508 results about "Parabolic antenna" patented technology

The invention provides a Ku/Ka frequency band circularly polarization integrated receiving and transmitting feed source antenna applied to antenna systems, such as a paraboloid antenna and the like, in satellite communication. The antenna adopts a coaxial nested compact structure, and is applied to Ku frequency band and Ka frequency band at the same time. The basic structure of a feed source comprises a circular waveguide, on which a pointed cone shaped dielectric rod is loaded, a flange, a coaxial waveguide, a symmetrical SMA connector pair, a circular polarizer and an orthogonal mode coupler, wherein the feed source in the Ka frequency band is applied to dual circular polarization, has rotary symmetrical radiation directional diagrams, the circularly polarization axial ratio in Ka double band is smaller than minus 2dB, and the transmitter-receiver isolation is smaller than minus 70dB; and the feed source in the Ku frequency band is applied to dual circular polarization, has rotary symmetrical radiation directional diagrams, a cross polarization level smaller than minus 40dB, and good transmitter-receiver isolation and reflection loss.

A rotational antenna includes a stationary feed which is disposed in a substantially vertical orientation. A parabolic dish is rotationally mounted about the stationary feed in a state of being tipped with respect to the stationary, substantially vertically oriented feed. The rotational parabolic antenna may alternatively be provided with a rotating radio frequency (RF) and acoustic feed. Other embodiments are disclosed.

The invention provides a seven-revolute pair extensible unit and a space extensible mechanism using same, and relates to a single-closed loop and single-freedom degree space extensible mechanism aiming at solving the problem that the existing five-revolute pair mechanism is rigorous in geometric parameter requirement, poor in extensible performance, low in reliability, and not suitable for a large-size space extensible mechanism. A plurality of first extensible units are single-closed loop and single-freedom degree extensible units, a plurality of first extensible unit ring arrays are arranged on a common base, and every two adjoining first extensible units are formed into a first space extensible mechanism by a common first connecting rod or a common sixth connecting rod; and a plurality of second extensible units are single-closed loop and single-freedom degree space extensible units, a plurality of second extensible unit ring arrays are arranged on the common base, and every two adjoining second extensible units are formed into a second space extensible mechanism by the common first connecting rod or the common second connecting rod. The invention is suitable for a support frame of a satellite parabolic antenna and a solar battery array.

According to various embodiments, a parabolic antenna may include a radome with an optically transparent window. The parabolic antenna may include a feedhorn socket configured to receive a feedhorn assembly. The feedhorn socket may also be configured to receive a spotting scope. According to various embodiments, the spotting scope may be mounted in place of the feedhorn assembly and used to optically align the parabolic antenna with respect to a distant target. The optically transparent window positioned in the radome may allow a user to see through the radome. Once aligned, the spotting scope may be removed from the feedhorn socket. A feedhorn assembly may then be secured in the feedhorn socket and a radio unit coupled thereto for radio frequency transmission.

The invention relates to a steerable antenna platform including two independently controllable motors for rotating a flat plate or a parabolic dish antenna about two perpendicular axes. The antenna platform includes a semicircular yoke rotatable about a fixed axes with bearings mounted on either end thereof for pivotally supporting the antenna. The antenna platform also includes a ball joint for supporting the center of the antenna, enabling a reduction in the requirements of the two motors.

The invention discloses an initial form design method of a deployable offset parabolic antenna cable set structure. In the method, the cable net structure initial form design includes front cable net design and rear cable net design. During the front cable net design, coordinates of front cable net nodes and cable force act together as design variables, and tensions of all internal cable sections of the front cable net are equal and the ratio of the maximum tension of the boundary cable to the maximum tension of the internal cable section is minimum on conditions that all boundary nodes are fixed and all the internal nodes are on the ideal paraboloid, in force-balance states and capable of covering effective optical aperture completely. During the rear cable net design, the minimization of the ratio of the tension level of the rear cable net to that of the front cable net is achieved on the condition that an adjusting cable keeps vertical and the relation among the total height of the antenna, the height of the front cable net and the minimum length of the adjusting cable is met. Therefore, node coordinates and cable force of the front cable net and the rear cable net are acquired to complete the initial form design.

