201 results about "Conformal antenna" patented technology

The invention relates to a method for testing an RCS (radar cross section) of a low-scattering conformal antenna based on two-dimensional microwave imaging, which is characterized by comprising the following steps: carrying out an RCS test on a metal envelope and a low-scattering conformal antenna in an installed state so as to obtain a two-dimensional microwave image; carrying out two-dimensional Fourier transform on the obtained new two-dimensional microwave image so as to obtain the data of a target spectral domain; carrying out an RCS test on a metal ball (the RCS of the metal ball is known) so as to obtain a two-dimensional microwave image, then carrying out two-dimensional Fourier transform on the obtained two-dimensional microwave image so as to obtain the data G0 (f, theta) of a scattered field of the metal ball, wherein the data of the scattered field varies with frequency and angle; and finally, obtaining the RCS of the conformal antenna, wherein the RCS of the conformal antenna meets the following formula: RCS= G1 (f, theta) (of the conformal antenna) - G0 (f, theta) (of the metal ball) + RCS (of the metal ball). The method provided by the invention is a method for testing an RCS (radar cross section) of a low-scattering conformal antenna in an installed state based on the two-dimensional microwave imaging technology, and after practicing, the obtained effect is good, therefore, the method provided by the invention has great engineering popularization value.

The invention discloses a phase interferometer based on a broadband conformal antenna array and a parameter estimation method thereof. The phase interferometer is characterized by comprising a five-unit Vivladi conformal antenna array, a streamline ceramic antenna housing and a metal connecting ring on the antenna housing, wherein the number N of antenna units of the five-unit Vivladi conformal antenna array is 5, each unit is shaped on the surface of the antenna housing, the antenna units and the antenna housing are conformal, and the units are arranged circumferentially to form a ring array. The phase interferometer is suitable for a missile-borne passive direction finding system, and the estimation algorithm for electromagnetic parameters of radiation source signals is also applicable in relevant fields of electronic reconnaissance, electronic countermeasure and the like and has more comprehensive parameter measurement performance and platform adaptability.

The invention relates to a low-profile conformal antenna, which comprises a feed network, a dielectric substrate, a metal sheet and a metal back cavity plate which are fixedly connected in a layered manner in sequence. The overall low-profile conformal antenna is in an arc-shaped lath form; the profile height is 1/30-1/50 of wavelength of the center frequency of the low-profile conformal antenna and is much less than those of a waveguide slot antenna and a microstrip patch; and the requirement of a modern carrier on low air resistance is met. The feed network comprises an input end and at least four output ends; at least four radiating slots are evenly distributed in the metal sheet; at least four cavities are evenly distributed on one side surface of the metal back cavity plate; and a coaxial feed joint is arranged at the middle part of the other side surface of the metal back cavity plate. More than two low-profile conformal antennas are connected in parallel to form a low-profile conformal antenna array. The low-profile conformal antenna easily conforms to various carriers, and is simple in structure and convenient to process.

The invention discloses a sub-array arranging method for a hemispherical array and a spherical conformal antenna array based on a projection method. According to the sub-array arranging method, the less number of sub-arrays and basically similar specifications can be realized, seamless splicing between sub-arrays can be realized, and the signal processing performance can be improved. The arrangingmethod includes the following concrete steps: performing triangular sub-array division on a hemisphere surface, the division step being as follows: constructing a polyhedron tangent to the hemispheresurface, wherein the polyhedron is composed of a plurality of regular n-polygons, and n is a positive integer greater than 2; projecting the center of gravity of the regular n-polygon onto the spherical surface, and connecting the center of gravity projection with each vertex of the regular n-polygon to obtain n triangles; then equally dividing the n triangles by a projection method to obtain a plurality of triangles with approximate sizes and specifications, forming a triangle set and taking the triangle set as a triangular sub-array for dividing the hemisphere surface; adding elements to the triangular sub-array, and arranging the elements evenly in each sub-array.

Some embodiments relate to a multiband antenna array formed on a flexible substrate. Low frequency antenna elements may be formed using nanoink. High frequency elements may be provided on a prefabricated antenna chip. The antenna array may be heated in a low temperature oven to sinter the nanoink into a solid antenna element. In some embodiments, an adhesive insulation layer may be provided which allows the antenna array to be attached to any surface. In other embodiments, the antenna array may be embedded in a composite material.

