dark field wafer defect detection system, so that a point spread function of an optical system is modified, and the phase mask is designed by limiting the variation trend of gradient variance of an intensity image of the point spread function of the optical system along with defocusing amount; the depth of field of the detection system is expanded. According to the invention, larger out-of-focus tolerance is provided for a dark-field pattern-free wafer defect detection system, so that wrong detection or missing detection caused by out-of-focus of the detection system due to wafer warping or mechanical vibration is avoided, and thus the dependence on a mechanical real-time automatic focusing system which is high in cost, complex in structure and difficult to manufacture is reduced; the method is especially suitable for related applications in optical detection fields such as wafer defect detection.

A near-field and far-field encryption method based on the amplitude characteristics of singular points, comprising the following steps: 1) constructing a nano-structure unit, the nano-structure unit being composed of a substrate and nano-bricks deposited on the substrate; 2) optimizing parameters: according to a selected working wavelength, optimizing the structural parameters of the nano-bricks by using CST electromagnetic simulation software; 3) determining the structural parameters at which the EP is located, determining the singular point EP by using the CST electromagnetic simulation software by changing the structural parameters of the nano-bricks; 4) determining the phase distributions of two holographic images I A and I B ; 5) arranging a nano-structure array: according to the phase distributions of the two holographic images I A and I B determined in step 4), obtaining the PB phase by changing the rotation angles of the two kinds of nano-bricks to meet the phase distributions; 6) observing the nano array arranged in step 5), with RCP light incident from the front of the metasurface, the first holographic image I A can be detected on the reflection surface, and at the same time, the near-field displays the pattern I C ; with LCP light incident from the front of the metasurface, the second holographic image I B can be detected on the reflection surface, and at the same time, the near-field displays the complementary pattern of the pattern I C . The method of the present application is ingeniously designed, not only manipulates the phase information of the unit structure, but also realizes the near-field pattern by using the amplitude difference, and can be used for near-field and far-field encryption at the same time.

The invention discloses a large-scale foldable array antenna full-condition electrical performance rapid estimation method. The method comprises the following steps: determining folding structure parameters of a folding array antenna configuration; calculating a corner relation between the basic folding units, determining an array element center point position vector and a rotation matrix of the folding array antenna under different unfolding working conditions, and further determining a position vector of an array area division point and a mode excitation coefficient matrix and a mode coupling matrix of the folding array antenna under different folding conditions; and calculating a far-field pattern of the foldable array antenna under each working condition, and quickly estimating the electrical performance of the foldable array antenna under the full working condition. According to the method, the structure parameterization characterization and electrical property rapid calculation of the two-dimensional folded array antenna can be completed, and the problem that the calculation precision is low due to the fact that an existing far-field estimation method is unclear in characterization of the mutual coupling effect of array elements in the array antenna is effectively solved.

The optical semiconductor device (100) of the present disclosure includes a stripe-shaped ridge structure (130) composed of a lower clad layer (102), an active layer (111), and a first upper clad layer (103) on a substrate (101), an embedding layer (120) that embeds both side surfaces of the ridge structure (130), a second upper clad layer (104) formed on the upper surface of the ridge structure (130) and the upper surface of the embedding layer (120), and a stripe-shaped contact layer (141) formed on the upper surface of the second upper clad layer (104). In at least a part of the region along the stripe direction, the contact layer (141) and the Two contact layer width Wc, which is the distance between one end and the other end where the upper clad layer (103) is in contact is activated, and the active layer width Wa is larger than the full width at half maximum Wf of the horizontal near-field pattern of the light guided by the active layer (111). is smaller than the active layer width Wa When the light is activated, the active layer width Wa is larger than the full width at half maximum Wf of the horizontal near-field pattern of the light guided by the active layer (111). This is characterized by.

The invention discloses a bidirectional wave beam scanning leaky-wave antenna based on a trapezoidal sliding symmetrical structure. The bidirectional wave beam scanning leaky-wave antenna comprises an input end transition part used for feeding, an electromagnetic field modulation radiation array and an output end transition part used for matching absorption, a second rectangular waveguide cavity is arranged in the electromagnetic field modulation radiation array, cascaded trapezoidal metal resonant cavities in sliding symmetry are introduced into the inner sides of the upper wall and the lower wall of the second rectangular waveguide cavity, and the trapezoidal metal resonant cavities in sliding symmetry are the same in geometric size and staggered by a half structural period in the propagation direction; a radiation slot array is arranged on the upper wall of the electromagnetic field modulation radiation array to form a composite energy coupling area for electromagnetic field modulation; the input end transition part and the output end transition part are of a symmetrical structure, and the first rectangular waveguide cavity close to the electromagnetic field modulation radiation array is provided with a gradual change impedance matching section, so that smooth impedance conversion and field pattern matching are realized; transmission of a fast wave mode and a slow wave mode can be supported at the same time.

The application relates to a kind of multi-rotor unmanned aerial vehicle-based antenna far field pattern near distance measurement system and method, including multi-rotor unmanned aerial vehicle, signal transceiver unit, data acquisition equipment, photoelectric converter;Signal transceiver unit includes signal transceiver module, electro-optical converter, receiving antenna and wireless transmission module;The application is centered on the antenna to be measured, controls multi-rotor unmanned aerial vehicle to carry out horizontal semicircle flight around the antenna to be measured, and signal transceiver module emits an electric signal every N degrees on azimuth angle θ;Electric signal is converted into optical signal, is transmitted to photoelectric converter through optical fiber and is converted into electric signal again and is emitted through the antenna to be measured, and receiving antenna receives the electric signal, carries out near far field conversion processing, obtains the far field pattern of the antenna to be measured.The application can obtain the accurate amplitude and phase information of the antenna to be measured because the signal received by receiving antenna and the transmitting signal have the same source, form coherence.