47 results about "Vivaldi antenna" patented technology

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 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.

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 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.

The application discloses a kind of ultra-wideband miniaturized Vivaldi antenna based on normalized length space method and manufacturing method, and relates to an ultra-wideband miniaturized Vivaldi antenna and manufacturing method.The present application is to solve the problem that the existing miniaturization method generally faces bandwidth narrowing and design complexity improvement.The antenna substrate according to the present application is provided with a slot line on the front surface, and the bottom of the slot line is connected with a circular slot line.The back surface of the substrate is provided with a fan-shaped metal patch, and the fan-shaped metal patch is connected with the bottom edge of the substrate through a feed line.The steps of the antenna manufacturing method according to the present application include step 1, etching process is used to manufacture a traditional Vivaldi antenna structure on a selected substrate;step 2, after the traditional Vivaldi antenna structure is manufactured, a K value is introduced into the slot line function using the normalized length space method, and the ultra-wideband miniaturized Vivaldi antenna is manufactured.The application belongs to the field of communication technology.

The invention discloses an ultra-wideband high-power capacity metal Vivaldi antenna based on local medium loading. The ultra-wideband high-power capacity metal Vivaldi antenna comprises a metal Vivaldi antenna unit, an index gradual change region patch, an impedance conversion region medium patch, an excitation point loading medium and a coaxial loading medium, the metal Vivaldi antenna unit is used for radiating signals and is provided with an index gradual deformation opening, an impedance conversion opening, an excitation point slot line opening and a coaxial feed hollow area from top to bottom; the index gradual change area patch covers the surface of the index gradual deformation opening; the impedance conversion area dielectric patch covers the surface of the impedance conversion opening; the excitation point slot line opening is filled with the excitation point loading medium; and the coaxial loading medium is filled in the coaxial feed hollow area. According to the invention, the overhigh electric field intensity at the edge of the surface part of the antenna unit is effectively reduced, and the breakdown threshold of the partial region is improved, so that the overall power capacity of the antenna is improved.

The invention relates to the field of antenna design, and discloses a VIVALDI antenna for RCS (radar cross section) detection, which comprises a base and a packaging ring mounted on the base, the packaging ring is connected with a plurality of base plates positioned on the outer side of the base, two surfaces of each base plate are sequentially connected with metal radiating surfaces, and the metal radiating surfaces are metal radiating surfaces of the antenna. Antenna index slot lines are further arranged on the two faces of the base plate, the base plate is connected with first open-circuit branches extending into the antenna index slot lines, a certain number of open-circuit branches are loaded on the metal on the two sides of the VIVALDI antenna index slot lines, the surface impedance of the antenna radiating surface can be changed through introduction of the open-circuit branches, and the antenna radiating surface can be improved. The resonance phenomenon of the antenna can be eliminated through the proper branch knot loading position, and the effect of suppressing the distortion of a directional diagram is achieved; in addition, the antenna can serve as a director of the antenna, and the directional diagram distortion effect of the antenna is relieved.

The application relates to the technical field of ground penetrating radar antennas, and discloses an ultra-wideband high-gain Vivaldi antenna loaded with wave-absorbing materials, which comprises a dielectric substrate with a feeding end and a radiating end arranged oppositely and comprising a first plate surface and a second plate surface arranged oppositely; an antenna radiator arranged on the first plate surface and having two radiation arms, the two radiation arms each having a first radiation arm surface facing each other, the two first radiation arm surfaces extending in a direction away from each other from the feeding end to the radiating end so that a gradually expanding groove is formed between the two first radiation arm surfaces; a circular matching groove is arranged on the antenna radiator and close to the feeding end; a wave-absorbing module is arranged on each side end of the two radiation arms away from each other; a metal director is arranged on the first plate surface and located at the radiating end; a reflector is internally provided with a reflection cavity, at least part of the feeding end is inserted into the reflection cavity, and a spacing is formed between the feeding end and the side wall of the reflection cavity. The Vivaldi antenna can alleviate the defects of low gain at low frequency, insufficient impedance bandwidth and low front-to-back ratio of the conventional Vivaldi antenna.

