55results about How to "Axial Ratio Bandwidth" patented technology

The invention discloses a five-frequency-section user machine antenna being compatible with Beidou and GPS (Global Positioning System) functions to be used for solving the problem that isolation between the multi-frequency-section antenna layers is poor. The five-frequency-section user machine antenna being compatible with the Beidou and GPS functions comprises a Beidou first S-frequency-section patch antenna (2), a L-frequency-section patch antenna (3), a Beidou second B1-frequency-section patch antenna (4), a B3-frequency-section patch antenna (5), a feed network plate (6), a base plate (7) and a feed probe (8); an isolating ring is arranged close to a center of the Beidou second B1-frequency-section patch antenna (4) and the B3-frequency-section patch antenna (5); an input end of the feed network of the L-frequency-section patch antenna (3) is provided with a U-shaped nodule; the four patch antennas (2), (3) and (4) and (5) are sequentially arranged from high to low and top to bottom; the feed network plate (6) is fixed at the lower end of the structure; the upper end and the lower end of the feed probe (8) are respectively connected with a corresponding patch and the feed network. The five-frequency-section user machine antenna is compatible with the Beidou and GPS functions and is applicable to vehicle-mounted and shipborne navigation equipment.

A substrate-integrated waveguide resonant slit array circular polarization antenna relates to a circular polarization antenna used in wireless communication fields such as satellite communication, electronic reconnaissance and countermeasure and radar. The circular polarization antenna comprises a microstrip adapter (2) below the front surface of the antenna, and a directional coupler (3) with an input terminal (31) and an isolation terminal (34) connected with the upper portion of the microstrip adapter (2), wherein the input terminal and the isolation terminal (34) are connected with a straight through terminal (32) and a coupling terminal (33) through a middle coupling segment (35); the middle coupling segment (35) is used for adjusting the power distribution of the straight through terminal (32) and the coupling terminal (33); the upper portions of the straight through terminal (32) and the coupling terminal are respectively connected with two left and right symmetrical power dividers (4) with unequal crossed phases; the eight branches of the power dividers (4) are connected with eight radiation waveguides (5); and a first slit array (61) and a second slit array (62) symmetrical to each other and with orthogonal radiation fields are etched in the top metal layer of each branch waveguide at the top eight radiation waveguides.

The invention discloses a high-gain dual-frequency circularly polarized antenna based on a metasurface. The working frequency bands are a K wave band and a Ka wave band. A metal layer of the antenna comprises a micro-strip ring feeder line, a grounding plane with a cross slot and a metasurface. The micro-strip ring feeder line at the lowest position is coupled with the slotted grounding plane at the middle position. The electromagnetic wave energy is coupled to the metasurface of the uppermost layer and is radiated out. The sequential rotation structure of the micro-strip ring feeder line cangenerate a phase difference of 90 degrees so as to excite circular polarization. According to the feed structure, a wide axial ratio bandwidth can be realized; the metasurface can influence the axialratio bandwidth and gain of high and low frequency bands; the gain of the antenna in two frequency bands is greater than 5dBic; and the single-port feed dual-frequency circularly polarized antenna hasgood radiation characteristics in two frequency band bands, and is compact in structure and easy to process, so that antenna has a good application prospect in a wireless communication system.

The invention discloses a broadband circularly polarized millimeter wave multi-feed multi-beam lens antenna. The antenna comprises a multi-port broadband circularly polarized planar feed antenna array(1) and a planar lens (2); a plane of the multi-port broadband circularly polarized planar feed antenna array (1) and a plane of the planar lens (2) are arranged in parallel; and a signal of the multi-port broadband circularly polarized planar feed antenna array (1) is output or received through the planar lens (2). A plurality of focal points are distributed on the planar lens (2) in a phase-shifting mode, and the planar lens is formed by arranging completely identical anisotropic unit structures (5) in a periodic mode. Each anisotropic unit structure (5) is composed of an upper-layer metalpatch (5a), a middle-layer metal patch (5b) and a lower-layer metal patch (5c). The antenna can realize a multi-feed multi-beam characteristic and has a wide application prospect in the aspects of wireless communication and satellite communication.

