176results about How to "Low cross polarization" patented technology

The present invention provides a new class of hybrid-mode horn antennas. The present invention facilitates the design of boundary conditions between soft and hard, supporting modes under balanced hybrid condition with uniform as well as tapered aperture distribution. In one embodiment, the horn antenna (100) is relatively simple mechanically, has a reasonably large bandwidth, supports linear as well as circular polarization, and is designed for a wide range of aperture sizes.

The invention discloses a broadband low cross-polarization printed dipole antenna with a parasitic element. The antenna has the advantages of broad frequency band, low cross-polarization, stable directional diagram, small size and simple structure. The antenna adopts a double-layer printed dipole way, and meanwhile, rectangular patches are uploaded on the upper end and at two sides of a dipole arm. The broadband low cross-polarization printed dipole antenna has the basic structure as follows: a metal earth plate, two layers of dielectric slabs, strip line feeding balun, a double-layer printed dipole arm, a rectangular patch arranged on the upper end of the dipole arm, rectangular patches arranged at two sides of the dipole arm and an SMA (Small A Type) joint. The greatest innovation of the broadband low cross-polarization printed dipole antenna is that the ultra broadband character and stable directional diagram character are obtained through uploading the parasitic elements in the manner of the rectangular patches on the upper end and at two sides of the double-layer printed dipole arm, 75% of bandwidth can be achieved under the condition that the standing-wave ratio is smaller than 1.5, and meanwhile, the broadband low cross-polarization printed dipole antenna has a stable directional diagram in the bandwidth, low cross-polarization and grain up to 6.1-9.3dBi. The size of the antenna is reasonably changed, i.e., other concrete embodiments of the invention can be formed.

The invention discloses a millimeter wave folding-type reflective array antenna integrated with a plane feed source. The millimeter wave folding-type reflective array antenna is of a layered structure and is sequentially provided with a polarization grid, a reflective array and the plane feed source from top to bottom. On the basis of a plane substrate integration waveguide structure, a substrate integration waveguide gap array antenna is used as the feed source for conducting feed on folding-type reflection, phase compensation is obtained on a reflection face, spherical waves are converted to plane waves, and therefore the antenna which is high in gain and efficiency and stable in beam pointing is realized. Under the Q-LINKPAN application background and directing at the development demands of a plane-integration and miniaturized long-distance wireless communication system, the low-section antenna which is high in gain and efficiency and capable of being integrated with a plane millimeter wave circuit is realized, the millimeter wave folding-type reflective array antenna has the advantages of being simple in structure, compact in size and low in cost, and the requirements for plane circuit integration are met.

The invention relates to a broadband dual-linear polarization cone chopping groove antenna; a cone chopping groove radiating paste with a parasitic element and an inclined side is established; a series of metallic via holes are arranged at outline edges of the index line of the cone chopping groove antenna and a feed microstrip line; moreover, two linear polarized cone chopping groove antenna units are aligned according to T-shaped structure with disconnected middle part, so as to form a dual-line polarized antenna. The broadband dual-linear polarization cone chopping groove antenna has the property of wide wave beam of the broadband, and can eliminate the standing wave distorted point caused by resonance in scanning the wide angle of the broadband.

The invention belongs to the field of the antenna technology, and particularly relates to a broadband high-isolation low-cross-polarization dual-polarization microstrip antenna array based on an SIW technology which can be used for various aspects, such as satellite communications, radar orientation, and synthetic aperture radar. The broadband high-isolation low-cross-polarization dual-polarization microstrip antenna array based on the SIW technology comprises 5 layers of printed circuit boards and 54 integrated metal props. In five layers of the printed circuit boards, the medium of the first layer of the printed circuit board and the medium 20 of the second layer of the printed circuit board are Rohacell HF51 foams, the medium of the third layer of the printed circuit board, the medium of the fourth layer of the printed circuit board and the medium of the fifth layer of the printed circuit board are Rogers 5880 medium boards. The antenna is designed on the basis of the microstrip antenna, and the antenna is integrated with the feed and radiation. The structure is simple, and the printed circuit technology is used for producing. The broadband high-isolation low-cross-polarization dual-polarization microstrip antenna array based on the SIW technology has the advantages of low section, light weight, high precision and low cost.

