255 results about "Horn antenna" patented technology

The invention belongs to the technical field of antennas, and particularly discloses an ultra-wide-band low-profile conformal double-ridge horn antenna which comprises a plurality of antenna radiation units which are arranged in a surrounding mode in the circumferential direction of an aircraft platform and can be installed with the aircraft platform in a conformal mode, and each antenna radiation unit comprises a double-ridge assembly and a feed assembly. Wherein the double-ridge assembly comprises a first ridge unit and a second ridge unit which are symmetrically arranged left and right, the opposite inner side surfaces of the first ridge unit and the second ridge unit are of curved surface structures, and the first ridge unit and the second ridge unit jointly form a horn section at the top and a waveguide section at the bottom; and the feed assembly is arranged on the waveguide section and is used for feeding to the first ridge unit and the second ridge unit. According to the horn antenna, through the structural design, the overall structure of the antenna is relatively compact, the size is relatively small, the height and the profile size of the antenna radiation unit can be reduced through the double-ridge curved surface structural design, and meanwhile the excellent frequency band width is achieved.

The invention provides a microwave superheterodyne frequency sweep measurement system based on Rydberg atoms, and belongs to the technical field of microwave frequency measurement. The laser module excites detection light of 780 nm and coupling light of 480 nm, and the two beams of light are reversely input into the atomic gas chamber through the dichroscope; signal microwaves are generated by a radio frequency signal source and are radiated to the position of the atomic gas chamber through the horn antenna; local oscillation microwaves are generated by the microwave module and are also radiated to the position of the atomic gas chamber through the horn antenna; the atomic gas chamber serves as a mixer to form a difference frequency signal; the spectrum analyzer is used for monitoring low-frequency difference frequency signals generated in the frequency mixing process in real time and recording signal intensity in real time. According to the invention, high-precision and wide-band microwave frequency measurement is realized, continuous and smooth frequency sweeping response can be provided in a frequency range, and absolute frequency detection of microwave signals is realized under the condition that a complex frequency comb technology is not introduced. The hardware architecture is simplified, the automation degree is improved, and integration, popularization and application are facilitated.

The invention discloses a near-field focusing microwave thermal therapy device and method based on a Huygens metasurface. The device comprises a feed source antenna, a Huygens metasurface array and a biological tissue model. The feed source antenna is a 5.8 GHz double-ridge horn antenna and is used for transmitting x-polarized electromagnetic waves; the Huygens metasurface array is formed by periodically arranging double-layer through-hole-free Huygens units, anti-symmetric E-shaped metal patterns are symmetrically arranged on the upper surface and the lower surface of the single-layer PCB substrate, and phase regulation and efficient transmission are achieved by adjusting unit structure parameters; the biological tissue model is of a two-layer structure attached to the Huygens metasurface array, electromagnetic waves emitted by the feed source antenna are subjected to phase compensation regulation and control through the Huygens metasurface array, and then near-field focusing is achieved on the surface layer of the biological tissue, so that the electric field intensity, the SAR value and the temperature of a target area reach design threshold values respectively, and the target area is obtained. And local precise heating of electromagnetic resonance and phase regulation is formed. According to the invention, an efficient, stable and easy-to-implement technology is provided for local precise heating in microwave hyperthermia.

The utility model relates to a broadband wide-beam horn antenna, which comprises an antenna main body, a feed port, a feed probe, a polarizer, a waveguide and a beam widening structure, the antenna body is in a cuboid shape with an opening in the upper middle end inside, through holes are formed in the left side face and the right side face of the antenna body, feed ports are connected to the through holes, feed probes are arranged in the feed ports, a polarizer is vertically connected to the bottom face inside the antenna body, and the polarizer is located between the two feed probes. The open end of the antenna main body is connected with a waveguide, and the inner diameter of the waveguide is gradually increased along the direction close to the antenna main body to form a horn shape with a big-end-down opening; the side surface of the waveguide is provided with a wave beam widening structure which extends outwards. The antenna with the structure has the advantages that the antenna with the structure can achieve the wide-beam antenna gain of 1.5 dB within + / -60 degrees and the wide-beam antenna gain of-0.5 dB within + / -70 degrees; and the working bandwidth can reach 10%. And the diameter is only 1.27 times of the wavelength of the lowest working frequency.

