132 results about "Vivaldi antenna" patented technology

The invention belongs to the technical field of communication, and particularly relates to an ultra-wideband miniaturized Vivaldi antenna. The antenna comprises a dielectric substrate, wherein the upper surface of the dielectric substrate comprises a main body Vivaldi antenna, four resistors, two rectangular metal patches and an artificial surface plasma, wherein the main body Vivaldi antenna is provided with an exponential gradually-changed slot; a feed network is arranged on the lower surface and comprises six impedance conversion microstrip transmission lines, a fan-shaped transmission line and a circular groove; the main body antenna and the dielectric substrate are placed in a centered alignment manner, the four resistors are placed at the tail end of the main body antenna, and the rear sides of the resistors are connected with the two rectangular patches; the artificial surface plasma is placed in the main body antenna gradual change gap; and the multi-section impedance transformer and the microstrip-to-slot line structure of the feed network are aligned with the circular slot of the main body antenna. According to the invention, the ultra wide band, miniaturization and high radiation gain are realized by designing the main body antenna, slotting the edge, loading the resistor, carrying out the artificial surface plasma and the like. The working frequency band of the antenna ranges from 0.2 GHz to 18 GHz, and the antenna has the characteristic of miniaturization.

The invention discloses an ultra-wideband dual-polarization all-metal array antenna based on heterogeneous conical units, the antenna array arrangement mode is a square grid form, and in order to reduce the influence of an edge truncation effect on an array, an array edge unit and a middle unit adopt two structures; the edge unit is a basic conical metal Vivaldi antenna; in the middle unit, four corners of the basic unit are cut to optimize impedance matching, and meanwhile, orthogonal metal partition plates are added to the bottom to improve the isolation degree between ports. Electromagnetic energy radiates outwards at the exponential gradual change groove formed by the adjacent units; the antenna array structure comprises a bottom plate, two kinds of radiation units and a commercial standard radio frequency connector. According to the antenna array provided by the invention, the active S parameter of each port in a designed frequency band is below-10dB, and the electrical performance requirement of broadband dual polarization is met. The antenna is integrally made of metal and is high in mechanical strength, convenient to maintain and replace and wide in bandwidth.

The invention discloses a photon antenna working at 275-296 GHz, and belongs to the field of photoelectron and terahertz communication. The UTC-PD comprises two UTC-PD bodies and a passive structure. The UTC-PD body adopts a double-mesa structure, each structure leads out an electrode by electroplating a small bonding pad, a metal bump is processed on the small bonding pad, and the UTC-PD body is electrically connected with a passive structure through flip-chip bonding. The passive structure comprises an impedance matching circuit, a power combiner circuit and a vivaldi antenna; the UTC-PD body generates a signal, and a built-in electric field is introduced by using the gradient doped absorption layer; a cliff layer is arranged between the absorbing layer and the collecting layer; and then, after the signal passes through an impedance matching circuit, the output impedance is close to 50 ohms, two combined output signals are superposed to the feed end of the Vivaldi antenna through a power combiner, and finally, the two combined output signals are converted into high-frequency electromagnetic waves with the frequency band of 275-296 GHz for radiation. Electromagnetic waves within the terahertz frequency range are generated and emitted, and the technical performance of high bandwidth, high gain and low insertion loss is achieved.

A broadband tight-coupling Vivaldi array antenna comprises N + 2 antenna sub-arrays arranged along an H plane, each antenna sub-array is formed by tightly arranging a plurality of tight-coupling Vivaldi antenna units along an E plane, each tight-coupling Vivaldi antenna unit comprises a dielectric substrate, a radiation patch and a metamaterial patch are printed on the upper surface of the dielectric substrate, a feed balun is printed on the lower surface of the dielectric substrate, and the feed balun is arranged on the upper surface of the dielectric substrate. A radio frequency coaxial connector is arranged at the bottom of the dielectric substrate, a needle-shaped inner conductor end of the radio frequency coaxial connector is connected with the feed balun, and a cylindrical outer conductor end of the radio frequency coaxial connector is in contact with the radiation patch; according to the invention, the miniaturization of the Vivaldi antenna array is realized by utilizing the coupling effect between the units, the edge current path is prolonged by introducing the edge piece and the dummy element at the edge of the array, the active standing-wave ratio of the Vivaldi antenna array during angle scanning is improved to a certain extent, and 60-degree beam scanning is realized on the E surface and the H surface; moreover, the antenna is simple in structure, simplifies the design process of the antenna, and is lower in machining difficulty and cost.