The invention discloses a broadband foldable reflective array antenna, and belongs to the technical field of antennas. The broadband foldable reflective array antenna employs a foldable reflective array antenna structure, and provides a brand new reflective array unit, so that the foldable reflective array of the reflective array unit solves the problem that breakthrough on gain bandwidth of a conventional foldable reflective array antenna is hard to achieve. The characteristics of high gain, low loss, compact structure and low cross polarization of a foldable reflective array antenna are fully explored. The broadband foldable reflective array antenna is suitable for microwave, millimeter wave, THz frequency ranges and applicable to high performance communication or radar systems.

The invention discloses a planar antenna for a dual-frequency millimeter wave system. The planar antenna for the dual-frequency millimeter wave system comprises a radiation plate printed at the middle of a medium plate and used for emitting or receiving electromagnetic wave energy, a symmetrical E-shaped groove arranged at the middle of the radiation plate and used for providing a current path needed for dual-frequency resonance, feed structures arranged at two sides of the radiation plate and used for providing signal feed for the radiation plate, a grounding plate arranged on the lower surface of the medium plate and used for providing grounding signals, and an antenna port arranged in the lower surface of the medium plate and used for inputting differential signals to the feed structures. The planar antenna for the dual-frequency millimeter wave system is simple in structure and convenient to popularize in millimeter wave antennas, and the directional diagram height is symmetrical at the millimeter wave frequency band.

The invention relates to low-sidelobe horn antennas of micro-strip excitation, comprising a micro-strip radiator, a polarization electric bridge and a conical horn. The micro-strip radiator is adoptedto feed the horn, wherein the micro-strip radiator comprises a radiation sticker, a ground plate and a short-circuit metal post which is arranged between the radiation sticker and the ground plate and plays a supporting role. Two feed ports are arranged on the ground plate, and the polarization electric bridge is integrated on the back of the ground plate of the micro-strip radiator. The design realizes the integration of the horn antennas and a circular polarization feed source, and the structure of the whole horn antennas is compact, thereby effectively utilizing space. Meanwhile, a longitudinal groove is added at the caliber position of the conical horn for restraining the edge current of the horn, thereby restraining sidelobe and realizing the low sidelobe and low cross polarization.The invention has simple and compact structure, easy processing and good electrical property and meets the rigorous demand of satellite to space.

The invention relates to one low frequency super wide band contract field source, which comprises one butterfly antenna, feedback part, two side fix metal boards and back metal board, wherein, feedback source emission part relies on butterfly antenna and the feedback part is composed of SMA joint band wire and band tank wire structure by use of variable butterfly antenna wide band property and feedback part to realize whole feedback wide band property.

The invention relates to a low-profile low-cross-polarization dual-polarized broadband antenna comprising a resonant cavity, an upper microstrip board, a lower microstrip board, four feed probes and a coaxial medium. A rectangular upper-layer copper foil paster is arranged at the middle of the top surface of the upper microstrip board; and a rectangular lower-layer copper foil paster is arranged at the middle of the bottom surface of the lower microstrip board. The four feed probes distributed in the resonant cavity uniformly enable the upper-layer copper foil paster to be transited to the bottom of the resonant cavity vertically in a feed mode and, together with the coaxial medium, form a coaxial radio-frequency connection port. And a 45-degree angle is formed between each side of the upper-layer copper foil paster and each side of the resonant cavity. The profile height of the dual-polarized broadband antenna is 0.1-0.15 lambda0, wherein the lambda0 expresses a free space wavelength of a central frequency point. Therefore, the antenna unit performance can be improved obviously and thus the work bandwidh reaches 60%. More than two low-profile low-cross-polarization dual-polarized broadband antennas are connected in parallel to form a low-profile low-cross-polarization dual-polarized broadband antenna array.