It consists of a Vivaldi (4) Palm Tree class antenna connected to port 1 (8) of a vector network analyzer (5) by a coaxial cable (9), and in front of the Vivaldi (4) Palm Tree class antenna, a test tube (10) containing dielectric material (liquid under analysis) is inserted. This material is identified by its dielectric characteristics through the analysis of the reflection coefficient of an ultra-wideband (UWB) signal that ranges from 1500 to 2500 MHz with a power of 1 dBm.

The invention discloses a mechanical arm adaptive dual-polarization miniaturized Vivaldi antenna which comprises a horizontal polarization antenna printed board, a vertical polarization antenna printed board and a reflection floor. A director, an index gradual change slot line and a decoupling extension branch knot are printed on the bottom layer of a polarized antenna printed board, a fan-shaped microstrip line and a gradual change microstrip line are printed on the top layer of the polarized antenna printed board, and an index contour slot, a circular resonant cavity and a circular slot line resonant cavity are formed in the index gradual change slot line; the substrate supporting structure is formed by extending two printed board substrates and used for forming an air gap between the antenna and the reflection floor, and the two printed boards are arranged in a staggered mode through slotting. The reflection floor is provided with a slot and a hole which are respectively used for fixing the substrate supporting structure, installing bolts and routing coaxial cables. High-frequency gain is improved through the director, low-frequency impedance matching is optimized through the slotting technology, coupling interference of the metal mechanical arm is restrained by combining an air gap and a decoupling extension branch knot, and the dual-polarization characteristic is adapted to a complex electromagnetic environment.

The invention relates to a three-dimensional ultra-wideband Vivaldi antenna, and belongs to the technical field of electromagnetic fields and microwaves. The antenna is expanded in the H-plane direction, and a traditional planar antenna is converted into a three-dimensional antenna, so that the radiation aperture area of the antenna is effectively increased, and the radiation efficiency of the antenna is improved. The antenna comprises a feed structure and a double-radiation structure, the feed structure is composed of a coaxial line, a microstrip line and two microstrip line-to-parallel double lines, and the double-radiation structure is composed of two Vivaldi antennas which are the same in shape and are in mirror symmetry. Under the condition that the size of the E surface of the antenna is kept unchanged, the radiation aperture area is increased through the three-dimensional design, the radiation efficiency of the antenna and the aperture utilization rate of the array antenna are effectively improved, the technical problems that a traditional planar Vivaldi antenna is low in radiation efficiency, and the aperture is wasted during array application are solved, and the antenna is suitable for large-scale popularization and application. And miniaturization of the array antenna can be realized to a certain extent. In addition, the antenna structure form has high universality and can be suitable for antennas in other forms.

The invention discloses a miniaturized ultra-wideband and dual-polarization angle and frequency reconfigurable Vivaldi antenna, which comprises two antenna units which are arranged in a crisscross manner, each of the two antenna units comprises a dielectric substrate, an antenna radiating surface, a feed port and a PIN diode, the antenna radiating surface is divided into a high-frequency radiating surface and a low-frequency radiating surface, and the feed port is connected with the dielectric substrate. The high-frequency radiating surface and the low-frequency radiating surface are connected through a PIN diode, and the working frequency is selected through the connection and disconnection of the PIN diode; the high-frequency radiation surface is provided with a feed port. And an auxiliary bracket capable of selecting a plurality of cross angles is arranged at the cross connection position of the two antenna units. Compared with an existing dual-polarization Vivaldi antenna, the dual-polarization Vivaldi antenna can be selectively provided with a bridge to achieve switching between single polarization and dual polarization, a multi-angle dual-polarization adjusting effect is achieved by changing the cross direction through the support, and space utilization and multi-scene application are achieved by fully utilizing the array interval size.

