59 results about "Cassegrain antenna" patented technology

The invention involves a novel mechanical assembly incorporating, in a preferred embodiment, a technically advanced Cassegrain antenna design. The antenna achieves, in experiments, near theoretical performance with the minimum size. The Cassegrain antenna incorporates an intergrated DR array feed.

The invention relates to a terahertz beam two-dimensional mechanical scanning antenna feed system, and belongs to the technical field of antennas. The system comprises a biasing cassegrain antenna, a feed source antenna, a servo control system, a main reflecting surface support, an auxiliary reflecting surface support, a flange plate and an indication pin, wherein the biasing cassegrain antenna comprises a main reflecting surface and an auxiliary reflecting surface, the servo control system comprises an orientation and pitching two-dimensional rotary table, a servo controller and a rotary table base, and the orientation and pitching two-dimensional rotary table comprises an orientation control module, a pitching rotating motor and a pitching angle encoder. The system operates within a frequency band of 110 GHz-600 GHz, characteristics of the voltage standing wave ratio are good, gain is high, and a beam scanning mode is within the range of horizontal and pitching + / - 20 degrees; self-defining scanning traces can be achieved, and beams are accurately positioned. The system serves as an indispensable part of a terahertz imager, can be matched with the terahertz imager to set up a terahertz imaging system and makes important contributions to the public security field.

The invention relates to a dual-band wave beam equalization side-fed offset cassegrain antenna and a realization method thereof. The antenna comprises four pairs of standard side-fed offset cassegrain antennas and each pair of antenna comprises a primary reflector, a secondary reflector and a feed source assembly, wherein the four pairs of the standard side-fed offset cassegrain antennas are in a standard form and are used for receiving and transmitting; each feed source assembly is formed by a plurality of sample strip forming light wall loudspeaker feed sources; each sample strip forming light wall loudspeaker feed source is formed by sequentially connecting a sample strip forming light wall loudspeaker, a square and circle transition, a circular polarizer, a square and square transition and an orthogonal mould coupler; a main lobe of a low-frequency emission directional diagram and a first lateral lobe of a high-frequency receiving directional diagram irradiate the reflectors; and a phase center of each feed source assembly is located on focus planes of the reflectors and points at the center of an equivalent reflection face. According to the dual-band wave beam equalization side-fed offset cassegrain antenna and the realization method thereof disclosed by the invention, an antenna receiving-transmitting directional diagram has the equal beam width; and the dual-band wave beam equalization side-fed offset cassegrain antenna has the advantages of simple structure, portability, easiness for designing, good performance, strong practical applicability and the like, and has the good same frequency interference resistance.

The invention provides a box-shaped fan-beam antenna. The box-shaped fan-bean antenna comprises a feed horn, a main cylindrical reflector, an auxiliary cylindrical reflector, an upper cover plate, a lower cover plate, a left baffle and a right baffle. The Cassegrain antenna geometric form is adopted in a bus of the main cylindrical reflector and a bus of the auxiliary cylindrical reflector, the upper side of the main cylindrical reflector, the lower side of the main cylindrical reflector, the left side of the main cylindrical reflector, the right side of the main cylindrical reflector, the upper side of the auxiliary cylindrical reflector, the lower side of the auxiliary cylindrical reflector, the left side of the auxiliary cylindrical reflector and the right side of the auxiliary cylindrical reflector form a box-shaped cavity through the upper cover plate, the lower cover plate, the left baffle and the right baffle respectively, the horn conducting feed on the box-shaped cavity is hidden inside the box-shaped cavity and a waveguide port in the rear portion of the horn serves as a feed port. The box-shaped fan-beam antenna can provide fan beams with a wide pitch (azimuth) range and a narrow azimuth (pitch) range, and is simple in structural form, easy to process and manufacture and very suitable for being applied to millimeter-wave and over-submillimeter-wave frequency bands.