The invention discloses a multi-channel switching antenna based on a translation reconfigurable metasurface array, and relates to a multi-channel switching antenna design technology, in particular to a function of translation regulation and control of a beam deflection angle of a translation reconfigurable metasurface. And therefore, the functions of channel switching, dual-channel output and the like can be achieved. The multi-channel switching antenna comprises a translation reconfigurable metasurface array, a mechanical driving system, a feed circuit and a horn antenna array. The main process of the design method is that phase distribution of the translation reconfigurable metasurface is solved based on the generalized Snell law, the differential equation and the Rayleigh-Sommerfeld formula, then the metasurface unit structure and the translation reconfigurable metasurface which meet the requirements are designed through electromagnetic simulation software, arraying is conducted on the translation reconfigurable metasurface, and finally the translation reconfigurable metasurface is obtained. The multi-channel switching antenna based on the translation reconfigurable metasurface array is obtained, and the functions of channel switching, dual-channel output and the like can be achieved.

The invention belongs to the technical field of antennas, and particularly relates to a low-profile single-layer dual-polarization structure composite array antenna for a C / K wave band. Comprising a dielectric substrate, the lower surface of the dielectric substrate is a metal floor, and m * m composite array elements are integrated on the upper surface; each composite array element comprises a square ring structure and a Jerusalem cross structure arranged in the square ring structure, and the Jerusalem cross structure and the square ring structure are not in contact and coincide in center; all the square ring structures form a C-band array antenna, super units are divided according to n * n, and each super unit is fed through an SMA coaxial line; all the Jerusalem cross structures form a k-band reflective array antenna, super units are divided according to z * z, and each super unit is connected with a horn antenna through a waveguide for coupling radiation; wherein: nlt; zlt, zlt; m, z and n are positive numbers. According to the invention, multiplexing of a C / K wave band antenna structure is realized by using the single-layer dielectric substrate, the height is reduced, the process is simplified, the cost is reduced, the antenna is suitable for a multi-frequency satellite communication system, and large-scale array arrangement can provide high-gain radiation.

The invention belongs to the technical field of antennas, and discloses a reflection unit based on a metasurface and an array antenna thereof. Comprising a linear polarization horn antenna feed source and a metasurface reflection array. The array is composed of reflection units which are arranged periodically, and each reflection unit comprises a metal resonance layer, a dielectric substrate and a metal back plate from top to bottom. The metal resonance layer comprises a non-uniform line width structure formed by a central metal strip and two symmetrically connected arc-shaped metal arms, namely, the line width of the central metal strip is unequal to that of the arc-shaped metal arms, so that the loss of the reflection unit is effectively reduced, and coupling between amplitude and phase regulation is remarkably reduced. The reflection phase of the reflection unit is realized by adjusting the central angle corresponding to the arc-shaped arm, and the reflection amplitude is realized by adjusting the rotation angle of the whole metal resonance layer around the normal axis of the metal resonance layer. Through joint optimization of parameters and array arrangement of each unit, excellent performance of low sidelobe level, low cross polarization level and high aperture efficiency is finally realized.

The invention provides an automatic assembling platform for a radar liquid level meter shell, and belongs to the technical field of liquid level meter shell assembling. The platform comprises an assembling table, an air suction cylinder, a jacking table and a driving column. A plurality of sets of mounting grooves are formed in the assembling table in a penetrating mode, a plurality of sets of air exhaust channels and clamping cavities are formed in the assembling table, and a plurality of sets of air exhaust fixing holes are formed in each set of air exhaust channel in a communicating mode; the multiple sets of air exhaust channels rotate along with the assembly table to alternately and correspondingly communicate with the air exhaust groove. The jacking table is located below the assembling table and is configured to rotate relative to the jacking table; when rotating along with the assembly table, the driving column is driven by the jacking table to slide and lift in the clamping cavity, and the clamping plate is driven by lifting linkage of the driving column to slide in the mounting groove and used for clamping the horn antenna. According to the automatic assembling platform for the radar liquid level meter shell, the liquid level sensor can be doubly fixed, the liquid level sensor can be fixedly installed conveniently, and the assembled radar liquid level meter can be disassembled.