The invention relates to a MMAOP framework applicable to a terahertz radar and communication system. The implementation mode that a multiplier, a mixer, an array, the quasi-optics and a parabolic antenna are combined is adopted for the MMAOP framework, an all-solid high-power terahertz radiation source is obtained, and meanwhile the MMAOP framework is applicable to the terahertz radar and communication system. A receiving link and a transmitting link of the framework are both obtained in an all-solid mode, and thus the MMAOP framework is good in repeatability and can be integrated and be smaller conveniently. According to the framework, the output power of the terahertz source is raised with an array space power synthesis method, and thus the expansibility is good; a small array can be adopted first to acquire medium output power, as the technology improves, the number of arrays is gradually increased, the output power of a single array element is raised, and thus the radiation power is raised.

The invention discloses a millimeter wave imaging system for security check and an imaging method thereof, wherein the system comprises a millimeter wave MMIC receiver array, a parabolic antenna, a two-dimensional mechanical scanning rotary table and a signal processing unit; the millimeter wave MMIC receiver array is connected with the signal processing unit, a feed source antenna of the millimeter wave MMIC receiver array is placed on the focal plane of the parabolic antenna, and both the millimeter wave MMIC receiver array and the parabolic antenna are fixed on the two-dimensional mechanical scanning rotary table. The imaging system of the invention has simple structure and high stability and can effectively detect hidden arms on a human body.

The invention discloses a three-axis stable follow-up tracking device of a shipborne satellite antenna. The three-axis stable follow-up tracking device of the shipborne satellite antenna comprises a parabolic antenna (1), a roll rotary shaft (2), a pitching rotary shaft (3), as azimuth rotary shaft (4), a support (5) and a base seat (6). Due to the adoption of a three-axis rotation device formed by the components and the technical scheme including that the azimuth rotary shaft is fixedly connected in the center of the bottom of the base seat in a vertically upward mode, the center of a cross beam of the support is rotationally connected at the upper end of the azimuth rotary shaft, the pitching rotary shaft is rotationally and horizontally arranged on the upper portions of two stand supports of the support, the roll rotary shaft is located above the center position of the pitching rotary shaft and in rotational orthogonality connection with the pitching rotary shaft, the parabolic antenna is fixedly connected on the roll rotary shaft, and a feedback system composed of a photoelectric sensor, a position potentiometer, an angular velocity sensor, an electronic compass, a rotary encoder and a global position system (GPS) receiver is adopted to replace a gyro system, the shipborne satellite antenna is enabled to achieve the purposes of being simplified in structure, lowered in cost, and easy to civilianize.

The invention relates to a method and system for automatically tracking a medium earth orbit navigational satellite through a servo antenna, and belongs to the technical field of satellite navigation signal quality monitoring. The system comprises an information prediction unit, a servo control unit, a rotary table unit, the feed-forward large-diameter parabolic antenna and a spectrum analyzer. The information prediction unit is used for the operation of orbit prediction and angle calculation, the servo control unit is used for adjusting antenna postures in a closed loop feedback mode, the rotary table unit is used for driving an antenna rotary table to rotate in the azimuth axial direction and in the pitch axial direction, the feed-forward large-diameter parabolic antenna is used for receiving target satellite signals, and the spectrum analyzer is used for observing quality of received signals. The method and system for automatically tracking the medium earth orbit navigational satellite can achieve an ideal tracking effect in the state of being divorced from manual monitoring.