The invention discloses a broadband circular polarization capsule antenna combining a plane and a flexible medium and is a capsule antenna which is applied to the internal of the human body and has a broadband circular polarization characteristic and is arranged inside an endoscope. The broadband circular polarization capsule antenna firstly adopts a single-layer circular Rogers medium substrate which has a diameter the same as that of a capsule and coaxial feeding is performed from a bottom; two metal bands are perpendicular to each other on the upper surface of the substrate, wherein one of the metal bands is connected to the ground through short circuit in a position close to the end of a capsule wall and a non-balance feeding mode is formed with the coaxial feeding; on the basis of that, two metal bands on the upper surface of the substrate extend L-shaped branches to the capsule wall so as to achieve following effects: an antenna radiation caliber of the antenna is enlarged and radiation efficiency is increased. Furthermore, the broadband circular polarization capsule antenna of the invention does not occupy too much space inside the capsule while increasing current paths, can better realize miniaturization, forms two orthogonal modes in a needed frequency band and lays the groundwork for circular polarization performance.

The invention provides a millimeter wave omnidirectional circularly polarized antenna used for 5G communication. The millimeter wave omnidirectional circularly polarized antenna comprises a first dielectric plate and a second dielectric plate which are stacked up and down; at least four square parasitic patch units with annular gaps in one diagonal line are printed on the upper surface of the first dielectric plate to form a rotary symmetric structure, and the angles between the adjacent parasitic patch units are equal; a feed network and at least four square radiation patch units with disturbance branches on a pair of opposite corners are printed on the upper surface of the second dielectric plate, and a metal grounding plate is printed on the lower surface of the feed network; each output arm of the feed network comprises a section of tapered gradual change line; the radiation patch units are located under the parasitic patch units; and the diagonal line where the disturbance branches are located and the diagonal line wherein the annular gaps of the parasitic patch units are located are consistent in direction. According to the antenna, high omni-directional circular polarizationcharacteristics can be kept in a 5G communication at 28GHz working frequency band, and the power capacity of the antenna is improved while the D2D communication requirement is met.

The invention discloses a broadband polarization reconfigurable antenna based on a cross dipole and a parasitic unit. The antenna comprises a cross dipole radiation unit, a parasitic radiation unit, achip capacitor, a 3/4 feed square ring, an insulating support column, a coaxial feed line unit, a reflecting plate, a PIN diode switch, a microstrip line feed unit and a dielectric substrate; the cross dipole radiation unit, the parasitic radiation unit, the microstrip line feed unit, the embedded PIN diode switch and the chip capacitor are etched on the dielectric substrate. A basic unit of thecross dipole is a butterfly-shaped unit with two orthogonal arms, and the two arms of the butterfly-shaped unit are connected through the 3/4 feed square ring; slits are formed in the outer sides of the joints of the feed square ring and the arms; and the PIN diode switch is arranged between the microstrip line feed unit and the cross dipole unit. The antenna has the advantages of small size, light weight, simple structure, wide ultra-wideband and the like, and three working modes can be achieved by controlling on-off of the two PIN diode switches.

A wideband circular polarization directional antenna array based on a single double-face printing circuit plate comprises a dielectric substrate, a crossfeed network located on the front surface of the dielectric substrate, a grooved floor located on the reverse surface of the dielectric substrate, a reflecting plate located under the dielectric substrate and a nylon pillar connecting the dielectric substrate and the reflecting plate. Four unit groove antennas are etched in the grooved floor, each unit groove antenna is composed of an annular groove and two square grooves separately by 90 degrees, and four square grooves are further etched in the edges of the grooved floor to improve the gain characteristic of the array. A microstrip line of the tail end of the crossfeed network crosses the two square grooves of each unit groove antenna on the grooved floor, thereby exciting the unit groove antennas. Unit circular polarization is achieved through two orthogonal modes of the annular groove antennas and a feed method with the phase difference of 90 degrees, and a 2*2 antenna array is achieved through the crossfeed network. The wideband circular polarization directional antenna array based on the single double-face printing circuit plate can cover a wider frequency band, and meanwhile is simple in structure, low in cost, capable of being formed at one time and good in process consistency.

The invention discloses a circularly polarized antenna array with a sequentially rotated feed network, belonging to the technical field of antennas. The circularly polarized antenna array comprises adielectric substrate, wherein the front surface of the dielectric substrate is provided with four antenna units; each antenna unit comprises a patch; an elliptical groove is formed in each patch; eachantenna unit is allowed to cover frequency band ranges of different impedance bandwidths and axial ratio bandwidths by changing the size of the patch of the unit, the sizes of a long axis and a shortaxis of the elliptical groove and an included angle between the long axis of the elliptical groove and one side edge of the patch; the antenna units are connected to the sequentially rotated feed network; the sequentially rotated feed network is connected to a ground plane; and the ground plane is located on the back surface of the dielectric substrate. Since the antenna units working in different frequency bands are connected with the sequentially rotated feed network to form an antenna array, so a circularly polarized array antenna with a small size, low profile, and wide impedance bandwidth and axial ratio bandwidth is obtained.