The invention discloses an optical-mechanical scanning antenna device used for scanning imaging. The optical-mechanical scanning antenna device used for scanning imaging comprises a main reflecting surface (6), a feed source (5), an auxiliary reflecting surface (7), a spinning motor (3) and a detector, wherein a certain angle is formed between the central axis of the auxiliary reflecting surface (7) and the central axis of the main reflecting surface (6). According to the optical-mechanical scanning antenna device used for scanning imaging, due to the fact that the auxiliary reflecting surface of a Cassegrain antenna is inclined by a certain angle, antenna wave beams deviate from the central axis of the main reflecting surface by a certain angle; due to the fact that the inclined auxiliary reflecting surface spins around the central axis of the main reflecting surface of the antenna, circular scanning is achieved through spinning of the antenna wave beams which deviate from the central axis of the main reflecting surface by the certain angle.

The invention discloses a W-waveband passive millimeter-wave imaging system for security check and belongs to the technical field of security check. The W-waveband passive millimeter-wave imaging system for security check comprises a W-waveband millimeter-wave radiometer, a Cassegrain antenna, a smooth metal reflecting surface, a horizontal rotary table, a longitudinal rotary table, a signal collection unit, a computer and a PLC (programmable logic controller) control unit, wherein the smooth metal reflecting surface is fixed on the longitudinal rotary table at a 45-degree angle, the longitudinal rotary table and the Cassegrain antenna are fixed on the horizontal rotary table coaxially, a feed source of the Cassegrain antenna is connected with the millimeter-wave radiometer through a waveguide, the millimeter-wave radiometer is connected with the signal collection unit, and the signal collection unit is connected with the computer. The W-waveband passive millimeter-wave imaging system for security check has the advantages of simple structure, low cost, small size, low power consumption, high stability, high imaging speed and capability of detecting hidden dangerous articles from a human body effectively.

The invention discloses a passive millimeter wave dual-channel synchronous imaging system for security inspection and an imaging method thereof, and belongs to the technical fields of millimeter waveimaging, security inspection and the like. The passive millimeter wave dual-channel synchronous imaging system comprises a smooth metal reflecting plane, a Cassegrain antenna, a radiometer, a longitudinal rotary plate, an optical fiber sensor, a horizontal rotary plate, a sensor retaining piece, a proximity switch, a data acquisition unit, a computer and a scanning control unit, wherein the smoothmetal reflecting plane is fixed on the longitudinal rotary plate at an angle of 45 degrees, the longitudinal rotary plate and the Cassegrain antenna are coaxially fixed on the horizontal rotary plate, a feed source of the Cassegrain antenna is connected with the radiometer, the radiometer is connected with the data acquisition unit, and the data acquisition unit is connected with the computer. The imaging system has the advantages of simple structure, low cost, small size, low power consumption, high stability and high imaging speed, can effective detect dangerous articles hidden on a human body, and can simultaneously perform security inspection imaging on inspected people in security inspection channels at the left and right of a scanning platform, thereby greatly improving the securityinspection efficiency.

A large-aperture offset feed Cassegrain deployment antenna comprises a main reflective surface assembly and a sub-reflective surface assembly, wherein the main reflective surface assembly is a 5-meter-diameter rotating paraboloid, which is divided into a fixed surface, a first expanded surface and a second expanded surface, and is respectively installed on a corresponding fixed surface back frame,a first expanded surface back frame and a second expanded surface back frame through an adjusting device; A sub-reflecting surface combination comprise a first sub-reflecting part and a second sub-reflecting part, which are respectively mounted on that sub-anti-unfolding arm by an adjusting device; The first pair is a 1-meter hyperboloid and the second pair is a 1.4-meter plane. The invention canrealize the ground folding of the large-caliber offset-fed Cassegrain antenna to meet the requirements of the carrier envelope, realize deployment and position maintenance on the orbit, and finally form an antenna system to realize the requirements of remote sensing and signal transmission functions on the orbit.