A 2-70GHz ultra-wideband, all-metal Vivaldi antenna includes a metal plate with a supporting base plate at its bottom. A coaxial connector passes through the supporting base plate and connects to the metal plate. An exponentially tapered curve opening is formed on the upper inner side of the metal plate, and a matching circle is formed on the lower part of the metal plate. An inclined slot is formed on the metal plate between the exponentially tapered curve opening and the matching circle. The starting end of the exponentially tapered curve opening is connected to one end of the inclined slot, and the other end of the inclined slot is connected to the matching circle. The inner conductor of the coaxial connector contacts the upper surface of the end where the inclined slot and the matching circle are connected. Traditionally designed Vivaldi antennas rarely operate at frequencies of 40GHz and above. This Vivaldi antenna, by optimizing the thickness of the Vivaldi metal plate, allows the antenna sample to operate at frequencies greater than 70GHz with a return loss exceeding 10dB. This invention features a simple structure, low cost, ultra-wideband capability, and stable radiation pattern.

The application discloses a dual-polarized pure metal Vivaldi phased array, belongs to the technical field of wireless communication, and solves the problem of how to realize dual-polarized radiation of a Vivaldi antenna and improve impedance bandwidth during antenna expansion scanning; the first Vivaldi antenna and the second Vivaldi antenna are orthogonally arranged on the upper surface of a metal base, and the orthogonal positions coincide with the geometric center of the upper surface of the metal base; the first Vivaldi antenna and the second Vivaldi antenna are internally provided with an exponential slot, a slit and a metal cavity which are sequentially connected; the first coaxial line and the second coaxial line each comprise an inner conductor and an outer conductor; the inner conductor sequentially penetrates through the metal base, the metal cavity and is connected with the bottom of the slit, and the outer conductor penetrates through the metal base and is connected with the bottom of the metal cavity; the application is based on a feeding matching structure which is sequentially connected, utilizes coaxial differential feeding and multi-stage cavities and a gradually-changing slit to jointly act, realizes good impedance transition, and can realize a wide impedance bandwidth.

The invention provides a dual-polarization Vivaldi antenna and a base station, the dual-polarization Vivaldi antenna comprises two Vivaldi antenna units which are arranged in a polarization orthogonality mode, each Vivaldi antenna unit comprises a substrate, a radiation layer is arranged on the front face of each substrate, a gradually-changed open slot is formed in each radiation layer, a feed balun is arranged on the back face of each substrate, and the feed balun is arranged on the back face of each substrate. The input end of the feed balun is used for being electrically connected with an external feed network, the feed balun is in coupling connection with the radiation layer, the feed balun is provided with an open-circuit notch to form an open-circuit section and a separated section, and the open-circuit section is connected with the separated section through a resistor. According to the dual-polarized Vivaldi antenna, each Vivaldi antenna unit feeds through a feed balun, the feed balun is provided with an open circuit gap, the open circuit gap divides the feed balun into an open circuit section and a separated section which are not connected with each other, the open circuit section and the separated section are connected with each other through a resistor, impedance matching is achieved by means of the resistor, and the open circuit section and the separated section are matched with each other. And the radiation performance of the dual polarization Vivaldi antenna is optimized.

A single elliptical loaded strip antipodal Vivaldi antenna (SELS-AVA) is formed on a substrate. The SELS-AVA includes a first elliptical flare and a second elliptical flare. A first microstrip feedline is connected to the first elliptical flare and a second microstrip is connected to the second elliptical flare. A base structure is connected to a second end of the second microstrip feedline. The SELS-AVA includes a first elliptical conducting strip connected to the first elliptical flare and a second elliptical conducting strip connected to the second elliptical flare. The second elliptical conducting strip is a mirror image of the first elliptical conducting strip. The SELS-AVA further includes a feed port having a positive terminal and a negative terminal. The SELS-AVA is configured to radiate at a lower cut-off frequency λL of about 0.69 GHz when an electrical signal is applied to the feed port.

