41 results about "Radiation scattering" patented technology

The invention discloses a liquid metal-based polarized reconfigurable radiation-scattering integrated antenna array, which is composed of four sub-arrays, each sub-array comprises a metasurface antenna layer, a metalized ground layer and a feed network layer, the metasurface antenna layer is formed by periodically arranging units and is placed on the upper surface of a first dielectric plate, and the metalized ground layer is arranged on the upper surface of the first dielectric plate. The antenna is mainly used for realizing circular polarization radiation and reducing a radar cross section. The feed network layer is mainly composed of Wilkinson power dividers and is placed on the lower surface of the second dielectric plate; and a metalized ground layer is arranged between the two dielectric plates. In the feed network layer, the signal transmission path of the feed network is changed by regulating the position of the liquid metal, so that the polarization reconfigurable function of the sub-array is realized; according to the invention, the reduced bandwidth of the radar cross section of the antenna array is expanded by arranging the sub-arrays at different heights. According to the invention, the liquid metal is adopted to control the feed network, the reconstruction of antenna polarization is realized, and the working bandwidth of radar scattering reduction is widened through the unequal-height placement of the sub-arrays.

A computer-implemented method for scattered radiation correction, comprising the steps: obtaining projection images, optimizing a measure of quality by variation of correction parameters depending on the projection images, wherein a determination algorithm, which serves to determine the measure of quality, is an algorithm trained by machine learning and processes as its input data a reconstructed three-dimensional image dataset or processing data that is chosen from the image dataset, wherein the image dataset is based on corrected projection images, wherein a respective corrected projection image results from application of a correction algorithm, wherein the correction algorithm is parameterized by the correction parameters, provision of radiation scatter-corrected projection images and / or of a radiation scatter-corrected reconstructed three-dimensional image dataset.

The invention provides an electron irradiation dose on-line measurement and feedback calibration system and method, and relates to the technical field of automation control, and the system comprises a processing module which is used for converting an original dose signal into a five-path digital reading sequence, carrying out the timestamp alignment and space coordinate calibration of the five-path digital reading sequence, and outputting a calibration result; generating a three-dimensional discrete coordinate data set representing radiation field intensity space distribution; and the extraction module is used for identifying a radiation intensity global maximum value point from the three-dimensional discrete coordinate data set as a spatial registration origin, extracting two feature straight lines representing a radiation scattering dominant direction, and calculating a spatial orientation included angle between the two feature straight lines to determine a radiation scattering main influence area. According to the invention, precise processing of an original dose signal, scientific positioning of a radiation influence area and construction of a dynamic compensation model are realized through cooperation of multiple modules, a high-confidence dose value can be output, feedback calibration is completed based on a time sequence drift trend, and the precision and reliability of on-line measurement of the electron radiation dose are effectively guaranteed.

The invention relates to the technical field of photovoltaic power prediction, in particular to an ultra-short-term prediction system and method based on image analysis, and the system comprises an all-sky imaging data processing module, a cloud layer dynamic feature calculation module, a solar irradiance change prediction module, a photovoltaic power generation power calculation module and a prediction model optimization training module. According to the method, the cloud layer thickness, transparency, movement direction and coverage rate change are calculated, the cloud layer dynamic characteristic analysis precision is enhanced, and the radiation scattering coefficient is calculated in combination with the direct solar light shielding ratio, the cloud layer characteristics and the solar angle, so that the irradiance calculation is more accurate, the illumination change rate is analyzed, and the short-term irradiance trend is dynamically adjusted; the total power is calculated and the shielding influence is adjusted in combination with component arrangement, so that the power prediction is more practical, the input data is normalized, the time sequence sample is enhanced, the dynamic adjustment of the model parameters is optimized, and the adaptive capacity and the prediction stability are improved.

The invention provides a high-gain low-RCS (radar cross section) metasurface antenna with a wave beam deflection function, which belongs to the technical field of electromagnetic metamaterials and comprises an upper-layer metasurface and a lower-layer metasurface, and multifunctional regulation and control on an electromagnetic wave radiation scattering mode are realized by adopting the upper-layer metasurface and the lower-layer metasurface which are different in size. Wherein the upper-layer metasurface is a PCM-FSS scattering-transmitting integrated metasurface, and the lower-layer metasurface is a phase gradient metasurface. When the high-gain low-RCS metasurface antenna works in a radiation mode, the upper-layer metasurface emits spherical electromagnetic waves downwards, and when the spherical waves reach the lower-layer metasurface, the spherical waves are reflected into high-gain directional wave beams with the deflection angle being 34 degrees through phase compensation and penetrate through the upper surface to be radiated to a free space; when working in a scattering mode, the upper and lower layers of metasurfaces can deflect reflected waves of external electromagnetic waves to a non-threat angular domain direction. In the frequency band of 8-18 GHz, the RCS reduction amplitude reaches 10 dB or above, and in-band and out-of-band large-amplitude RCS reduction is achieved while high-gain radiation is kept.

