28 results about "Directivity pattern" patented technology

The invention discloses an array antenna phase-only real-time beam scanning and side lobe control method based on machine learning. Firstly, array geometry, scanning angles and minor lobe indexes are set; and then, array element excitation phases meeting requirements are rapidly synthesized by using a phase-only fast Fourier FFT (Fast Fourier Transform) algorithm. Constructing a training data set by taking the scanning angle and the minor lobe index as input and the corresponding phase distribution as output; training a neural network by using the data set to obtain a real-time prediction model from initial excitation distribution to accurate excitation distribution; and according to a target expected directional diagram scanning angle and a sidelobe feature, inputting the scanning angle and the sidelobe feature into a neural network to predict and obtain an array element excitation phase so as to realize a real-time phase-only beam and sidelobe control function. Input dimensions are reduced by extracting key features of a directional diagram, data generation is accelerated by means of FFT, real-time performance and precision are both considered, and the method is suitable for fast beam scheduling tasks of various array antennas.

The invention belongs to the technical field of short-wave communication, and particularly relates to a short-wave sky wave channel propagation parameter optimization method based on antenna directivity, which comprises the following steps: acquiring directivity diagrams of a transmitting antenna and a receiving antenna; determining a propagation path of sky wave rays from a transmitting antenna to a receiving antenna by adopting a numerical ray tracing algorithm; according to the propagation path, calculating free space propagation loss, ionosphere loss and ground reflection loss; performing directional gain correction on the signal intensity on the propagation path according to the directional diagrams of the transmitting antenna and the receiving antenna; calculating the total propagation loss according to the free space loss, the ionosphere loss, the ground reflection loss and the antenna directivity correction value; outputting propagation parameters including the total propagation loss, the propagation path, the antenna directivity correction value and the time delay; according to the method, antenna directivity parameters and propagation path loss are dynamically coupled, and the defect that a traditional model ignores the influence of antenna radiation directivity on signal strength is overcome.

A first electrical signal is received from a first cardioid microphone capsule of a microphone assembly. The first cardioid microphone capsule is oriented to face in a first direction. A second electrical signal is received from a second cardioid microphone capsule of the microphone assembly. The second microphone capsule is oriented to face in a second direction that is opposite the first direction. A polar pattern is formed for the microphone assembly by converting the first electrical signal into a first audio signal and converting the second electrical signal into a second audio signal. A first weight is applied to the first audio signal and a second weight is applied to the second audio signal. The polar pattern is generated for the microphone assembly by summing the first audio signal and the second audio signal.

Disclosed in the present invention is a microfluidic antenna with a reconfigurable frequency and directivity pattern. The microfluidic reconfigurable antenna consists of six parts, which are a metal floor, a metal radiation patch, a top reflector, a middle dielectric substrate, a coaxial feeder line penetrating the dielectric substrate, and an annular microfluidic channel packaged with a magnetic liquid metal column, respectively. Different modes can be excited by means of manipulating the length of the magnetic liquid metal column in the microfluidic channel, thus realizing the switching between radiation frequency bands; an antenna directivity pattern is reconfigured by means of manipulating the position of the magnetic liquid metal column; the microfluidic antenna involves main beam switching in a total of ten azimuthal planes within three bands of 5.98-6.10 GHz, 6.08-6.23 GHz and 6.85-7.47 GHz, and the maximum gain values in the states of the three bands are 8.5 dB, 7.4 dB and 8.1 dB, respectively; and the front-to-back ratios are 13 dB, 17 dB and 16 dB, respectively. The present invention has the characteristics of a simple structure, easy integration, a good performance, no introduction of extra distortion, low noise, a high-power operation capability and flexible application.

