33 results about "Planar array antenna" patented technology

The invention relates to a broadband planar array antenna light-operated beam forming method based on multi-task sparse learning, and the method comprises the steps: deducing an array factor expression of a broadband array as priori knowledge through employing a rectangular planar array antenna; constructing a multi-frequency-point beam joint optimization model of the planar array antenna based on the neural network; based on the priori knowledge, calculating a total loss function of the model by using expected broadband array pattern data and a group inhaul cable regularization method, and training a multi-frequency-spot beam joint optimization model; and based on the trained model, obtaining the optimal array layout and the amplitude and delay distribution of each array element, and calculating to obtain a low-sidelobe directional diagram in which the deflection angle is irrelevant to the frequency. According to the invention, the deflection angle of the array radiation beam is kept constant in a broadband range, and the problem of'beam squint 'of a traditional phased array is solved; and meanwhile, the beam sidelobe level of each frequency point is effectively suppressed, and the grating lobe problem of the uniform array on the broadband is avoided.

A dadome with a surface varying refraction angle for phased array antennas, includes an electromagnetic wave active area which consists of a dielectric substrate and two dual-polarized meta-surfaces. The dual-polarized meta-surfaces are made of plurality of periodically arranged metallic meta-atoms with open, rotational symmetric, and non-continuous geometrical patterns. The meta-atoms overlap complementarily between the two sides of the dielectric substrate and are periodically arranged into at least two groups covering a space region the angular radiation pattern of a planar array antenna. The geometric dimensions of the meta-atoms vary within each group so that to form an electromagnetic transmissive phase gradient within that group and different from one group to another. The periodicity Δp of the meta-atoms is between λ / 4 and λ / 1.3, λ being the wavelength of an incident electromagnetic wave from a planar array antenna.

The invention discloses a design method of a novel Ka-band microstrip planar array antenna. The antenna has a dual-band working mode. By adopting the one-to-eight power division feed network, efficient feed of the array unit is realized, and good impedance matching is ensured. In addition, the designed decoupling structure DS effectively reduces mutual coupling between the antenna units, the mutual coupling effect is inhibited, and the antenna performance is further optimized. The dual-frequency working frequency band of the antenna is 34-35 GHz and 35-36 GHz, the inter-unit isolation degree is smaller than 35 dB, the average gain exceeds 13 dBi, and the H-surface half-power lobe width is smaller than 20 degrees. The antenna has the advantages of stable bandwidth, low isolation, high gain, high directionality and the like, and is suitable for multiple fields of millimeter wave communication, radar systems, satellite remote sensing and the like.

The invention provides a multi-target fast direction estimation method based on blind sparseness. The method comprises the following steps: receiving a multi-source noise-containing signal through a planar array antenna; converting the multi-source noise-containing signal into a direction angle multi-source noise-containing signal model based on the relationship among the direction angle, the pitch angle and the azimuth angle; performing equal grid division on the direction angle, and based on a division result, screening out high-probability direction angle grid points from all grid points obtained by division; generating a sub-dictionary according to the steering vector of each high-probability direction angle grid point; based on an orthogonal matching pursuit fast algorithm, obtaining an estimation signal according to the sub-dictionary, the multi-source noise-containing signal and a preset threshold value; obtaining a target signal according to the estimation signal and a preset threshold value, and obtaining direction angle information corresponding to the target signal; and converting the direction angle information corresponding to the target signal into a pitch angle and an azimuth angle to obtain a direction estimation result of the multi-source noisy signal, so that the direction estimation of the multi-source noisy signal is efficiently completed under the condition that the number of targets is unknown.

The invention discloses an RIS-assisted hybrid beam forming millimeter wave communication system and method, and the system comprises a base station which is provided with Nt uniform planar array antennas; the base station adopts a hybrid beam forming structure, and Nt transmitting antennas share NRF radio frequency links; the RIS is provided with M uniform planar array reflection elements and can adjust a reflection coefficient according to real-time channel state information; the user terminal communicates with the base station through the RIS; according to the method, beam forming and RIS reflection coefficient configuration are mixed by adopting a joint optimization method based on a codebook, so that the calculation burden in the channel estimation and beam forming processes is reduced. According to the invention, the RIS is introduced into the hybrid beam forming millimeter wave communication system, so that the problem of communication interruption caused by shielding is relieved. The invention further provides a joint optimization method based on the codebook, and the joint optimization method is used for hybrid beam forming and RIS reflection coefficient configuration so as to reduce the calculation burden in the channel estimation and beam forming process.