The invention relates to a lower frequency band radiating element with reduced scattering of higher frequency band radiation. A radiating element includes: a feed stem printed circuit board including a first RF transmission line and a second RF transmission line; a first dipole radiator coupled to the first RF transmission line; and a second dipole radiator coupled to the second RF transmission line. The first dipole radiator comprises a first dipole arm and a second dipole arm, and the second dipole radiator comprises a third dipole arm and a fourth dipole arm. A first amount of coupling between the first dipole arm and the third dipole arm exceeds a second amount of coupling between the first dipole arm and the fourth dipole arm.

The invention relates to the technical field of oil and gas field development, and particularly discloses a light scattering-based nano-bubble water concentration and nano-bubble particle size detection method, which comprises the following steps: carrying out an experiment of preparing nano-bubble water on the ground, and measuring the gas consumption and water consumption for preparing the nano-bubble water and the water amount of generated nano-bubbles; the method comprises the following steps: sequentially introducing laser with different angles and different wavelengths into prepared nanobubble water, respectively capturing an image of a light path generated in the nanobubble water and the number of photons by utilizing a light intensity detector, and converting the number of the photons into a numerical value capable of reading scattering light intensity; the method comprises the following steps: assuming the diameter of a nanobubble in nanobubble water, and adjusting the diameter of the nanobubble through a least square method algorithm until the theoretical scattered light intensity and the obtained scattered light intensity conform to a set error; and calculating a dimensionless size parameter by using the adjusted diameter of the nanobubble, and constructing a relational expression of scattered light intensity, nanobubble water concentration and nanobubble radius for detection based on Mie scattering and Rayleigh scattering.

Disclosed are methods for minimizing x-ray scattering artifacts, the method comprising: contacting an object with an x-ray scattering mitigation material. The contacting can comprise coating the x-ray scattering material on the object, including spraying a solution of suspension of an x-ray scattering mitigation material onto the object or dry powder coating the object with a x-ray scattering mitigation material. Alternatively, the contacting can comprise immersing the object in a fluid comprising the x-ray scattering material. The fluid can be a gas, a liquid, or a gel. The disclosed x-ray scattering mitigation material can be optimized for mitigating Compton radiation scattering or for mitigating Rayleigh radiation scattering. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present disclosure.

The invention provides a space-based full-link photoelectronic imaging simulation method based on CUDA (Compute Unified Device Architecture), and solves the problems of complicated calculation, insufficient simulation precision and high hardware requirements in the prior art. The method comprises the following steps: dividing the surface of a target three-dimensional model into triangular surface elements and calculating target intrinsic radiation scattering data of each surface element; generating background intrinsic radiation scattering data in real time through CUDA (Compute Unified Device Architecture) parallel calculation according to the space-time spectrum parameters and the earth surface / cloud layer / limb basic model library; calculating characterization radiation before entrance pupil based on target and background intrinsic data; the entrance pupil radiation is converted into a detector voltage signal through CUDA parallel optimization, and a gray infrared simulation image is generated. According to the method, the calculation efficiency is remarkably improved, and space-based full-link photoelectric imaging simulation with high authenticity and real-time performance is realized.

The invention discloses a wide-angle-domain low-scattering antenna design method based on a characteristic mode theory, and belongs to the technical field of antenna stealth design. The antenna is designed according to radiation performance requirements, then radiation mode analysis is carried out, the important radiation mode is determined according to the mode amplitude, and the area to be reserved of the antenna is determined according to the mode current distribution condition of the important radiation mode of the antenna; then, calculating a wide-angle-domain RCS and a scattering mode of the antenna according to a stealth requirement, selecting a common important scattering mode in the wide-angle domain according to the scattering mode amplitude, and selecting scattering current which can be removed or cut according to the current distribution condition of the common important scattering mode of the antenna and the current distribution characteristics of the important scattering mode; and the mode current of an important radiation mode is not influenced, so that the wide-angle-domain low-scattering antenna design is realized. The antenna designed by the invention has the advantages of integration of radiation and scattering, wide angular domain and low scattering, and can meet single-station / double-station RCS stealth requirements.