The invention provides a rigidizable inflatable deployment radial rib brace type offset parabolic reflector antenna, relating to a parabolic antennal. The aim of the invention is for solving problems that the antennal used for satellites of existing mechanical structure has low unfolding or folding efficiency, great weight and high cost, and low unfolding reliability in the folding course caused by complex driving mechanism. One side of a plurality of radial ribbed slabs of the invention are all connected with a central drum and the other side of a plurality of radial ribbed slabs are all connected with an inflatable support ring by a hanging guy. An elastic reflecting surface net is arranged on the lower side of a plurality of radial ribbed slabs and one side of three inflatable support tubes are all connected with the inflatable support ring. The whole antenna is in curling and folding state initially, and the inflatable support tubes are firstly aerated after entering after injection. The invention combines the radial ribs autologous rebound force to unfold the whole reflector structure under unfolding pulling of the inflatable support tubes and the inflatable support ring, and the invention can maintain the structure shape of the antenna without continuous aerating after the inflatable support tubes and the inflatable support ring are completely rigidized and hardened.

The invention provides an absorption-rate-adjustable bandwidth electromagnetic wave absorber based on a graphene film, and aims to solve the technical problems of high cost and poor practicability in the conventional absorption-rate-adjustable bandwidth electromagnetic wave absorber based on the graphene film. The absorption-rate-adjustable bandwidth electromagnetic wave absorber comprises a conductive layer and a dielectric layer which are laminated one above the other, wherein the conductive layer comprises a metal patch and a graphene film attached to the lower surface of the metal patch; a plurality of cross-shaped gaps of different forms are etched into the metal patch to form M*N patch units; each patch unit consists of m*n patches; the dielectric layer comprises a first dielectric plate, a second dielectric plate and a third dielectric plate which are laminated from top to bottom; a bottom plate is printed on the lower surface of the third dielectric plate; a direct-current power supply is connected between the graphene film and the second dielectric plate, and is used for adjusting surface conductivity of the graphene film. The absorption-rate-adjustable bandwidth electromagnetic wave absorber has the advantages of low cost and high practicability, and can be applied to occasions requiring an intermittent wave-absorbing feature such as a paraboloid antenna and an aircraft surface.

Provided is a parabolic antenna that suppresses leakage of radio waves with a simpler configuration. The parabolic antenna includes a horn that transmits and receives signals; a feed that supports the horn and relays the signals the horn transmits and receives; a reflector that reflects the received signals to focus the received signals on the horn and reflects the signals from the horn to transmit the signals; a reflecting mirror supporting member that supports the reflector; and a feed fitting adapter that enables the feed to be fitted into the reflecting mirror supporting member. A choke groove is formed in at least one of a joint area between the reflecting mirror supporting member and the reflector and a joint area between the reflecting mirror supporting member and the feed fitting adapter, which suppresses propagation of radio waves traveling through the gap of the joint area.

A parabolic antenna comprising at least a reflector of deformable material, the reflector having a parabolic shape of a preferred curvature, and a rigid structural substrate comprising a foam sufficient to maintain the parabolic shape of the reflector against significant deviation from said parabolic shape. The deformable material of the reflector is characterized by its inability to maintain the parabolic shape of a preferred curvature in the absence of the rigid structural substrate. A method of forming the inventive antenna is disclosed, comprising the steps of: Providing a backing section and a reflector made of deformable material, the backing section and reflector being mateable to define a hollow interior cavity; maintaining the reflector on a forming die in conformance with a preferred curvature of the reflector; and injecting an expandable, foam slurry into the hollow interior cavity and curing the foam slurry to form the antenna.

A radio communication route enables communication from an originating ground station to a destination ground station via one of multiple randomly orbiting satellites with no active attitude control. The ground stations and satellites include multi-feed parabolic antennas for receiving radio signals from and transmitting radio signals in multiple directions. The satellites store an address of a destination ground station from which an initial information signal is transmitted and antenna information identifying the satellite antenna feed on which the initial information signal was received. Plural satellite antennas transmit linking information identifying the satellite to the originating ground station. Data transmissions received at the originating ground station that designate a particular destination are transmitted by the originating ground station using the antenna on which the linking information was received and the satellite retransmits the data transmission using the satellite antenna feed identified by the stored antenna information.