The utility model discloses a compact range measuring system, which relates to the technical field of compact range measurement and comprises a horn antenna, a compact range reflecting panel and an environment wave-transmitting box, the horn antenna is arranged below the compact range reflecting panel and can emit electromagnetic waves, the compact range reflecting panel is arranged outside the environment wave-transmitting box, and the environment wave-transmitting box is arranged outside the compact range reflecting panel. The compact range reflection panel can reflect electromagnetic waves, the box body of the environmental wave-transparent box can allow the electromagnetic waves to pass through, the internal space of the environmental wave-transparent box can accommodate a measured target, and environmental parameters of the internal space of the environmental wave-transparent box can be adjusted; according to the utility model, compact range measurement under different environmental conditions can be realized.

To provide a dielectric constant measuring method for reducing an analysis error of a dielectric constant in measurement by a free space method.SOLUTION: The method includes a step of preparing a first complex electric field distribution on an incident plane P1 of a dielectric sample 33, a step of preparing a second complex electric field distribution on an emission plane P2 of an electromagnetic wave transmitted from a receiving horn antenna and assumed to be incident on the dielectric sample 33 in a direction opposite to an emission direction of the electromagnetic wave, a step of calculating an angular spectrum distribution on a wave number space by inverse Fourier transformation of the first complex electric field distribution, a step of measuring a thickness of the dielectric sample 33 in a direction along an electromagnetic wave transmission direction, a step of calculating a reference of a complex electric field distribution which is a complex electric field distribution when the electromagnetic wave propagates in a free space by a distance corresponding to the thickness, and a step of obtaining a third complex electric field distribution of the electromagnetic wave propagating in the emission direction on the emission plane P2.SELECTED DRAWING: Figure 2

The embodiment of the invention provides a horn antenna, and relates to the field of antennas. The horn antenna comprises an antenna body, the antenna body is in a horn shape, the inner side radius and the axial position of the antenna body meet the function relation of index gradual change, and a plurality of annular tables are arranged on the outer periphery of the antenna body at intervals in the axial direction of the antenna body. The horn antenna provided by the invention has the excellent radiation performance of beam equalization, low side lobe, low cross polarization and the like of a traditional inner corrugated horn antenna, but is easier to process and implement at low cost, and can also avoid the problem of breakdown between inner corrugated walls of the traditional corrugated horn antenna during high-power microwave radiation, thereby improving the electromagnetic wave radiation capability.

A dual-polarized four-ridge horn antenna disclosed by the present invention comprises a horn section and a waveguide section, the horn section comprises a horn shell and four ridges which are located in the horn shell and have the same structure, the four ridges form a cross-shaped structure, two ridges located on the same straight line are a pair, two feeder lines are configured in the waveguide section, and the waveguide section is provided with two feed lines. The two feeder lines respectively excite the pair of ridges at the same time, so that dual polarization is realized. The two pairs of ridges are excited at the same time to realize two polarization directions at the same time, and low-frequency cut-off wavelength is effectively reduced and high-frequency cut-off wavelength is improved by means of smooth transition of the ridge waveguides, so that the bandwidth of the horn antenna is widened.