The invention provides a design method of a W-wave band single-pulse Cassegrain antenna. The design method comprises the following steps of: 1, determining diameter of a main reflecting surface of a Cassegrain antenna according to the demand of a target detection device on gain and caliber of the detection device; 2, determining a focal diameter ratio of the main reflecting surface of the Cassegrain antenna according to demands of the target detection device on the overall volume of the antenna and system noise; 3, determining the diameter and equation of a secondary reflecting surface of the Cassegrain antenna according to the demands of the target detection device on the side lobe of the antenna and 3bB wave beam width; 4, determining elongation and trumpet angle of a trumpet body at the front end of a feed source according to a single-pulse detection system and the secondary reflecting surface of the Cassegrain antenna; 5, determining a turning waveguide body at the rear end of the feed source of the Cassegrain antenna according to the demands of the target detection device on the feed source thickness and the rear end structure design; 6, designing a sum-difference network according to the single-pulse system and the feed source, and 7, assembling and forming the single-pulse Cassegrain antenna, and finally finishing design of the W-wave band single-pulse Cassegrain antenna.

The invention belongs to the technical field of antenna reflection and particularly relates to a frequency selection spectroscope. A hyperbolic frequency selection surface spectroscope comprises a medium substrate (1) and metal patches (2) arranged on the upper surface of the medium substrate (1) and is characterized in that the medium substrate (1) is made from a light-transmitting material, has the dielectric constant of 3.78 and is shaped like a hyperboloid of revolution; the metal patches (2) adopt crossed structures, are arranged in positions where the metal patches(2) are parallel to a tangent plane at the central point of the medium substrate (1), and are projected downwards to obtain the positions and shapes of the metal patches (2) on the medium substrate (1). The auxiliary reflecting surface of the hyperbolic frequency selection surface spectroscope is used for a millimeter-wave / infrared composite Cassegrain antenna, and can ensure favorable millimeter-wave band radiation characteristics and passive acceptance of infrared frequency bands at the same time so as to achieve the effect that antennas of two patterns share one antenna aperture to work simultaneously.

A mechanically scanned reflector antenna system that produces a compact swept diameter and overall height, which is ideally suited for use on the external surface of a high speed mobile platform where a low profile, lightweight antenna is needed. The antenna system includes a main reflector and a subreflector both formed from composite materials. A support assembly includes a pair of arms that cantilever the main reflector forwardly of a base portion of the support assembly such that a portion of the main reflector can be positioned below an upper surface of the base portion. This enables the vertical height of the swept arc of the main reflector to be reduced when the main reflector is rotated about its elevation axis. The assembly provides an even more compact system that can be enclosed within a smaller radome when the system is employed on an external surface of a high speed mobile platform.

The invention relates to an accurate calculation method for primary surface accuracy and primary and secondary surface adjustment of a shaped Cassegrain antenna, and belongs to the technical field of antennas. The accurate calculation method can be used for accurately calculating the primary surface accuracy of the shaped Cassegrain antenna, can accurately guide adjustment of secondary surface positions and gestures and active adjustment of a primary reflecting surface panel and is particularly applicable to the field of the antennas of large radio telescopes. The idea of the accurate calculation method includes that under the condition of aplanatism, an optimal identical reflecting surface is calculated through respectively adoption of translation along directions of an x-axis, a y-axis and a z-axis, rotation around an x1-axis and a y2-axis, and least square fit of six degrees of freedom of optical distance variation, so that the primary surface accuracy of the shaped Cassegrain antenna can be calculated. Meanwhile, calculated results of the accurate calculation method can guide the adjustment of the secondary surface positions and gestures and the active adjustment of the primary reflecting surface panel, so that influences of primary reflecting surface deformation on antenna performance can be reduced, and antenna efficiency is improved.