The utility model relates to a flat plate array antenna technology, and especially relates to a 45-degree low-sidelobe flat plate array antenna. The antenna comprises a radiation layer, a back cavity layer and a feed layer. A radiation layer is laminated above a back cavity layer, the back cavity layer is laminated above a feed layer, and the feed layer is used for outputting 4 * 4 paths of TE10 mode signals; the radiation layer is provided with 4 * 4 input ends and 4 * 4 output ends, the 4 * 4 input ends of the radiation layer are used for accessing 4 * 4 paths of TE10 mode signals output by the feed layer in a one-to-one correspondence manner through transfer of the back cavity layer, and the 4 * 4 output ends of the radiation layer are used for radiating the 4 * 4 paths of TE10 mode signals output by the feed layer to a free space in a one-to-one correspondence manner. The low side lobe flat plate array antenna is simple in structure, low in cost, easy to realize batch production, wide in frequency bandwidth and high in efficiency.

The present application provides a method and device for generating spoofing interference for authorized users. Among them, the planar array antenna is composed of microstrip patch antennas with small volume and low cost arranged in a plane according to a set rule. It neither needs to divide the sub-spatial domain or sub-spherical surface in advance, nor does it need to specially design the coverage area of the planar array antenna. Therefore, it is significantly superior to the existing methods in terms of volume, cost, power consumption, and deployment. During the process of satellite navigation signal purification, the obtained optimal weight vector is the optimal weight vector in the sense of minimum variance distortionless response. On the one hand, it has strong amplitude and phase compensation capabilities, so the requirements for the amplitude and phase of the RF channel are significantly reduced compared with the existing methods, which is conducive to engineering implementation. On the other hand, in the presence of external interference and transceiver mutual interference, the array antenna pattern forms a depression in the direction of the interference with dominant power, thereby avoiding the influence of interference and mutual interference on satellite navigation signal purification.

The invention discloses an array and difference beam co-excitation optimization method and system based on unit dynamic range ratio constraint and a storage medium, and mainly solves the problem that an array and difference beam directional diagram cannot be optimized in a complex application scene and the dynamic range ratio cannot be reduced at the same time in the prior art. The implementation scheme comprises the following steps: determining an antenna optimization index; optimizing the planar array antenna and the difference beam directional diagram by adopting a convex optimization algorithm, and solving the planar array antenna and the difference beam directional diagram to obtain an initial sum beam complex excitation coefficient meeting a constraint condition; adding a unit dynamic range ratio constraint in a planar array antenna and difference beam directional diagram optimization problem, and converting the directional diagram optimization problem after adding the unit dynamic range ratio constraint into a series of convex optimization sub-problems; iteratively solving the convex optimization sub-problem by using a solver to obtain an optimal sum beam excitation coefficient; and synthesizing a sum and difference beam directional diagram of the array according to the optimal sum beam excitation coefficient. According to the invention, the sum-difference beam synthesis with a small dynamic range ratio can be effectively realized while the radiation performance constraint is satisfied, and the method can be used for a monopulse radar system with a cover.

This invention discloses a UAV backscatter communication method and related device based on the integration of sensing, communication, and energy. The invention uses a UAV equipped with a uniform planar array antenna as a dual-function access point in the air, transmitting communication and sensing multiplexed signals to ground-based IoT devices and potential sensing targets. Ground-based IoT devices can choose to collect energy from the signal or modulate their own information onto the transmitted signal and reflect it back to the UAV, thereby completing energy transmission and information collection tasks respectively. By using an alternating optimization algorithm to optimize the UAV's flexible mobility, beamforming spatial control capabilities, and device scheduling capabilities, the average total throughput of the device backscatter return link can be maximized while meeting the sensing performance and energy collection requirements of IoT devices. This achieves deep synergy between sensing, communication, and energy supply, thereby realizing resource reuse and transmission performance balance across multiple tasks.