The embodiment of the invention provides electronic equipment, the electronic equipment can comprise a first antenna and a second antenna, the first antenna can be arranged at a top frame of the electronic equipment, and the second antenna can be arranged at a top corner. The radiator of the second antenna can be connected with a second tuning switch, the second tuning switch can have the following switching states: a first switching state and a second switching state, when the second tuning switch is in the first switching state, current near the first frequency is distributed on the radiator of the second antenna, and when the second tuning switch is in the second switching state, current near the second frequency is distributed on the radiator of the second antenna. When the second tuning switch is in the second switch state, no current near the first frequency is distributed on the radiator of the second antenna. Thus, the second antenna can become a parasitic antenna of the first antenna by changing the on-off state of the second tuning switch, so as to change the current distribution of the first antenna, thereby adjusting the directional diagram of the first antenna, and designing a high-gain wide-beam satellite communication antenna under the limited clearance in the electronic equipment.

To provide a method for rendering a sound source.SOLUTION: The method 1000 comprises: Step s1002 of receiving an input audio signal corresponding to a sound source; Step s1004 of receiving a reverberation parameter indicating a target energy ratio of the audio reverberation component of the sound source; Deriving one or more of: (i) a relative gain associated with a first directivity pattern of the sound source; (ii) a relative gain associated with a first reference distance of the sound source; (iii) a relative gain associated with a first configuration of the reverberation unit; (iv) a relative gain related to a first time limit of the reverberation component; Further Step s1008 of generating an adjusted audio signal using the received input audio signal, the received reverberation parameters, and any one or more of the derived relative gains (I) - (iv).SELECTED DRAWING: Figure 10

In order to achieve an object that is to provide a communication control apparatus capable of improving utilization efficiency of frequency bands in communication using beams, the communication control apparatus includes at least one processor, which carries out: a control process of controlling a communication apparatus capable of communicating with a plurality of communication terminals by irradiating the plurality of communication terminals with a radio wave beam from an antenna; an acquisition process of acquiring control information that includes terminal position information indicating positions of the plurality of communication terminals, apparatus position information indicating a position of the communication apparatus, and constraint information including information indicating a physical constraint of the antenna; and a determination process of determining, on the basis of the control information, a directivity pattern of the antenna in generation of the beam, and allocation of a frequency band to the beam.

A speaker having a continuous waveguide on one side of the speaker. The speaker includes a plurality of drivers that are superimposed to project sound into the continuous waveguide. The continuous waveguide is acoustically continuous in multiple dimensions.

The invention particularly relates to a sparse array DOA (direction of arrival) estimation method based on an optimized array manifold dictionary, and the method comprises the steps: firstly carrying out the layout optimization of an initial uniform area array through combining a genetic algorithm, constructing an eight-element sparse array structure, and maintaining a directional diagram which is close to a full array while greatly reducing the number of array elements; performing energy screening on multichannel observation signals acquired by the sparse array, and extracting a dominant frequency band to improve an effective signal-to-noise ratio; and an optimized array manifold dictionary is constructed based on a phase compensation mechanism and an amplitude weighting mechanism, and the internal correlation of the dictionary is reduced by minimizing off-diagonal elements of a dictionary Gramer matrix. And on the basis, sparse reconstruction is carried out on the optimized dictionary by using an orthogonal matching pursuit algorithm, so that a direction-of-arrival estimation result of the sound source signal is obtained. According to the scheme, inherent direction finding fuzziness and grating lobes of the sparse array are effectively suppressed, the direction estimation precision is improved, and high reliability and high robustness are still kept under the condition that the number of array elements is remarkably reduced.

Provided is an aerial-staying type communication relay apparatus that can suppress fluctuations in a directivity pattern due to reflection at an antenna-mounting member to which a service link antenna is mounted, stably fix a footprint of a cell, and as a result, prevent deterioration of communication quality. The communication relay apparatus includes an antenna having plural antenna elements that form a cell for performing a radio communication of a service link to and from the terminal apparatus and an antenna-mounting member to which the antenna is mounted, and a layer of radio wave absorber or a layer of frequency-selective electromagnetic shielding member that selectively shields radio waves having a frequency of the service link, which is provided on an outer surface exposed to an outside of the antenna-mounting member. Phases and amplitudes of signals transmitted and received via each of the plural antenna elements of the antenna may be controlled.

