91 results about "Radiation pattern" patented technology

The application relates to the field of wireless communication and sensing technology, and particularly discloses a two-dimensional antenna array multi-beam scanning method based on holographic amplitude weighting, which comprises the following steps: determining the position information of each radiation unit in the two-dimensional antenna array, including calculating the unit spacing and arrangement mode; generating the amplitude weighting value of each radiation unit according to the target wave direction; using the two-dimensional multi-beam holographic amplitude weighting technology, the amplitude weighting value of the radiation unit is determined through the two-dimensional multi-beam holographic amplitude weighting technology; generating the corresponding binary discretization coding sequence based on the amplitude weighting value to control the excitation amplitude of each radiation unit; designing a Ka-band two-dimensional holographic beam scanning leaky-wave antenna square array based on liquid crystals, and the radiation pattern of the two-dimensional antenna array is regulated and controlled through the coding sequence to realize multi-beam scanning.

This application provides an antenna performance evaluation method and apparatus, addressing the problem in existing technologies where larger scattering objects require larger testing environments when the scattering object is significantly larger than the individual antenna. The antenna performance evaluation method includes the following steps: acquiring the radiated electric field measurement results of a single antenna; determining a hypothetical planar electromagnetic field distribution by performing spherical electromagnetic field mapping; calculating the surface electromagnetic field distribution of the single antenna using a backward inversion method based on the hypothetical planar electromagnetic field distribution; and calculating the radiation pattern of the single antenna in the presence of the scattering object based on the surface electromagnetic field distribution and the properties of the scattering object. An apparatus for implementing the above method is also provided. This application eliminates the need to place large scattering objects in an anechoic chamber, requiring only radiated electric field measurements of the individual antenna, significantly reducing the demand for testing space.

This invention discloses a miniaturized, ultra-wideband, dual-polarized antenna based on non-uniform planar loading, comprising a first layer, a second layer, and a third layer arranged sequentially from top to bottom. The first layer is a non-uniform planar structure composed of four types of elements, used to improve high-frequency beam splitting. The second layer is a radiator structure consisting of two pairs of orthogonally placed magnetoelectric dipoles. The third layer is a reflector cavity composed of a planar metal reflector and a vertically loaded metal plate. This invention discloses a miniaturized, ultra-wideband, dual-polarized antenna based on non-uniform planar loading. By using the non-uniform planar structure loaded at the top of the antenna radiator, the high-frequency anti-phase currents of the electric dipole arms are modulated into in-phase currents, suppressing higher-order modes and refocusing the split beam, thereby obtaining a stable, high-gain radiation pattern throughout the entire ultra-wideband frequency range.

The present invention provides an antenna module capable of improving the angular range of the radiation pattern. [Solution] The antenna module includes a main radiator, a supply radiator, first and second ground radiators, a first inclined radiator, and a pattern adjustment radiator. The main radiator includes a first open end. The supply radiator, the first and second ground radiators, and the first inclined radiator are flexibly connected to the main radiator. The first inclined radiator has a second open end away from the main radiator, is located on the opposite side of the first ground radiator and the supply radiator, and forms a first angle with the normal direction of the main radiator. The second ground radiator is located on the opposite side of the first open end. The pattern adjustment radiator is located near the first open end, spaced away from the first open end, and includes a matching radiator and a second inclined radiator, the matching radiator being close to the first open end, and the second inclined radiator forming a second angle with the normal direction.

This invention provides a method and system for modeling sea clutter in a multi-channel spaceborne bistatic radar, including: solving the spaceborne-sea geometric relationship; calculating the two-way radiation pattern of the spaceborne bistatic radar antenna; modeling the time-varying motion of the sea surface; calculating the bistatic scattering coefficient of sea clutter; and synthesizing the multi-channel sea clutter echo of the spaceborne bistatic radar. This invention can achieve high-precision modeling of multi-channel sea clutter for spaceborne bistatic radar under different bistatic configurations and system parameters, overcoming the problems of existing models that do not consider the internal motion of multi-channel sea clutter in spaceborne bistatic radar, and do not consider the influence of different polarization modes and azimuth bistatic angles on the bistatic sea clutter scattering coefficient.

This invention provides a beamformer-based feed design method. By utilizing a pattern synthesis method based on Fourier transform, the excitation amplitude and phase of each array element are obtained through inverse synthesis. The obtained excitation amplitude and phase of each array element are then assigned to that element. Full-wave simulation of the array is performed in electromagnetic simulation software to obtain the array's radiation pattern, which is compared with the desired feed radiation pattern. If deviations exist, the excitation amplitude and phase can be adjusted until the overlap with the desired feed radiation pattern reaches the target. This invention achieves nearly 90% efficiency after illuminating the reflector, far exceeding the efficiency of conventional feeds illuminating reflectors. Furthermore, different excitation coefficients can be flexibly constructed for different frequencies, achieving high-precision approximation of the ideal delta function across a wide frequency range. Higher gain can be obtained with the same aperture, or the aperture size of the reflector antenna can be reduced with the same gain requirements. This significantly improves system performance and reliability.