The invention discloses a spatial three-dimensional fixed-point secure transmission method based on a planar array, constructs a spatial three-dimensional fixed-point secure transmission architecture based on a planar array antenna, and solves the problems that aiming transmission can only be realized in a two-dimensional space based on a linear frequency control array antenna, and accurate fixed points in a vertical distance of a three-dimensional space cannot be realized. By means of a beam forming algorithm based on weighted vector product optimization, the problems that planar frequency control array beam forming is high in complexity and poor in main lobe energy focusing degree are solved.

The invention discloses a one-dimensional unfolding planar array antenna unfolding mechanism, which comprises an unfolding mechanism base, an unfolding mechanism and an antenna panel, and is characterized in that the unfolding mechanism base is connected with the unfolding mechanism; the unfolding mechanism is used for supporting the antenna panels and providing structural rigidity support after being completely unfolded, the unfolding array surface of the unfolding mechanism is large, and the unfolding mechanism is used for enabling the antenna panels to be finally arranged in the same plane. According to the invention, while the storage ratio and the unfolding size of the antenna are improved, the rigidity of the unfolding mechanism is improved under the condition of ensuring light weight. The mechanism also has a modular expansion function, the number of modules is large, and the expansion array surface is large.

A superstate for a planar array antenna that includes a first major surface and an opposing surface facing a substrate of the planar array antenna where the opposing surface includes at least one first surface location and at least one second surface location that is positioned closer to the substrate than the at least one first surface location.

The application relates to a beamforming Doppler radar microstrip planar array antenna, which comprises a microstrip antenna layer, the microstrip antenna layer comprising a first microstrip series feed array group and a second microstrip series feed array group; the first microstrip series feed array group comprising a plurality of parallelly arranged first series feed arrays; the plurality of first series feed arrays having a first parallelogram shape; the first microstrip series feed array group comprising a plurality of parallelly arranged second series feed arrays; the plurality of second series feed arrays having a second parallelogram shape; the number of the first series feed arrays and the second series feed arrays being equal, and the first series feed arrays and the second series feed arrays being arranged at intervals; the first parallelogram and the second parallelogram being completely identical in shape and intersecting with each other, and the first parallelogram and the second parallelogram being symmetrical about the intersection line axis after intersection. The Doppler radar microstrip planar array antenna has better beamforming capability, the antenna main beam has gamma-psi separable characteristics, and the structural performance is more convenient to use.

The invention discloses a three-dimensional polar domain channel estimation method for a super-large-scale intelligent reflector system, and the method comprises the steps: building an RIS auxiliary communication channel model of UPA-ULA, the RIS being a uniform planar array UPA antenna arrangement, and the base station and the user being a uniform linear array ULA; according to the RIS auxiliary communication channel model, pilot signals received on the subcarriers are obtained; performing polar domain transformation on the received pilot signal to enable the signal to show sparsity in a polar domain; designing a polar domain three-dimensional dictionary containing three near-field polar domain channel variables including a pitch angle, an azimuth angle and a distance based on the pilot signal after polar domain transformation, and sparsely representing channel characteristics; and estimating the channel by using the polar domain three-dimensional dictionary through an orthogonal matching pursuit algorithm, and recovering channel state information. The method provided by the invention can improve the precision and stability of channel estimation in a complex system of RIS auxiliary communication.

The invention relates to a low-profile reconfigurable transmission array antenna and a wave beam regulation and control method, and the low-profile reconfigurable transmission array antenna comprises a ridge gap waveguide feed source array, a reconfigurable transmission array loaded with a variable capacitance diode, and a logic voltage control module. The reconfigurable transmission array placed in a radiation near-field region of the feed source array is excited, and the distance between the space feed source and the reconfigurable transmission array is shortened to 1 / 4 of the focal length, so that the profile height of the reconfigurable transmission array antenna is effectively reduced. In the wave beam regulation and control process, the phase distribution of the reconfigurable transmission array is changed through the logic voltage module, and single-wave-beam + / -75-degree * + / -75-degree ultra-wide-angle two-dimensional scanning and multi-wave-beam simultaneous flexible and controllable wave beam number and wave beam direction can be realized respectively. The antenna has the advantages of low profile, low power consumption, wide beam scanning coverage, high beam regulation and control flexibility and the like, and has important application prospects in the fields of wireless communication, radar detection and the like.