A V2X antenna, including: a Z-directional radiator (120); an XY-directional emitter (130) configured to extend from a central position of the Z-directional emitter in a Z-direction, and an induction coupler (140) which is formed between the Z-directional emitter (120) and the XY-directional emitter (130) and is configured to apply an induced current with a predetermined level to the Z-directional emitter (120) and the XY-directional emitter (130), wherein the induction coupler (140) is formed in a cross shape, starting at a center of the XY-directional emitter (130), wherein the V2X antenna further comprises a substrate unit (110) formed along an edge of the Z-directional radiator (120) such that the Z-directional radiator (120) is formed within the substrate unit (110), and wherein the V2X antenna further comprises a power feeder (150) formed within the substrate unit (110), wherein an upper part of the power feeder (150) is configured to contact a lower part of the Z-directional radiator, and wherein the radiation directivity patterns and / or radiation directivity intensities of the Z-directional emitter (120) and / or the XY-directional emitter (130) are varied by means of biased directions of the position of the current feeder (150).

The application belongs to the technical field of wireless communication, and discloses a 1Bit reflection array phase optimization method, which comprises the following steps: step 1: initializing a population, i.e. a parent; step 2: combining a fast Fourier transform to calculate a target value of the parent; step 3: calculating the fitness and selection probability of an individual according to the target value; step 4: selecting, crossing and mutating the population individual to generate a new phase distribution, i.e. a child; step 5: repeating step 2 to calculate a target value of the child; step 6: selecting a new target value according to the target values of the child and the parent, and repeating steps 2 to 6 until an optimal solution is optimized; and step 7: verifying the correctness of the optimization result of the algorithm and the correctness of the optimization of the optimized directivity pattern. The application adopts a simplified directivity pattern calculation formula and combines a fast Fourier transform to speed up the calculation of the directivity pattern target value under different phase distributions, reduce the optimized gene sequence of the algorithm, and improve the optimization speed and convergence speed of the algorithm.

The invention relates to an antenna unit and electronic equipment, and the antenna unit comprises a feed source, a first radiation branch knot and a tuning circuit, the tuning circuit is connected with the feed source and a feed point of the first radiation branch knot, and is used for switching on a feed path between the feed point and the feed source, and capacitive parameter values of different feed paths are different. The first radiation branch knot can generate a first resonance mode and a second resonance mode of different resonance currents in a switchable mode under excitation of a feed signal when different feed paths are switched and conducted, and the first resonance mode and the second resonance mode are respectively used for supporting transmission of a first frequency band signal. Therefore, the antenna unit can use different resonance modes when transmitting signals of the same frequency band, the directional diagram complementary effect is achieved on the basis of low cost, the directional diagram of the single antenna is more perfect, the radiation performance is enhanced, and the user experience is improved.

The application discloses a chirp signal direction of arrival estimation method based on fractional domain deconvolution beam forming, and the method comprises the following steps: performing fractional order Fourier transform on array receiving signals by using optimal focusing order; generating fractional domain steering vectors according to array structure and optimal focusing order, and calculating beam forming output for all beam scanning directions; generating fractional domain array directivity patterns according to array structure and optimal focusing order, removing the influence of array spatial response by using deconvolution algorithm, and restoring real target spatial distribution; obtaining direction of arrival estimation results by peak searching based on the restored target spatial distribution; and realizing underwater detection and positioning based on the estimation results. The application realizes high-resolution direction of arrival estimation of a wideband chirp signal under the condition of a small aperture and low signal-to-noise ratio, and further realizes accurate detection and positioning of an underwater target.

