704 results about "Directivity" patented technology

The invention relates to an ultrasonic phased array full-focusing imaging method for acoustic wave multi-path propagation compensation of a layered composite material, which is characterized by comprising the following steps of: arranging an ultrasonic phased array probe with N array elements on a composite material piece to be detected, obtaining complete echo data by taking each array element as a transmitting array element and taking all array elements as receiving array elements in sequence in a full-matrix acquisition mode; a two-dimensional pixel grid is established in an imaging area, a Monte-Carlo perturbation mechanism used for representing the acoustic wave propagation uncertainty in the layered composite material is introduced into a propagation model for each emission array element-receiving array element-pixel point combination, and the acoustic beam emission direction, the propagation path and the equivalent acoustic velocity are subjected to random perturbation, so that the acoustic wave propagation uncertainty in the layered composite material can be represented. Generating a plurality of equivalent sound wave propagation paths, calculating two-way propagation time of each path, and performing weighted statistics on energy contributions of different paths according to array element sound beam directivity to obtain equivalent propagation time delays of pixel points; and performing delay correction on a full-matrix echo signal by using the equivalent propagation time delay, and performing coherent superposition on signals of all transmitting-receiving array element combinations to realize dynamic focusing of a full-pixel grid, and finally reconstructing an ultrasonic full-focusing imaging image with high resolution and high signal-to-noise ratio. The time delay error caused by propagation path deviation and sound velocity non-uniformity in the layered composite material can be effectively compensated, the focusing precision and spatial resolution of full-focusing imaging are improved, meanwhile, an existing TFM imaging frame does not need to be changed, and the method has good engineering implementability and popularization and application value.

The invention relates to the technical field of chip preparation, and provides a chip based on an annular photonic crystal and a preparation method thereof. The preparation method comprises the following steps: growing a nucleating layer on a substrate; growing a superlattice structure on one side, away from the substrate, of the nucleating layer; sequentially growing an n-type coating layer, an n-type waveguide layer, a quantum well and a p-type electron blocking layer on one side, deviating from the nucleating layer, of the superlattice structure; etching a plurality of annular cavities on the p-type electron barrier layer to form an annular photonic crystal; growing a p-type extension contact layer on one side, deviating from the quantum well, of the p-type electron blocking layer; and carrying out in-situ annealing treatment. According to the preparation method, the directivity of the photonic band gap can be effectively adjusted, uniform light waves in all directions on the side face can be formed, so that leakage of laser from a non-light-emitting area on the side face is restrained, the light emitting efficiency is improved, the annular photonic crystals are periodically distributed, and the light beam quality is effectively guaranteed.

The invention relates to the technical field of optical fiber gyroscopes, in particular to a temperature control optical fiber inertial navigation structure and a design method thereof.The design method comprises the following steps of detecting heat flow direction changes, extracting offset numbers, generating frequency density, analyzing the thickness contour and deformation coincidence rate, outputting correction gradients, matching jump trends and structural connection, and generating a priority sequence; and screening offset channel numbers, integrating compression and deformation trends, and outputting a design scheme. According to the method, by capturing heat flow direction change points and extracting offset area numbers, density expression of a heat energy propagation path is achieved, the space recognition capability of thermal disturbance is enhanced, the structural adaptability of thermal response is improved, and stable conduction of heat flow between structural levels is optimized through sequence integration of a temperature jump trend and a connection relation; and extracting a stable channel number in a lateral offset state, enhancing path directivity, integrating a multi-region compression trend and structural deformation mapping, and improving thermal situation identification capability and structural thermal adaptability.