The present invention discloses a forward-looking three-dimensional imaging technology for an airborne radar based on a two-dimensional super-resolution algorithm. A planar array antenna is used to receive scattered echoes from targets in the area in front of the carrier aircraft. After pulse compression and range migration correction are performed, the observation area is gridded and azimuth-elevation echo modeling is completed. For each two-dimensional snapshot data, a weighted least squares criterion is used to construct a cost function with weights. The parameters are iteratively updated until the estimation results converge to obtain a single azimuth-elevation super-resolution spectrum. Two-dimensional spectrum incoherent accumulation is performed on several super-resolution spectra of the same range gate to obtain three-dimensional super-resolution data in polar coordinates. Finally, the polar coordinate data is transformed into a spatial rectangular coordinate system and plotted to obtain forward-looking three-dimensional super-resolution imaging. The present invention only requires a single snapshot to complete azimuth-elevation two-dimensional super-resolution, which overcomes the disadvantage that a moving platform cannot accumulate a large number of snapshots for the same observation target while further improving the imaging resolution.

The invention discloses an integrated high-speed satellite communication terminal which is deployed in a sea surface buoy, the communication terminal comprises an S-band planar array antenna, a Beidou positioning navigation antenna, a duplexer group and a communication machine, and the communication machine and the duplexer group are jointly installed on the back face of the S-band planar array antenna; the S-band planar array antenna adopts a circular array antenna and is matched with the duplexer group to realize receiving and transmitting of a Tiantong satellite signal and a relay satellite SMA service link communication signal; the Beidou positioning and navigation antenna is used for receiving Beidou positioning and navigation information; the communication machine comprises a radio frequency transmit-receive front end and a communication signal processing module, and the communication signal processing module is used for carrying out characteristic detection and communication protocol processing on signals of the radio frequency transmit-receive front end, demodulating radio frequency signals of a receiving link, modulating signals of a transmitting link and completing switching of communication modes.

The invention provides a four-chip cascaded microstrip array antenna system, which comprises a dielectric substrate, antenna arrays arranged on the dielectric substrate, the antenna arrays are distributed in a rectangular shape, adopt a microstrip comb-shaped planar array antenna structure and are connected through a one-to-two microstrip power divider, and an SIW feeder network connected between the antenna arrays and millimeter wave radar chips. Due to the fact that the square MIMO sparse array layout is formed in the horizontal direction and the pitching direction, the maximum space utilization rate, the maximum aperture and the minimum mutual coupling effect can be achieved, miniaturization and structure compactness of the array antenna are achieved through the four-chip cascade connection mode, and the antenna has the advantages of being simple in structure, low in cost and easy to popularize. The radar system is more easily integrated with a chip and a digital circuit system, the complexity and the cost of the whole system are reduced, and compared with the prior art, the radar system has the advantages of higher 4D point cloud imaging capability, farther target detection distance, low side lobe, high angle resolution, multi-target tracking, high integration level and the like.

The present invention discloses a broadband millimeter-wave stripline planar array antenna, comprising: a first dielectric substrate, a second dielectric substrate, and a third dielectric substrate laminated together in sequence, and metallized through-holes extending through each dielectric substrate; a first copper-clad floor is provided on the lower surface of the first dielectric substrate, a stripline power-splitting copper-clad layer is provided on the lower surface of the second dielectric substrate, and a second copper-clad floor is provided on the upper surface of the second dielectric substrate; a third copper-clad floor is provided on the upper surface of the third dielectric substrate, and second and third slots are provided on the second and third copper-clad floors, respectively, corresponding to the power-splitting terminals of the stripline power-splitting copper-clad layers; each power-splitting terminal, the corresponding second and third slots, and the metallized through-holes surrounding the three components together form an antenna unit. The present invention has the advantages of broadband, planarity, high gain, low processing cost, and ease of mass production.

The present invention achieves a planar array antenna having increased flexural strength. Provided is a planar array antenna 110 in which a plurality of radiating elements are arranged along one direction on a dielectric substrate. The planar array antenna 110 comprises a common ground conductor plate 113 which is provided so as to be shared by the plurality of radiating elements. Planar antenna regions 110a, which respectively correspond to the radiating elements 111, have a common ground conductor plate 113 that is provided in parallel in the arrangement direction of the plurality of radiating elements 111 and a pair of ground conductor patterns 112a, 112b that are connected via a via conductor VI. A first dummy pattern DP1a, DP1b is provided between ground conductor patterns 112a, 112b which are adjacent to each other in the arrangement direction.