The application discloses a method for separating same-frequency signals in space, which comprises the following steps: S1, acquiring the elevation angle and azimuth angle of a satellite; S2, calculating a guide vector of a satellite signal coming direction; S3, injecting an interference signal into other satellite coming directions except the satellite signal coming direction to be pointed, so as to obtain a new input signal X'; S4, applying an adaptive beam forming algorithm to the new input signal to obtain a synthesized directivity pattern which forms a pointing gain in the signal coming direction to be separated and forms a "null" in other signal coming directions, so as to separate the same-frequency signals; the application solves the problems of a complex system, large volume and high cost caused by the traditional method for separating same-frequency signals in space by using multiple directional antennas; the application avoids the problem of high calculation complexity of the array signal processing method using a multi-linear constraint, greatly shortens the calculation time, and can be realized by simply modifying the traditional anti-suppression interference algorithm, and is convenient and easy to implement.

To achieve a desired directivity pattern by suppressing generation of an unnecessary grating lobe even in the case of a sub-array antenna configuration.SOLUTION: In the radar device, a first interval between two adjacent transmission antennas among the plurality of transmission antennas is one wavelength or more in the first direction, an interval between two adjacent reception antennas among the plurality of reception antennas is one wavelength or more in the first direction and is narrower than the first interval between the transmission antennas, and a second interval between two adjacent transmission antennas among the plurality of transmission antennas is 0.5 wavelength or more and 0.75 wavelength or less in the second direction. An absolute value of a difference between the first interval between the two adjacent transmission antennas and the interval between the two adjacent reception antennas includes an interval of 0.5 wavelength or more and 0.75 wavelength or less in the first direction, a size of each of the plurality of transmission antennas in the short-side direction is 0.5 wavelength or less, and a size of each of the plurality of reception antennas in the short-side direction is 0.5 wavelength or less.SELECTED DRAWING: Figure 10

Wide band Multiple-Input Multiple-Output (MIMO) antenna arrays include elements that taper from small ends located proximate to ground planes to larger ends which may be extended with vertical walls. Shapes of tapered elements exhibit different directivity patterns may be used in the same array and / or elements may be oriented differently such that their directivity patters peak in different directions. Each element is provided with ground shunted conductors which serve to increase non-uniformity in the azimuthal directivity patterns. The ground shunt conductors are strategically placed to reduce element intercoupling which foster improved MIMO system performance.

This invention provides an echo generation method based on single-frequency MIMO arc scanning. Using simulated single-frequency MIMO arc scanning data as input, the method employs a filtered back projection (BP) algorithm to generate three-dimensional images at different attitudes. Scattering center information from the three-dimensional images is extracted to form a list of all-attitude three-dimensional scattering centers. Echoes are synthesized by weighted superposition of scattering center contributions based on the geometric relationship between the radar and the scattering centers, combined with directivity patterns. This method significantly reduces the amount of broadband data required by traditional imaging methods, improves the modeling efficiency of single-frequency input, and can adapt to echo simulations for arbitrary paths and a large number of attitudes, significantly enhancing echo simulation efficiency.

The application discloses a wide-area sparse array multi-frequency-point joint low-sidelobe beam forming method, and relates to the field of beam forming.The application firstly constructs a wide-area sparse array, and determines available working frequency bands and working frequency points;secondly, different frequency points of different frequency bands are selected for joint beam forming, the maximum sidelobe-to-main lobe ratio is calculated, and the frequency band and the number of frequency points that make the maximum sidelobe-to-main lobe ratio minimum are determined;finally, the final directivity pattern function is determined, and beam forming is performed.The application can make the wide-area sparse array form a low sidelobe, and can solve the problem of excessively high sidelobe of the wide-area sparse array during beam forming.

