159 results about "Vivaldi antenna" patented technology

The invention belongs to the technical field of microstrip array antennae and particularly relates to a super-surface based variable-polarization multifunctional microstrip array antenna. The microstrip array antenna consists of a feed source and a microstrip array, wherein the feed source is arranged at a focus of the microstrip array; the feed source is a broadband Vivaldi antenna, adopts microstrip coupled feed, and consists of upper slotting metal, a middle dielectric plate and a lower microstrip line; the microstrip array consists of N*N GMS units; each GMS unit is composed of three layers of metal structures and two layers of dielectric plates; each layer of metal structure is obtained by etching CDSRRs with different rotational angles on a square patch; the upper, middle and lower structures are identical in parameter; and only the CDSRRs are clockwise rotated at an angle of 45 degrees in sequence. According to the antenna, a reflection function and a transmission function are integrated, the function switching among the reflection function, a bidirectional radiation function and the transmission function of the microstrip array is realized, and the polarization state switching between a co-polarization state and a cross-polarization state is realized. The antenna has the characteristics of high reusability, high integration level, numerous functions and the like.

The invention discloses an ultra-wideband planar phased array antenna and a beam scanning method thereof, and relates to the technical field of antennas. The ultra-wideband planar phased array antennacomprises a dielectric substrate, and a liquid crystal phase shifter network which is externally applied with a bias voltage and arranged on the dielectric substrate, wherein the liquid crystal phaseshifter network is composed of a plurality of liquid crystal phase shifter units. An antenna unit array which covers a plurality of frequency bands is arranged above the liquid crystal phase shifternetwork; and the antenna unit array is composed of a plurality of antenna units, wherein the antenna unit is a Vivaldi antenna with a slot line, and a liquid crystal phase shifter is powered through amicrostrip line-slot line structure. Compared with the prior art, the problems that the ultra-wideband phase-controlled profile is high in profile degree, large in antenna loss and low in utilizationrate are solved.

The invention provides a handheld wave-absorbing material reflectivity measuring device. The handheld wave-absorbing material reflectivity measuring device comprises a metal test platform, a to-be-measured sample plate or a standard sample plate, a supporting cover, an arched guide rail, a near-field focusing antenna, a wave-absorbing partition plate, sliding blocks, a lifting rod, a push-pull rod and a receiving and transmitting module. According to the handheld wave-absorbing material reflectivity measuring device, the near-field focusing antenna which is a novel double-antipodal structure Vivaldi antenna replaces a horn antenna to serve as a receiving and transmitting antenna, the antenna is small in size and weight, and has the low standing-wave ratio in a wide band, the high gain and the low side lobe characteristic, a near-field linear polarization plane wave can be generated, the far-field radiation environment is simulated on a near field, a test area moves from an antenna far-field area to an antenna near-field area, and test space is reduced; due to reduction of the distance between the to-be-measured sample plate and the antenna, the to-be-measured sample plate can be more intensively irradiated through an electromagnetic wave, and the influence of background reflectance on the test accuracy is reduced; meanwhile, electromagnetic wave incidence and a reflection angle can be accurately adjusted, the accuracy of a receiving-and-transmitting antenna positioning angle is improved, and the complex rate of operation is reduced.

The invention relates to a high gain broadband dielectric lens Vivaldi antenna. The array antenna comprises a substrate, a radiation slot, a dielectric lens and a Chebychev tapered strip line feeder. According to the high gain broadband dielectric lens Vivaldi antenna, through changing the structural size of the dielectric lens, the fluctuation of antenna radiation impedance can be effectively improved so as to obtain better impedance matching, the transmission speed of an electromagnetic wave in the slot can be reduced according to the high dielectric constant of the lens, the current distribution on an antenna aperture is improved, thus a spherical wave is a nearly a plane wave, the antenna radiation efficiency is raised, and a higher antenna gain is obtained. According to a Chebychev tapered strip line, the impedance matching of the antenna can be improved further, and the working band is broadened. The array antenna in the invention has the characteristics of high gain and broad band and is suitable for a radiation unit of wideband array antennas of the field of mobile communication and a military radar.