The utility model discloses a rapid error correction device for formation position keeping equipment. The rapid error correction device comprises positioning equipment and correction equipment, a prism in the positioning equipment is vertically arranged right below a direction finding antenna of the onboard formation position maintaining equipment, and a total station is placed at a position where the prism can be observed through a tripod; the positioning equipment measures the coordinates of the prism through the total station and positions the placement position of the horn antenna of the external field detector; and an external field detector in the correction equipment establishes connection with the onboard formation position keeping equipment through a horn antenna, measures an angle value and an energy value of a signal sent by the onboard equipment through the horn antenna, and transmits the angle value and the energy value to the airplane, so that error correction is implemented by the airplane. According to the technical scheme provided by the utility model, the problems that an airplane needs to be dragged twice and is accurately placed at a specific position, the time consumption is too long, the efficiency is low, manual errors are easily generated and the like in actual implementation in an existing mode for carrying out error calibration on the formation position keeping equipment are solved.

The invention discloses a horn antenna device with a reconfigurable wave beam and a using method thereof, and belongs to the technical field of antennae, and the horn antenna device comprises a wave same module which is relatively and fixedly arranged at the tail end of the horn antenna device; the three-axis telescopic framework is connected to the front end of the wave-same module, and the three-axis telescopic framework is at least composed of a transverse electric control telescopic component, a longitudinal electric control telescopic component and a depth direction electric control telescopic component and is used for changing the aperture and the depth size of the horn antenna; the distance feedback device is arranged at the oral surface position of the three-axis telescopic framework and is used for detecting in real time and feeding back the actual oral surface size to the control extension set; and the control extension set is electrically connected with the transverse electric control telescopic component, the longitudinal electric control telescopic component, the depth direction electric control telescopic component and the distance feedback device. The wave beam reconfigurable horn antenna device is simple and small in structure and high in structural strength, can expand various frequency bands and gains, and has high development and use potential.

The invention discloses a microwave electric field detection method based on three-light-excited Rydberg atom eight-wave mixing, and the method comprises the steps: building a microwave electric field detection device based on three-light-excited Rydberg atom eight-wave mixing, enabling a transmission path of decoration light Kd and a transmission path of coupling light Kc to reversely coincide with a transmission path of detection light KP in an atomic gas chamber, and enabling the transmission path of the coupling light Kc to be a transmission path of the detection light KP; a local oscillation microwave electric field KL is emitted to the atomic gas chamber from one side of the atomic gas chamber through the horn antenna; the horn antenna passively receives a signal microwave electric field KS in a free space and loads the signal microwave electric field KS to the atomic gas chamber; by observing the beat frequency electric signal output by the photoelectric detector, it is confirmed that the horn antenna receives the signal microwave electric field KS. Through a three-light excitation Rydberg atom scheme and an eight-wave mixing technology, the frequency resolution and sensitivity of electric field detection are remarkably improved, and a brand new technical path is provided for high-precision microwave electric field detection.

The application discloses a waveguide type Ka-band horn antenna, which comprises a straight waveguide section, a feeding section, a rear feeding cover and an antenna electric connector; the inside of the straight waveguide section is a rectangular waveguide cavity without a spine structure, and a local slot is formed in the matching surface of the feeding section; a feeding structure is designed in the inside of the feeding section, and the feeding structure is a multilayer step with a local protrusion on the matching surface of the straight waveguide section; the straight waveguide section and the feeding section are combined through fasteners, and the matching end surfaces of the straight waveguide section and the feeding section are both designed with blind hole positioning pin holes; the groove of the straight waveguide section is tightly matched with the protrusion structure of the feeding section; the rear feeding cover is locally protruded, and the protrusion structure is tightly matched with the cavity of the feeding section; the antenna electric connector is fixed through double holes, and the fastener passes through the through hole of the rear feeding cover and the antenna electric connector to simultaneously fix the two on the feeding section. The scheme provided by the application can effectively guarantee the design requirements of the antenna cavity, and has low overall manufacturing difficulty and good processability.