The invention provides a mobile terminal. The mobile terminal comprises an antenna system, the antenna system comprises a first control switch, a first main radiator and a second main radiator, the first main radiator and the second main radiator can be used for forming a composite antenna, and therefore an impedance matching circuit coupled with the first main radiator can be switched through the first control switch. According to the composite antenna, the signal impedance phase of the first main radiating body is adjusted by adjusting the signal impedance phase of the first main radiating body, so that a plurality of phase states are provided for the first main radiating body by utilizing different impedance matching designs, a plurality of signal phase differences are formed between the first main radiating body and the second main radiating body, and the directional diagram of the composite antenna is adjustable. Therefore, by adopting the design scheme of the antenna system of the mobile terminal provided by the invention, the diversity of the directional diagram of the antenna system is improved, so that the communication performance of the antenna system is improved.

The application provides a sparse array underground target size non-contact measurement method based on zebra optimization, and belongs to the technical field of non-contact size measurement of underground targets. The method can effectively suppress sidelobe levels, and solves the problem that existing methods cannot effectively suppress sidelobe levels. The method comprises the following steps: constructing a measurement signal directivity pattern optimization model of a sparse array; initializing zebra algorithm parameters, and randomly initializing parameter configurations of each individual in a population; updating the parameter configurations of individuals in the population according to zebra foraging behavior; according to zebra anti-predation behavior, when a preset trigger condition is met, the parameter configurations of individuals in the population are updated by jumping; the fitness of the current population is calculated, if a termination condition is met, the optimal array parameter configuration is output, otherwise the position of the predator is updated and the updating step is returned for continuous iteration; the optimal array parameter configuration is used to drive the sparse array to detect the underground target, and the size of the underground target is calculated based on the echo signal obtained after detection. The method is mainly used in the field of nondestructive testing.

The invention relates to a directional diagram fixed-frequency switchable miniature fabric wearable antenna, which belongs to the technical field of wearable wireless communication, and comprises a patch layer, a substrate layer and a bottom surface layer which are positioned on the upper and lower end surfaces of the patch layer, a feed probe and symmetrically arranged snap fastener devices, the two metal via hole pipes penetrate through the substrate layer and are connected with the two communication clamping pieces respectively, and the two communication clamping pieces enable the switching diode to be switched on and off by controlling direct current bias voltage, so that switching of the antenna between a patch mode and a monopole mode is achieved. Reconstruction of a working mode and a radiation pattern is realized through a method of setting direct current bias voltage of the snap switch device, miniaturization of the antenna is realized through a method of using a semi-structure, the plane size is only 0.09 lambda2, and the antenna is respectively in a patch mode and a monopole mode under the condition that the direct current bias voltage is 0V and 5V at the frequency of 2.45 GHz, so that the antenna can be applied to the field of antenna communication. Radiation directional diagrams are suitable for in-vitro communication and body surface communication respectively.

The application discloses a multi-constraint intelligent array antenna arrangement method and system, and belongs to the technical field of array antenna design, and comprises the following steps: S1: effective area division; S2: area array element position screening; S3: array element re-distribution area; S4: adaptive value output; and S5: evolutionary algorithm iteration. The application adopts the re-partition principle, greatly improves the poor uniformity and other performances caused by random arrangement under the premise of meeting the array element spacing requirement, and simultaneously improves the success rate of array element tracking; through statistical analysis of the array element positions in the new area, the arrangement law of the array elements in the range is acquired, and the successively determined movement law can effectively avoid tracking in the dense area, greatly shortens the optimization time, and simultaneously guiding the to-be-distributed array elements to the area with low array element density can effectively utilize the array aperture, and improves the antenna array directivity pattern performance obtained through the final tracking.