The invention relates to a conformal antenna array directional diagram comprehensive method based on an invasive weed optimization. The conformal antenna array directional diagram comprehensive method is characterized by at least comprising the following steps of: a step 101 of carrying out population initialization; a step 102 of carrying out growth and reproduction; a step 103 of carrying out spatial diffusion; a step 104 of carrying out competition and repulsion; a step 105 of determining if the seed number reaches the maximum number of population; a step 106 of selecting solutions, the number of which is Qsize, with best adaptive values in dependence on a competitive survival rule; a step 107 of determining if a present number of iterations reaches the largest number of iterations, and proceeding with the step 102 if the present number of iterations does not reach the largest number of iterations, i.e., iter<iter[max], and otherwise carrying out a step 108 of quitting an algorithm implementation process and outputting an optimal solution. In the conformal antenna array directional diagram comprehensive algorithm, the adaptability is set as a standard reproduction mechanism, and an offspring-and-parent competition and repulsion mechanism is employed, the conformal antenna array directional diagram comprehensive algorithm is global and effective, the algorithm is prevented from falling into a local optimal solution, and useful information is reserved to capacity.

Disclosed is a differential dual-polarized dielectric resonator antenna. The differential dual-polarized dielectric resonator antenna comprises a grounding substrate, and a crossed dielectric resonator arranged on the grounding substrate, wherein the crossed dielectric resonator is equivalent to two rectangular dielectric resonators formed in an orthorhombic manner; a group of differential feed structures are arranged at the two ends of each rectangular dielectric resonator in an mirror image manner separately; and each group of the differential feed structures are electrically connected with one group of differential feed interfaces on the other surface of the grounding substrate. The differential feed way is designed on the basis of the crossed dielectric resonator; the differential feed can suppress an electromagnetic field to be in higher mode in same-phase distribution; a virtual ground formed by the differential feed can suppress influence between orthogonal modes of the two rectangular dielectric resonators which are equivalent to the crossed dielectric resonator; therefore, when a dual-polarized radiation function is realized by the orthogonal modes of the two rectangular dielectric resonators, compared with a single-end dielectric resonator antenna, the differential dual-polarized dielectric resonator antenna disclosed by the invention suppresses a part of stray pattern, remarkably improves port isolation degree and lowers crossed polarization.

The invention discloses a broadband dual-polarization filtering base station antenna unit, a base station antenna array and a communication device. The antenna unit comprises four vibrator arms, fourparasitic branches and a feeding structure, wherein two of the vibrator arms are oppositely arranged, the other two of the vibrator arms are also oppositely arranged, the four vibrator arms are in one-to-one correspondence with the four parasitic branches, each vibrator arm is coupled with the corresponding parasitic branch, and the feeding structure is connected with the four vibrator arms; the antenna array comprises at least two antenna units mentioned above, the communication device comprises the antenna unit, or comprises the antenna array mentioned above. The radiation performance can achieve the high rolling-off filtering characteristics and the high polarization isolation, can ensure that no additional insertion loss and the occupied area by the excess structure as far as possible,can expand the bandwidth, and can reduce the height so as to achieve the stable pattern in a wide frequency band.

The invention provides a broadband coded folded reflectarray antenna based on subwavelength single-layer reflecting units, and solves the problems that the folded reflectarray antenna is narrow in bandwidth and high in design complexity. According to the antenna in the invention, a polarized grid plate and a main array surface equal in area are vertically installed at equal interval; a feed sourceis installed in the geometrical centre of the main array surface; the main array surface in the invention is composed of two subwavelength single-layer reflecting units having 180 DEG phase difference and the same structure by periodic coded arrangement according to a classical reflection array phase theory; in the two reflecting units having the 180 DEG phase difference in the invention, one reflecting unit is the 0 reflecting unit; the other reflecting unit is the 1 reflecting unit, which is formed by counterclockwise rotation of the 0 reflecting unit in 90 DEG; the folded reflectarray antenna in the invention has the high-gain pencil beam; the design difficulty of the antenna array is reduced; the bandwidth is wide; the design complexity is low; the advantages of high gain, low loss, compact structure, low cross polarization and the like of the folded reflectarray antenna are sufficiently played; and the antenna can be applied to a high-performance communication or radar system.