The invention discloses a 3D printing device for conformal antenna and circuit integrated manufacturing and a method thereof. The 3D printing device is characterized in that electric field driving jetting 3D printing, fusion deposition molding and five-axis linkage 3D printing are adopted for combination so as to achieve integrated manufacturing of a conformal antenna and a circuit; a base body structure of the antenna is manufactured by adopting an FDM technology, and the circuit of the conformal antenna is manufactured by adopting an electric field driving jetting 3D printing technology; self-supporting printing of various complex antenna base body structures is realized by utilizing a FDM nozzle and printing platform five-degree-of-freedom motion, and high-precision conformal printing of an antenna conductive pattern on a complex curved surface is realized on the basis of a five-axis linkage platform and an electric field driving jetting 3D printing nozzle; the FDM nozzle is used for supplying a printing consumable by adopting a wire feeding mechanism, and then the needed supply of the printing consumable is realized; and synchronous sintering and curing of the printed circuit are realized by adopting an in-situ laser sintering technology; and a CCD camera is adopted to assist in positioning, and the circuit printing process is monitored in real time. The device and the method have various advantages and wide industrial application prospects.

On the basis of defining the concept of a spacecraft solar panel conformal antenna, the invention discloses S1, a spacecraft solar panel conformal antenna structure; S2, a spacecraft solar panel conformal antenna array structure; S3, a spacecraft solar panel conformal antenna array feeding mode; S4, a spacecraft solar panel conformal antenna beam control network; S5, a spacecraft solar panel conformal antenna microwave signal transmission line; S6, a connecting method of the spacecraft solar panel conformal antenna and a spacecraft. The spacecraft solar panel conformal antenna has the advantages of reducing the spacecraft launching cost, prolonging the in-orbit service life of the spacecraft, reducing the fairing requirement, facilitating appearance attractiveness of the spacecraft, improving spacecraft maneuverability and safety, and being high in replicability and good in expandability. Multiple solar panel conformal antennas with different orbit heights and types can be applied through networking, and cover with a bigger bandwidth range and a wider spatial range can be achieved through mission planning. Besides, the conformal antenna thought can be expanded to the field of interstellar probe antennas. The spacecraft solar panel conformal antenna has a wide application prospect.

An RF signal transition includes a channelized microstrip transmission structure, and a coplanar wave guide structure in electrical communication with the channelized microstrip transmission structure. A caged troughline transition structure is in electrical communication with the coplanar wave guide structure. A caged coaxial transmission structure is in electrical communication with the troughline transition structure. The signal transition may be embedded in a flexible printed wiring board structure with a circulator for a conformal antenna structure.

The invention discloses an implantable passive ultrahigh frequency RFID temperature sensing tag for animal breeding. The implantable passive ultrahigh frequency RFID temperature sensing tag comprises a metal conformal antenna outer shell, high-dielectric-constant dielectric materials and an RFID tap chip for collecting animal temperature information and sending the animal temperature information in a radio frequency signal mode. The high-dielectric-constant dielectric materials are arranged inside the metal conformal antenna outer shell, the RFID tap chip is embedded into the bottoms of the dielectric materials, and the operating frequency band of the RFID tag chip is an ultrahigh frequency band. The invention further discloses a sensing method of the implantable passive ultrahigh frequency RFID temperature sensing tag for animal breeding. According to the implantable passive ultrahigh frequency RFID temperature sensing tag, a sensor is integrated, and the implantable passive ultrahigh frequency RFID temperature sensing tag is low in tap falling rate, long in recognition and reading distance, low in requirement for biology compatibility, small in size and low in price.

The invention discloses an antenna array fault diagnosis method based on sparse Bayesian learning, and relates to the field of antenna array signal processing. The method includes: measuring the voltage of a fault array by employing a probe at a plurality of measuring points of a near-field area; then performing sparse processing on a measured voltage data vector (performing difference operation on the measured voltage data vector and a near-field voltage data vector of a faultless array), and reconstructing an excitation vector of the fault array through a sparse Bayesian learning algorithm by employing the sparse data vector; and then calculating the quantity and the positions of array elements according to the excitation vector obtained by reconstruction to realize the goal of the method. Compared with the conventional array fault diagnosis algorithm, according to the method, the required near-field data samples are less, the success rate of diagnosis is higher, and the method can be applied to a conformal antenna array in any three-dimensional structure.