The invention provides a three-reflector compact field antenna measuring system. The three-reflector compact field antenna measuring system comprises a feed source, a primary reflector, a first shaping secondary reflector and a second shaping secondary reflector, wherein electromagnetic waves sent by the feed source are reflected to the second shaping secondary reflector through the first shaping secondary reflector, the electromagnetic waves are reflected to the primary reflector through the second shaping secondary reflector, the electromagnetic waves reflected by the primary reflector outgo as plane electromagnetic waves, and a system outgoing field is generated; the first shaping secondary reflector and the second shaping secondary reflector form a Cassegrain antenna structure, and the second shaping secondary reflector and the primary reflector form a Gregory antenna structure. According to the three-reflector compact field antenna measuring system, the Cassegrain-Gregory three-reflector structure is adopted to design the compact field antenna measuring system, a high primary reflector caliber using rate can be achieved, good silent area performance is kept, and manufacturing cost is lowered.

The invention discloses a metasurface-based cassegrain antenna, and mainly aims to solve the problems that the existing cassegrain antenna is high in phase error, complex in structure, and long in focal length. The metasurface-based cassegrain antenna comprises a carrier (1), a main reflecting mirror (2), an auxiliary reflecting mirror (3), a feed source (4) and a supporting structure (5); the carrier adopts a convex structure; the main reflecting mirror is conformal with the carrier; each of the main reflecting mirror and the auxiliary reflecting mirror adopts a phase change metasurface structure established based on generalized Snell law, wherein the auxiliary reflecting mirror is located below the focal point of the main reflecting mirror and has a hyperbolic characteristic phase, and is used for dispersing the electromagnetic waves emitted by the feed source into spherical waves; the main reflecting mirror and the auxiliary reflecting mirror are connected through the supporting structure; and the virtual focal point of the auxiliary reflecting mirror coincides with the focal point of the main reflecting mirror, and the solid focal point coincides with the phase center of the feed source. By virtue of the metasurface-based cassegrain antenna, the focal length of the cassegrain antenna can be shortened, wave beam calibration can be realized; and meanwhile, the antenna phase compensation error is lowered, the structure is simple, and the antenna can be used for communication and radar.

Provided is a high gain Cassegrain antenna. The antenna includes a feed unit that radiates radio waves, a subreflector that faces a radiation surface of the feed unit and reflects the radiated radio waves, and a main reflector that has a plurality of hole scatterers of different depths facing the subreflector and reflecting again the radio waves reflected from the subreflector. Accordingly, it is possible to manufacture a high-gain broadband antenna at low costs.

The invention discloses a satellite-borne nadir and adjacent-edge integrated detection antenna feed system. The satellite-borne nadir and adjacent-edge integrated detection antenna feed system comprises an adjacent-edge detection antenna, a nadir detection antenna, a polarized separator and a quasi-optical feed network; the adjacent-edge detection antenna adopts a dual-biased cassegrain antenna, and comprises a first main paraboloid of opposite polarity, a secondary hyperboloid of opposite polarity and a plane fold-back mirror; the nadir detection antenna adopts a single-biased paraboloid antenna and comprises a second main paraboloid of opposite polarity, a plane fold-back mirror 1 and a plane fold-back mirror 2, wherein the plane fold-back mirror, the plane fold-back mirror 1 and the plane fold-back mirror 2 are used for changing wave beam propagation direction; the polarized separator is realized by adopting a polarized grid mesh and used for selecting a horizontally-polarized adjacent-edge detection signal and a perpendicularly-polarized nadir detection signal; and the quasi-optical feed network consists of multiple frequency selection surfaces, an ellipsoidal mirror, a hyperbolic mirror and a plane mirror, wherein the frequency selection surfaces are used for separating multi-channel signals, folding back and converging the channel signals through the plane mirror, the hyperbolic mirror and ellipsoidal mirror, and then feeding the signals to each feed source horn.