The present invention provides a wide beam scanning dual-frequency dual-polarization micro base station antenna applied to 5G communication. The antenna comprises includes a first dielectric plate, asecond dielectric plate, a third dielectric plate and a feed structure in order from the top to bottom. Radiation patches are affixed to the first dielectric plate and the second dielectric plate, thefeed structure is arranged on the third dielectric plate, the first dielectric plate and the second dielectric plate are coupledly fed through the feed structure of the third dielectric plate, at thesame time, a reflective floor is under the third dielectric plate, an air layer is arranged between the first dielectric plate and the second dielectric plate, and the second dielectric plate is in direct contact with the third dielectric plate. According to the antenna of the invention, the wideband characteristic of the antenna is achieved, the bandwidth of the two ports of the antenna covers the bands of 3.3-3.69 GHz and 4.75-5 GHz respectively, the antenna can be applied to the 5G communication, the high isolation and low cross polarization performance are achieved, and a 1*4 high gain antenna array is achieved through a differential feed network.

The invention discloses a tri-band measurement and control remote sensing satellite communication multi-functional composite feed source. S-band folding arm oscillator illuminators are installed at the outermost side of a common-caliber corrugated horn through the X / Ku ring loading and the differential mode compatible loading; the S-band folding arm oscillator illuminators are connected with an S-band sum-difference network to form S-band sum-difference signals; common-caliber corrugated horn through the X / Ku ring loading and the differential mode compatible loading is connected with an X / Ku six-port wave separator; Ku-band signals are directly connected backwards for output to connect with a Ku-band orthogonal mode coupler to output orthogonal Ku signals of two paths of vertical polarization and horizontal polarization; X-band signals are subjected to equal-amplitude and in-phase coupling through fourth coupling ports of the X / Ku six-port wave separator to connect with four coupling input ports of an X-band five-end synthesizer, and the output port is connected with the input port of an X-band separator circular polarizer.

The invention discloses a dual-circularly-polarized millimeter wave reflection array antenna with independently controllable beams, which comprises a broadband circularly-polarized feed horn antenna (1) and a planar reflection array (2). The broadband circularly-polarized feed horn antenna (1) is located near the focal plane of the planar reflection array (2). The planar reflection array (2) is composed of sub-wavelength dual-circularly-polarized phase shifting elements (3) arranged periodically. Each dual-circularly-polarized phase shifting unit (3) contains four metal layers, wherein a firstlayer is a metal patch (3a), a second layer is a metal floor (3c) with two H-shaped slots (3b), a third layer is composed of two metal micro-strip transmission lines (3d) of different lengths, and afourth layer is a metal base plate (3e). The antenna can realize dual-circularly-polarized highly-directional beams, can independently control the beam directions of left-hand circularly-polarized waves and right-hand circularly-polarized waves, and has a broad application prospect in wireless communication and satellite communication.

The invention discloses a low-profile high-gain dual-polarized antenna, and the antenna is characterized in that the antenna comprises a feed network layer, a second dielectric substrate layer, a metal ground layer, a first dielectric substrate layer and a radiation layer, wherein the feed network layer, the second dielectric substrate layer, the metal ground layer, the first dielectric substrate layer and the radiation layer are sequentially stacked; the antenna also comprises four metal probes which vertically pass through the feed network layer, the second dielectric substrate layer, the metal ground layer, the first dielectric substrate layer and the radiation layer, and are electrically connected with the radiation layer and the feed network layer; the radiation layer comprises a circular metal paster and four T-shaped metal pasters which generate parasitic resonance; four first openings formed by the four metal probes on the radiation layer takes the circle center of the circular metal paster as the center, thereby forming four corners of a first square. According to the invention, the antenna employs the T-shaped metal pasters as parasitic resonance structure units, thereby enabling the bandwidth of the antenna to be effectively enlarged. Moreover, the T-shaped structures and the circular paster are located in the same layer, so the machining is easy, and the large-scale production is facilitated.

The invention relates to a differential microstrip filter antenna fed by a balun filter. The structure uses a balun filter to generate the differential signal with filtering characteristics, which excites the differential fed microstrip antenna, and realizes the miniaturized differential fed microstrip antenna with filtering and radiation characteristics at the same time. The filter antenna has stable gain in the pass band, fast gain drop out of the pass band and good edge selectivity. In addition, the radiation pattern of the structure is symmetrical and the cross polarization can achieve -35dB. on both the E plane and the H plane.