The invention relates to the technical field of antennas, and particularly relates to a high-gain Vivaldi array antenna loaded with a director. The high-gain Vivaldi array antenna comprises a microstrip SIW conversion structure, an SIW-based one-to-eight power divider and eight Vivaldi antenna units. The microstrip SIW conversion structure converts the electromagnetic waves fed in by a microstripline into the electromagnetic waves of the SIW transmission band. The microstrip SIW conversion structure comprises the microstrip line, a trapezoid microstrip transition line, a metal ground and theSIW transmission band. The SIW-based one-to-eight power divider comprises a metal layer and inductive metal through holes. Each Vivaldi antenna unit comprises a Vivaldi radiation unit, an elliptical metal patch and a semi-elliptical dielectric substrate. The 39.5-46GHz frequency band can be covered and more than 1dB of the antenna gain can be enhanced within the frequency band coverage on the basis of the original array antennas.

The invention discloses a novel miniaturized Vivaldi antenna, which is a novel Vivaldi antenna with a center frequency of 5.4GHz, a standing wave ratio of less than 2, an impedance bandwidth of 4GHz, a gain of 6.55dB, and a cross polarization ratio of -24.59dB. , the antenna also has the characteristics of small size, simple feeding, and high radiation efficiency, and can be suitable for civil wireless communication, wireless local area network (RLAN), fixed wireless access system (FWA), WiMAX and IEEE 802.11a wireless network, with Good application prospects, worth promoting.

A system and related method is disclosed including a symmetrical array of Balanced Antipodal Vivaldi Antenna (BAVA) elements. Within the array a plurality of dual polarization sub-arrays comprised of individual BAVA elements oriented in a first polarization and individual BAVA elements oriented in a second polarization. The plurality of sub-arrays maintains low mutual coupling and cross polarization rejection between sub-arrays within the array and between elements within the sub-array. As a signal is received by each of the individual BAVA elements, signals from each first polarized BAVA element and each second polarized BAVA element of a sub-array are combined to produce a single signal of the first polarization and a single signal of the second polarization per sub-array. A DF processor receives the two signals and determines the angle of arrival of the signal. A communications link within the array sends and receives information and commands for array operation.

The invention provides an ultra-broadband Vivaldi circularly polarized phased-array antenna element, which comprises four same Vivaldi antenna bodies of a stereoscopic structure and a metal reflectingplate, wherein each Vivaldi antenna body comprises a pair of ridge arms, an antenna cavity, a rectangular slot, a rectangular resonant cavity, a cylindrical coaxial outer conductor, a cylindrical coaxial inner conductor and a cylindrical coaxial feed interface; and in each Vivaldi antenna body, the antenna cavity, the rectangular slot, the rectangular resonant cavity, the cylindrical coaxial outer conductor, the cylindrical coaxial inner conductor and the cylindrical coaxial feed interface communicate with the pair of ridge arms, the pair of ridge arms is taken as a radiation area, the rectangular slot is taken as a transmission area, and the cylindrical coaxial outer conductor, the cylindrical coaxial inner conductor and the cylindrical coaxial feed interface are taken as a feeding area,so that energy receiving and transmitting are achieved by using the radiation area, the transmission area and the feeding area. The ultra-broadband Vivaldi circularly polarized phased-array antenna element designed according to the requirements of a modern radar technology on the indexes, such as the working bandwidth and the scanning angle has excellent performance of a broadband and excellent circular polarization property and simultaneously has the advantages of being miniaturized, simple in structure and low in loss, and pitching scanning at +/-35 degrees can be achieved.