The invention discloses a portable satellite communication station signal optimization method and system, relates to the field of wireless communication, and is used for synchronously realizing dynamic adaptive management of multiple scattering paths. The method comprises the following steps: generating an earth surface image through multi-modal detection data, and carrying out layered calibration on scattering intensity; identifying a high-reflection sub-region according to the surface image and the layered calibration information thereof, and performing unified management on high-reflection and weak echo paths; based on the gain, interference and angle information of the multiple scattering paths, performing sub-array division on the antenna array according to priorities; phase stepping correction is carried out on the antenna units of the sub-arrays, and emission excitation is combined in adjacent path coverage areas; through a dynamic power scheduling and beam forming algorithm, the direction gain of each sub-array is optimized and sidelobe leakage is controlled. According to the invention, synchronous management of high reflection and weak echo paths can be realized, and the dynamic adaptability to scattering scenes is improved.

The invention discloses an unmanned aerial vehicle countering method and countering device for radio detection, and relates to the field of signal processing, and the method comprises the steps: scanning and capturing a transient radio frequency pulse signal through a radio frequency receiving array, carrying out the time-frequency domain conjoint analysis, constructing a signal intensity space distribution matrix, and extracting a parameter set; matching with a protocol feature library, identifying an unmanned aerial vehicle remote control link protocol type, and calculating an unmanned aerial vehicle position and a threat level in combination with a signal time difference of arrival and a frequency difference; generating adaptive interference signal parameters according to the protocol type and the threat level; the method comprises the following steps: generating a directional beam through a two-dimensional phased-array antenna, focusing the position of an unmanned aerial vehicle to transmit an interference signal, monitoring signal intensity change and protocol response delay in real time, calculating a communication suppression ratio, and iteratively optimizing an interference strategy until a suppression threshold is reached. The method has the advantages that efficient and accurate signal capture and interference are realized through multi-channel radio frequency detection, accurate positioning and adaptive interference technologies, and the countering efficiency and adaptability are remarkably improved.

The invention provides a dense small target detection method based on fuzzy perception. The method comprises the following steps: averagely segmenting an infrared image into a plurality of regions, blocks and sub-blocks; utilizing a nested four-way Mama network to respectively extract the features of the regions, the blocks and the sub-blocks, and sequentially embedding and fusing the extracted features to obtain an initial feature map; transmitting the initial feature map to a multi-scale context collaborative network, and outputting a final prediction feature map through information transmission and feature fusion operation; inputting the final prediction feature map into a detection head, and outputting arbitrarily distributed detection frame representation and detection frame quality estimation; and weighting the loss function and fusing the directivity to obtain a boundary fuzzy perception loss function for optimizing the whole process of small target detection. According to the method, the thermal radiation target with relatively high spatial distribution density can be accurately positioned in a complex scene, and the accuracy of infrared dense small target detection is improved.

The invention provides a wave-absorbing material, and belongs to the technical field of electromagnetic wave absorption. The wave-absorbing material comprises a metal reflection bottom layer, a wave-absorbing middle layer and a scattering upper layer, the wave-absorbing middle layer is made of a ferroferric oxide loaded reduced graphene oxide and epoxy resin (Fe3O4 (at) RGO / EP) composite material and used for absorbing electromagnetic wave energy, and the scattering upper layer is of a patterned metasurface structure made of chopped carbon fiber reinforced epoxy resin (SCF / EP). And a phase-regulated two-dimensional periodic array is formed. By arranging a three-layer structure of the metal reflecting layer, the Fe3O4 (at) RGO / epoxy composite wave-absorbing layer and the chopped carbon fiber scattering layer, broadband absorption and directional scattering control of electromagnetic waves within the range of 2-18 GHz are achieved, a stealth function composite material system with dissipation and deflection dual-mechanism cooperative work is formed, the structure utilizes the patterning design of the scattering layer, and the structure has the advantages that the structure is simple, the structure is compact, and the application range is wide. On the basis of the generalized Snell's law, engineering regulation and control of the radar wave reflection direction are achieved by regulating and controlling the reflection phase difference between pattern units, reflection energy is effectively deviated from the main lobe direction of a radar receiver, and therefore the reflection signal intensity of a target in a radar detection system is reduced.