The invention belongs to the technical field of antenna design, and discloses a truncation metasurface-loaded low-profile broadband high-gain omnidirectional surface-wave antenna. The antenna comprises a metasurface formed by m*m equivalent period patch units; the metasurface is printed on a first dielectric substrate; a circular patch and a truncation metasurface annular structure are printed on a second dielectric substrate; the truncation metasurface annular structure is loaded on the periphery of the circular patch; the first dielectric substrate is positioned above the second dielectric substrate; and the first dielectric substrate and the second dielectric substrate are isolated by air dielectric. Compared with the existing surface-wave antenna without loading the structure, the truncation metasurface annular structure converts electromagnetic energy below the circular patch into surface wave outside the circular patch, so that surface wave diffraction is increased, thereby improving the bandwidth and antenna gain; certain air dielectric exists between the dielectric substrates; and therefore, compared with the existing surface-wave antenna without loading the air dielectric structure, the circular patch can excite surface wave by air coupling, and the surface wave can be propagated along the metasurface.

The invention discloses a Ku-band balanced feed dual-band dual-polarized dielectric horn antenna, which comprises a stepped gradient dielectric horn antenna, an upper balanced feed network and a lowerbalanced feed network, wherein the stepped gradient dielectric horn antenna is formed through superposing multiple layers of stepped dielectrics; a profile structure of a horn is enclosed in each layer of dielectric through disconnected metalized slots; the upper balanced feed network is used for achieving a horizontally polarized wave; and the lower balanced feed network is used for achieving avertically polarized wave. According to the Ku-band balanced feed dual-band dual-polarized dielectric horn antenna, the problem of a grating lobe of a traditional waveguide horn antenna during array forming is solved; the dimension of the Ku-band balanced feed dual-band dual-polarized dielectric horn antenna is greatly reduced; furthermore, the Ku-band balanced feed dual-band dual-polarized dielectric horn antenna is very simple in structure and very convenient to process, debug and install; and the Ku-band balanced feed dual-band dual-polarized dielectric horn antenna has the characteristicsof being wide in band, high in isolation, low in cross polarization and high in efficiency and has the characteristics of being simple in feed networks, low in loss and convenient to integrate.

The invention discloses a portable double-offset-parabola antenna which comprises a main reflecting face, an auxiliary reflecting face, a main-reflecting-face supporting device, an auxiliary-reflecting-face fixing device, a feed source system, a feed source supporting device and a servo motor. The main reflecting face is fixed to the main-reflecting-face supporting device, the auxiliary reflecting face is fixed to the main-reflecting-face supporting device through the auxiliary-reflecting-face fixing device, the servo motor is fixed to the position below the main-reflecting-face supporting device, the feed source system is fixed to the main-reflecting-face supporting device through the feed source supporting device, and the main reflecting face is of a transverse elliptic structure, that is, the width of the main reflecting face is larger than the height of the main reflecting face. Compared with an existing Gregory antenna, the performance of the antenna is guaranteed; meanwhile, the portable double-offset-parabola antenna has the advantages that the focal length is small, the caliber is small, a feed source is small, and the performance is excellent; the portable double-offset-parabola antenna has the structural advantages of being simple in structure, light in weight, easy to machine and low in cost.

The invention discloses a differential feed dual-polarization direction diagram reconfigurable antenna. The antenna comprises a medium substrate, an antenna radiation unit, a micro-strip line feed structure, parasitic units and a coaxial feed unit; the antenna radiation unit comprises a first double dipole and a second double dipole vertical to each other; four pairs of parasitic units are arranged around the antenna radiation unit; each pair of parasitic units load the switch; the micro-strip line feed structure comprises a first feed micro-strip line and a second feed micro-strip line in mutual vertical arrangement, and an intersection point is located at a center point of the medium substrate; and the coaxial feed unit performs the feeding on the antenna radiation unit. The differentialfeed structure disclosed by the invention is convenient to integrate with a radio frequency front-end. The differential feed dual-polarization direction diaphragm reconfigurable antenna has the advantages of being small in volume, light in weight and simple in structure, the polarization way of an x axle direction and a y axle direction, and the reconfigurable direction diaphragm of each of the Esurface and the F surface can be realized.