The invention relates to the technical field of unmanned aerial vehicle interference, and provides an unmanned aerial vehicle communication link countering system based on a Vivaldi antenna, an antenna array, and the system comprises a signal receiving unit and a signal transmitting unit. Wherein the antenna array is formed by fixing at least two groups of Vivaldi antenna units which are arranged in a staggered manner in the extensible mechanical frame; the broadband interference component is used for responding to the spectrum signal of the to-be-suppressed unmanned aerial vehicle through a receiving unit and generating a first interference signal; wherein the interference frequency band corresponding to the first interference signal is the same as the real-time communication frequency band of the to-be-suppressed unmanned aerial vehicle, and the extensible mechanical frame is used for responding to the first interference signal and determining the number and angle of the expanded area arrays.

The invention belongs to the technical field of antenna design, and provides a geological radar antipodal Vivaldi antenna for lining deep detection, which comprises a dielectric substrate, a metal radiation patch and a parasitic patch, the two metal radiation patches are etched on the upper surface and the lower surface of the dielectric substrate; the two metal radiation patches have the same structure and are respectively composed of a radiation part and a feed part; the feed part is etched with a microstrip line, and the microstrip line is connected with the radiation part in a gradual change index curve mode. The inner edge of the radiation part is an index gradual change slot line; the side edges of the two radiation parts are symmetrically engraved with concave semi-elliptical grooves; a plurality of parallel comb-shaped open grooves which are vertical to the side edge of the dielectric substrate are formed in the semi-elliptical groove; the tail ends of the comb-shaped open grooves are attached to the contour lines of the semi-elliptical grooves at different lengths. The method can improve the accuracy and reliability of tunnel lining deep layers.

The invention discloses a Terahertz broadband high-gain Vivaldi antenna based on a CPW (Coherent Plane Waveguide) rotary slot line structure, and belongs to the field of Terahertz communication. The antenna adopts an integrated single-layer metal structure on the top layer of a dielectric substrate, and is divided into a radiation arm and a CPW rotating slot line balun along the axial direction. The inner side edge of the radiation arm is a smooth exponential change curve, and the middle exponential gradual change groove forms a broadband traveling wave radiation channel. Periodic grid choke grooves are loaded on the outer side edge so as to suppress edge surface waves and improve a directional diagram. The feed part adopts a CPW to slot line balun structure to realize conversion from an unbalanced mode to a balanced mode, and a fan-shaped radial branch knot is utilized to form a broadband virtual short circuit boundary at a feed point to ensure unidirectional efficient transmission of energy. In addition, a group of string-shaped director patches are arranged in the opening area of the exponential gradual change groove along the central axis, and the wave beam is guided through phase correction. The terahertz planar antenna effectively solves the problems of limited bandwidth and insufficient gain of the terahertz planar antenna, and has the characteristics of compact structure, easiness in integration, excellent radiation performance and the like.

The invention relates to a multi-beam switching antenna applied to a wind finding radar and a working method of the multi-beam switching antenna. The antenna comprises a connecting device, a feed device and a lens device, the connecting device is a subminiature push-in connector, the input end of the connecting device is connected with the wind finding radar, and the output end of the connecting device is connected with the feed device; the feed device comprises a GCPW-SIW conversion structure and a feed source antenna. Wherein the feed source antennas are sixteen antipodal Vivaldi antennas and are used for radiating spherical waves to the lens device; the lens device is a metasurface lens, and the feed device and the lens device are arranged in an offset-focus mode. Therefore, phase compensation is carried out on spherical waves radiated by a feed device located at the focus of the lens, and the spherical waves are converted into plane waves of the emergent surface of the lens. Compared with the prior art, the method has the advantages that the actual application requirement of a wind measurement radar system is met, and accurate wind field measurement and data acquisition are achieved.

