45results about How to "Improve axle ratio" patented technology

The present invention provides a dielectric resonator antenna comprising: a dielectric resonator; a ground plane, operatively coupled with the dielectric resonator, the ground plane having four slots; and a substrate, operatively coupled to the ground plane, having a feeding network consisting of four microstrip lines; wherein the four slots are constructed and geometrically arranged to ensure proper circular polarization and coupling to the dielectric resonator; and wherein the antenna feeding network combines the four microstrip lines with a 90 degree phase difference to generate circular polarization over a wide frequency band.

A circularly-polarized-wave patch antenna includes a main body having a patch electrode provided with two feeding points and a circuit for generating a phase difference of 90° between signals supplied to the feeding points. A Wilkinson distribution circuit is provided between the 90°-phase-difference generating circuit and a coaxial cable (feeder line) so as to improve a reflection characteristic. The patch antenna includes two feeding points, and thus a favorable axial ratio characteristic can be obtained in a wide band. Also, a favorable reflection characteristic can be obtained in a wide band because of the Wilkinson distribution circuit. Accordingly, the patch antenna can be used in a wider frequency band.

The present invention provides a dielectric resonator antenna comprising: a dielectric resonator; a ground plane, operatively coupled with the dielectric resonator, the ground plane having four slots; and a substrate, operatively coupled to the ground plane, having a feeding network consisting of four microstrip lines; wherein the four slots are constructed and geometrically arranged to ensure proper circular polarization and coupling to the dielectric resonator; and wherein the antenna feeding network combines the four microstrip lines with a 90 degree phase difference to generate circular polarization over a wide frequency band.

The invention discloses a millimeter-wave four-polarized frequency scanning antenna, and relates to a multi-polarized frequency scanning antenna capable of being applied in fields such as millimeter-wave wireless communication system, radar detection and the like. An upper-layer metal copper-clad surface (1) and a lower-layer metal copper-clad surface (2) of the antenna are positioned on a front side and a back side of a dielectric substrate (3) respectively; and a metalized through hole (4) pass through the dielectric substrate (3) and is connected with the upper-layer metal copper-clad surface (1) and the lower-layer metal copper-clad surface (2) to form a substrate integrated waveguide 90 DEG directional coupler (5), a substrate integrated waveguide 16-groove 45 DEG slot leaky-wave antenna (6), a first clearance channel (61), a substrate integrated waveguide 16-groove -45 DEG slot leaky-wave antenna (7), and a second clearance channel (71). The whole antenna adopts substrate integrated waveguide for design, can be directly integrated with a radio-frequency circuit, and has the characteristics of low consumption, low cost, easy mass production and the like.

First and second monopole conductive elements are disposed so as to be approximately mutually perpendicular and so that respective open ends are adjacent, and with respect to a straight line that passes between open ends of the first and second monopole conductive elements and through a center of a conductive ground plane, a first conductive ground plane portion formed on a first monopole conductive element-side of the straight line among the conductive ground plane and the first monopole conductive element are formed so as to be approximately symmetrical to a second conductive ground plane portion formed on a second monopole conductive element-side of the straight line among the conductive ground plane and the second monopole conductive element.

A tri-band satellite navigation antenna for a COMPASS, a GPS and a GLONASS comprises three layers of micro-strip antenna bodies, feed coaxial probes, metal clamp plates, strip line mediums, feed networks and a set of metal screws. High-dielectric-constant ceramic mediums are adopted in all the mediums of the three layers of micro-strip antenna bodies so as to reduce the size of the antenna. Circular polarization of the first-layer micro-strip antenna body is realized through the methods of single-point feed and angle cutting on a metal patch, and circular polarization of the second-layer micro-strip antenna body and circular polarization of the third-layer micro-strip antenna body are realized through double-point feed. The number of the feed probes contained in the medium of each layer of micro-strip antenna body is not more than two, so that three ports have better electromagnetic isolation. The set of metal screws is arranged around the micro-strip antenna bodies, the metal screws can be used for fixing the metal clamping plates and strip line feed layers, and the metal screws can also expand the lobe width of the antenna. The tri-band three-port antenna has the advantages of being small in size, low in section, wide in lobe, good in low elevation angle gain and axial ratio and high in port insulation degree, and suiting to be used as a satellite navigation terminal receiving antenna.

A polarization switching / variable directivity antenna according to the present invention includes a radiation conductor plate 12 on a front face, and a ground conductor plate 14 on a rear face, of a dielectric substrate 11. At least one directivity switching element and at least two polarization switching elements are provided within the ground conductor plate 14 on the rear face. The directivity switching element includes a first slot which is formed by a removing a loop-like portion from the ground conductor plate 14 and at least two directivity switching switches (22a to 22d). Each polarization switching element includes a first slot which is formed by removing a loop-like portion from the ground conductor plate 14 and at least one polarization switching switch (23a to 23d). Switching of a maximum gain direction of radiation directivity of the antenna is realized through control of the directivity switching switches 22a to 22d, and switching of the rotation direction of a circularly polarized wave which is emitted from the antenna is realized through control of the polarization switching switches 23a to 23d.

The invention belongs to the technical field of antennas and provides an LTCC technology-based genome unit compact conformal array antenna. The invention mainly aims to solve the problem that the conventional circularly-polarized micro-strip patch array antennas fail to realize low profile, circular polarization, high gain and wide band at the same time. The antenna comprises a grounding metal layer, a lower layer dielectric substrate, a lower layer metal patch antenna, an upper dielectric substrate and an upper layer metal patch antenna, which are successively stacked from bottom to top; the lower layer metal patch antennal is formed from lower layer metal patch units in array arrangement; the upper layer metal patch antenna is formed from upper layer metal patch subarrays corresponding to the lower layer metal patch units; each upper layer metal patch subarray and the corresponding lower layer metal patch unit have coinciding centers and form a genome unit together. Under the limit of the same number of array numbers, the antenna is smaller in size, higher in gain, better in circular polarization performance and greater in frequency bandwidth, and is simple in structure and easy to process.