The invention provides a temperature-controlled shape memory alloy helical antenna capable of automatically unfolding and a control method, and belongs to the technical field of antennae, and the antenna comprises a helical radiation unit which is made of a shape memory alloy material and is of a multi-circle helical winding structure; the edge of the metal reflection unit is warped upwards to form an annular reflection cavity, and the metal reflection unit is used for enhancing the directivity and radiation gain of the spiral radiation unit; the supporting rod is of a multi-section coaxial nested structure, is vertically mounted in the center of the metal reflection unit and is used for providing stable axial support in the contraction and expansion process of the spiral radiation unit; the dielectric disc is mounted between the supporting rod and the spiral radiation unit; the metal via hole structure penetrates through the dielectric disc and is used for connecting a coaxial cable and the radiation structure to form a complete feed path; and the impedance matching arm structure is used for connecting the feed path and the spiral radiation unit and adjusting the impedance matching relation between the feed path and the spiral radiation unit so as to realize impedance continuity and radio frequency matching.

The invention provides a multi-sensor data fusion method and system based on an intelligent pod. According to the method, a radiation data flow of an intelligent pod multispectral sensor in an electromagnetic interference field is collected; based on the data, the quantitative attenuation coefficient of the radiation value of each wave band in the interference field is calculated by using a radiation transfer equation. And generating a directional beam of the phased-array antenna by using the coefficient, and scanning a target area to obtain echo data. And finally, performing joint sparse representation on the original radiation data stream and the target echo data to generate a fusion result. The invention discloses multi-sensor data fusion based on an intelligent pod. According to the method, the anti-interference wave beam scanning target is dynamically generated by quantifying the attenuation of electromagnetic interference on radiation of each wave band, and the sensing performance of the intelligent pod in a complex electromagnetic environment is improved by combining the joint sparse representation and fusing the multi-source data.

The invention discloses a semiconductor defect detection method and device, and the detection method comprises the steps: controlling the bright field illumination and the objective magnification, and obtaining the surface microstructure morphology of a to-be-detected sample; determining the process type of the sample to be detected based on the surface microstructure morphology, and automatically determining dark field illumination light intensity parameters of at least two groups of dark field light sources according to a preset mapping relation between the process type and the dark field illumination light intensity parameters; according to the tissue morphology of the sample, at least two dark field light sources with different incident angles are controlled to carry out dark field illumination on the sample to be detected from different directions, and scattered signal images corresponding to different dark field angles are obtained through at least two detectors respectively; and analyzing defect information of the to-be-detected sample based on the scattered signal images at the dark field angles. The detection method can be adaptive to defect detection of different process sheet types, can effectively improve the detection precision of defect diversity and directivity, improves the detection signal-to-noise ratio, and efficiently detects multiple different types of defects at the same time.

The invention provides terminal equipment. The terminal equipment comprises a metal floor, a radiation branch knot and a feed source, the radiation branch knot is adjacent to and parallel to the preset edge of the metal floor, the projection of the radiation branch knot on the preset edge of the metal floor is located in the preset edge, and the radiation branch knot comprises at least one connecting part connected with the preset edge of the metal floor; the feed source is electrically connected with the radiation branch knot and is used for exciting the radiation branch knot to generate excitation current conducted along a first direction, so that the preset edge of the metal floor generates floor current, and the direction of the floor current of a first area corresponding to the radiation branch knot in the preset edge of the metal floor is a second direction; the direction of floor current in a second area in the preset edge of the metal floor is a first direction, the second area is adjacent to the first area, and the second direction is opposite to the first direction; the radiation branch comprises a main branch whose electrical length is 1 / 2 of the wavelength corresponding to the preset frequency band. Due to the current distribution, the directivity coefficient after far-field radiation electric field vector superposition is reduced, and the omni-directivity of the antenna is improved.