The invention belongs to the technical field of antenna design, and particularly relates to a multi-octave ultra-wideband antenna and a conformal array antenna. The multi-octave ultra-wideband high-isolation antenna comprises a dielectric substrate, a feed structure and metal radiation patches attached to the front surface and the back surface of the dielectric substrate; the metal radiation patches on the front surface and the back surface of the dielectric substrate are gradual patches of the same structure and jointly form an antipodal Vivaldi antenna, and the two metal radiation patches are symmetrically distributed on the upper side and the lower side of the dielectric substrate; the metal radiation patches are defined by internal index tapered slot lines and external index tapered slot lines, and a radiation open slot is formed between the two metal radiation patches on the front surface and the back surface. According to the conformal array antenna, the antenna is used as an antenna unit, the six antenna units are uniformly arranged on the side surface of a circular truncated cone carrier, a certain gap is kept between the adjacent antenna units, and the antenna units keep the original shape. According to the invention, the low-frequency working bandwidth, the radiation gain and the directivity of the antenna are improved.

The invention discloses an anti-heel type wide-band Vivaldi antenna, which works at 5-12 GHz and has the advantages of simple structure, convenient power feeding, good directivity and the like. Its antenna type is a microstrip patch type, and its main structure includes a dielectric plate and a metal patch. The metal patch includes an impedance matching balun and two gradient metal microstrips. In order to improve the performance of the antenna, the present invention also proposes a heel-shaped Vivaldi antenna with side slots, which effectively improves the gain and bandwidth of the Vivaldi antenna; in addition, the present invention also proposes a novel asymmetrical Vivaldi antenna , the invention effectively improves the impedance bandwidth of the antenna and can adjust the radiation direction of the antenna.

The invention discloses an antipodal Vivaldi antenna based on a parasitic patch loading technology. The antenna comprises a dielectric substrate, a top layer radiation unit, a bottom layer radiation unit and a feed part, wherein the top layer radiation unit is arranged on the upper surface of the dielectric substrate; the bottom layer radiation unit is arranged on the lower surface of the dielectric substrate; the feed part consists of broadband feed baluns printed on the two sides of the dielectric substrate; the top layer radiation unit and the bottom layer radiation unit are the same in both of dimensions and structures; the top layer radiation unit and the bottom layer radiation unit are symmetrically placed relative to the narrow edge of the dielectric substrate; three parasitic patches are printed on the upper surface of the dielectric substrate; two secondary parasitic patches are symmetrically distributed relative to the main parasitic patch in the middle; and the three parasitic patches are all rectangular with sharpened two ends. By adoption of the metal parasitic patches with the shape, the antenna gain and directionality can be improved.

The invention provides a Vivaldi antenna. The Vivaldi antenna is characterized by comprising a medium plate of which one face is provided with a metal layer serving as the upper surface of the medium plate, a gradual change groove line arranged on the upper surface of the medium plate, a feed unit arranged on the medium plate, at least two fences arranged at two sides of the gradual change groove line, and at least one guiding oscillator fixed at the opening side of the gradual change groove line, wherein the gradual change groove line is shaped as a horn-shaped opening, the feed unit is used for feeding the gradual change groove line, the at least two fences are used for concentrating an electric current to the groove line, the guiding oscillator is used for guiding an electromagnetic wave to be transmitted to a specified radiation direction, and the length of the guiding oscillator is not larger than one third of the width of the opening of the gradual change groove line.

The invention discloses broadband high-gain Vivaldi antenna which a dielectric substrate, a metal patch, a quadrangular metal patch, an impedance match microstrip line and a sector-shaped metal branch. The metal patch and the quadrangular metal patch are fixed in the top side of the dielectric substrate, the impedance match microstrip line and the sector-shaped metal branch are fixed in the bottomside of the dielectric substrate, the metal patch is provided with gradual-change trough line symmetric by taking the horizontal central axis as the center and provided with a horn-shaped opening, the gradual-change trough line is of index type gradual change, the bottom end of the gradual-change trough line is provided with a circular resonant cavity, the outer sidewalls of the gradual-change trough line are provided with comb shaped grids at equal interval, the quadrangular metal patch is positioned in the opening of gradual-change trough line, one end of the L-shaped impedance match microstrip line is connected to the sector-shaped metal branch, and the impedance match microstrip line and the sector-shaped metal branch serve as a feed structure. The Vivaldi antenna of the frequency range of 2.3-8.0GH is characterized by simple structure, wide frequency band and high gain.