This invention discloses a multi-beam transmissive and reflective integrated metasurface beamforming method and system, comprising: determining a target radiation pattern and converting it into a target mask; initializing metasurface units based on the principle of equal distribution of radiated power to obtain initial weights for transmission and reflection; obtaining a normalized three-dimensional radiation pattern of the units, mapping the initial weights to generate transmission and reflection radiation patterns; applying amplitude constraints to the radiation pattern using the target mask to obtain an ideal transmissive and reflective radiation pattern; obtaining reconstructed transmissive and reflective weights through inverse mapping and amplitude limiting, and outputting physical control commands after iterative correction. This invention solves the technical defects of difficult precise allocation of multi-beam energy, slow convergence speed of weight mapping, and difficulty in obtaining optimal physical control commands, achieving high-precision and flexible control of transmissive and reflective energy in the entire space, enhancing the convergence stability in the three-dimensional radiation pattern reconstruction process, and improving the automation and intelligence level of metasurface physical control command generation.

A microstrip antenna which includes a substrate, a microstrip patch configured on a first side of the substrate, a ground configured on a second side of the substrate which is opposite to the first side, and a first shorting wall extending from a side of the microstrip patch toward the ground. The first shorting wall substantially overlaps with the substrate on a direction that is perpendicular to the microstrip patch. The first shorting wall is located at a first non-radiating edge of the microstrip antenna. Dummy elements are no longer needed in this design, which makes it compact.

A compression driver for an omnidirectional loudspeaker includes a motor assembly and a dome diaphragm coaxially disposed above and operably connected to the motor assembly, the diaphragm having a convex surface and a concave surface. The compression driver includes a phase plug having a top portion and a bottom portion, the bottom portion having a concave bottom surface disposed adjacent to the convex surface of the diaphragm and defining a compression chamber therebetween. The phase plug includes a plurality of conduits extending through the bottom portion for sound wave travel and converging to form an annular outlet, the top portion including a plurality of radially expanding channels acoustically connected to the annular outlet. Actuation of the diaphragm by the motor assembly generates sound waves within the compression chamber, the sound waves traveling through the annular outlet and the radially expanding channels to produce a generally horizontal 360° radiation pattern of sound waves from the compression driver.

The application discloses a heart-shaped broadband circularly polarized patch antenna, which comprises a dielectric substrate, a heart-shaped radiation patch, a microstrip feed line and a ground plate. A characteristic mode analysis method suitable for irregular geometric shapes is proposed, that is, a plurality of non-orthogonal characteristic modes are used to realize a broadband circularly polarized antenna. The application has the advantages of simple structure, beauty, compactness, simple feed mode, wide impedance and axial ratio bandwidth, and stable radiation pattern. The new method has clear physical mechanism, simple steps and wide application prospect.

The application discloses a wide-band hat-type feed antenna and belongs to the technical field of satellite communication antennas. The method adopts a light-wall shaped horn loaded with an outer corrugated slot and a choke slot, improves horn and space matching, realizes expansion of a frequency band from 1.6:1 to 2.8:1, loads a slot at the horn mouth and the edge of the choke slot, realizes equalization characteristics of a feed radiation pattern, adopts a small-size sub-reflector to reduce shielding of the reflector, loads double choke slots in the reflector, reduces diffraction of the sub-reflector, and improves antenna radiation efficiency, and uses spline parameterization of the sub-reflector and the main reflector to realize integrated optimization design, so that the frequency bandwidth of the traditional hat-type feed is expanded, and good side lobe and efficiency performance are realized.

Techniques for wireless communications are disclosed. In an aspect, a receiving entity receives information characterizing a set of positioning signals to be transmitted by a transmission-reception point (TRP) using a set of transmit beams, the information including at least one antenna element radiation pattern, at least one antenna element array configuration, and, for each beam of the set of transmit beams, information identifying at least one precoding matrix. The receiving entity performs measurements of the positioning signals transmitted by the TRP and computes at least one positioning measurement estimate based on at least some of the at least one antenna element radiation pattern, the at least one antenna element array configuration, the information identifying at least one precoding matrix, and the positioning measurements. The receiving entity transmits positioning information to the TRP. The positioning information can include the at least one positioning measurement estimate.