The invention provides a radar signal transmitting and receiving integrated positioning method based on an information metasurface antenna, and belongs to the technical field of wireless sensing, the radar signal transmitting and receiving integrated positioning method comprises a signal transmitting and receiving module, a universal software radio peripheral (USRP) is used as an excitation source and generates a linear frequency modulation signal, and the information metasurface antenna is used for transmitting an electromagnetic scanning signal and receiving a target reflection signal; the coding control module is used for providing dynamic coding for the metasurface; and the signal processing module is used for carrying out real-time processing on the reflection echoes to realize target sensing and positioning. The information metasurface antenna comprises a transmission metasurface, a planar array antenna and a circulator, the planar array antenna is used for carrying out equivalent plane wave excitation on the transmission metasurface, and the circulator is used for achieving signal receiving and transmitting integration. According to the invention, signal receiving and transmitting integration and target sensing and positioning are realized through the information metasurface antenna, the use of a feed source horn and a receiving antenna is avoided, and the antenna has the outstanding advantages of low cost, simple structure, easy deployment and the like.

The present invention relates to the technical field of antenna design, and particularly to a coupled-feed linear array antenna, a coupled-feed planar array antenna, a radar, and a vehicle. The coupled-feed linear array antenna includes a substrate, a main radiation unit, a main feeder, auxiliary radiation units, and auxiliary feeders. One end of the main feeder is connected to the main radiation unit, and the other end of the main feeder is connected to an antenna port. Along the second direction, the two auxiliary radiation units are symmetrically arranged on both sides of the main radiation unit. Along the second direction, the two auxiliary feeders are symmetrically arranged on both sides of the main radiation unit. The auxiliary feeder includes a first section and a second section. The first section is arranged adjacent to the main radiation unit, and there is a gap between the first section and the main radiation unit. The second section is connected to the first section and the auxiliary radiation unit. By adopting the coupled-feed method, the phase distribution can be adjusted by adjusting the length of the auxiliary feeder, and the amplitude distribution can be adjusted by adjusting the gap between the auxiliary feeder and the main radiation unit, thus simplifying the design process.

The application provides a ubiquitous signal enabling positioning and pose measurement method based on least square residual, comprising: one, establishing a global coordinate system and a user terminal array antenna body coordinate system, and determining a conversion relationship; two, a user-l simultaneously receives signals of M ubiquitous signal base stations by using an H*V rectangular plane array antenna; three, array signal processing is performed at the user terminal, and signal arrival angles of the signals transmitted by the M ubiquitous signal base stations at the user-l are measured based on a MUSIC algorithm; four, the user-l combines M sets of signal arrival angle information and position coordinates of the ubiquitous signal base stations in the global coordinate system, and solves position coordinates and attitude angles of the user-l in the global coordinate system based on a least square residual multi-ubiquitous signal base station enabling user positioning and pose measurement method. The application solves the problem that a signal system is heterogeneous in an Internet of Things positioning scene in the prior art, thereby causing hardware structure redundancy and high system complexity, guarantees the ability to provide continuous positioning services for users, and effectively improves network service life.

A feed network device, which is electrically connected to unit radiating elements for circular polarization, may comprise a phase offset compensation circuit configured to correct a phase dispersion error according to a change in frequency so that four quarter arrays obtained by vertically and horizontally dividing a planar array of the unit radiating elements symmetrically are electrically and rotatably sequentially disposed clockwise or counterclockwise.

A radome having a surface varying refractive angle for a phased array antenna is provided. The radome includes an electromagnetically active region consisting of a dielectric substrate and two dual-polarized metasurfaces. The dual-polarized metasurfaces consist of a plurality of periodically arranged metallic metaatoms with an open, rotationally symmetric, non-continuous geometric pattern. The metaatoms overlap complementarily between two sides of the dielectric substrate and are periodically arranged into at least two groups that cover a spatial region of the angular radiation pattern of the planar array antenna. The geometric dimensions of the metaatoms are of various values ​​within each group, thereby forming an electromagnetic transmission phase gradient within that group that is different from one group to another. The period Δp of the metaatoms is λ / 4 to λ / 1.3, where λ is the wavelength of the incident electromagnetic wave from the planar array antenna.