The invention provides a vivaldi antenna and a dual-polarized probe, which solves the problems of poor high-frequency cross-polarized levels and low port coupling isolation of existing probe antennas.The technical points are that the vivaldi antenna comprises three metal layers and dielectric plates arranged between each two adjacent metal layer; the intermediate metal layer is provided with a feeding structure, and the other two metal layers are provided with vivaldi antenna radiation structures electrically connected to the feeding structure; and the two vivaldi antenna radiation structuresare symmetric along the center line of the antenna to realize the double-grooved vitaldi structure, which effectively improves low-end standing waves, so that the antenna has a good high-frequency cross-polarization level and has a relatively high isolation degree. Meanwhile, by arranging a clamping groove in the center line position of each antenna, the orthogonal connection of two vivodi antennas can be realized by using the clamping grooves to form a dual-polarized probe, and the vivaldi structures are respectively arranged on the two sides of each clamping groove to avoid destroying the circular back cavities of the vitaldi structures. The phase centers of the two antennas of the probe can be aligned without destroying the circular slit back cavities of the vitaldi structures.

The invention discloses a high octave dual-polarized Vivaldi antenna. After a radiation element is led into the boundary S2, the impedance bandwidth of a low frequency end of the dual polarized antenna is improved, which is mainly represented in the 3-8 GHz working frequency band. After the radiation element is led into the boundary S3, the radiation performance of the antenna is improved. Since the radiation element is led into the boundary S2 and the boundary S3 and the antenna is equipped with a tray and a bottom metal ring, the impedance of the low frequency end of the dual polarized antenna is improved, the impedance bandwidth of the antenna is expanded and the small size design is achieved at the same time. Since the radiation element is led into the boundary S2 and the boundary S3 and the antenna is equipped with the tray and the bottom metal ring, and after the radiation element is loaded with periodical slots, the matching performance in the whole frequency band is improved in different levels. By adopting a medium lens type antenna shade provided with a fixing chute, effects of mounting and fixation and physical protection are achieved and the directivity and the gain of the antenna are improved at the same time. Compared with a traditional antenna, unexpected performance such as comparatively high cross polarization and dissymmetry of radiation pattern caused by dissymmetry of electric fields are avoided.

An embodiment of the invention provides a miniaturized Vivaldi antenna capable of realizing wide band. The antenna structure comprises three layers, wherein the second layer is a dielectric substrate prepared from a non-conductive material; the first layer comprises the floor in an antenna feed structure, two antenna radiation arms, two parasitic patches and two loaded lumped resistors; the third layer is a microstrip in the antenna feed structure; the two parasitic patches are arranged below the two antenna radiation arms respectively; and the lumped resistors are used for being connected with the parasitic patches and the antenna radiation arms. By virtue of the parasitic patches, the antenna dimension is not enlarged, the current path on the surface of the antenna and the equivalent electrical length can be prolonged, and the shape and the dimension can be adjustable; and by virtue of the loaded resistors, energy reflection can be reduced, and antenna impedance characteristic can be improved, so that miniaturization of the antenna can be realized effectively, and the dimension of the antenna can be less than or equal to 0.3 times of the corresponding wavelength at the lowest working frequency.