A telemetry component according to an embodiment of the invention, such as a programmer or a monitor for an implantable medical device (“IMD”), includes at least one radio frequency (“RF”) antenna that is configured to accommodate far-field telemetry between the telemetry component and the IMD. The RF antenna is shaped, sized, positioned, and otherwise configured to account for surface current cancellation caused by induced surface current on an electrically conductive surface of the telemetry component.

A wireless engine monitoring system (WEMS) includes an engine monitoring module that is mounted directly on an aircraft engine and records, stores, encrypts and transmits full flight engine data. The system preferably interfaces to the Full Authority Digital Engine Controller/Engine Control Unit (FADEC/ECU) and can record hundreds of engine parameters with a preferred sampling frequency of about one second. The engine monitoring module is preferably formed as a miniaturized module directly mounted on the aircraft engine within its cowling and has a conformal antenna. The monitoring module can also upload data for onboard processing.

The invention discloses a miniaturized low profile ultra-wideband logarithmic periodic monopole array antenna, which is characterized by using 22 monopoles operating at different frequencies to realize ultra-wideband characteristics. A radiation directional pattern is directed to the end-fire direction of an array. Part of the monopoles introduce a capacitor to reduce the profile of the overall cell by loading a plate capacitor to the top end; and a substrate with a higher dielectric constant is used to miniaturize a feeding line and the overall structure. The invention can satisfy the standing wave ratio VSWR (2.5, the height of the profile is 0.053 Lambda <l>, and the width is 0.061 Lambda <l> in the bandwidth range of 10.7:1, wherein the Lambda <l> is the wavelength corresponding to thelowest frequency point in the free space. The invention has the advantages that the vertical polarization end-fire directional pattern can be stably realized in the ultra-wideband range, and has thecharacteristics of low profile, compact structure, easy conformality and simple design. The design method and the result can provide theoretical guidance and performance evaluation methods for an airborne platform antenna unit and array, and can provide a new idea for solving conformal antennas on metal body platforms.

The present invention discloses a conformal antenna array seeker modeling simulation method. The method comprises: S1. selecting rectangular microstrip patch antenna elements as directed radiation antenna elements of a conformal antenna array seeker, and performing location configuration on the rectangular microstrip patch antenna elements according to a shape of a seeker carrier platform, wherein a plurality of rectangular microstrip patch antenna elements form an antenna array; S2. applying a mathematical relationship of Euler rotation transformation to complete derivation of a far-field radiation pattern function of the conformal antenna array seeker; and S3. applying a genetic optimization algorithm to optimally design a far-field radiation pattern of the conformal antenna array seeker. By use of the method disclosed by the present invention, a radar diffusion cross section of the seeker can be reduced, an excellent electromagnetism stealth property is achieved, and the highest sidelobe value of the far-field radiation pattern is significantly improved.

The invention discloses an embedded broadband dually-polarized antenna. The antenna comprises a first dielectric substrate located on the upper layer, a second dielectric substrate located on the lower layer, a cross-shaped gap radiation structure etched under the first dielectric substrate, a first microstrip line located on the first dielectric substrate, a second microstrip line located under the second dielectric substrate, a first metal via hole located in the tail end of the first microstrip line and connected with the gap radiation structure in a short-circuit mode, a second metal via hole located in the tail end of the second microstrip line and connected with the gap radiation structure in a short-circuit mode, a first feed coaxial line, a second feed coaxial line and a metal cavity structure located under the first dielectric substrate and connected with the gap radiation structure. The impedance of the antenna is 32% larger than the bandwidth, the degree of isolation of two ports is larger than 46 dB, a radiation pattern is stable, and the antenna is simple in structure and easy to process and has good application prospects in the wireless communication field and the conformal antenna field.