The invention discloses a frequency selection surface type curved surface dielectric and a cassegrain antenna system. The curved surface dielectric comprises a dielectric substrate; the upper surfaceof the dielectric substrate is a pot cover-shaped curved surface, while the lower surface adopts a shape which is cut towards the upper surface of the dielectric substrate on the basis of the same shape of the upper surface, so that the perpendicular distance from the upper surface to the lower surface of the dielectric substrate is gradually reduced from the outer edge to the center of the dielectric substrate; the upper surface of the dielectric substrate is attached with a metal layer of the set thickness; total reflection of energy at the required waveband is realized in the middle regionof the pot cover-shaped metal layer; and gap units of the same sizes are arranged on the metal layer of a peripheral region in an annular array form, so that transmission of the energy at the requiredwaveband is realized. The curved surface dielectric has the advantages as follows: by adjusting the thicknesses from the outer edge to the center of the dielectric substrate, changes of the dimensions of the gaps in the metal layer from the outer edge to the center is not needed even if the projection angle is changed, thereby greatly lowering the processing difficulty.

The invention discloses a dual-polarization transmission surface with terminating a filter circuit to control electrical characteristics and a design method of the dual-polarization transmission surface. The transmission surface comprises a dual-polarization receiving antenna array, the filter circuit and a transmitting antenna array, wherein the receiving antenna array is used for transmitting received electromagnetic wave signals to the filter circuit, the filter circuit is used for realizing regulation and control of amplitude, phase and frequency characteristics of a transmission surface,and the transmitting antenna array is connected with a filter circuit terminal. The invention provides a new concept of controlling the electrical characteristics of incident electromagnetic waves byusing a circuit, a single-band or multi-band transmission surface with filtering characteristics can be realized by reasonably designing the circuit, and a frequency selection surface with a reflection band and a transmission band can be obtained; the dichroic mirror can be used as a secondary reflector of the Cassegrain antenna.

The invention provides a metasurface-based transmissive Cassegrain antenna for solving the technical problem that effective radiation of electromagnetic waves is hindered due to the fact that a secondary reflector of a reflective Cassegrain antenna shields a main reflector in the prior art. The metasurface-based transmissive Cassegrain antenna comprises a parallel planar waveguide, a secondary reflector, a main transmitting mirror and a feed source, wherein the secondary reflector, the main transmitting mirror and the feed source are located between two metal plates of the parallel planar waveguide; multiple uniformly arranged annular metal patches are printed on one side surface of the secondary reflector and a metal bottom plate is printed on the other side surface; the main transmittingmirror is of a multilayer dielectric layer structure; multiple uniformly arranged annular gaps are etched at the front sides of an odd number of dielectric layers; multiple uniformly arranged metal strips are printed at the front sides of an even number of dielectric layers; multiple uniformly arranged annular gaps are etched at the back side of the last dielectric layer; a rectangular horn antenna structure is adopted by the feed source; and a phase jump metasurface structure constructed on the basis of a generalized Snell's theorem is adopted by the main transmitting mirror and the secondary reflector.

The invention relates to a multimode substrate integrated waveguide monopulse antenna which can be directly applied to microwave and millimeter wave tracking systems, detection systems, communicationsystems, measurement systems, astronomy observing systems and the like and can serve as a feed source of a parabolic reflector antenna and a cassegrain antenna. An upper layer metal copper-clad surface (1) and a lower layer metal copper-clad surface (2) of the antenna are respectively arranged on the front side and the reverse side of a medium substrate (3); a plated-though-hole (4) is connected with the upper layer metal copper-clad surface (1) and the lower layer metal copper-clad surface (2) after passing through the medium substrate (3) to form a substrate integrated waveguide 3dB directional coupler (5), a substrate integrated waveguide 90-degree phase shifter (6), a substrate integrated waveguide wave mode device (7) and a master wave guide (8) which are arranged in sequence, i.e. the output end of the former component is connected with the input end of the latter component; the substrate integrated waveguide 3dB directional coupler (5) is respectively connected with a first input port (101) and a second input port (102), and the output end of the main wave guide (8) is connected with the input end of a horn antenna (9).

