18 results about "Antenna radiation patterns" patented technology

The low-profile vehicle-mounted antenna comprises a PCB monopole antenna, the PCB monopole antenna comprises a board body, antenna radiation patterns are arranged on the front face and the back face of the board body respectively, the board body directly feeds through a cable, and a printing grounding structure is arranged on the board body, forms electromagnetic coupling with the cable and is used for expanding the bandwidth of the antenna. According to the low-profile vehicle-mounted antenna, the antenna radiation patterns are arranged on the two sides of the plate body respectively, so that a low-profile flat structure is achieved, and the height of the antenna is reduced. And meanwhile, by reasonably utilizing the coupling effect of the cable and the printed grounding structure on the radiation patch, the bandwidth of the antenna is expanded, and the full-band stable performance is realized. And direct feeding is realized through the cable without an additional and complex feed network, so that the effects of simplifying the structure and reducing the cost are achieved.

This document describes a waveguide with radiation slots and parasitic elements for asymmetrical coverage. An apparatus may include a waveguide for providing asymmetrical coverage in an azimuth plane. The waveguide includes a hollow channel containing a dielectric and an array of radiation slots through a surface that is operably connected with the dielectric. The waveguide includes an array of parasitic elements positioned on or in the surface and offset from a longitudinal side of the array of radiation slots. The radiation slots and parasitic elements configure the described waveguide to focus an antenna radiation pattern that provides an asymmetrical coverage to focus on a particular portion within the antenna field-of-view.

The application discloses a satellite-borne wide-beam circularly polarized antenna with beam equalization and a satellite, and relates to the technical field of antennas.The antenna comprises a conical horn body, a partition type circular polarizer, a feeding port and an insulating base which are sequentially connected.The conical horn body is a conical structure with an umbrella-shaped metal radiation director, and the asymmetry of the traditional horn antenna directional diagram is effectively solved through multi-mode excitation of the circular polarizer, so that the beam equalization characteristic is realized.The loaded dielectric material is polytetrafluoroethylene, the mouth surface radius of the horn is equivalently reduced through dielectric loading, and the directional diagram beam width is widened.The partition type circular polarizer is adopted to realize good circular polarization effect.Through the joint action of the base and the umbrella-shaped metal radiation director, the interference of the antenna mounting surface on the wide-beam antenna radiation diagram is reduced, the requirement of the antenna on the mounting environment is lowered, the wide-beam circularly polarized radiation and reception of the antenna can be effectively realized, and the antenna has the advantages of wide beam, beam equalization and low axial ratio.

The invention discloses a satellite-borne wide-beam circularly polarized antenna with equalized beams and a satellite, and relates to the technical field of antennae, the antenna comprises a conical horn body, a partition plate type circular polarizer, a feed port and an insulating base which are connected in sequence; the conical horn body is of a conical structure with an umbrella-shaped metal radiation director, the asymmetry of a traditional horn antenna directional diagram is effectively solved through multi-mode excitation of the circular polarizer, and the wave beam equalization characteristic is achieved; the loaded dielectric material is polytetrafluoroethylene, the aperture radius of the horn is equivalently reduced through dielectric loading, and the beam width of a directional diagram is broadened; a partition plate circular polarizer is adopted, so that a good circular polarization effect is achieved; through the combined action of the base lifting antenna and the umbrella-shaped metal radiation director, the interference of an antenna mounting surface on a wide-beam antenna radiation pattern is reduced, the requirement of the antenna on a mounting environment is reduced, wide-beam circular polarization radiation and receiving of the antenna can be effectively realized, and the antenna has the advantages of wide beam, beam equalization and low axial ratio.

A wireless signal apparatus and a wireless signal detection are provided. The wireless signal apparatus comprises an antenna apparatus. The antenna apparatus comprises a transmitting antenna array and a receiving antenna array arranged in a first plane. The antenna apparatus forms a narrow-beamwidth antenna radiation pattern, the narrow-beamwidth antenna radiation pattern forms a flattened detection area, and the flattened detection area forms a second plane substantially perpendicular to the first plane. The wireless signal apparatus is configured to detect spatial information of an external object within the flattened detection area, and the spatial information comprises only two-dimensional spatial information in the second plane.

A test apparatus (14) for testing an antenna under test (16) has a measurement device (26), a turntable (24) and at least one stationary probe antenna (28). The measurement device (26) is a multi-channel measurement device, wherein the turntable (24) comprises a first portion (36), a second portion (38), a first rotatable RF joint (44) and a holding section (34), wherein the second portion (38) is attached rotatably to the first portion (36), and the first rotatable RF joint (44) provides a rotatable RF path between the first portion (36) and the second portion (38). The measurement device (26) and the holding section (34) are arranged spatially fixed with respect to each other at the second portion (38) of the turntable (24), and wherein the at least one stationary probe antenna (28) is electrically connected to the measurement device (26) for transmission of RF signals via the first rotatable RF joint (44). Further, a test setup (10) and a method are provided.