The invention discloses a missile-borne miniaturized multi-frequency-band reconfigurable conformal antenna. The antenna comprises a radiation antenna layer, an antenna frequency band switching controlunit and frequency selection surface layers. The radiation antenna layer comprises a dipole antenna; the antenna frequency band switching control unit is connected with the dipole antenna on the radiation antenna layer, and is used for switching the working frequency bands of the dipole antenna to realize the reconfigurable frequency of the dipole antenna, wherein the number of the frequency selection surface layers is matched with the number of the working frequency bands of the dipole antenna; the number of the frequency selection surface layers is determined according to the number of theworking frequency bands of the dipole antenna; each frequency selection surface layer corresponds to the dipole antenna with a working frequency; and each frequency selection surface layer comprises asubstrate and a gap array arranged on the substrate. The frequency selection surface layer can resonate with the working frequency of the dipole antenna by designing the width of the substrate and the shape and the size of the gap array, so that a directional radiation function of an antenna system is realized.

The invention discloses an emission waveform design method of a conformal MIMO radar system under a multi-path condition, comprising steps of giving a detection range of an azimuth Theta of a conformal matrix MIMO, wherein the detection range is [Theta min, Theta max], and a detection range ( Phimin Phimax) of a pitch angle Phi, and setting quantity of matrix elements of the conformal matrix antenna as N, (2) setting the quantity of multi-path points contained by the ith matrix elements of the conformal antenna as Mi, (3) setting an expected detection direction (Thetad Phid ) of the conformal matrix MIMO radar system and setting a main lobe width W Theta of the emission direction image expected by the conformal array MIMO radar system on the direction dimension and a main lobe width (wPhi)of the pitching dimension, and calculating the emission direction map Bp expected by the conformal matrix MIMO radar system, (4) constructing the design norm of the wave form matrix S of the conformal MIMO radar system according to the emission direction map Bp expected by the conformal matrix MIMO radar system, and (5) obtaining the wave form matrix S <->of the conformal array MIMO radar system.

The invention provides the two-grade digital channelization receiving device of a passive radar. The device comprises a one-grade digital channelization receiving module, a one-grade effective channelselection module, a two-grade digital channelization receiving module and a two-grade effective channel selection module. After two-grade digital channelization receiving and selection, the amplitudeand the phase value of a signal in an effective channel are acquired. The device is suitable for most passive radar signal processing systems. For different sampling rates and frequency band width requirements, a design module with flexible and selectable parameters is packaged, the modularization and the generalization of a design are realized and a design period can be greatly shortened. The requirements of a passive conformal antenna radar to signal detection sensitivity and a signal to noise ratio are satisfied. Through two-grade channelization processing, the sensitivity and the signal to noise ratio are effectively increased. After two-grade channelization combination processing, a signal to noise ratio gain is about 17dB. Through adopting two-grade digital channelization receiving,operation resources are reduced and chip power consumption is decreased.

The invention discloses an infrared radiation transmitting conformal millimeter wave antenna, which consists of an infrared radiation transmitting window substrate, thin film chips, a thin film ground strap and a feeder line, wherein the feeder line forms good ohmic contact with the thin film chips; the thin film chips are arranged on the inner surface of the window substrate at intervals; the feeder line is oppositely positioned on the inner surface of the window substrate; and the thin film ground strap is covered on the outer surface of the window substrate. A millimeter wave antenna is integrated on an infrared window of the conventional infrared detection equipment on the basis of the conventional millimeter wave antenna technology to form a millimeter wave/infrared dual-mode detection conformal antenna which is used for realizing millimeter wave/infrared dual-mode shield-free, coaxial, common-caliber and conformal composite detection and identification.

The invention discloses a drifting detection underwater robot device and a control method, and belongs to the technical field of detection underwater robots. A robot main body is of a torpedo-shaped structure; hydrologic detection equipment ADCP (Acoustic Doppler Current Profiler), ranging sonar and an emergency load rejection device are carried at the fore body of a robot; a pressure-resistant cabin is arranged at a middle cabin section; the pressure-resistant cabin is divided into an energy source cabin and a control cabin; two high-energy density lithium batteries are arranged in the energysource cabin and are correspondingly used for supplying power to a power system and a control system; a conformal antenna (comprising Beidou positioning and communication, radio and WiFi), DVL, a depthometer and ranging sonar are carried at the tail section; high-efficiency propellers are arranged on the left side and the right side of the tail of the robot; and vertical channel propeller is arranged at each of the front and rear of the robot. According to the surrounding environment and task instructions of the robot, the effect of selecting to start or close a drifting mode is intelligentlyrealized, so that low-power-consumption, long-voyage and long-time detection monitoring tasks are realized.