The invention provides an antenna and electronic equipment, belongs to the technical field of antennas, and can solve the problem that the out-of-roundness of a directional diagram is increased due to the serious coupling effect of an existing digital indoor distribution antenna. The antenna disclosed by the invention comprises a bearing substrate (10) and a plurality of oscillators arranged on the bearing substrate (10), the working frequencies of at least part of the vibrators are different; the antenna further comprises an isolation structure (3) which is arranged on the bearing substrate (10) and located between the two adjacently-arranged oscillators with different working frequencies. The isolation structure (3) comprises a first dielectric substrate (3-1) and at least one isolation layer, wherein the first dielectric substrate (3-1) and the at least one isolation layer are arranged on the bearing substrate (10). The first dielectric substrate (3-1) is provided with a first surface and a second surface which face the oscillator and are oppositely arranged, and at least one of the first surface and the second surface is provided with the isolation layer. The antenna disclosed by the invention has relatively low directional diagram out-of-roundness and good radiation performance.

The application relates to the technical field of antennas, and particularly discloses a satellite-borne antenna based on a structural spline function directional diagram shaping, which comprises a feed waveguide, a transition device, a conversion section and a choke structure; the feed waveguide, the transition device, the conversion section and the choke structure are sequentially connected in series; the inside of the conversion section is provided with a gourd-shaped cavity, the large end of the cavity is arranged on the side close to the choke structure, and the small end of the cavity is arranged on the side close to the feed waveguide. The discontinuity of the waveguide is changed by shaping the inner wall of the antenna through the structural spline function, so that the control of the high-order mode excitation ratio is realized, then the mode field of the radiation surface is disturbed in amplitude and phase through the choke phase distribution groove, and finally the shaped directional diagram with specific requirements is obtained. The application can solve the problems of the existing satellite-borne antenna, such as miniaturization difficulty, low power capacity, poor shaping beam equalization, small shaping angle and the like.

The invention discloses an adaptive real-time zero setting method for a directional diagram of a large-scale arbitrary geometric array, relates to the field of array antenna directional diagram synthesis, and aims to solve the problems of insufficient directional diagram null forming precision and overhigh comprehensive calculation complexity of a large-scale irregular array in a dynamic interference environment. The method comprises the following technical steps: firstly, establishing a directional diagram unified expression of any geometric array, and providing general modeling for different topologies; secondly, deducing an excitation analytic solution in the target direction when the directivity coefficient is maximum, and laying a foundation for constructing a beam base with directional enhancement capability; then, the directional diagram is expressed as a linear combination of a preset beam base, and the calculation dimension is reduced; then, a beam space manifold vector used for multi-direction null control is constructed to support null constraint accurate expression; and finally, deducing an excitation analytic solution of adaptive zero setting of the directional diagram in the beam space to realize rapid reconstruction. The method has the characteristics of analysis and non-iteration, microsecond-level zero setting adjustment can be completed on a conventional platform, and the method has real-time performance, structural adaptability and high-precision directional diagram performance.

A speaker having a continuous waveguide on one side of the speaker. The speaker includes a plurality of drivers that are superimposed to project sound into the continuous waveguide. The continuous waveguide is acoustically continuous in multiple dimensions.

The invention provides a dual-polarized antenna. The dual-polarized antenna comprises a radiation patch, a dielectric plate and a metal grounding plate, the dielectric plate comprises a first dielectric plate and a second dielectric plate, the first surface of the first dielectric plate is provided with a radiation patch, and the second surface of the first dielectric plate protrudes to form a cavity; a feed probe is arranged in the cavity; a concave groove structure is formed in at least one dielectric plate, a transmission line is arranged in the concave groove structure to be connected with a feed probe for differential feed, and the transmission line mode can reduce high-frequency transmission loss; the metal grounding plate comprises a first metal grounding plate and a second metal grounding plate, the first metal grounding plate is arranged between the two layers of dielectric plates, and the second metal grounding plate is arranged below the second dielectric plate. The radiation efficiency of the antenna is improved by adopting the cavity structure; the transmission line is arranged in the concave groove structure of the dielectric plate and is connected with the feed probe to carry out coupling feed on the radiation patch, the isolation between two polarizations of the antenna and the symmetry of a directional diagram are improved through a differential mode, and signal interference is reduced.