The invention discloses a radiation and scattering integrated microstrip antenna based on an artificial magnetic conductor, and belongs to the technical field of microwave antennas. The antenna comprises a microstrip antenna, four first artificial magnetic conductor (AMC) arrays and four second AMC arrays, the microstrip antenna is located in the center, and the four first AMC arrays and the four second AMC arrays are distributed on the periphery in a chessboard structure mode. Compared with the original microstrip antenna, the radiation-scattering integrated microstrip antenna based on the artificial magnetic conductor has the advantages that the antenna bandwidth is basically unchanged, the gain of the antenna is improved, and the radiation performance of the original radiation antenna is not influenced; the RCS of the antenna is effectively reduced in a broadband, the overall profile is low, and the antenna can be used in the fields of modern wireless communication systems, electronic reconnaissance and confrontation and the like.

A resonant amplitude grating mark has a periodic structure configured to scatter radiation (602) of wavelength λ incident (600) on the alignment mark. The scattering is primarily due to coupling of the incident radiation into a waveguide mode in the periodic structure. The effective refractive index (n) of each portion of the periodic structure is l , n2) and length (d l , d2) are configured to provide an optical path length (n1d1+n2d2) of the unit cell in the periodic direction, the optical path length (n1d1+n2d2) being equal to an integer multiple (mλ) of the wavelength present in the spectrum of the radiation. The effective refractive index (n l , n2) and length (d l , d2) is also configured to provide an optical path length (n2d2) of the second portion in the periodic direction, wherein the optical path length (n2d2) is 0.30 to 0.49 times the wavelength presented in the spectrum of the radiation.

The present invention provides a method, device, equipment, and medium for designing an integrated radiation-scattering metasurface array, comprising: establishing an initial metasurface unit; constructing a reflection coefficient model for the initial metasurface unit and optimizing the distribution of metal patches in the initial metasurface model; adding multiple pixel patches, constructing a reflection coefficient model for the pixel patches, optimizing the distribution of the pixel patches and the connection of ports between the pixel patches, to obtain an integrated radiation-scattering metasurface unit; arranging microstrip lines on both sides of the integrated radiation-scattering metasurface unit, arranging an array of integrated radiation-scattering metasurface units with the microstrip lines, to obtain an initial integrated radiation-scattering metasurface array; constructing a radiation feed network; and optimizing the initial integrated radiation-scattering metasurface array to obtain an integrated radiation-scattering metasurface array. While achieving integrated multifunctionality, the present invention ensures the high performance of the metasurface array, improves integration, and simplifies structural complexity.

The invention discloses a design method of a broadband dual-polarization low-scattering array antenna, and belongs to the technical field of array antenna stealth design. According to the method, the radiation mode of the reference array antenna and the x-polarization and y-polarization broadband scattering modes are calculated and analyzed based on characteristic mode analysis, and then the design of the scattering cancellation unit / low scattering unit is given. And finally, in the co-polarization direction, array antenna co-polarization RCS reduction is realized through scattering cancellation unit array forming. In the cross polarization direction, array antenna cross polarization RCS reduction is achieved through low scattering unit array forming. Through the arrangement mode of the two polarization directions, a two-dimensional array antenna can be formed, and the two-dimensional array antenna is called as a broadband dual-polarization low-scattering array antenna. Therefore, the design of the broadband dual-polarization low-scattering array antenna is realized. The array antenna designed by the invention has the advantages of integration of radiation and scattering, wide band, dual polarization and low scattering, and can meet the stealth requirement.

The application relates to the technical field of antennas and electromagnetic stealth, and particularly discloses a low-scattering antenna array based on an artificial magnetic conductor structure, which comprises an upper dielectric layer, an air layer and a lower dielectric layer arranged in sequence from top to bottom; a plurality of groups of patch units A and a plurality of groups of patch units B are arranged in an array on the upper surface of the upper dielectric layer; each group of patch units A comprises a plurality of groups of slotted cut patch units arranged periodically and having cut seams; each group of patch units B comprises a plurality of groups of common patch units arranged periodically; an upper microstrip feed line strip is arranged on the upper surface of the lower dielectric layer; a metal floor is arranged on the lower surface of the lower dielectric layer, the metal floor is provided with a lower strip-shaped gap corresponding to the upper microstrip feed line strip and a coaxial cable connected with the upper microstrip feed line strip. The application realizes the radiation and scattering integrated antenna array with wideband radiation performance and wideband low-scattering performance by the mechanism of the artificial magnetic conductor orthogonal reflection screen which utilizes the interference cancellation of reflected wave phase difference.