This invention provides a near-field array antenna pattern generation method and system based on convex optimization, belonging to the field of array antenna design technology. In a computer-aided design environment, the near-field target region is discretized into an observation network, and the array feeding system is abstracted into a feeding network composed of nodes and cables. A deterministic field strength mapping relationship is established between the two, and the main lobe and sidelobe requirements of the target pattern are transformed into upper and lower bound constraints on the field strength amplitude at the observation points. With the goal of minimizing the implementation complexity of the feeding network and the condition of satisfying all field strength constraints, the physical interconnections and cable parameters of the network are expressed as topological parameters. A convex optimization problem is constructed and solved to obtain the optimal topological parameters. Finally, detailed construction drawings of the feeding network are automatically generated based on these parameters, and electromagnetic simulation is used to verify whether the actual field strength meets the preset constraints, thereby completing the integrated design from performance indicators to manufacturing hardware solutions.

It is determined that a request has been received to make a change in a radiation pattern of an antenna coupled to a Citizens Broadband Radio Service Device (CBSD) from a first radiation pattern to a second radiation pattern. A registration object associated with the CBSD maintained by a spectrum access system (SAS) is obtained. A new radiation pattern characteristic of the second radiation pattern that is different from an existing radiation pattern characteristic of the first radiation pattern is determined. A new registration object that includes the new radiation pattern characteristic and omits the existing radiation pattern characteristic is generated. The new registration object is caused to be stored by the SAS in lieu of the registration object.

The invention relates to the technical field of wireless communication, in particular to a coupling error calibration optimization method and system for a radiation pattern of a phased-array antenna. The method comprises the following steps: setting an expected directional diagram, and abstracting the expected directional diagram into a gate function; defining a main lobe region of the expected directional diagram, and presetting an upper limit for a side lobe region; obtaining an active directional diagram of each array element, and extracting a gain curve and a phase curve of the active directional diagram; initializing phased array excitation, and calculating an initial directional diagram; adjusting the sidelobe level amplitude of the initial directional diagram through a window function, and adjusting the beam width to a defined main lobe region; carrying out FFT (Fast Fourier Transform) on the adjusted directional diagram to solve an excitation vector, and calculating a first fitting directional diagram result; and setting a performance function to judge the performance, if the performance function is smaller than a threshold value, outputting a corresponding excitation vector, otherwise, repeating the operation until the performance function is smaller than the threshold value or the number of iterations is reached. According to the invention, high-efficiency phased array radiation pattern calibration can be realized under the condition that coupling errors among array elements are considered, and specific beam forming is realized.

A method and system for measuring an antenna radiation pattern of a harvester antenna printed on a substrate of an Internet of Things (IoT) tag are disclosed. The method includes sweeping a power level of a source radio frequency (RF) signal transmitted at a particular direction, wherein the source RF signal is received by the harvester antenna; measuring a transmission rate of signals transmitted by the IoT tag, wherein the transmission rate is proportional to the power level of a source RF signal received by the harvester antenna; determining if the measured transmission rate is substantially equal to a predefined threshold; registering, at each measured direction, a power level of a signal reaching a transmission rate is substantially equal to the predefined threshold; and plotting the antenna radiation pattern based on the registered power levels.

The utility model relates to the technical field of wireless communication, in particular to a 5G CPE antenna with a high Hertz frequency band. The antenna comprises a PCB, a radio frequency line, a first radiating body and a second radiating body, the first radiating body and the second radiating body are laid on the two sides of the PCB, the first radiating body and the second radiating body are oppositely arranged and form symmetrical dipoles, and feeding points are arranged at the opposite positions of the first radiating body and the second radiating body respectively. One end of the radio frequency line is respectively connected with the feeding points of the first radiator and the second radiator, and the first radiator and the second radiator are provided with notch slots for adjusting impedance. According to the utility model, the PCB board and the radio frequency cable line are used to realize 3300 MHz to 5 GHz. The antenna is made into a PCB structure, so that the antenna can be conveniently assembled on machinery equipment, passive efficiency gain is provided for the radiator structure of a dual machine, and the design of the notch and the slot position at the corresponding position enables the radiation pattern of the antenna to be better than that of a conventional antenna.

In one example, a method performed by a processing system including at least one processor includes creating a geospatial model of an environment in which a cellular network is to be deployed, transforming, for each cellular antenna of a proposed antenna layout of the cellular network, a radiation pattern of the each cellular antenna into a signal strength array, to create a plurality of signal strength arrays, augmenting, for each signal strength array of the plurality of signal strength arrays, the each signal strength array with at least one parameter of a corresponding cellular antenna of the proposed antenna layout and at least one value describing the environment in which the cellular network is to be deployed, and estimating a coverage of the proposed antenna layout based on the signal strength array, as augmented, using a machine learning model.