An antenna unit, an antenna system, an antenna array, an antenna array system and a communication device relate to the technical field of communication. The antenna unit comprises at least two radiating elements and at least two feeders which are electrically connected one by one, so that the antenna unit generates at least two signals which can be superimposed, each feeder forms a single feed point on a single radiating element connected therewith, and the orthographic projection of one feed point on the other radiating element is located on the line or the extension of the line connecting the center point of the other radiating element and the feed point, so that the polarization directions of the at least two signals generated by the at least two radiating elements are the same, which ensures that the at least two signals can be stably superimposed, and further ensures the stable adjustment of the radiation pattern of the antenna unit.

This invention proposes a method and apparatus for synthesizing array radar radiation patterns using space-time joint modulation. The method includes: determining initial values ​​of the array radar element excitation coefficients; acquiring the array far-field radiation pattern under the influence of the initial values ​​of the element excitation coefficients; dividing the array far-field radiation pattern into main lobe and side lobe regions based on its characteristics; setting the random modulation phase of the main lobe region to zero, maintaining the same main lobe phase across different pulses, while modulating the phase of the side lobe region regularly or randomly, while keeping the array far-field radiation pattern amplitude constant, thus obtaining array radiation patterns with different phase characteristics under multiple pulses; performing Fourier transforms on the array radiation patterns under different pulses to obtain the space-time two-dimensional element excitation coefficients; and applying the space-time two-dimensional element excitation coefficients to the array radar system to synthesize the array radar radiation pattern after space-time joint modulation. This invention significantly improves the array radar's resistance to sidelobe clutter and interference.

The advent of fifth generation technology systems leads to seamless connectivity requirements for IoT-based applications. High frequencies of operation lead to inherent problem of path loss, and to mitigate designing of passive reflecting intelligent surfaces for practical operations are challenging. This disclosure relates a method to enable sectoral area coverage under network applications by topologically modulated reflecting intelligent surfaces. A Minkowski-shaped fractal unit cell is received as an input. The Minkowski-shaped fractal unit cell is characterized to obtain unit cell dimension with independent reflection-phase characteristics. The independent reflection-phase characteristics are utilized to identify distinct unit cell elements. Surface layouts are generated by the distinct unit cell elements. The surface layouts are characterized with respect to an incoming source radiation pattern to identify reflected radiation pattern parameters. The real-time sectoral signal coverage is designed based on the reflected radiation pattern parameters of the surface layouts and position of Ku-band horn antennas.

Omnidirectional Antenna and Associated Naval Platform The present invention relates to an omnidirectional antenna (10) comprising: - a base structure (12) extending along a first axis (Z) and defining in each cross-section an N-sided polygon, the base structure (12) further defining N faces (16) arranged around the first axis (Z); - a unit antenna array (14) comprising N unit antennas (20), each unit antenna (20) being arranged on one of the N faces of the base structure (12); the unit antennas (14) defining the same radiation pattern. Figure for the abstract: Figure 1

This application discloses an antenna assembly and a network device, relating to the field of antenna technology. The aim is to improve the performance of the antenna assembly. Specifically, the antenna assembly includes a monopole antenna for radiating electromagnetic waves at a first center frequency and a second center frequency. The monopole antenna includes a first stub and a second stub. The first stub is connected to a signal line. The second stub includes a main arm, two first arms, and two second arms. One end of each first arm is connected to the main arm, and one end of each second arm is connected to the main arm. The main arm is connected to a ground wire. The length of the first arm is 0.35 to 0.55 times λ1, where λ1 is the dielectric waveguide wavelength corresponding to the first center frequency; the length of the second arm is 0.45 to 0.65 times λ2, where λ2 is the dielectric waveguide wavelength corresponding to the second center frequency. This antenna assembly can improve the stability of multi-link operation in WiFi 7 systems and optimize the radiation pattern.

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.

A communication device includes a non-conductive track, an antenna element, a first rotating wheel, and a second rotating wheel. The antenna element is disposed on the non-conductive track. The first rotating wheel and the second rotating wheel drive the non-conductive track according to a control signal to adjust a position of the antenna element. The communication device can provide a nearly omnidirectional radiation pattern.

A vehicle-mounted system may include a first plurality of antennas, a second plurality of antennas, and one or more circuits configured for handling signals transmitted and / or received via the first plurality of antennas and the second plurality of antennas. At least two antennas of the first plurality of antennas have antenna patterns in different directions. At least two antennas of the second plurality of antennas have antenna patterns in different directions. At least one antenna of the first plurality of antennas and at least one antenna of the second plurality of antennas have antenna patterns in a same first direction. At least one other antenna of the first plurality of antennas and at least one other antenna of the second plurality of antennas have antenna patterns in a same second direction that is different than the first direction.