1. The name of the product of this design: solar radiation monitoring device. 2. Purpose of this design product: This design product is used to observe solar radiation data such as total solar radiation, direct radiation, scattered radiation, and sunshine duration. 3. The design key point of this appearance design product lies in the combination of shape and color. 4. The picture or photo that best illustrates the key points of the design: main view. 5. The design for which protection is sought includes color.

The invention discloses a low-scattering array antenna based on a dual-function unit and a collaborative arraying design, which belongs to the technical field of array antenna stealth design, and is characterized in that reference array units and dual-function units cooperatively form an array to form a 4 * 4 two-dimensional array antenna, and the array antenna has four rows along a co-polarization direction; wherein each of the first row and the fourth row is provided with four dual-function units, and each of the second row and the third row is provided with four reference array units. The reference array unit comprises a radiation patch, a dielectric layer and a metal floor which are sequentially arranged from top to bottom; and an L-shaped feed structure is arranged in the dielectric layer. The difference between the dual-function unit and the reference array unit is that the radiation patch of the dual-function unit is provided with three parallel straight slits, and the straight slits penetrate through the radiation patch. The array antenna designed by the invention has the advantages of integration of radiation and scattering, wide band, dual polarization and low scattering, and can meet the stealth requirement.

The application provides a kind of radiation scattering integrated array antenna and mounting method, belongs to array antenna technical field, solve some problems existing in traditional antenna RCS reduction technology;The application includes antenna radiator, feed component, power division layer and mounting bottom plate, the structure of the antenna radiator adopts band-stop FSS structure, the band-stop FSS structure is used to show band-stop characteristic in antenna operating frequency band;The feed component is used to make the antenna radiator and the power division layer vertical interconnection, the mounting bottom plate is used to carry the power division layer;The FSS structure that shows band-stop characteristic in antenna operating frequency band is used as antenna radiator in the application, and the array, feed and mounting mode of such antenna radiator are given, both the radiation of antenna and the effect of shielding in-band electromagnetic wave are realized in antenna operating frequency band, so as to reduce the scattering of antenna structure to in-band radar wave.

The invention provides a radiation and scattering integrated metasurface array design method and device, equipment and a medium. The method comprises the steps that a metasurface initial unit is established; constructing a reflection coefficient model of the metasurface initial unit, and optimizing the metal patch distribution of the metasurface initial model; adding a plurality of pixel patches, constructing a reflection coefficient model of the pixel patches to optimize the distribution of the pixel patches and the connection condition of ports between the pixel patches, and obtaining a radiation-scattering integrated metasurface unit; micro-strip lines are arranged on the two sides of the radiation-scattering integrated metasurface units, the radiation-scattering integrated metasurface units provided with the micro-strip lines are arranged in an array mode, and an initial radiation-scattering integrated metasurface array is obtained; constructing a radiation feed network; and optimizing the initial radiation-scattering integrated metasurface array to obtain the radiation-scattering integrated metasurface array. Under the condition that multiple functions are achieved, the high performance of the metasurface array is guaranteed, the integration level is improved, and the structural complexity is simplified.

This invention relates to a method of radiography of an organ of a patient, comprising: first vertical scanning and said second vertical scanning being performed synchronously, wherein a computed correction is processed on both first and second raw images, on at least part of patient scanned height, for at least overweight or obese patients, so as to reduce, between first and second corrected images, cross-scattering existing between said first and second raw images, and wherein said computed correction processing on both said first and second raw images comprises: a step (32, 33, 34) of making a patient specific modeling, using as patient specific data therefore at least both first and second raw images, preferably mainly both first and second raw images, more preferably only both first and second raw images, a step (34, 35) of determining a patient specific representation of radiation scattering by said patient specific modeling, a step (36) of processing said patient specific radiation scattering representation on both said first and second raw images so as to get said first and second corrected images.