The invention discloses a far-field antenna radiation pattern determination method and device, equipment, a storage medium and a product, and relates to the technical field of data processing, and the far-field antenna radiation pattern determination method comprises the steps: obtaining near-field amplitude phase data obtained through near-field antenna radiation measurement, the near-field amplitude phase data comprises an actual measurement point of near-field antenna radiation measurement and amplitude phase data corresponding to the actual measurement point; determining target amplitude phase data of a target sampling point in the near-field scanning range based on the near-field amplitude phase data; and determining a far-field antenna radiation pattern according to the target amplitude phase data. According to the invention, the actual measurement point and the amplitude phase data corresponding to the actual measurement point are acquired, and then the target amplitude phase data of the target sampling point is determined according to the amplitude phase data, so that the far-field antenna radiation pattern is determined. The problem that the radiation pattern of the far-field antenna is inaccurate due to the deviation between the actual sampling position and the theoretically calculated position can be avoided.

This invention discloses a method for constructing a space brightness temperature radiation model for on-orbit satellite antennas, specifically in the field of remote sensing measurement. It completes multi-coordinate system transformation of antenna radiation patterns; preprocesses cold-space brightness temperature mapping data, and constructs a cold-space radiation background database by combining piecewise binary linear interpolation and linear fitting. Based on brightness temperature thresholds, the Milky Way region is identified, and the upper and lower boundaries are solved by fitting the center line of the Milky Way strip using weighted least squares, thus establishing a Milky Way brightness temperature strip model. A land-sea segmentation model is used to classify land and sea using latitude and longitude coordinates, generating surface brightness temperature data. A standardized surface brightness temperature background database is constructed through interpolation and surface fitting. The spatial pointing of each radiometer beam is determined; surface-pointing beams are matched with surface brightness temperature data, while non-surface-pointing beams use cold-space background data to solve for the spatial brightness temperature of each beam, generating a satellite antenna background radiation value vector. The antenna brightness temperature integral effect is numerically calculated using the brightness temperature integral formula, completing the overall construction of the space brightness temperature radiation background model.

Conventional RFID antennas using flat patch antennas, when used in the UHF band, experienced a concentration of current at the edges of the antenna pattern due to the skin effect, with almost no current flowing elsewhere. As a result, a strong electromagnetic field was generated at the edges of the antenna pattern, but only a weak electromagnetic field was generated in the center, leading to the problem of poor communication with RFID tags in the center of the antenna. [Solution] An RFID antenna 6 for communicating with an RFID tag, wherein a conductive pattern 25 made of metal foil is arranged on a substrate 21, and the conductive pattern includes meander shapes.

This invention provides an automatic identification method and system for logistics sorting carts based on RFID, belonging to the field of automated intelligent logistics sorting technology. The method includes: Step 1, collecting radio frequency signals from RFID tags on passing carts in real time using UHF RFID readers deployed at sorting line entrances, turning points, and sorting grids to obtain raw signal data; preprocessing the raw signal data to obtain preprocessed signals; Step 2, constructing a three-dimensional virtual reading field model based on the antenna radiation pattern, installation height, and tilt angle parameters of each reader. The model is an irregular ellipsoid formed by fitting the coverage area of ​​each reader. This invention achieves precise binding between cart identity and physical location, ensuring accurate execution of sorting actions in a single operation.

This application relates to a method and system for determining the beam footprint of a satellite phased array antenna. The method includes: establishing a first coordinate system with the antenna's geometric center as the origin, a second coordinate system with the Earth's center as the origin, a third coordinate system representing the radiation angles of the phased array antenna's radiation pattern, and a fourth coordinate system representing the antenna beam footprint on the Earth's surface; obtaining multiple antenna azimuth and elevation angles in the third coordinate system, and obtaining the gain value corresponding to each combination of antenna azimuth and elevation angles; mapping each combination of antenna azimuth and elevation angles to the fourth coordinate system based on the satellite's orbital altitude and the Earth's radius to obtain multiple combinations of surface azimuth and elevation angles; compensating for the gain value based on the path loss factor to obtain the surface gain value; and determining the antenna beam footprint in the fourth coordinate system based on the surface azimuth and elevation angles and the corresponding surface gain values, thereby enabling accurate determination of the antenna beam footprint.

The invention discloses a spacecraft autonomous attitude determination method based on natural celestial body radio radiation, and the method comprises the steps: firstly obtaining a noise signal of the radio radiation of a natural celestial body, and calculating the attitude of a spacecraft based on the noise signal, a pre-stored antenna pattern, and a solar ephemeris. The method can be used as a backup attitude determination scheme under extreme conditions of sensor faults and the like, does not depend on manually transmitted navigation signals, is not afraid of strong light interference, and is high in reliability and good in robustness.