The invention relates to a non-Lambert surface emissivity inversion method, belongs to the technical field of infrared optical measurement and radiation modeling, solves the technical problems of low precision and poor model stability of non-Lambert surface emissivity inversion, and comprises the following steps: measuring original radiation intensity of a non-Lambert surface of a to-be-tested material in different emergent directions; converting the original radiation intensity into directional reflectivity; on the basis of the generalized Lorentz function, diffuse reflection background items are superposed, and a physical prior model is constructed; physical constraint is carried out on the physical prior model parameters; the parameter residual network generates a parameter field, and the parameter field is input into the optimized physical prior model; and carrying out hemispherical integration, and converting the directional reflectivity into directional-hemispherical emissivity. The device and the method are used for infrared thermal imaging measurement, material radiation characteristic characterization and engineering detection in a complex environment.

Apparatus for paging for highly directional systems. A WTRU receives a default and / or a dynamic set of active SSBs which indicates the beams / SSBs is used to receive paging DCI, e.g. DCI scrambled with P-RNTI, over PDSCH. A WTRU utilizes the default and / or dynamic set of active SSBs in order to determine PDCCH monitoring occasions, PMOs, that are monitored in the WTRU's paging occasions, POs. A WTRU sends paging activating requests to activate a suitable SSB using associated UL signal / resources, if the suitable SSB fulfills a SSB criteria, if the activation duration has elapsed and if the monitoring duration has elapsed. A WTRU may send one or more paging activation requests to activate multiple SSBs, e.g., a field of view, FOV, around a suitable SSB. Said paging activation requests implements a minimal feedback-based paging procedure for paging in highly directional systems, to which the gNB replies with paging configuration for the suitable SSB.

A compression driver for an omnidirectional loudspeaker includes a motor assembly and an annular diaphragm disposed coaxially below and operably connected to the motor assembly. A phasing plug is mounted to the motor assembly and includes a top portion facing the diaphragm, a bottom portion extending downwardly from the top portion from a first end to a second end, and a plurality of apertures that extend therethrough. The bottom portion has an inner surface that defines a cavity and widens from the first end to the second end, the inner surface having a plurality of radial channels with a diagonal orientation acoustically connected to the apertures. A housing is mounted to the phasing plug and received within the cavity, the housing having an outer surface spaced from the inner surface of the bottom portion to form a waveguide arranged to radiate sound waves downwardly and outwardly with asymmetric vertical directivity.

The invention provides a petal-shaped homogeneous phase nonlinear rotating beam generation method based on phase regulation and control. By designing a phase distribution function with spiral symmetry and combining dynamic regulation and control of morphological parameters and transmission distance, petal-shaped light beams with different petal numbers, rotation angles and energy distribution can be generated. The light beam shows a homogeneous phase characteristic, high directivity and a stable vortex structure in propagation, is especially suitable for the field of optical tweezers, forms a high-intensity focusing area by adjusting spiral symmetrical phase distribution, and can stably capture micron-sized particles.

The present invention discloses a microwave topological photonic crystal metasurface antenna, which belongs to the field of communication technology. The present invention adopts a layered structure similar to a patch antenna, including a ground plate, a dielectric layer, a topological photonic crystal, a rectangular metal frame, and a microstrip feeder arranged from bottom to top. The topological photonic crystal is arranged above the dielectric layer, the rectangular metal frame is coated on the periphery of the topological photonic crystal, and the microstrip feeder is connected to the rectangular metal frame. The present invention can achieve multi-band characteristics and extended bandwidth. In addition, most of the electromagnetic waves propagated by the antenna within the band gap range are suppressed, and only electromagnetic waves of the angular state frequency can propagate, with smaller return loss, and the topological angular state can achieve unidirectional radiation, with better directivity at high frequencies. As a result, the antenna performance is greatly improved, which is very suitable for on-chip optical interconnection and photonic chip integration, and meets the needs of 5G / 6G communications, quantum computing, etc. for miniaturized devices.