The invention discloses a shaped surface-oriented quick determination method for adjustment quantity of an active panel of a large parabolic antenna. The method comprises the steps of determining an antenna structure model and an actuator supporting node; determining an overall reflection surface shape of the large parabolic antenna under two working modes, and determining a fitting equation of a shaped surface; extracting node information of the active panel on the refection surface; calculating a target curved surface with minimum fitting root mean square error with the shaped surface; determining corresponding nodes of the panel and the target curved surface, and calculating an actuator adjustment quantity; calculating axial errors of all nodes of the adjusted overall reflection surface; calculating an antenna gain using an electromechanical coupling, judging whether the antenna gain meets the requirement, and outputting an optimal actuator adjustment quantity. By adopting the method, the optimal adjustment quantity of the active panel actuator of the antenna can be directly and accurately adjusted, so that the adjusted overall reflection surface of the antenna is closer to the shaped surface, the electric performance of the antenna can be obviously improved, and an accurate surface shape conversion function of the large parabolic antenna under two working modes is realized.

The invention relates to a satellite antenna. The invention discloses a method for controlling a moving carrier satellite antenna receiving and tracking system. The method comprises the following steps that: the zero positions of the azimuth angle and pitch angle of a parabolic antenna are positioned firstly, and then an antenna control unit receives geographical longitude and latitude signals of a GPS and calculates the azimuth angle and pitch angle of the parabolic antenna to a satellite; the parabolic antenna is lifted up to the corresponding position according to the calculated azimuth angle and the pitch angle, then begins to carry out large-scale search, in the process of searching, the antenna control unit constantly acquires the block level of the satellite, and when the block level of the satellite changes, the antenna locks the satellite; and when the satellite is locked by the antenna, the parabolic antenna is immediately changed into the state of tracking, and in the state of tracking, the parabolic antenna eliminates error signals according to a electronic beam scanning method so as to make the parabolic antenna constantly aim at the satellite. The method for controlling the moving carrier satellite antenna receiving and tracking system has the advantages of high tracking precision, low cost and long service life.

The invention discloses a solar radio burst spectrum device based on a high speed AD acquisition card to analyze and study solar radio burst at different time and frequency resolutions. The system comprises a parabolic antenna, a low noise amplifier, the high-speed AD acquisition card, a computer, a high-speed solid state hard disk, c language processing software, FPGA internal threshold judgment software, Matlab processing software and labview processing software. The device amplifies a solar radio signal and sends the signal to the FPGA in AD conversion digital quantity. The sum of the power spectrum is acquired. When the sum is greater than a set threshold value, solar radio burst occurs, and the system intensively collects data. When the sum is less than the threshold value, solar radio burst does not occur, and the system sparsely collects data. The data are uploaded to a computer through a PCIe interface and are stored in the solid-state hard disk. At night, FFT operation of different length is carried out on the stored data to acquire a solar radio burst intensity graph at different time and frequency resolutions.

Systems and methods for transmitting and receiving radio waves includes a parabolic dish, a focal plane antenna array configuration antenna elements arranged in a circular array configuration with array elements positioned along circumference of rings with a distance between each element and coupled a focal disc positioned along a focal plane of the parabolic dish. The array is configured to transmit and receive radio beam patterns with one or more Orbital Angular Momentum states ‘l’ via a transceiver feed assembly. The transceiver includes a transmitter adapted to alter excitation phase of the radio beams of successive elements and generate helical wave fronts in the far-field, and a receiver to enhance the received wave fronts. A total field received by the array configuration is then calculated by a superposition of the fields received by each of the elements.

The present invention discloses a Cassegrain satellite television antenna comprising a metamaterial plate. The metamaterial plate comprises a core layer. The core layer comprises core sublayers. Each core sublayer comprises a circular area and a plurality of annuli distributed around the circular area. According to the Cassegrain satellite television antenna of the present invention, the traditional parabolic antenna is replaced with a sheet-like metamaterial plate which is easier to process and has a lower cost. In addition, the present invention also provides a satellite television receiving system equipped with the above-mentioned Cassegrain satellite television antenna.