This application relates to photoresist compositions. Specifically, it relates to photoresists that can be used in photolithography, particularly in the manufacture of integrated circuits and derivative products. The photoresist compositions of this application include anti-scattering components with a significant amount of porosity and therefore fewer scattering centers, thereby further limiting radiation scattering events during exposure. This anti-scattering effect can improve resolution by reducing common proximity effects associated with photolithography, thus allowing the fabrication of smaller, higher-resolution microchips. Furthermore, some embodiments include anti-scattering components directly linked to the photoresist components, which can improve overall photolithography chemistry, thus providing benefits in both resolution and photoresist sensitivity.

The invention provides a preparation method of a dust-free high-performance heat insulation board, which comprises the following steps: firstly, preparing an A-layer skin barrier film, and forming an elastic barrier film through coating and curing; secondly, preparing a C-layer backing reinforced prefabricated body, and compounding a fiber reinforced base material and a hot melting bonding component by utilizing a hot pressing technology; then, preparing a B-layer heat insulation core layer, compounding ZrO2 particles through aerogel matrix synthesis and functionalization treatment to improve the radiation scattering capability, and realizing a self-repairing function through an epoxy / anhydride reaction pair; and finally, assembling the three layers in a laminating manner and performing hot-pressing composite molding. According to the method, an aerogel matrix is compounded with ZrO2 particles, so that the heat conductivity is effectively reduced, the heat insulation performance is improved, and the material is endowed with good radiation isolation capability and a self-repairing function. The heat insulation plate is obviously superior to a traditional heat insulation material, has high long-term stability and reliability and is suitable for the field of high-temperature equipment with strict requirements.

The utility model relates to the technical field of medical instruments, in particular to a visible double-airbag trachea cannula, one end of an outer cannula of the trachea cannula is a far end, the other end of the outer cannula of the trachea cannula is a near end, and the outer surface of the outer cannula of the trachea cannula is coated with a radiation scattering coating. The radiation scattering coating is used for detecting reflection of radiation on the outer surface of the trachea cannula outer sleeve through radiation visualization equipment; the far end of the trachea cannula outer cannula is provided with an air bag, the near end of the trachea cannula outer cannula is connected with an inflation tube, the air bag comprises a first air bag and a second air bag, and the inflation tube comprises a first inflation tube and a second inflation tube. The inflation tube is connected with the air pressure indicating saccules, and the air pressure indicating saccules comprise the first air pressure indicating saccule and the second air pressure indicating saccule. The air pressure indicating balloon is connected with the inflation valve; the inflation valve is used for inflating the air bag. The outer surface of the trachea cannula outer sleeve 1 is coated with the radiation scattering coating to achieve visualization so as to observe the form of the trachea cannula, and meanwhile the double air bags are arranged to prevent the situation that the inner wall of the trachea is pressed for a long time due to fixing of a single air bag.

This invention provides a system and method for online measurement and feedback calibration of electron irradiation dose, relating to the field of automation control technology. It includes: a processing module for converting the raw dose signal into a five-channel digital reading sequence, and performing timestamp alignment and spatial coordinate calibration on the five-channel digital reading sequences to generate a three-dimensional discrete coordinate dataset characterizing the spatial distribution of radiation field intensity; and an extraction module for identifying the global maximum radiation intensity point from the three-dimensional discrete coordinate dataset as the spatial registration origin, extracting two characteristic lines characterizing the dominant radiation scattering direction, and calculating the spatial azimuth angle between the two characteristic lines to determine the main influence area of ​​radiation scattering. This invention achieves accurate processing of the raw dose signal, scientific positioning of the radiation influence area, and construction of a dynamic compensation model through multi-module collaboration. It can output high-confidence dose values ​​and complete feedback calibration based on time-series drift trends, effectively ensuring the accuracy and reliability of online electron irradiation dose measurement.

The invention relates to a metasurface Fabry-Perot resonant cavity antenna with a tunable RCS (radar cross section). The metasurface Fabry-Perot resonant cavity antenna sequentially comprises a coaxial line feed structure, a metal reflection bottom plate, a lower dielectric substrate, a middle air layer and a partial reflection layer dielectric substrate from bottom to top, the lower dielectric substrate is integrated with a square patch array and a central radiation structure, and coaxial line feed is coupled with the lower dielectric substrate; a metasurface array and a pin tube are arranged on the upper surface of the partial reflection layer substrate, a partial reflection layer patch array is arranged on the lower surface of the partial reflection layer substrate, and the middle air layer, the reflection bottom plate and the partial reflection layer form a Fabry-Perot resonant cavity. The 0-300 ohm dynamic impedance regulation RCS is realized through the radial pin tubes, and the radiation performance is prevented from being influenced by the design that no pin tube is arranged in a central region. According to the design, the RCS reduction amount is continuously adjustable in the frequency band of 6-12 GHz, the height of the antenna is reduced by 40%, the problems of RCS fixation and radiation scattering conflict of a traditional antenna are solved, and the stealth adaptability and survivability of equipment are improved.