The invention discloses a planar microstrip patch antenna with broadband end-fire circular polarization characteristics. The antenna comprises a single-layer dielectric substrate, an upper metal patchand a lower metal patch, wherein the single-layer dielectric substrate comprises a bent metal wall, a coaxial feed probe and a loading metal probe which are arranged sequentially; the coaxial feed probe is used to feed the energy of the antenna; the bent metal wall is used as a reflection cavity; the loading metal probe is used for adjusting the impedance matching performance of the antenna; theupper metal patch and the lower metal patch sequentially comprise rectangular patches, arc-shaped gradient slot apertures, feed strips and fan-shaped dipole patches from one side to the other side; the arc-shaped gradient slot aperture is used for exciting a vertical polarization component; the feed strip is used for transferring the energy to the fan-shaped dipole patch; and a horizontal polarization component is excited by the fan-shaped dipole patch. The broadband circular polarization radiation function of the planar microstrip patch antenna is realized, and the planar microstrip patch antenna has the advantages of simple structure and wide common bandwidth of impedance and axial ratio.

The invention provides a circularly polarized antenna comprising a linearly polarized antenna source, a circularly polarized lens and a medium lens, wherein the linearly polarized antenna source is used for radiating linearly polarized waves; the circularly polarized lens includes a circular polarization device which is located above the linearly polarized antenna source and used for converting the linearly polarized waves into circularly polarized waves, the circular polarization device comprises a plurality of dielectric grids which are vertically and parallelly arranged, the plurality of dielectric grids are arranged in sequence along the horizontal direction at equal intervals; and the medium lens is connected above the circular polarization device and is used for refracting and converging the circularly polarized waves. The antenna can be used for 5G mobile communication, so that the wider axial ratio bandwidth is achieved, meanwhile, the gain of the antenna is improved, moreover,the wave beam scanning of the antenna is realized, and the antenna is suitable for the scene of mobile communication such as the fifth generation in the future.

The invention discloses a broadband circularly-polarized antenna. The antenna comprises an upper-layer dielectric plate and a lower-layer dielectric plate, wherein the upper-layer dielectric plate andthe lower-layer dielectric plate are connected through four metal columns, the lower surface of the upper-layer dielectric plate comprises four strip feeders, and the upper surface of the upper-layerdielectric plate comprises an annular patch; and a feed port is arranged at one end of each strip feeder, the four feed ports feed the four strip feeders through the four metal columns respectively,the four strip feeders couple electromagnetic wave energy to the annular patch, and the annular patch radiates the electromagnetic wave energy. According to the broadband circularly-polarized antenna,coupling feeding is performed on the annular patch of the antenna through the four strip feeders, impedance bandwidth and axial ratio bandwidth of the circularly-polarized antenna are increased, andthe circularly-polarized antenna has good broadband characteristics and circular polarization characteristics.

The invention discloses a slot-coupled circularly-polarized micro-strip antenna. The slot-coupled circularly-polarized micro-strip antenna comprises a radiation paster layer medium plate, a feed network layer medium plate and a reflection aluminum plate which are arranged from up to down. The radiation paster layer medium plate is formed in such a manner that a radiation paster is applied to the side of an insulating medium plate. The feed network medium plate is formed in such a manner that a copper film layer is applied to the side of the insulating medium plate. Two coupled slots are formed in the copper film layer in an etching manner. A circularly-polarized feed network is applied to the other side of the insulating medium plate. The coupled slots are in a concave shape, the two concave-shaped coupled slots intersect on only one corner point, and the two coupled slots are perpendicular to each other and symmetrical. Both concave ports of the two concave-shaped coupled slots face the external part of the space commonly covered by the two concave-shaped coupled slots. The slot-coupled circularly-polarized micro-strip antenna is different from a conventional straight slot design, bent parts of the concave slots are capable of realizing tuning of an antenna standing wave curve, and the two concave slots are arranged in a perpendicular and symmetrical manner, so that two electromagnetic waves which are orthogonal in polarity and identical in amplitude are guaranteed to be excited.