The invention discloses a micro-strip reflective array antenna, and mainly solves problems in the prior art that the structure is complicated and the bandwidth is narrower. The micro-strip reflectivearray antenna is formed by periodically arranging a plurality of horizontally and longitudinally uniformly arranged paster units. A reflecting phase of each paster unit is different, and an arrangement period D is 0.3-0.5 Lambda. Each unit successively comprises a paster (1), a medium substrate (2) and a floor (3) from top to bottom. The paster (1) uses a circular structure. The circular paster isprovided with two pairs of gaps (11). The two pairs of the gaps (11) are positioned at two ends of two mutual perpendicular diameter lines of the circle. The micro-strip reflective array antenna is capable of improving the gain bandwidth, simple in structure, smaller in cross-polarization, and good in unit frequency characteristic curve parallelism, and can be used for the electromagnetic wave regulation and control of a microwave band.

The present invention discloses a differential feed dual-polarization filtering broadband antenna. The antenna comprises a dielectric substrate and a metal floor; the upper dielectric substrate is arranged above the metal floor, and air is filled between the two; the upper surface of the upper dielectric substrate is printed with a square patch, and the square patch is etched with a cross gap; themetal floor is etched with a defect structure, the defect structure is composed of four opening ring gaps, the opening direction is directed to the center of the metal floor, and the four opening ring gaps are diagonally symmetrical relative to the metal floor; and the square patch is differentially fed by a coaxial probe, and the coaxial probe is arranged near the end of the cross gap of the square patch, is arranged on the central axis of the square patch and is symmetrical relative to the center point of the square patch. The antenna provided by the present invention has a simple structure, can reduce the loss of the antenna feeding portion, is more suitable for designing with a planar antenna array, is easy to process, has a low cost and weight, and can be mass-produced.

The invention relates to a high-gain differential dual-polarized dielectric patch antenna based on a high-order mode. The antenna comprises a lower dielectric substrate, a metal reflection floor, an upper dielectric substrate and a dielectric patch which are stacked in sequence, wherein two pairs of microstrip feeders are arranged on the lower surface of the lower dielectric substrate; four metalpatches are arranged on the upper surface of the upper dielectric substrate; and the metal patches are connected with the metal reflection floor through metallized through holes. The metal patches andthe metalized through holes form grounding rods. The antenna works in two pairs of degenerate high-order mode TM121 and TM321 modes so as to realize high gain. The four grounding rods not only can move up the frequency of the TM121 mode to further improve the gain, but also can reduce the input impedance of the TM321 mode to enable the TM321 mode to be excited, thereby expanding the bandwidth ofthe antenna. TM121 and TM321 modes in respective directions are excited through two pairs of orthogonal differential feed structures, and the dual-polarized dielectric patch antenna is designed and has excellent performances of high isolation, high gain, low cross polarization and the like.

The invention provides a tri-polarized vehicle-mounted antenna applied to a 5G-V2X Internet of Vehicles communication system. The tri-polarized vehicle-mounted antenna comprises a circular dielectricplate, a square dielectric plate, a feed structure and eight groups of inverted L-shaped units, the circular dielectric plate is arranged below the square dielectric plate, and an omnidirectional radiation unit is arranged in the middle of the circular dielectric plate and is responsible for 5.85-5.925 GHz direct connection communication frequency bands; the square dielectric plate is located above the omnidirectional radiation unit of the circular dielectric plate. The center of the square dielectric plate and the center of the circular dielectric plate are located on the same vertical centerline, the area of the square dielectric plate is smaller than that of the circular dielectric plate, and a directional radiation unit is arranged on the square dielectric plate and is responsible fordirectional radiation of a wide coverage surface in 3.30-3.60 GHz and 4.80-5.00 GHz frequency bands. The antenna has the characteristics of triple polarization, low cross polarization, high port isolation, directional radiation mode wide beam and omnidirectional radiation mode low out-of-roundness, realizes relatively high gain on an azimuth angle plane, and meets 5G-V2X requirements.

The horn (11) comprises a plurality of transition steps can also be provided to increase the control of amplitude and phase content of the TE11 and TM11 modes at the output of the corn horn mouth (17) and suppress the unwanted TE12 mode. This control of the mode content provides for minimizing the length of the multimode horn antenna for a desired aperture size at the desired operational bandwidth, and provide low sidelobes and low cross-polarization, over a relatively wide bandwidth, with high electrical efficiency.