The invention relates to the technical field of a polarization sensitive array antenna sensor, in particular to conformal Vivaldi antenna-based composite polarization sensitive array device. The conformal Vivaldi antenna-based composite polarization sensitive array device is characterized in that a dielectric antenna cover is arranged, a connection ring is arranged at a bottom end of the antenna cover, a flexible dielectric substrate is arranged in the antenna cover, a dual-polarization radiator, a passive antenna and an active antenna are further arranged, a Vivaldi-shaped exciter of a cavitybacked dual-polarization waveguide aperture antenna is provided with a metal floor, a feeding microstrip, a dielectric substrate and a grounding semi-circular resonant cavity, and the impedance matching of the Vivaldi-shaped dual-polarization exciter is achieved by a joint effect of the semi-cylindrical resonant cavity and a rectangular waveguide cavity. The invention proposes a carrier-based conformal coplanar waveguide feeding ultra-wideband Vivaldi antenna structure, the integral design of the antenna cover and the antenna is achieved, and the conformal Vivaldi antenna-based composite polarization sensitive array device has the remarkable advantages of compact structure and the like and is applicable to engineering.

The invention discloses an ultra-wide-band horizontally-polarized omnidirectional connection type Vivaldi circular array antenna, and mainly solves the problems of wide frequency band, omnidirectional horizontal polarization and miniaturization of an antenna cannot be satisfied in the prior art. The ultra-wide-band horizontally-polarized omnidirectional connection type Vivaldi circular array antenna comprises a radiation unit (1), a feeding network (2) and a dielectric plate (3), wherein the radiation unit (1) is a 16-element connecting type Vivaldi antenna array which is formed by a Vivaldi unit around a center in a rotating manner; the feeding network (2) adopts a one-into-sixteen broadband Wilkinson power divider and a coupling microstrip feeder line; electromagnetic energy is coupled to the radiation unit through the coupling microstrip feeder line; the dielectric plate (3) adopts a Kangtaini (a Chinese brand name)dielectric plate with a dielectric constant of 2.55; the radiation unit and the feeding network are printed on the upper and lower surfaces of the dielectric plate; and the centers of the radiation unit and the feeding network coincide with that of the dielectric plate. The circular array antenna has the characteristics of ultra wide band, omnidirectional horizontal polarization and miniaturization, and can be used in a full-coverage ultra-wide-band wireless communication system in the peripheral regions.

The invention discloses a broadband, high-gain and double-slot Vivaldi antenna, which comprises a dielectric plate, a double-slot tapered slot line, edge waves and a feed element, wherein one surface of the dielectric plate is provided with a metal layer as the upper surface; the double-slot tapered slot line is arranged at the upper surface of the dielectric plate and is in an exponential gradient trumpet-shaped opening; the edge waves are arranged on the upper surface of the dielectric plate; and the feed element is arranged on the lower surface of the dielectric plate and is used for feeding the tapered slot line. By the technical scheme disclosed by the invention, the radiation gain of the Vivaldi antenna within a complete working band can be improved.

The invention discloses a balance antipodal Vivaldi antenna adopting unsymmetrical medium rejection and mixed grooving and relates to the field of antennas. While low cross polarization of a traditional balance antipodal Vivaldi antenna is kept as an advantage, the problem that due to asymmetry of the traditional balance antipodal Vivaldi antenna, a main lobe of the E face of the antenna deviates is solved. Each floor metal layer is attached to the lower surface of a medium substrate layer, a conductor metal layer is attached to the upper surface of the lower medium substrate layer, the conductor metal layer and the floor metal layers extend to the two sides respectively to form metal arms, the metal arms formed by the floor metal layers and the metal arm formed by the conductor metal layer are symmetrical in structure, the outer sides and the inner sides of the metal arms are of curve structures, the lower medium substrate layer located between the curve on the inner side of the conductor metal layer and the curve on the inner side of the lower floor metal layer is rejected, and the rejected lower medium substrate layer is provided with one more medium section compared with the curves on the inner sides of the floor metal layers. The balance antipodal Vivaldi antenna is used for working within the working frequency of 10-40 GHz.

A high-performance, broad-band antenna that is small enough to be used in an array for biomedical imaging, yet has an aperture large enough to allow operations in the 1 GHz to 2.7 GHz frequency range. The present antenna advantageously uses a Vivaldi antenna with unique lobe designs to provide a small antenna that provides excellent near field imaging. The ends of each lobe have a tilted half-disc shape that increases the aperture of the antenna without increasing overall size. Other unique features of the lobes include exponential structures and an impedance matching design. Multiple units of the present antipodal Vivaldi antenna can be used in an array of antennas. Such an array, or stack or multiple arrays, can be used in many microwave applications for biomedical imaging.