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

A dual-frequency dual-polarization shared aperture antenna with mode diversity belongs to the technical field of wireless communication and antennas, comprises a metal floor, Vivaldi antenna left and right ridge metal radiators, a conical monopole antenna, a dielectric polarization converter and two coaxial feed wires, and adopts a side coaxial line for feeding; wherein the metal radiator and the conical monopole radiator are of a composite integrated structure; the interior of the conical monopole radiator is hollow, and the two metal radiators are symmetrically arranged at the bottom of the conical monopole radiator. According to the antenna, dual-frequency dual polarization is achieved, microwave and millimeter wave frequency bands can be covered, the two frequency bands are mutually independent and wide, and the antenna has an omnidirectional radiation mode and a directional radiation mode at the same time; the dual-frequency dual-polarized antenna with multi-mode diversity has a good and stable omnidirectional radiation pattern in a microwave band, is in a circular polarization radiation mode in a millimeter wave band, has high-gain directional radiation capability, and can be applied to various applications such as UWB (Ultra Wideband), 5G millimeter wave communication and the like.

The invention discloses a micro coaxial ultra wide band Vivaldi antenna and a half mode Vivaldi antenna. The micro coaxial ultra wide band Vivaldi antenna comprises a coaxial feed structure, a fan-shaped feed source and a metal cavity, the coaxial feed structure comprises a coaxial inner core and a coaxial outer conductor, the coaxial inner core is suspended in the coaxial outer conductor, one end of the coaxial inner core is connected with the fan-shaped feed source through a coaxial matching section, and the other end of the coaxial inner core is a free end; the fan-shaped feed source is suspended in the metal cavity, a matching round hole is formed in the metal cavity on one side of the fan-shaped feed source, an exponential gradual change type curve opening is formed in the metal cavity, and the matching round hole is connected with the exponential gradual change type curve opening through an inclined linear gap; comb-shaped gaps are formed in the two sides of the metal cavity; the metal cavity is connected with the coaxial outer conductor; according to the Vivaldi antenna, the antenna loss is reduced through the coaxial structure, the antenna can work at high frequency, the Vivaldi antenna can realize wider impedance matching through the exponential gradual change type curve opening, the comb-shaped gap and the matching round hole, the bandwidth of the Vivaldi antenna is increased, and good gain is kept.

We disclose an ultrawide-band (UWB) dual polarization three-dimensional (3D) tapered aperture Vivaldi antenna. It is generally comprised of a radiator having two pairs of tapering arms, each pair corresponding to a different polarization and the tapering arms spaced thereof closest to one another at a feed point location of the antenna and taper outwardly in opposite directions, thus forming a 3D Vivaldi antenna aperture therebetween; and a dual feed balun connecting to each of the two pairs of tapering arms and providing a separate channel for each of the polarizations. Embodiments of our antenna have been designed and simulated using full-wave electromagnetics commercial software. The results for our antennas demonstrate over 20:1 operating bandwidth with good radiation characteristics and very low cross polarization.

The invention provides an ultra-wideband double-slot Vivaldi antenna for an air coupling radar. The ultra-wideband double-slot Vivaldi antenna comprises a dielectric substrate, a gradually-changed open slot, an elliptical open slot and a microstrip feed structure, a radiation patch is attached to the upper surface of the dielectric substrate; the gradually-changed open slot is formed in the radiation patch and has a trumpet-shaped opening; the plurality of elliptical open slots are formed in the radiation patch and are symmetrically arranged at two sides of the gradually-changed open slot, the elliptical open slots are all parts of the whole ellipse, and the centers of the plurality of elliptical open slots at the same side are gradually changed along the direction of the center line of the gradually-changed open slot; an included angle is formed between the long axis of the elliptical open slot and the center line of the gradually-changed open slot; the microstrip feed structure is arranged on the lower surface of the dielectric substrate. According to the Vivaldi antenna, the surface current distribution of the antenna is improved, the current backflow phenomenon is inhibited, the sidelobe energy is reduced, the energy is concentrated in the main radiation direction, and the gain and directivity of the antenna are greatly improved.