The invention discloses a splicable dual-oblique polarization metal Vivaldi antenna array structure. The splicable dual-oblique polarization metal Vivaldi antenna array structure comprises a metal mounting plate, antenna units, SSMP fuzz button radio frequency connectors, positioning pins and sunk screws. The antenna unit is of an all-metal integrally-formed structure and comprises four radiation arms, an electric connector and a base, every two radiation arms are perpendicular to each other, the radiation arms are projected in an X shape in an overhead view, and the radiation arms and the base form an oblique angle of 45 degrees. And the antenna units in the array are staggered at + / -45 degrees to form a dual-oblique polarization triangular grid layout. The front surface of the metal mounting plate is provided with a sunken step which is embedded with a convex step at the back of the base, is positioned through a positioning pin and is fixed through a sunk screw. The SSMP fuzz button radio frequency connector is screwed in from a feed port on the back of the mounting plate, and an elastic fuzz button of the SSMP fuzz button radio frequency connector is contacted and extruded with a rectangular resonant cavity at the bottom of the radiation arm to realize welding-spot-free feed. According to the invention, the array integration level, the structural stability and the high-frequency signal transmission efficiency are improved, and the antenna is suitable for a large-scale extensible antenna system.

The application provides a method for inhibiting distortion of a VIVALDI antenna pattern of an ultra-wideband, and relates to the field of mobile communication antennas. Two horizontal slots are loaded on a metal radiation surface, one is a long slot, which is used for prolonging the path of an edge current, so that the antenna can be miniaturized to a certain extent, the length of the long slot is 75-90 mm, the width of the long slot is 3-5 mm, and the loading specific position is located at h12 above an antenna resistance loading slot, h12 is 7-12 mm; the other is a short slot which is opened on a current radiation slot of the antenna, and the loading specific position is located at h11 above the antenna resistance loading slot, h11 is 12-22 mm. The length of the short slot is 5-15 mm, and the width of the short slot is 3-5 mm. The application solves the distortion of the antenna pattern in a frequency band, and also has a certain improvement on the standing wave of the antenna.

The invention discloses a compact ultra-wideband dual-polarization four-ridge Vivaldi antenna, which belongs to the technical field of microwave and millimeter wave antennas, and comprises a radiation body, two groups of coaxial feed structures which are orthogonally arranged and a base, the radiation body comprises two groups of polarized radiation pairs which are orthogonally arranged at 90 degrees, each group of polarized radiation pair is composed of two symmetrical ridge-shaped radiation arms, and a tapered slot line which is widened from a feed end to a radiation port end is formed between the two arms; the two groups of coaxial feed structures are respectively corresponding to the two groups of polarized radiation pairs to form a differential feed structure; the base is provided with two groups of orthogonal U-shaped backing cavities which are respectively corresponding to the two groups of polarized radiation pairs. Under the compact size of 47mm * 47mm * 62mm, 6GHz-50GHz ultra-wide frequency band coverage is realized, the full-band voltage standing-wave ratio is smaller than or equal to 2.0, the port isolation is larger than or equal to 15dB, the actual gain is larger than or equal to 5dBi, meanwhile, a stable end-fire radiation directional diagram is achieved, and the technical problem that an existing ultra-wide-band antenna cannot give consideration to wide bandwidth, high isolation, stable radiation and miniaturization at the same time is solved.

The utility model relates to a low-profile horizontal polarization omnidirectional antenna, which comprises a double-sided PCB (printed circuit board) antenna radiator, a plurality of antenna radiators are arranged on the front surface of the double-sided PCB antenna radiator, and gaps between adjacent antenna radiators form a planar Vivaldi antenna pattern shape. The antenna radiators are connected together at the middle position of the double-sided PCB antenna radiator through a middle connecting part to form a petal-shaped metal radiation whole body, and the middle connecting part is conducted and connected with a core wire of the coaxial transmission line for feeding. According to the antenna, the Vivaldi principle is adopted, the four Vivaldi antennas rotate by 90 degrees to be combined, the power divider principle is utilized to divide feed into four branches, the four branches feed the four Vivaldi antennas respectively, and through microstrip impedance matching of the feed branches, the antenna has the advantages of ultra-bandwidth effect, small size and low profile, and meanwhile, the horizontal polarization characteristic is kept.