The application discloses an ultra-wideband circularly polarized wide-beam four-ridged horn antenna, which comprises four ridges arranged in a circle and a bottom-closed and top-open metal horn side wall, the ridges are connected with the upper surface of the bottom of the metal horn side wall, the lower surface of the bottom of the metal horn side wall is connected with a power division and phase shift network, the power division and phase shift network is connected with metal probes respectively arranged between two adjacent ridges of the four ridges, and the other two ridges are in contact with the cladding part of the metal probes; the working frequency band and the beam width are improved under the premise of small size by loading a stepped radiation structure on the upper part of the metal horn side wall, the beam width is regulated by adjusting the height and width of each layer of the stepped radiation structure, the beam width is further improved by introducing a circular slot on the metal horn side wall, and meanwhile, the metal probes which are bent by 90 degrees are arranged in the probe baffle, the side-feeding form of the four-ridged horn antenna is changed into bottom-feeding, and the occupation of the lateral space can be reduced without changing the original performance of the antenna.

The invention discloses a quasi-single-mode circular waveguide conical horn antenna, a radar and a communication device. The quasi-single-mode circular waveguide conical horn antenna comprises a circular waveguide section and a conical horn section. Conductor loss is reduced by remarkably increasing the diameter of the circular waveguide, and axial periodic annular grooves are formed in the inner wall of the circular waveguide to form a spatial mode filter and a selective attenuation high-order mode, so that high radiation efficiency and high mode purity are realized at the same time in a millimeter wave frequency band. And the conical horn section adopts an index profile to realize high-directionality radiation. The antenna structure effectively solves the technical problems of large loss and impure mode in a millimeter wave high-frequency band in the traditional design.

The utility model relates to the technical field of horn antennas, and provides a miniaturized double-ridge horn antenna, which comprises a rectangular frame, an antenna body is movably inserted into the inner side of the rectangular frame, a rectangular block is fixed at one end of the antenna body, the rectangular block is movably inserted into the inner side of the rectangular frame, and limiting grooves are symmetrically formed in the side walls of the rectangular block. Through holes are symmetrically formed in the outer wall of the rectangular frame, the through holes are communicated with the inner side of the rectangular frame, and movable plates are symmetrically arranged on the outer side of the rectangular frame. The antenna body is installed and fixed in the mode that the rectangular block is movably inserted into the inner side of the rectangular frame, the limiting rods on the side walls of the movable plates are movably inserted into the inner sides of the limiting grooves in the side walls of the rectangular frame to be fixed, and the trapezoidal plates can move to push the two movable plates to move towards the two sides by pushing the push-pull blocks. The antenna body dismounting device is easy to operate and convenient to dismount, and dismounting and maintenance work of the antenna body can be rapidly completed.

The low-profile broadband open horn antenna comprises a rectangular metal waveguide, the top and the bottom of the rectangular metal waveguide are each provided with a V-shaped air cavity which faces the wide side of a rectangle and is connected with an external free space, and a V-shaped opening which faces the wide side of the rectangle and is connected with the external free space is formed in each V-shaped air cavity; the metal wall of the V-shaped opening is removed; and the coaxial feeder line longitudinally penetrates through the rectangular metal waveguide, and the top of the coaxial feeder line is connected with metal between the end point of the V-shaped air cavity and the end point of the V-shaped opening. The cross polarization suppression degree of electromagnetic waves passing through the rectangular metal waveguide is high; meanwhile, the width of the V-shaped opening is continuously expanded along the propagation direction, electromagnetic waves propagated in the structure of the V-shaped opening are TE10 modes in the metal waveguide, and the electromagnetic waves in the modes have the characteristic of high gain during radiation, so that the antenna has the characteristic of high gain radiation.

The present invention discloses a vertically printed dual-polarized ultra-wideband horn antenna assembly and array, belonging to the field of antenna technology. The vertically printed dual-polarized ultra-wideband horn antenna assembly includes an antenna unit and a feed circuit. The antenna unit is a traditional horn antenna that is discretely distributed in a multi-layer medium through vertical printing technology. This technology is compatible with PCB, LTCC, and integrated circuit processes, facilitating the integration of the antenna and the feed structure. At the same time, the antenna array formed by the antenna unit can be freely arrayed according to the number of units and the arrangement method. In addition, active devices can be integrated to cope with various application scenarios. The vertically printed dual-polarized ultra-wideband horn antenna assembly and array provided by the present invention can have the characteristics of high system integration, low profile, ultra-wideband, etc.