A circularly polarized antenna exhibiting a high performance characteristic can be produced by utilizing a ground plane, a half-loop, and an electric dipole in a predetermined configuration. The circularly polarized antenna can provide benefits, such as wide axial ratio bandwidth, high gain, and simple structure, over other unidirectional circularly polarized antennas.

A GNSS choking coil antenna based on a wave absorbing material is disclosed. The antenna comprises a multipath suppression plate, a plurality of first wave-absorbing units, an antenna unit, a plurality of second wave-absorbing units and a plurality of third wave-absorbing units. The plurality of first wave-absorbing units are annularly arranged along a center of the multipath suppression plate andare vertically arranged on an upper surface of the multipath suppression plate. The antenna unit is arranged on the upper surface of the multipath suppression plate and is located in a ring formed byarranging the plurality of first wave-absorbing units. The plurality of second wave-absorbing units are annularly arranged along the center of the multipath suppression plate and are obliquely arranged on the upper surface of the multipath suppression plate. The plurality of third wave-absorbing units are annularly arranged along the center of the multipath suppression plate and are arranged on an outer peripheral surface of the multipath suppression plate, and the plurality of third wave-absorbing units are vertical to the plurality of first wave-absorbing units. By using the GNSS choking coil antenna of the invention, most of multipath signals can be absorbed, most of surface waves formed on the outer peripheral surface of the multipath suppression plate can be absorbed, an interferenceof the surface waves is reduced, and a multipath suppression capability of the antenna is effectively improved.

The invention discloses a broadband electromagnetic dipole circularly polarized antenna, and the antenna comprises an electric dipole, a magnetic dipole, an inverted L-shaped feed sheet, a metal wall,a floor and a coaxial connector; the electric dipole consists of a pair of metal sheets parallel to the floor, and the magnetic dipole consists of a pair of metal sheets which are vertical to the floor and are short-circuited with the floor; the electric dipoles are arranged on the magnetic dipoles and are in central symmetry about the center of the floor; the inverted L-shaped feed sheet is arranged on the floor, is connected with an inner conductor of the coaxial connector arranged on the back surface of the floor and is used for coupling and feeding the electric dipole and the magnetic dipole, and the metal walls are arranged in the centers of four sides of the floor. The broadband electromagnetic dipole circularly polarized antenna has better broadband performance, and is convenient to process and good in mechanical stability.

The invention discloses a broadband circularly polarized planar antenna array applied to a millimeter wave communication system, which comprises an antenna body and a feed network, and is characterized in that the antenna body is formed by equidistantly arranging a plurality of antenna units in a two-dimensional direction; the antenna unit sequentially comprises a circularly polarized radiator, a first dielectric substrate, a bonding layer, a metal ground, a second dielectric substrate and a microstrip feeder from top to bottom; the circularly polarized radiator is connected with the metal ground through four metal holes penetrating through the first dielectric substrate and the bonding layer; the circularly polarized radiator comprises two pairs of orthogonal dipoles and is connected with the metal ground through four metal holes penetrating through the first dielectric substrate and the bonding layer; each pair of dipoles comprises two monopoles which are symmetrical around the center; the two pairs of dipoles are different in size, and the design enables the currents of the two pairs of orthogonal dipoles to show a 90-degree phase difference, thereby generating circular polarization radiation. The circular polarization performance is improved by loading a thin strip-shaped branch knot on a long dipole arm.

The invention discloses a low-coupling dual-frequency dual-radiation pattern antenna, the antenna comprises a first dielectric plate, a second dielectric plate and a metal grounding plate, the first dielectric plate is composed of a first substrate, an octagonal patch and a parasitic patch, the octagonal patch and the parasitic patch are placed on the upper surface of the first substrate, and the octagonal patch is provided with a gap; the second dielectric plate is composed of a second substrate and a circular patch, the circular patch is placed on the upper surface of the second substrate, and an annular gap is formed in the circular patch. The metal grounding plate is connected with the first dielectric plate through the first probe and is connected with the second dielectric plate through the second probe. The antenna with the circular polarization normal radiation characteristic and the antenna with the linear polarization conical radiation performance are integrated under the same aperture, the space occupied by the antenna is greatly reduced, and the dual-band, dual-polarization and dual-radiation directional diagram characteristics of the antenna are achieved.