The application discloses a kind of heterogeneous antenna units and its array with ultra-wideband full-metal Vivaldi antenna scattering cancellation.The ultra-wideband full-metal Vivaldi antenna unit and the heterogeneous antenna unit have opposite exponential curvature, approximately same radiation phase, approximately opposite scattering phase, approximately equal gain and unit directional diagram. Two kinds of units form M-unit linear array along one-dimensional direction, wherein the first (M / 2) units are ultra-wideband full-metal Vivaldi antennas, and the last M-(M / 2) units are scattering-canceled heterogeneous antenna units;M-unit linear array forms N rows along another one-dimensional direction, wherein the first (N / 2) rows are arranged in positive order, and the last N-(N / 2) rows are arranged in reverse order. Through the above arrangement, while ensuring the radiation performance, the array scattering field is canceled, the array RCS is reduced, and the application prospect is wide in the new generation of stealth carrier platform.

This invention provides an end-fire Vivaldi filter antenna with independently controllable cutoff frequency based on an equivalent artificial surface plasmon polariton (ESP). It comprises a dielectric substrate, with a top layer and a bottom layer formed on the upper and lower surfaces of the substrate, respectively. The bottom layer has a ground metal layer. An ESP bandpass filter based on a hybrid substrate integrated waveguide structure is embedded in the middle of the substrate. The top layer has a first microstrip line, a second microstrip line, and a first Vivaldi antenna. One end of the first microstrip line serves as the antenna feed port and is connected to the ground metal layer via a microwave high-frequency connector. The other end of the first microstrip line is connected to the first Vivaldi antenna sequentially via the second microstrip line and the ESP bandpass filter based on the hybrid substrate integrated waveguide structure. This invention enables independent control of the passband cutoff frequency and out-of-band cutoff frequency, exhibiting independently controllable bandwidth, stable stopband, and deep out-of-band suppression capabilities.

Disclosed is an antenna structure comprising at least one Vivaldi antenna structure (602) and an antenna feed network for the Vivaldi antenna structure (602). The antenna feed network includes a hollow conductive outer portion (202) and a conductive inner portion (204) surrounded by the hollow conductive outer portion (202), with the conductive inner portion (204) located at a distance from the hollow conductive outer portion (202). The antenna structure features at least one fixture portion (302) positioned within the hollow conductive outer portion (202), which conductively couples the hollow conductive outer portion (202) to the conductive inner portion (204). The fixture portion (302) is geometrically shaped to prohibit a short circuit between the hollow conductive outer portion (202) and the conductive inner portion (204) at the operating frequency of the Vivaldi antenna structure (602).

The utility model provides a miniature vivaldi antenna, which relates to the technical field of antennas and comprises a dielectric plate, an antenna unit and a supporting groove, the dielectric plate is a square plate, and one end of the dielectric plate is arranged in the supporting groove so as to support the dielectric plate through the supporting groove; an antenna unit is installed on at least one side surface of the dielectric plate, the antenna unit comprises a left arm and a right arm, the left arm and the right arm are symmetrically arranged on one side of the top of the dielectric plate, the adjacent ends of the left arm and the right arm extend downwards towards the sides close to each other to be provided with curved surface type connecting parts, and the two sets of connecting parts extend into the supporting grooves respectively and are coaxially arranged; two opposite ends of the left arm and the right arm respectively extend to be flush with the edge of the dielectric plate; the two opposite sides of the left arm and the right arm are respectively provided with a plurality of zigzag gaps which are uniformly arranged along the edges, and the zigzag gaps introduced by the left arm and the right arm of the antenna unit increase the current flow path on the surface of the antenna, equivalently increase the radiation area of the antenna, and effectively reduce the transverse physical size of the antenna.

The application relates to an ultra-wideband circularly polarized Vivaldi antenna, which comprises a rotationally symmetric antenna and a feed network; the rotationally symmetric antenna is arranged on the feed network; the rotationally symmetric antenna comprises four Vivaldi antenna units, the four Vivaldi antenna units are orthogonally arranged in sequence, and are fixedly connected with the feed network; each Vivaldi antenna unit comprises a radiation arm, a first ground plane and a substrate; the radiation arm and the first ground plane are arranged on a first surface of the substrate, and a first side of the radiation arm is connected with the first ground plane; the first ground plane of a latter Vivaldi antenna unit is connected with a second side of the radiation arm of a former Vivaldi antenna unit, and serves as a second ground plane of the former Vivaldi antenna unit. The application adopts a half-mode form of the Vivaldi antenna, the antenna has a symmetrical and stable radiation pattern and a compact aperture size through structural multiplexing of the ground planes of the antenna units; and the antenna has good circular polarization performance in combination with the feed network which has good amplitude and phase responses.