The invention relates to the technical field of antennas, and discloses a high-power microwave antipodal Vivaldi antenna and a parameter determination method, so as to improve the power capacity of the antipodal Vivaldi antenna and improve the radiation gain of the antenna. In the antenna disclosed by the invention, the left comb-shaped metal oscillator and the right comb-shaped metal oscillator which are consistent in thickness are based on an all-metal structure; two middle vertical planes of the two comb-shaped metal oscillators based on a line segment where the thickness direction is located are two parallel planes which are equally spaced from the center of the metal floor, the inner contour and the outer contour of the middle vertical plane corresponding to the left comb-shaped metal oscillator respectively comprise two sections of gradual change curves, and the gradual change curve section at the bottom is connected with the metal floor through a rectangular square block; the inner and outer contours of the middle vertical plane corresponding to the right comb-shaped metal oscillator are respectively and directly connected with the metal floor through a section of gradual change curve; a cuboid empty groove which is dug and parallel to the rectangular metal floor is formed between the upper comb teeth of the left comb-shaped metal oscillator and the upper comb teeth of the right comb-shaped metal oscillator, and the cross sections, parallel to the middle vertical plane, of the comb-shaped metal oscillators are consistent in shape.

The invention relates to the technical field of antennas, and discloses a gain-improved antenna for a high-power microwave system and a parameter determination method, so as to synchronously improve the power capacity and gain after selecting an anti-breakdown dielectric substrate with a high dielectric constant. The antenna comprises a gradient feed balun which is carried on the back surface of a dielectric substrate and is connected with an inner conductor probe of a coaxial line, wherein an outer conductor of the coaxial line is connected with a part, which is deployed on the front surface of the dielectric substrate, of a Vivaldi antenna; the dielectric constant of the dielectric substrate is greater than or equal to 10.2; wherein inclined rectangular grooves with the same size and shape are formed in the two sides of the part, located on the front face of the dielectric substrate, of the Vivaldi antenna, and a metasurface unit of a snowflake-like structure is printed in the middle of the upper portion between a left gradual change curve and a right gradual change curve, so that the power capacity in the target working frequency band of the S wave band and the C wave band is larger than 8 MW, and the radiation gain is obviously improved.

The invention discloses an ultra-wideband miniaturized vertical polarization horizontal omnidirectional radiation antenna, and belongs to the technical field of antenna engineering and wireless communication. The antenna comprises a vertical polarization radiator, a metal top cap, a parasitic metal column, a metal floor and a polarization surface, wherein the vertical polarization radiator is composed of four miniaturized Vivaldi antennas which are placed towards the end-fire direction; the metal top cap and the metal floor are respectively located above and below the radiator, the polarization surface surrounds the periphery of the radiator, and two ends of the parasitic metal column are respectively connected with the metal top cap and the metal floor. The miniature Vivaldi antenna is adopted to form the radiator, so that the problem of distortion of a high-frequency radiation pattern caused by the size of an ultra-wideband antenna is solved; a low-frequency magnetic dipole radiation mode is formed by using the parasitic metal columns, the metal top caps and the metal floor, and the low-frequency bandwidth is expanded. On the basis of miniaturization, the antenna provided by the invention can realize S11lt in 1-6GHz; and vertical polarization horizontal omnidirectional radiation of-10dB is realized, and the out-of-roundness of an omnidirectional radiation pattern is less than 3dB.

The invention discloses an ultra-wideband differential Vivaldi antenna with a reflection-free notch characteristic and a continuous gain test method of the ultra-wideband differential Vivaldi antenna. The Vivaldi antenna is composed of a differential feeder line and a metasurface on the top layer, a metal ground layer on the bottom layer and an intermediate dielectric substrate layer. A gradual change flaring groove line is etched on the metal ground layer of the bottom layer, and the gradual change flaring groove line is composed of a gradual change groove line with an exponential distribution characteristic and a tail end circular open-circuit groove line. Differential mode signals can excite a traveling wave slot mode through a broadband conversion structure formed by the differential feeder lines and the gradually-changed flaring slot lines, then resonance of the whole metasurface can be excited, and non-reflection notch absorption of electromagnetic waves of a target frequency band is achieved through inherent conductor and dielectric loss during resonance of the metasurface. The continuous gain test method overcomes the defect that a broadband balun needs to be additionally designed in a traditional differential antenna gain test, and has the advantages of being simple in test process, accurate in result and the like.