The application discloses a high-gain dual-polarized wideband horn antenna and relates to the technical field of horn antennas for communication. The horn antenna comprises an antenna body, a radiation aperture extension cylinder is fixed at a horn opening of the antenna body, a first conical cavity is formed in an inner cavity of the antenna body, a second conical cavity is formed in an inner cavity of the radiation aperture extension cylinder, a right end opening of the first conical cavity is matched with a left end opening of the second conical cavity, and an opening angle of the first conical cavity is consistent with an opening angle of the second conical cavity. The horn antenna has high radiation efficiency and can realize wideband and high gain in the smallest size.

The invention provides a broadband feedback type dual-circularly-polarized horn antenna structure. The broadband feedback type dual-circularly-polarized horn antenna structure comprises a horn body; the feed converter comprises a feed cavity and a coaxial cable, a first end of a core wire of the coaxial cable is electrically connected with a first ridge body of the feed cavity, and a first end of a shell of the coaxial cable is electrically connected with a second ridge body of the feed cavity; the circular polarization generator comprises a cavity structure, a printed board, a cover plate, an inner conductor, a compression ring and a radio frequency connector, the printed board, the inner conductor and the compression ring are arranged in the cavity structure, and a probe and the inner conductor of the radio frequency connector are respectively welded with preset welding spots of the printed board; the horn body, the feed converter and the circular polarization generator are sequentially and coaxially stacked and fixed through fasteners, after fixation, a core wire of the coaxial cable is electrically connected with the inner conductor, a shell of the coaxial cable is electrically connected with the pressing ring, and the radio frequency connector achieves radio frequency connection externally. According to the invention, the horn and the bridge are integrated, the size and weight are reduced, the transmission loss is reduced, and the antenna radiation efficiency is improved.

The invention relates to a system and a method for measuring ballistic trajectories in a light-gas gun and an artillery, and the system comprises a first microwave source assembly, a first power amplifier, a first circulator, a horn antenna, a second microwave source assembly, a second power amplifier, a second circulator, a linear polarization antenna and a microwave reflection and transmission plate, the directions of microwaves emitted by the horn antenna and the linearly polarized antenna form an angle of 90 degrees, the microwave reflection and transmission plate is arranged on an angular bisector of the angle formed by the horn antenna and the linearly polarized antenna, and the microwave reflection and transmission plate enables short-wavelength microwaves emitted by the horn antenna to be directly transmitted to a target to be measured. And long-wavelength microwaves emitted by the linear polarization antenna can be reflected to a to-be-measured target according to an angle of 45 degrees. According to the system for measuring the ballistic trajectory in the light-gas gun and the artillery, long-wave microwaves are reflected on the front surface of forward gas, short waves are reflected on the surface of a projectile, and therefore long-distance, continuous and simultaneous measurement of the speed of the forward gas and the speed of the projectile is achieved.

The utility model discloses an easily detachable antenna fixing tool, including tool fixed end and antenna installation end. Tool fixed end is fixed in the top of elevating lever, contains bottom plate, side plate and installation panel, and the antenna installation end includes installation disc, extension column, fixed panel, waveguide coaxial adapter and gain horn antenna. The installation disc is fixed through the interference fit of adaptive hole and the adaptive column of installation panel, and the both ends of extension column are inserted into the first insertion hole of installation disc and the second insertion hole of fixed panel to realize detachable connection through interference fit, and the opening of fixed panel forms a channel with the limiting portion for the plug-in of waveguide coaxial adapter. The tool realizes quick disassembly and assembly through interference fit, the installation calibration hole guarantees accuracy, the structural design enhances stability, the opening design is convenient for maintenance, and effectively improves the disassembly and assembly efficiency and use reliability.