Wideband waveguide slot-based bi-directional couplers are combined with waveguide load pull tuners for true vector load pull at sub-THz frequencies. Coupling is constant and Directivity is above average up to 170 GHz and can be extended to 330 GHz and are controlled by the shape, size, and configuration of the slots between the main tuner waveguide and the adjacent coupler waveguide. A calibration method allows full characterization of the coupler-tuner assembly.

The present subject matter provides an RFID device configured to provide improved antenna gain and directivity. The RFID device includes an antenna, a metamaterial (MTM) array, and a substrate. The substrate includes a first surface and a second surface, and the antenna includes a bottom surface and a top surface. The bottom surface of the antenna and the MTM array are formed on the first surface of the substrate. The antenna and the MTM array are separated by a gap. The antenna is formed from a first conductive material defining an area surrounded by a first perimeter. The antenna includes a nesting slot. The MTM array is formed from a second conductive material defining an area surrounded by a second perimeter.

The invention is suitable for the technical field of acoustics, array signal processing and sonar, and provides a broadband high-gain beam pattern optimization method suitable for any array. S1, calculating a weight vector matrix of each order of eigen beams; s2, solving a broadband weighting matrix through CVX; s3, synthesizing a broadband high-gain beam pattern; according to the method, the optimal beam pattern is decomposed into characteristic beams with different robustness and directivity based on generalized characteristic decomposition, under the constraint of expected beam pattern performance, the joint weighting coefficient of each order of characteristic beams is optimized, the broadband weighting matrix of the characteristic beams is calculated, and the final broadband high-gain beam pattern is synthesized according to the weighting coefficient. According to the method, the broadband high-gain beam pattern can be obtained under the constraint condition, meanwhile, the effects of constant beam width, robustness and high gain are achieved, compared with a method disclosed in the prior art, the directivity of a beam former is higher, and the method is suitable for any array.

The utility model provides an ultra-wide-band high-performance array antenna, which comprises a plurality of ultra-wide-band oscillator units arranged on a reflecting substrate in an array form, the ultra-wideband oscillator unit comprises a plurality of radiation parts arranged on the dielectric plate at intervals, and the radiation arm of any radiation part and the radiation arm of the adjacent radiation part are collinear to form a dipole; in one radiation piece, any two adjacent radiation arms are perpendicular to each other to form a dual-polarized oscillator; the ultra-wideband oscillator unit further comprises a parasitic branch knot. The parasitic branches are arranged between every two radiation pieces, and the parasitic branches are arranged on the dielectric plate in the horizontal direction and the vertical direction; the radiation part and the parasitic branch knot are coupled and connected to form a frequency expanding structure. According to the utility model, the S parameter of the oscillator unit is optimized by arranging the coupling frequency-broadening structure and the parasitic branch knot, electromagnetic waves are guided through the cooperation of the reflecting strip, the isolating strip and the director, the interference of high frequency to low frequency is reduced, the standing-wave ratio of the antenna is further reduced, and the directivity of the antenna is improved.

The invention discloses an electrostatic-force-magnetostatic coupling characteristic analysis method for a three-dimensional low-frequency magnetoelectric antenna. The method comprises the following steps: establishing a geometric model of the three-dimensional low-frequency magnetoelectric antenna and setting material parameters and boundary conditions; establishing a three-dimensional model of the three-dimensional low-frequency magnetoelectric antenna based on the geometric model, the material parameters and the boundary conditions; subdividing the three-dimensional model of the three-dimensional low-frequency magnetoelectric antenna to obtain a cellular structure; based on the cellular structure, constructing an electrostatic-force-magnetostatic coupling equation set; wherein the static-force-static magnetic coupling equation set comprises a piezoelectric constitutive equation, an electrostatic field equation, a mechanical motion equation, a piezomagnetic constitutive equation and a static magnetic field equation; and solving the static-force-magnetostatic coupling equation set by using an FDTD algorithm to obtain physical parameters of each position, and obtaining the magnetic flux density, radiation efficiency, directivity coefficient and gain of the three-dimensional low-frequency magnetoelectric antenna according to the physical parameters of each position. According to the invention, the speed and accuracy of static-force-static magnetic coupling analysis can be effectively improved.