This invention discloses a microwave-millimeter-wave structured multiplexed antenna for vehicle communication, comprising a microwave half-mode Vivaldi antenna, a millimeter-wave vertically polarized oblique-fire phased array, and a millimeter-wave horizontally polarized oblique-fire phased array. The structured multiplexed antenna constructed by this invention embeds the vertically polarized and horizontally polarized millimeter-wave oblique-fire phased arrays into the inherent structure of the ultra-wideband microwave half-mode Vivaldi antenna, forming a seamlessly integrated high-frequency-ratio multi-band antenna. The vertically polarized and horizontally polarized millimeter-wave oblique-fire phased arrays have the characteristics of wide bandwidth, simple structure, and low profile, while the microwave Vivaldi antenna has the characteristics of ultra-wideband bandwidth and miniaturization. The vertically polarized millimeter-wave antenna and the horizontally polarized millimeter-wave antenna respectively utilize multi-mode resonance superposition and equiphase surface adjustment techniques to achieve a stable 45° oblique-fire beam across a wide operating frequency band without adding additional structures.

The invention discloses a log-periodic antenna and an ultra-wide-band dual-polarization low-profile conformal array antenna, and belongs to the technical field of design and manufacturing of ultra-wide-band antennas. The array element is formed by compounding and nesting two types of antennas including a miniaturized log-periodic antenna and a Vivaldi antenna, and the structure is multiplexed. According to the provided miniaturized log-periodic antenna, the broadband miniaturized conformal design is realized through composite loading methods such as array top loading, partial array bending, partial array loading dielectric blocks and the like. On the basis, the invention provides a design method for forming the dual-polarized antenna by nesting a Vivaldi antenna and a log-periodic antenna. A Vivaldi antenna is subjected to left and right block design, a radiation slot and an excitation slot are formed through splicing, and an assembly line of a log-periodic antenna is deployed on a left sector plate and a right sector plate of the Vivaldi antenna. According to the dual-polarization array forming mode, large-curvature conformality of the pitching surface is considered, and pitching surface wide-beam coverage and azimuth surface wide-angle scanning application can be achieved.

The present application relates to the technical field of unmanned aerial vehicle interference, and provides an unmanned aerial vehicle communication link countermeasure system based on a Vivaldi antenna, an antenna array including a signal receiving unit and a signal transmitting unit; wherein the antenna array is fixed in an expandable mechanical frame by at least two groups of staggered Vivaldi antenna units; a wideband interference component: for responding to the spectrum signal of the unmanned aerial vehicle to be suppressed through the receiving unit, and generating a first interference signal; wherein the interference frequency band corresponding to the first interference signal is the same as the real-time communication frequency band of the unmanned aerial vehicle to be suppressed, and the expandable mechanical frame is used for determining the number and angle of the unfolded surface array in response to the first interference signal.

The invention relates to a miniaturized Vivaldi antenna, in particular to an ultra-wideband miniaturized Vivaldi antenna. The invention aims to solve the problems that the miniaturization of the antenna cannot be realized fundamentally by using a high-dielectric-constant dielectric substrate, the antenna depends on the property of the dielectric substrate, and the radiation performance of the antenna is influenced by the dispersion effect in a millimeter wave frequency band. The antenna comprises a feed structure and two radiation structures. The two radiation structures are arranged in a herringbone shape, the feed structure is horizontally arranged on the lower portions of the two radiation structures, and the two ends of the feed structure are connected with the lower portions of the two radiation structures in an inserted mode respectively. The invention belongs to the technical field of communication.

An all-metal vivaldi antenna includes a ground plate, an antenna conductor that includes two radiators positioned on the ground plate and facing each other, a resonator that is formed by removing a portion of a connection part between the antenna conductor and the ground plate and shares one side with the ground plate, a tuning post that is formed in a column structure extending from the ground plate toward an inside of the resonator, and a tuning cap in a form extending therefrom.