The application provides an edge-loaded tightly-coupled broadband antipodal Vivaldi antenna array, and relates to the technical field of antennas; the antenna array comprises one or more antenna units; the antenna unit comprises a dielectric plate, a first radiation arm and a second radiation arm; the first radiation arm and the second radiation arm are arranged on the dielectric plate; the antenna unit further comprises a metal plate; the metal plate partially overlaps the first radiation arm and / or the second radiation arm and is arranged on the outer edge side of the first radiation arm and / or the second radiation arm; wherein the width of the metal plate is equal to half of the difference between the outer exponential curve opening width and the inner exponential curve opening width of the antenna unit. The application solves the problem that the existing antenna array cannot be miniaturized while maintaining high performance.

The invention discloses an absorption resistor and parasitic patch loaded elliptical slotted ultra wide band pair Vivaldi antenna, which comprises a dielectric substrate, and is characterized in that a first radiation patch and a second radiation patch are arranged on the front surface and the back surface of the dielectric substrate in a bilateral symmetry manner; a first parasitic patch and a second parasitic patch are symmetrically distributed at the top corners of the left side and the right side of the dielectric substrate; an absorption resistor is arranged between the lower edge of the first parasitic patch and the upper edge of the first radiation patch; the lower edge of the second parasitic patch and the upper edge of the second radiation patch are provided with absorption resistors. The problems that an existing antenna is poor in low-frequency matching, insufficient in gain stability, contradictory in miniaturization and performance, distorted in radiation pattern, complex in feed structure and the like are solved, and technical cooperation of ultra-wideband coverage, low standing wave, high gain stability, miniaturization and excellent directional radiation characteristics is achieved.

This invention relates to the field of antenna technology and provides an ultra-wideband, large-scan-angle Vivaldi antenna array for UAV countermeasures, comprising bifacial Vivaldi antenna elements arranged in an interleaved array structure. The bifacial Vivaldi antenna elements are electrically connected to a wideband circuit control module. The wideband circuit control module includes a wideband feed network, a transceiver (T / R) assembly, and a beam control unit. The end of the wideband feed network is directly coupled to the bifacial Vivaldi antenna elements. The bifacial Vivaldi antenna elements respond to wideband signal allocation commands from the wideband feed network. The RF output terminal of the T / R assembly is connected to the power divider port of the wideband feed network, and the RF input terminal of the T / R assembly is connected to the combiner port of the wideband feed network. The beam control unit is electrically connected to the control terminal of the T / R assembly via a high-speed serial control bus. The T / R assembly responds to control commands from the beam control unit, including azimuth commands and frequency band commands.

The invention discloses an end-fire Vivaldi excited rectangular waveguide TE10 to SIW TE20 broadband mode converter, which sequentially comprises a rectangular waveguide, a gradual change waveguide and an aluminum oxide ceramic substrate, top-layer metal and bottom-layer metal are respectively arranged above and below the aluminum oxide ceramic substrate; an end-fire Vivaldi antenna excitation structure is arranged at one end, adjacent to the tapered waveguide, of the top-layer metal; a narrow slit is formed in the center of the top-layer metal to form a grounding groove line; the end-fire Vivaldi antenna excitation structure is symmetrical about the longitudinal center line of the substrate, the whole end-fire Vivaldi antenna excitation structure is in a slotted horn shape, the wide end is connected with the gradual change waveguide, and the narrow end is connected with the grounding slot line. Two columns of metal through holes are symmetrically formed in the aluminum oxide ceramic substrate, the top-layer metal and the bottom-layer metal to jointly form an SIW transmission line; and the tail end of the grounding groove line extends into an area between the two rows of metal through holes. According to the invention, broadband high-efficiency conversion from a rectangular waveguide TE10 mode to an SIW TE20 high-order mode is realized in a terahertz frequency band.