Disclosed are methods for minimizing x-ray scattering artifacts, the method comprising: contacting an object with an x-ray scattering mitigation material. The contacting can comprise coating the x-ray scattering material on the object, including spraying a solution of suspension of an x-ray scattering mitigation material onto the object or dry powder coating the object with a x- ray scattering mitigation material. Alternatively, the contacting can comprise immersing the object in a fluid comprising the x-ray scattering material. The fluid can be a gas, a liquid, or a gel. The disclosed x-ray scattering mitigation material can be optimized for mitigating Compton radiation scattering or for mitigating Rayleigh radiation scattering. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present disclosure.

The utility model provides a kind of low RCS metasurface antenna of radiation scattering integration belongs to microwave antenna technical field, including from top to bottom sequentially arranged radiation scattering integrated metal structure, varactor diode loaded on radiation scattering integrated metal structure, first dielectric substrate, metal ground plane, second dielectric substrate and microstrip transmission line, radiation scattering integrated metal structure, metal ground plane and microstrip transmission line cooperate to realize radiation, radiation scattering integrated metal structure and varactor diode cooperate to realize scattering regulation and control.The antenna designs metasurface scattering unit and antenna radiation patch under the same aperture plane, realizes good radiation performance and scattering regulation and control performance;By adjusting the capacitance of varactor diode, the reflection phase when metasurface antenna unit is used as scatterer is regulated and controlled.By reasonable array arrangement, the in-band main polarization RCS when antenna array is terminated with matching load can be further reduced.

The application discloses a low-scattering array antenna based on a dual-function unit and a cooperative array design, belongs to the technical field of array antenna stealth design, and is formed by cooperatively arranging reference array units and dual-function units to form a 4*4 two-dimensional array antenna, which has four rows along the same polarization direction; wherein, the first row and the fourth row are each provided with four dual-function units, and the second row and the third row are each provided with four reference array units. The reference array unit comprises, from top to bottom, a radiation patch, a dielectric layer and a metal ground plate; the dielectric layer is provided with an L-shaped feeding structure. The difference between the dual-function unit and the reference array unit is that the radiation patch of the dual-function unit is provided with three straight slits parallel to each other, and the straight slits penetrate through the radiation patch. The array antenna designed by the application has the advantages of radiation scattering integration and wide-band dual-polarization low scattering, and can meet the stealth requirement.

The invention discloses a super-homogeneous radiation-scattering collaborative super-structure array plane for large-angle strong scattering suppression. The array plane is composed of a plurality of radiation-scattering collaborative super-structure units which are arranged in a super-homogeneous mode. A U-shaped groove patch antenna and a loss layer of a loading resistor are combined to form a super-structure unit with functions of regulating radiation and scattering, and all the units are arranged by adopting super-homogeneous distribution. By means of the design, good in-band radiation performance is kept, and meanwhile out-of-band scattering under the grazing incidence condition is effectively restrained. The super-homogeneous radiation-scattering synergistic super-structure array plane has the characteristics close to an ideal periodic array, avoids the common Bragg peak phenomenon in the periodic array, and is similar to a random distribution array without Bragg peaks. The super-homogeneous radiation and scattering synergistic super-structure array plane provides a new design idea for stealth application of a periodic / non-periodic antenna array in a grazing incidence condition in the future, and has a wide application prospect, especially in the technical field of equipment stealth and low scattering.

The invention concerns a system for controlling pest infestation of crops, comprising one or more light sources that are particularly arranged in a grid like pattern, wherein the one or more light source is configured to emit UV radiation in a direction substantially different to a radiation direction for crop growth. A fog generator is configured to produce fog in a first volume covered by the UV radiation emitted by the one or more light sources, where the produced fog comprises a specified density and a specified range of droplet size; said fog scattering UV radiation emitted by the one or more light sources towards the crops. The first volume is distanced from the one or more light sources.