The invention discloses a directional sound wave loudspeaker control method based on MEMS, and relates to the technical field of stereo loudspeakers. By initializing the MEMS array, the microphone array and the control circuit, stable operation of the system is ensured. The microphone array accurately locates a sound source by using a TDOA or beam forming algorithm, and the control circuit calculates phase and amplitude parameters of the MEMS unit to realize high-precision beam forming. The MEMS acoustic metasurface array transmits directional sound wave beams according to parameter adjustment, a microphone in a target area monitors sound wave quality in real time, and a control circuit dynamically and finely adjusts array setting through a feedback optimization algorithm to adapt to environmental changes. The system has the advantages of high-precision positioning, efficient beam forming, real-time optimization and low power consumption, is suitable for scenes such as smart home and virtual reality, and remarkably improves sound wave directionality and quality stability.

The invention discloses a low RCS broadband array antenna based on modification processing and a wave absorbing material and a design method of the low RCS broadband array antenna. The design method comprises the following steps: firstly, designing an ultra-wideband Vivaldi antenna working in an X wave band; then analyzing the radiation and scattering surface current distribution of the antenna in the X wave band, and carrying out shaping processing on the antenna according to a simulation result; performing array design on the designed antenna to form an array antenna; and finally, analyzing the surface current in the radiation and scattering states of the array antenna, covering a higher scattering current area with a wave absorbing material, and reserving a high radiation current area of an antenna slot line area so as to reduce the RCS and reserve the radiation performance of the antenna. The low RCS broadband array antenna is designed by adopting the design method. According to the invention, the design requirements of high gain, high directivity and low RCS of the broadband array antenna are met, the effects of in-band RCS reduction, radiation performance maintenance and multi-angle reduction are considered, and the application of the antenna is expanded.

The invention relates to the field of millimeter-wave phased-array antennas, and discloses a millimeter-wave broadband wide-angle scanning phased-array antenna, and the antenna comprises a protection cover which serves as a frame for bearing an overall structure and is used for protecting a circuit and an electronic assembly; the oscillator array layer is arranged in the protective cover and is used for radiating and receiving millimeter wave electromagnetic signals; the electromagnetic isolation layer is arranged at the bottom of the protection cover and is used for suppressing a mutual coupling effect between the array units and improving impedance matching; and the feed network layer is arranged at the bottom of the electromagnetic isolation layer and is used for accurately distributing signal power to each oscillator unit in the oscillator array layer and controlling the amplitude and phase of each unit signal. According to the invention, the oscillator array layer in non-uniform gold spiral arrangement is accurately driven through the intelligent control and signal processing layer, so that excellent beam directivity and gain retention capability of the millimeter wave antenna during wide-angle scanning are realized, and the problems of beam distortion and sharp gain drop which are easy to occur during wide-angle scanning of the millimeter wave antenna are solved.

Some examples of the techniques described herein may utilize distributed antennas with directivity gain. Distributed antennas may also be utilized as a passive reflector to assist one or more user equipments (UEs) with relatively weak links to a network entity. In some approaches, distributed antennas may achieve directivity while avoiding or reducing increased power consumption. The distributed antennas may also be utilized as a passive reflector when not used for active transmission or reception. For example, distributed antennas may be utilized as a reconfigurable intelligent surface (RIS). A RIS may include a set (e.g., an array) of passive reflecting elements, which can adjust signals incident on the surface via one or more phase shifts of the elements.