The present invention relates to a frequency steered phased array antenna which adjusts beam radiation angle according to frequency for broadband electromagnetic waves, and radiates beams of uniform intensity over a broad range of angles including directly forward. The frequency steered phased array antenna according to the present invention comprises: a directional coupler including a serial feed line that is stacked in n layers and has a plurality of coupling holes formed in one direction in each of the layers; and a radiating module including n horn antennas respectively connected in correspondence to the n layers of the serial feed line, wherein the plurality of coupling holes are formed in each of the layers of the serial feed line at intervals of ¼ of the wavelength (λ) of electromagnetic waves (radio waves) supplied to the serial feed line, and the horn antennas radiate the electromagnetic waves output through the coupling holes of the serial feed line.

This invention discloses a broadband two-dimensional scanning photonic terahertz high-speed communication device, comprising a photonic terahertz broadband signal transmitter, a terahertz Riesling prism antenna, and a terahertz Cramer-Kroni receiver. The photonic terahertz broadband signal transmitter includes a digital-to-analog converter (DAC), a first laser, an optoelectronic modulator, a first polarization-maintaining tunable optical attenuator, a polarization-maintaining optical amplifier, an optical coupler, a second laser, a second polarization-maintaining tunable optical attenuator, a photodetector, and a power amplifier. The terahertz Riesling prism antenna includes a horn antenna, a phase-calibrated linear gradient phase-shifting surface, and a linear gradient phase-shifting surface. The terahertz Cramer-Kroni receiver includes, in sequence, an attenuator, a low-noise amplifier, an intensity detector, an ADC sampling unit, a Cramer-Kroni processing unit, and a DSP processing unit. This invention has the advantages of flexible and adjustable beam, large bandwidth, simple system structure, and easy extension to higher frequencies.

The present invention relates to an array antenna for two-dimensional interferometric angle measurement of continuous wave radar, belonging to the field of antenna technology. It comprises a transmitting horn antenna, seven receiving horn antennas, a partition wall and an isolation bottom plate. A transmitting horn antenna and seven receiving horn antennas constitute the array surface of the array antenna, wherein the transmitting horn antenna is located at the upper right corner of the entire array surface, and the seven receiving horn antennas form an L shape and are located at the lower left corner of the entire array surface; the pitch and azimuth dimensions each include four receiving horn antennas, and the receiving horn antenna at the apex of the L shape is shared by the azimuth and pitch dimensions. The isolation wall and the isolation bottom plate can improve the isolation between the transmitting and receiving antennas, the transmitting horn antenna transmits electromagnetic wave signals, and the seven receiving horns are arranged at a certain interval to receive target echo signals, and the azimuth and pitch dimensions are measured by double baselines.

The present application relates to a horn antenna element (100), comprising: a septum polarizer (110) configured to transform a linearly polarized input signal (102) into a circularly polarized output signal (104) at a common port (112); and a horn radiator (120) comprising: an inlet geometry formed as a four-crest waveguide (121) for receiving the circularly polarized output signal (104) at the common port (112); and an aperture grid (124) for radiating a grid-based circularly polarized output signal (106), wherein the septum polarizer (110) is embedded in the four-crest waveguide (121) at the common port (112).

The low-profile ultra-wideband folding horn antenna comprises a dielectric lens, a horn antenna body and a metal back cavity which are sequentially arranged from top to bottom, the horn antenna body is arranged in the metal back cavity, and the metal back cavity wraps the bottom of the horn antenna body and at least two symmetrically-arranged side walls. According to the invention, the coaxial cable is adopted for direct feeding, and the multiple bent radiation arms are introduced, so that the profile height of the horn antenna is greatly reduced and the antenna structure is simplified; meanwhile, by loading the dielectric lens and the metal side wall, the gain in the working frequency band is remarkably improved, and the dielectric lens and the shielding cover are integrally formed, so that processing and mounting are facilitated. The antenna has the ultra-wideband characteristic, and the low-frequency gain performance is stable; the cross polarization level is lower than-34 dB, the radiation pattern is symmetrical and good in directivity, and the overall radiation performance is stable. The antenna is low in profile, simple in structure, small in size, low in manufacturing cost and capable of meeting the requirements of a 5G communication indoor distribution system.