This invention discloses an RFID force sensing and positioning tag based on a biomimetic fingerprint structure, belonging to the field of wireless sensing technology. The tag includes an antenna layer, a skin-like structure layer as a substrate, a fingerprint-like ridge structure layer, and an RFID chip. The skin-like structure layer is located between the antenna and the fingerprint-like ridge structure layer, and the antenna layer is attached to the lower surface of the skin-like structure layer; multiple structural breakpoints are distributed on the antenna layer. When an external surface force is applied, the fingerprint-like ridge structure layer generates a micro-lever effect, amplifying the force and transmitting it to the antenna layer, causing a change in the overall impedance of the antenna to encode the magnitude of the force; simultaneously, local deformation at specific structural breakpoints tends towards an open-circuit state, causing a shift in the radiation pattern to encode the position of the force. This invention achieves high-precision two-dimensional surface force synchronous sensing and positioning with zero power consumption and low cost, without the need for doping with force-sensitive materials, and has significant application prospects and promotional value.

There is provided a computer-implemented method of designing a transmitarray antenna (TA), which includes configuring a transmitarray antenna (TA) including a feeding source, an antenna array, and a loading superstrate, deriving a desired radiation pattern of the feeding source to generate a uniform distribution on a TA aperture, and designing a beam-shaped feeding source based on the derived desired radiation pattern.

A reconfigurable antenna and a communication device having the reconfigurable antenna include a substrate, a first electrode layer, a second electrode layer, a conductor, two ground wires, and two switches. The substrate has a first surface, a second surface, and a slot penetrating both surfaces. The first electrode layer has a first groove passing through the slot. The second electrode layer has a second groove passing through the slot. The conductor is located within the slot. The two ground wires are located on opposite sides of the first electrode layer. The two switches are located between the first electrode layer and the ground wires. When each switch is connected to its corresponding ground wire, the antenna forms an omnidirectional radiation pattern; when each switch is disconnected from its corresponding ground wire, the antenna forms a directional radiation pattern.

A 2-70GHz ultra-wideband, all-metal Vivaldi antenna includes a metal plate with a supporting base plate at its bottom. A coaxial connector passes through the supporting base plate and connects to the metal plate. An exponentially tapered curve opening is formed on the upper inner side of the metal plate, and a matching circle is formed on the lower part of the metal plate. An inclined slot is formed on the metal plate between the exponentially tapered curve opening and the matching circle. The starting end of the exponentially tapered curve opening is connected to one end of the inclined slot, and the other end of the inclined slot is connected to the matching circle. The inner conductor of the coaxial connector contacts the upper surface of the end where the inclined slot and the matching circle are connected. Traditionally designed Vivaldi antennas rarely operate at frequencies of 40GHz and above. This Vivaldi antenna, by optimizing the thickness of the Vivaldi metal plate, allows the antenna sample to operate at frequencies greater than 70GHz with a return loss exceeding 10dB. This invention features a simple structure, low cost, ultra-wideband capability, and stable radiation pattern.

This invention discloses a path loss modeling method for RIS-assisted communication systems, comprising: establishing a three-dimensional coordinate system with the RIS center as the coordinate center, and constructing a path loss model dataset; setting the adjustment step size to s, and dividing the RIS electromagnetic unit into regularly sized RIS electromagnetic blocks; constructing a joint normalized power radiation pattern of the transmitting antenna, RIS electromagnetic blocks, and receiving antenna; constructing the total phase change term of the signal after reflection by the RIS electromagnetic blocks; constructing the programmable reflection coefficient of the RIS electromagnetic unit; constructing a double-superposition reflection gain model of the RIS electromagnetic unit performance; and integrating these to obtain the final path loss model method. This invention achieves a unified theoretical framework for propagation characteristics from near field to far field, significantly improves computational efficiency, and can be dynamically adjusted according to actual scenario requirements, achieving a dynamic balance between computational efficiency and system performance, providing engineering support for RIS to achieve low-latency, deployable systems in real dynamic environments.

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.

This application proposes a design method for a vehicle-mounted adaptive antenna. This method uses the metal of the vehicle body as the main radiating element of the antenna. Based on the method of moments (MoM), it starts with the magnetic vector potential, calculates the magnetic field, and then uses the magnetic field to calculate the electric field. Finally, it uses Ampere's law from Maxwell's equations to obtain a wave equation based on the magnetic vector potential. The integral relationship between the electric field and the surface current is solved using the wave equation. By observing the surface current distribution and radiation pattern on the vehicle body structure, modes that meet the coverage and feeding requirements are identified, and these modes are excited by feeding. Alternatively, in cases requiring broadband design, excitation can be added to multiple regions with similar surface current distributions to achieve simultaneous excitation of multiple modes, thus realizing a broadband mode antenna design. Since the main radiating element of this antenna is the metal structure of the vehicle body, it has advantages such as ease of implementation, low cost, simple structure, and no space occupation within the vehicle.

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.