The invention relates to a dual-band wave beam equalization side-fed offset cassegrain antenna and a realization method thereof. The antenna comprises four pairs of standard side-fed offset cassegrain antennas and each pair of antenna comprises a primary reflector, a secondary reflector and a feed source assembly, wherein the four pairs of the standard side-fed offset cassegrain antennas are in a standard form and are used for receiving and transmitting; each feed source assembly is formed by a plurality of sample strip forming light wall loudspeaker feed sources; each sample strip forming light wall loudspeaker feed source is formed by sequentially connecting a sample strip forming light wall loudspeaker, a square and circle transition, a circular polarizer, a square and square transition and an orthogonal mould coupler; a main lobe of a low-frequency emission directional diagram and a first lateral lobe of a high-frequency receiving directional diagram irradiate the reflectors; and a phase center of each feed source assembly is located on focus planes of the reflectors and points at the center of an equivalent reflection face. According to the dual-band wave beam equalization side-fed offset cassegrain antenna and the realization method thereof disclosed by the invention, an antenna receiving-transmitting directional diagram has the equal beam width; and the dual-band wave beam equalization side-fed offset cassegrain antenna has the advantages of simple structure, portability, easiness for designing, good performance, strong practical applicability and the like, and has the good same frequency interference resistance.

The invention provides a Cassegrain antenna based on a super surface, and aims to reduce the phase compensation error of the antenna and simplify the antenna structure at the same time. The Cassegrainantenna comprises a slab waveguide, a main reflector, an auxiliary reflector and a feed source, wherein the main reflector, the auxiliary reflector and the feed source are clamped between two metal plates of the slab waveguide, both the main reflector and the auxiliary reflector adopt a phase sudden change super surface structure constructed based on a generalized Snell's law, the size of a metalring microstructure on a phase control layer of the main reflector is decided by the electromagnetic wave incident angle and the scattering parameter phase at the location so as to realize an electromagnetic wave phase compensation characteristic similar to that of a paraboloid, the size of a metal ring microstructure on a phase control layer on the auxiliary reflector is decided by the electromagnetic wave incident angle and the scattering parameter phase at the location so as to realize an electromagnetic wave phase compensation characteristic similar to that of a hyperboloid; and the feedsource is located at the midpoint of the main reflector which is opposite to the phase control layer of the auxiliary reflector, a virtual focus of the auxiliary reflector is overlapped with a focus of the main reflector, and a real focus of the auxiliary reflector is overlapped with a phase center of the feed source.

The invention discloses a design method of an elliptical beam Cassegrain antenna, and belongs to the technical field of satellite communication antenna design. The method comprises the steps of parameterization of a mouth surface field function and a transition function; forming population individuals by using the parameters of the mouth-surface field function and the transition function, and performing population iteration based on a DEGL algorithm; and shaping the antenna by using the optimal individual in the last generation of population to obtain the optimal design of the elliptical beamCassegrain antenna. The method provided by the invention can quickly optimize and design the high-efficiency, low-sidelobe, low-cross-polarization and large-axial-ratio elliptical beam antenna, and isan important improvement on the existing antenna design method.

The invention discloses an optical antenna of a free space optical communication system, and an automatic alignment method thereof, and belongs to the field of optical communication technology. The optical antenna comprises an antenna transmission head shell arranged at the top of a telescopic rod in a manner of being rotated for 360 degrees, and the telescopic rod is connected to the surface of the base via a rotating shaft that can rotate around the surface of the base, wherein a stray light aperture, a collimator, a Cassegrain antenna with an open secondary mirror, a pre-collimating deviceand a laser transmitting and receiving device are arranged on one side in the antenna transmission head shell away from the telescopic rod in sequence; the laser transmitting and receiving device comprises a semiconductor laser emission laser and a receiver; and the collimator comprises three detectors in central symmetry, and laser intensity sensors are arranged in the detectors. The laser beamsof the optical antenna are primarily aligned by using coordinate transformation of space to right angle, with the three vertexes of an equilateral triangle formed in the detector as foundation, accurate alignment is achieved by one-by-one alignment method, and the optical antenna can be applied to waveforms subjected to any deformation and information loss.