The invention discloses a dual-polarized ultra-wide-band wide-angle scanning Vivaldi antenna array. The antenna array comprises an antenna pedestal and a plurality of metal arrays arranged on the pedestal in an array mode. Each metal array comprises four antenna arms which are arranged 90 degree apart along a circumference. The two adjacent metal arrays are spliced together. The two adjacent antenna arms on the adjacent metal arrays are spliced together to form one antenna unit. The two adjacent antenna arms on the adjacent metal arrays are connected through a microstrip plate. An ultra-wide-band wide-angle scanning problem is solved. Through optimizing an antenna parameter, a 0.3-1.5GHz operating frequency band, +/-45 degree wide angle scanning, and a -13dB maximum side lobe can be realized. A system requirement is satisfied. When a system noise is reduced, the effective aperture requirement of the array is less. An antenna unit number, an LNA unit number, a data processing module andthe like can be effectively reduced, and then the cost of the whole system can be greatly reduced. In the invention, through designing a microstrip plate barron, the noise is reduced and cost is greatly decreased.

The invention belongs to the ultra wide band antenna technology in the field of airborne communication and particularly relates to a small side-feed antipodal Vivaldi antenna with resistor loading. The antenna is a microstrip antenna with a simple structure and is formed by the order stacking of an upper layer metal layer, a medium base plate, and a lower layer metal layer. According to the antenna, on the basis of a traditional antipodal Vivaldi antenna, a feeder is bent to a side, the size of the antenna is reduced greatly, and the miniaturization degree is raised. The width of the feeder is changed in a step way, and thus the antenna maintains good input impedance matching in a wider bandwidth. The directivity is improved by using the modes of resistor loading and a parasitic patch. A loading metal with a special shape is used, and thus a high gain is maintained while the directivity is improved.

The invention belongs to the technical field of wireless communication, and discloses a miniaturized multiband common-aperture circularly polarized antenna. The antenna is provided with three antennas, a metal back cavity, a metal bottom plate, a strip line power division network and two 3dB directional couplers, wherein an X-band dual circularly polarized antenna is located on the upper layer, the SC-band dual circularly polarized antenna is located on the lower layer, and the L-band omnidirectional circularly polarized antenna clings to the inner side of the metal back cavity; the metal backcavity and the three circularly polarized antennas are coaxially arranged; a strip line power division network and two 3dB directional couplers are arranged on the inner side of the metal back cavity. The two broadband wide-angle coverage dual circularly polarized antennas both use a crossed Vivaldi antenna, and dual circular polarization is realized through the 3dB directional couplers. According to the invention, the omnidirectional circularly polarized antenna employs four identical inverted F antennas which are connected through an equal power division strip line network. The antenna is compact in structure and simple in manufacturing process, the three antennas are independent of one another and do not influence one another, and multi-band common-aperture work is achieved.

The invention discloses a vivaldi antenna, and relates to the technical field of antennas for communication. The vivaldi antenna comprises a first antenna unit and a second antenna unit of the same size, wherein the first antenna unit and the second antenna unit include antenna dielectric plates and radiation patches; an upper side of the middle of a dielectric layer on the first antenna unit is provided with a first slot from top to bottom; the radiation patch on the second antenna unit is symmetrically arranged on an upper surface of the dielectric layer with the first slot as an axis of symmetry; a lower side of the dielectric layer on the second antenna unit is provided with a second slot from bottom to top; the radiation patch on the second antenna unit is symmetrically arranged on the upper surface of the dielectric layer with the second slot as an axis of symmetry; and the first antenna unit and the second antenna unit are connected together in a crosswise manner. The vivaldi antenna has the advantages of high gain, high efficiency and radiation stability.