The invention discloses a fault cable rough measurement positioning auscultation system and method based on a vector microphone. The system comprises a sound acquisition unit, a circuit board and a power supply unit, wherein the sound acquisition unit is used for acquiring a detection signal of a cable, and the circuit board is connected with the sound acquisition unit and is used for processing the acquired detection signal to obtain a rough measurement positioning result of a cable fault. According to the scheme, cable discharge sound waves can be picked up to the maximum extent through direct contact with the cable, attenuation of sound in cross-medium transmission is reduced, and sound information is picked up through the two sets of high-directivity vector microphones according to the characteristic that the transmission loss of the sound in the same medium is minimum aiming at faults of the calandria cable, so that the transmission efficiency of the calandria cable is improved. The direction of the fault point is judged through operation of the circuit board, the range of the fault point can be quickly positioned only by repeatedly detecting the cable wells closest to the two sides of the fault point after the minimum range of the fault point is positioned, manpower and material resources are greatly saved, and the positioning time is shortened.

The invention discloses a microphone array layout optimization method based on IGSA, and belongs to the field of sound source localization. The method comprises the following steps: firstly, constructing a topological structure of a microphone array as a rectangular array; then, the directivity and the directional diagram of the microphone array are adopted to express the performance of the microphone array; constructing a fitness function through the width of a main lobe, the level of a side lobe and the number of microphones; then, on the basis of a genetic algorithm, improving crossover and mutation steps, adopting a hierarchical crossover strategy and a similarity regulation and control mutation strategy, and simultaneously optimizing an array structure by a simulated annealing operator in an interspersed manner; and finally, outputting the optimal microphone array arrangement to meet the requirements of low sidelobe performance and high resolution. The IGSA algorithm is adopted to optimize the microphone array layout, so that more accurate global optimization, faster convergence speed and better multi-target balance are realized, and particularly, the number of microphones and the hardware cost are remarkably reduced while the sound source localization performance is ensured.

Provided in the present application is a terminal device, which comprises a metal ground plane, a radiating element and a feed source. The radiating element is arranged adjacent to and in parallel with a predetermined side of the metal ground plane, and the projection thereof on the predetermined side of the metal ground plane is located within the predetermined side. The radiating element comprises at least one connection portion connected to the predetermined side of the metal ground plane. The feed source is electrically connected to the radiating element and is used for exciting the radiating element to generate an excitation current conducted in a first direction, so that the predetermined side of the metal ground plane generates a ground plane current, wherein the direction of the ground plane current in a first region in the predetermined side of the metal ground plane corresponding to the radiating element is a second direction, and the direction of the ground plane current in a second region in the predetermined side of the metal ground plane is the first direction, the second region being adjacent to the first region, and the second direction being opposite to the first direction. The radiating element comprises a main element of which the electrical length is 1 / 2 of the wavelength corresponding to a preset frequency band. Such a current distribution reduces the directivity coefficient after vector superposition of far-field radiation electric fields, thereby improving the omnidirectionality of antennas.

An antenna device including a transparent antenna element that can be provided at a position visible from outside of a transparent cover of an electronic apparatus is provided.An antenna device includes a flexible substrate that is transparent and that is to be provided on an inner surface side opposite to an outer surface of a transparent cover, made of glass or resin, of an electronic apparatus, and an antenna element that is transparent and that is to be provided at a position, of the flexible substrate, that is visible from outside of the transparent cover, the antenna element having a directivity oriented toward an outside of the electronic apparatus.

The utility model relates to a miniaturized high-gain planar yagi antenna which comprises a base material, a pair of transmitting oscillators are printed on the upper plane of the base material and used for transmitting or receiving signals, and the two transmitting oscillators are connected in series and are connected and led out through a coaxial line. And a parasitic director oscillator is printed on the upper plane of the base material above the two transmitting oscillators and is used for enhancing directivity. According to the invention, the yagi antenna is adjusted from a stick-shaped three-dimensional structure to a structure in which the radio frequency microstrip line is printed on the epoxy glass fiber board base material, so that the whole yagi antenna is flat, small in size and high in gain, and is convenient to install due to the addition of the plugging pins.