The present invention provides a terahertz broadband high-sensitivity sensor chip based on local field enhancement and a manufacturing method thereof, which includes a Vivaldi antenna, an artificial surface plasmon waveguide with a metal groove structure, a terahertz wave is input through an input end waveguide, and the Vivaldi antenna at one end couples the terahertz wave to the artificial surface plasmon waveguide, and the terahertz wave is transmitted in the waveguide under the constraint of the artificial surface plasmon waveguide, and the terahertz wave on the waveguide is coupled back to the free space by the Vivaldi antenna at the other end and is received by the terahertz detector; a circular metal area is provided at the inner edge of the artificial surface plasmon waveguide to increase the effective working bandwidth of the sensor chip. The present invention has high sensing sensitivity and high effective working bandwidth, can reduce reflection, and improve coupling efficiency, thereby solving the resonance peak generated by the metamaterial sensor due to its special structural design, has a simple preparation process, and has low equipment price, and can be applied on a large scale.

The application discloses a low cross-polarization Vivaldi antenna and belongs to the technical field of electromagnetic fields and antennas. The low cross-polarization Vivaldi antenna comprises a dielectric substrate, a pair of radiation arms and a balanced radiation arm are arranged on the dielectric substrate, and the pair of radiation arms and the balanced radiation arm are oppositely arranged. Metal through holes are formed in the dielectric substrate, and the pair of radiation arms and the balanced radiation arm are electrically connected through the metal through holes. A dielectric director is arranged on one side of the dielectric substrate, and a reflecting floor is arranged on the other side of the dielectric substrate. The dielectric director is used for adjusting the phase difference of electromagnetic waves at the opening of the Vivaldi antenna. The reflecting floor is used for improving the front-to-back ratio of electromagnetic waves. Electromagnetic waves are radiated from the reflecting floor to the direction of the dielectric director. The application further reduces the cross-polarization level of the Vivaldi antenna and can be applied to the fields of satellite communication, ground penetrating radar, microwave imaging and UWB ultra-wideband communication.

The invention belongs to the technical field of antennas, and relates to a multiband antenna based on artificial surface plasmon, which comprises a dielectric substrate, a radiation patch arranged on the upper surface of the dielectric substrate and a microstrip line arranged on the lower surface of the dielectric substrate, the radiation patch is provided with a radiation cavity and an axisymmetric radiation groove connected with the radiation cavity, so that an arc-shaped gradually-changed radiation arm of the Vivaldi antenna is formed. A plurality of first grooves are formed in the arc-shaped edges of the radiation arms; the first groove comprises first parts and second parts which are alternately arranged; the length of each first part is larger than that of the two adjacent second parts, and the length of each second part is smaller than that of the two adjacent first parts; the distances between all the first parts and the long edge of the dielectric substrate are equal, and the distances between all the second parts and the long edge of the dielectric substrate are equal; the first groove forms an artificial surface plasmon structure so as to realize multiband. According to the invention, multiband can be realized based on the artificial surface plasmon.

The present invention discloses a ultra-wideband compact circularly polarized antenna based on a miniaturized phase shifter, belonging to the technical field of antenna engineering. The antenna of the present invention adopts the form of cascading a feeding network and a Vivaldi antenna, and has the characteristic of wide bandwidth; the broadband matching characteristic is realized by designing forms such as a metal coupling sheet, a serrated structure, and a Γ-shaped balun; a novel miniaturized ultra-wideband 90-degree phase shifter is designed by adopting a Π network and a negative group delay circuit; both the Vivaldi antenna layer and the feeding network layer adopt the PCB process, which is easy to process and has low cost. Compared with the traditional phase shifter, a 75% size reduction is achieved, and its size is 67mm * 44.5mm (0.071λ l * 0.047λ l ). At the same time, the simulation results show that the proposed circularly polarized antenna has a 10 dB impedance bandwidth of 0.32 - 1.2 GHz (3.75:1) and a 3 dB axial ratio bandwidth of 0.32 - 1.15 GHz (3.59:1).