The present invention provides a multi-target fast direction estimation method based on blind sparsity. The method comprises the following steps: receiving multi-source noisy signals through a planar array antenna; converting the multi-source noisy signals into a direction angle multi-source noisy signal model based on the relationship between the direction angle, the pitch angle and the azimuth angle; performing equal grid division on the direction angle, and screening out high-probability direction angle grid points from all the grid points obtained based on the division result; generating a sub-dictionary according to the steering vector of each high-probability direction angle grid point; obtaining an estimated signal according to the sub-dictionary, the multi-source noisy signal and a preset threshold value based on an orthogonal matching pursuit fast algorithm; obtaining a target signal according to the estimated signal and the preset threshold value, and acquiring direction angle information corresponding to the target signal; converting the direction angle information corresponding to the target signal into the pitch angle and the azimuth angle to obtain a direction estimation result of the multi-source noisy signal, thereby realizing efficient completion of direction estimation of the multi-source noisy signal when the number of targets is unknown.

The invention discloses a low-delay and high-reliability satellite-ground covert communication system and method, and belongs to the technical field of wireless communication, and the method comprises the steps: monitoring a ground monitor Willie through a satellite Alice, and carrying out the communication with a plurality of ground receivers; the satellite Alice is provided with a planar array antenna, the ground receiver is provided with a single antenna, and the ground monitor Willie is provided with two antennas; a wireless channel link between the satellite Alice and the ground receiver is a downlink channel, the ground receiver comprises a hidden ground user and a confidential ground user, the satellite Alice respectively sends a hidden signal and a confidential signal to the hidden ground user and the confidential ground user, and the ground monitor Willie detects the transmission of the hidden signal, so that a communication system with low time delay and high concealment is obtained.

The utility model relates to a broadband compact low-sidelobe planar array antenna, which comprises a dielectric substrate layer, a radiation patch and a feed network which are arranged on the upper surface of the dielectric substrate layer, a metal floor layer which is arranged on the lower surface of the dielectric substrate layer, and a coaxial port which is arranged at the central position of the feed network. The radiation patch is connected with the feed network, a central signal hole and peripheral grounding holes of the coaxial port penetrate through the dielectric substrate layer, one end of the central signal hole is connected with the feed network, the other end of the central signal hole is separated from the metal floor layer, and the lower layer of the peripheral grounding holes is connected with the metal floor layer; the metal floor layer is provided with rectangular windows which are arranged in an array mode to form a surrounding ground structure so as to improve impedance bandwidth. According to the utility model, the metal floor layer is provided with the rectangular window, and the umbrella-shaped radiation patch is used for widening the impedance bandwidth, so that the wider impedance bandwidth is realized.

The invention relates to a Beidou pseudo satellite signal simulation generation method and system and a storage medium. Comprising the following steps: generating a baseband signal; generating a spreading code; performing digital orthogonal up-conversion; performing radio frequency processing; and transmitting the planar array antenna. By introducing the Beidou pseudo satellite technology, the geometric configuration of satellite distribution is optimized, and the positioning precision is improved. After the Beidou pseudolite is introduced, in order to facilitate joint calculation with a real satellite signal, a high-precision taming crystal oscillator is selected to be combined with a time synchronization correction algorithm, nanosecond-level synchronization of pseudolite and BDS time is guaranteed, and the time synchronization problem is solved. And finally, in order to enable the receiver to normally and stably receive the Beidou pseudo-satellite signal and the navigation satellite signal which are produced in a simulation manner and suppress the near-far effect, the signal is fed back through the receiver, and the power parameter of the Beidou pseudo-satellite transmitting signal is dynamically adjusted. Through collaborative optimization of self-defined frequency bands, clock synchronization and power regulation, the positioning availability is improved to 95% from 68% in a complex environment, and the elevation precision is optimized by 65%.

The application discloses a sparse cloth plane array antenna optimization method and system, and the method comprises the following steps: constructing a multi-objective optimization model of a sparse cloth plane array antenna by taking minimization of a peak side lobe level and minimization of a main lobe width as an objective function; and solving the multi-objective optimization model according to a preset multi-strategy nonlinear multi-objective particle swarm algorithm to obtain an optimal antenna array distribution scheme. The method has superior global search capability and higher solution accuracy, and can achieve the optimization target of a sparse cloth antenna array.