The invention belongs to the technical field of invisible antennas, and particularly relates to an invisible circularly-polarized planar folding Cassegrain antenna and a design method thereof. The antenna is composed of a focusing metasurface serving as a main reflection face, a rotation direction selection metamaterial serving as an auxiliary reflection face and a circular polarization horn feed source. The focusing metasurface is composed of a plurality of metasurface units, and each focusing metasurface unit is composed of two layers of square metal patches and a bottom layer metal backboard. The rotation direction selection metamaterial is composed of two kinds of square super units arranged in a chessboard mode. The two kinds of square super units are formed by periodically repeating r*r meta-material units in the x direction and the y direction respectively; each metamaterial unit is formed by vertically stacking two same dielectric blocks with clockwise spiral winding metal strips; the antenna can directionally radiate high-gain right-handed circularly polarized plane waves under the excitation of a left-handed circularly polarized horn feed source; and the antenna has the advantages of high gain, low RCS, low profile and the like, and has an excellent stealth function.

The invention relates to a Cassegrain antenna. The Cassegrain antenna comprises a feed source antenna (11), a main reflecting surface (13), an auxiliary reflecting surface and a main and auxiliary reflecting surface fixing device (14); the feed source antenna (11) is a conical horn in a horn antenna; the main reflecting surface (13) is in a paraboloid form; the auxiliary surface is replaced by a frequency selective surface (15); the frequency selective surface can generate resonance at the frequency points of 8 GHz to 14.5 GHz and 29 GHz to 34 GHz; electromagnetic waves can be transmitted at the frequency points, so that a wide radiation pattern can be generated; electromagnetic waves are reflected at other frequency points, so that a narrow radiation pattern can be generated; the performance of a Satcom-on-the-move system is greatly improved; the antenna works in a double-frequency mode; the working frequency bands of the antenna are 8-14.5 GHz and 29-34 GHz respectively; and in the two working frequency bands, the radiation patterns of the antenna comprise a narrow-wave beam radiation pattern and a wide-wave beam radiation pattern. The antenna can be well applied to the Satcom-on-the-move antenna system.

The present invention discloses a circularly polarized single-pulse Cassegrain antenna. The circularly polarized single-pulse Cassegrain antenna comprises a main reflection surface and an auxiliary reflection surface which are arranged coaxially, an assembly device connecting the main reflection surface and the auxiliary reflection surface, a feed source and a feed network. The feed source is an integrally formed circularly polarized single pulse feed source, the circularly polarized single pulse feed source comprises four same-structure circularly polarized feed units arranged in 2x2, and feed ports of the four circularly polarized feed units are all connected with the feed network. According to the circularly polarized single-pulse Cassegrain antenna provided by the present invention, the feed source is an integrally formed circularly polarized single pulse feed source, so that without stratified block-by-block processing, the feed source is applicable to various frequency bands, hasa simple structure, and has the characteristics of the bandwidth and the axial ratio; and in addition, the size of the feed source can be made small, the circularly polarized feed units can be smaller than one wavelength, and compared with the prior art, the feed source has the characteristics of miniaturization, can be used for various antennas, and has strong adaptability.

The invention discloses a Cassegrain monopulse antenna based on a planar array structure, which belongs to the technical field of antennas. The antenna comprises a feed source, a main reflecting surface, an auxiliary reflecting surface, a supporting structure and a sum-difference network. A main reflecting surface of the antenna is a groove-shaped main reflecting surface formed by a plurality of array surfaces, each array surface is formed by a passive unit array, and the shape of each unit is two square rings which are concentrically arranged. The required phase distribution can be realized by adjusting the size parameters of each unit on the array plane, and the design freedom degree and flexibility are improved. The Cassegrain monopulse antenna has the advantages of being high in gain, small in size, easy to machine and the like. Meanwhile, compared with a Cassegrain antenna with a main reflecting surface formed by a single array surface, the aperture efficiency of the antenna is improved.