The present invention discloses a photonic antenna operating at 275 - 296 GHz, belonging to the fields of optoelectronics and terahertz communication; it includes two UTC-PD bodies and a passive structure; the UTC-PD body adopts a double mesa structure, and each structure leads out electrodes through electroplated small pads, and metal bumps are processed on the small pads to generate electrical connection with the passive structure through flip-chip bonding. The passive structure includes an impedance matching circuit, a power combiner circuit, and a Vivaldi antenna; the UTC-PD body generates signals, and a built-in electric field is introduced by using a gradient-doped absorption layer; a cliff layer is provided between the absorption layer and the collection layer; then, after the signal passes through the impedance matching circuit and the output impedance is close to 50 ohms, the two combined output signals are superimposed on the feed end of the Vivaldi antenna through the power combiner, and finally, it is converted into high-frequency electromagnetic waves in the 275 - 296 GHz frequency band for radiation. The present invention generates and emits electromagnetic waves in the terahertz frequency range, achieving technical performances of high bandwidth, high gain, and low insertion loss.

The invention provides an antenna unit, an antenna array and security inspection equipment for millimeter wave security inspection imaging. The antenna unit is provided with a radiation end. The antenna unit includes: a horn antenna upper portion provided with a first slot thereby forming a first horn structure; the SIW-based ultra-wideband Vivaldi antenna part is arranged below the horn antenna upper part and is provided with a tapered line radiation structure, and the tapered line radiation structure is positioned below the first horn structure; the horn antenna lower part is located below the SIW-based ultra-wideband Vivaldi antenna part and is provided with a second groove and a plurality of metalized through holes formed in the two sides of the second groove; the bonding layer is positioned between the ultra wide band Vivaldi antenna part based on the SIW and the lower part of the horn antenna; and the base is positioned below the lower part of the horn antenna. The antenna unit is an end-fire antenna capable of limiting the transmission direction of millimeter waves.

The invention discloses a ferrite-loaded dual-polarization wing conformal Vivaldi ultra-wideband one-dimensional phased-array antenna, which comprises a wing carrier contour, a horizontal polarization Vivaldi conformal linear array, a vertical polarization Vivaldi conformal linear array, a vertical polarization embedded dielectric plate, a horizontal polarization embedded dielectric plate, a decoupling patch, a partitioned ferrite, a micro-strip power divider, a fixed substrate and a metal floor, according to the utility model, a conformal and embedded combined layout is adopted, dual-polarization efficient radiation is realized, and electromagnetic coupling interference between two polarization units is suppressed by slotting above horizontal polarization Vivaldi units at two sides, loading decoupling patches and adopting a cross layout; the block type ferrite is located at a specific position above the metal floor; according to the invention, the layout and the appearance of the dual-polarized Vivaldi antenna are designed to realize complete conformality, the end-on-fire gain of a wing carrier under the constraint of a limited space is remarkably improved by utilizing the characteristics of the Vivaldi antenna, and excellent performances such as ultra wide band, wide-angle scanning and low profile are realized by loading ferrite materials.

The utility model provides an ultra-wideband antipodal Vivaldi antenna for an airborne radar, which is used for solving the technical problems of small detection range and low resolution of the airborne radar caused by low low-frequency gain, narrow working band and poor directivity of the conventional antipodal Vivaldi antenna. The antenna comprises a dielectric substrate and a radiation unit, the radiation unit comprises a first radiation arm and a second radiation arm which are symmetrically arranged, the first radiation arm is printed on one side of the front surface of the dielectric substrate, the second radiation arm is printed on one side of the back surface of the dielectric substrate, and a reflection floor is arranged at the line tail part of the back surface of the dielectric substrate. And the reflection floor is connected with the second radiation arm. According to the utility model, radiation current at the edge of the antenna is reduced through the slot at the edge of the antenna, so that the current can be spread along inner edge slot lines at two sides of the antenna all the time and mutually coupled to generate radiation; by adding the reflection floor at the tail part of the back surface of the dielectric substrate, electromagnetic waves can be reflected, and the antenna gain is improved.