The invention discloses a high-gain end-fire millimeter wave antenna. A microstrip wire is adopted by the end-fire millimeter wave antenna and is gradually changed to two feed wires, and feed is provided to a radiation unit for radiation. Multiple reflection units are arranged to be a parabola, so electromagnetic wave reflection is realized, the gain of the antenna is increased, and side lobes are inhibited. The working principle of the antenna is similar to that of a parabolic antenna. A reflection branch is used for compensating the gap of a parabola array formed by the multiple reflection units in the position of the feed wires, thereby inhibiting back lobes and increasing the gain. II resonant units are sequentially arranged on extending lines of the microstrip feed wires and positioned in an end-fire direction, thereby focusing wave beams and increasing the gain. The reflection units, the reflection branch and the II resonant units help to change the radiation directional diagram of a dipolar antenna, so the dipolar antenna which is supposed to enable 8-shaped radiation is changed to enable end-fire radiation. Therefore, the gain of the antenna is increased. The high-gain end-fire millimeter wave antenna is suitable for popularization and applications in the technical field of antennas.

The invention provides a satellite-borne dual-polarization millimeter wave radiometer adopting a quasi-optic technique, and is characterized by comprising a parabolic antenna reflecting surface, a feed source, a polarization separator with a waveguide structure and two millimeter wave receivers, wherein the antenna reflecting surface comprises a parabolic primary reflecting surface and a plane secondary reflecting surface which have a certain distance with the parabolic primary reflecting surface; the plane secondary reflecting surface is used for reflecting the horizontal or vertical polarization waves after polarization separation to one millimeter wave receiver; the polarization separator adopts a quasi-optic polarization aperture plate which is formed by fixing metal wires in parallel distribution on a metal frame; g<lambda/2 and d<g, wherein the g represents the spacing between the adjacent metal wires, the d represents the diameter of the metal wires, and the lambda represents the wavelength of the incidence waves; the polarization separator is positioned below the plane secondary reflecting surface; the plane with the polarization separator and the horizontal plane form a certain included angle, and the range of the included angle is 30-60 DEG; and the polarization separator is used for separating the signals which are reflected by the primary reflecting surface into two paths of refraction and reflection signals which respectively enter the two millimeter wave receivers to be processed.

The invention discloses a feed-forward type satellite television antenna, which comprises a metamaterial panel. The metamaterial panel consists of a core layer and a reflector, the core layer comprises a core layer slice layer, the core layer slice layer comprises a circular area and a plurality of annular areas distributed on the periphery of the circular area, refractive indexes of positions, with identical radiuses, of the circular area and the annular layers are identical, the refractive index in the area of each of the circular area and the annular areas is gradually reduced along with increase of the radius, the minimum refractive index of the circular area is smaller than the maximum refractive indexes of adjacent annular areas, and within each two adjacent annular areas, the minimum refractive index of the inner-side annular area is smaller than the maximum refractive index of the outer-side annular area. The flaky metamaterial panel of the feed-forward type satellite television antenna replaces a traditional parabolic antenna, and accordingly the feed-forward type satellite television antenna is easy in manufacture and processing and low in cost. In addition, the invention provides a satellite television receiving system comprising the feed-forward type satellite television antenna.

The invention relates to a system with wide geographical coverage for monitoring positions in real time, comprising position monitoring terminals, a communication satellite and a position monitoring central station, wherein the position monitoring terminals comprise a GNSS (global navigation satellite system) positioning module, a satellite communication module, a control module and a power supply module respectively; the communication satellite is a synchronous orbit communication satellite; the position monitoring central station comprises a heavy caliber parabolic antenna, a satellite communication receiver and a data processing computer; and the position monitoring terminals are used for passing positioning information acquired by the positioning modules back to the monitoring central station by a satellite link, so that the central station can monitor the positions of the position monitoring terminals in real time. In the monitoring system, bandwidth resources of one satellite transponder are utilized, and an FDMA (frequency division multiple access) way, a CDMA (code division multiple access) way and a TDMA (time division multiple access) way are adopted to monitor the positions of the multiple position monitoring terminals in real time. The system is applied to regions with satellite signal coverage only without ground communication network coverage particularly. The system has the characteristics of instantaneity, multiple users and wide geographical coverage.