First and second monopole conductive elements are disposed so as to be approximately mutually perpendicular and so that respective open ends are adjacent, and with respect to a straight line that passes between open ends of the first and second monopole conductive elements and through a center of a conductive ground plane, a first conductive ground plane portion formed on a first monopole conductive element-side of the straight line among the conductive ground plane and the first monopole conductive element are formed so as to be approximately symmetrical to a second conductive ground plane portion formed on a second monopole conductive element-side of the straight line among the conductive ground plane and the second monopole conductive element.

The invention provides an all-metal four-arm equal-angle spiral circularly-polarized antenna. The all-metal four-arm equal-angle spiral circularly-polarized antenna comprises an all-metal equal-anglespiral-structure radiation arm, a metal reflecting cavity, a coaxial feeder and a cylindrical resonant cavity, wherein a single coaxial feeding probe perpendicular to ground is used as coaxial cable feeding and is connected with a central metal feeding round ring, parallel feeding is performed by a pair of upper dipole arms of the metal feeding round ring in the radiation arm, a pair of lower dipole arms which are arranged in parallel are connected with grounding ends coaxial to each other, so that space positions of the four dipole arms and electromagnetic waves on the arms are in orthogonality to form a condition required by circular polarization. In order to solve the problem of unbalanced feeding of a coaxial line, the coaxial feeder is designed to be a coaxial taper balun structure, so that a load is matched with feeder impedance; in order to achieve the function of unidirectional radiation of the antenna, the metal radiation cavity is additionally formed in a back part of the antenna; and the all-metal four-arm equal-angle spiral circularly-polarized antenna has the characteristics of wide frequency band, small size, high gain and the like, can be embedded and is applicable to the field of a modern communication system and electronic countermeasures.

The invention discloses a circularly-polarized cross dipole GPS navigation antenna. The antenna comprises an upper dielectric substrate, a lower dielectric substrate, an intermediate dielectric substrate, a radiation unit, a parasitic unit and a feed unit, wherein the upper dielectric substrate and the lower dielectric substrate are arranged in parallel; the intermediate dielectric substrate is arranged between the upper dielectric substrate and the lower dielectric substrate and is perpendicular to the upper dielectric substrate and the lower dielectric substrate; and a reflecting plate is arranged on the lower surface of the lower dielectric substrate. The antenna is small in size, is large in bandwidth, is wide in beam, and can be well applied to GPS satellite navigation terminal devices.

A polarization switching / variable directivity antenna according to the present invention includes a ground conductor plate 12 on a surface of a dielectric substrate 11, and has a radiation element 13, a directivity switching element 15, and polarization switching elements 16 provided on the ground conductor plate 12 side of the dielectric substrate 11. The radiation element 13 includes a first slot 17a formed by removing a loop-like portion from the ground conductor plate 12. The directivity switching element 15 includes a second slot 17b formed by removing a loop-like portion from the ground conductor plate 12 and directivity switching switches 18. The polarization switching elements 16 includes a third slot 17c formed by removing a linear-shaped portion from the ground conductor plate 12 and polarization switching switches 19a to 19d. Through control of the directivity switching switches 18, switching of a maximum gain direction of radiation directivity of the antenna is realized. Through control of the polarization switching switches 19a to 19d, switching of a rotation direction of a circularly polarized wave which is emitted from the antenna can be realized.

The invention discloses a two-dimensional millimeter wave circularly-polarized wide-angle scanning phased-array antenna, and relates to the technical field of millimeter wave antennas. According to the technical scheme, an antenna radiation patch is connected with a rectangular parasitic patch through a high impedance matching microstrip line which is provided with a cross-carved equal length in the center and is used for carrying out impedance matching on the antenna, and a windmill-shaped microstrip radiation patch excitation equal-amplitude in-phase polarization orthogonal degenerate mode is manufactured on the symmetric center of a diagonal bisector of the corner of the antenna radiation patch; feed probes penetrate through the antenna dielectric layer and are connected with the antenna radiation patch through the four rectangular parasitic patches, the four feed probes 4 of each antenna unit feed through rotary feed structures which are equal in amplitude and sequentially differ by 90 degrees, and the windmill-shaped microstrip radiation patch is connected with rectangular blocks of the four rectangular parasitic patches of the four metallized probes for feed. feeding in equal-amplitude excitation with the phase difference of 90 degrees is performed in sequence to form circular polarization radiation, and the antenna arrays are arranged in a rectangular manner at equal intervals according to unit intervals to form an antenna array surface.

The invention discloses a dual-frequency three-polarization MIMO antenna and a wireless communication device, the antenna includes a dielectric substrate, a floor, three feeder wires and two radiationpatches, the floor is arranged on the upper surface of the dielectric substrate, and a dumbbell-shaped gap is etched on the floor, the dumbbell-shaped gap has a long slit and two grooves connected toboth ends of the long slit, The three feeder lines and two radiation patches are arranged on the lower surface of the dielectric substrate, wherein one feeder line corresponds to the long slit of thedumbbell-shaped slot, and the other two feeder lines, two radiation patches and two grooves of the dumbbell-shaped slot are in one-to-one correspondence, each radiation patch is connected with a corresponding feeder line; The wireless communication device includes an antenna as described above. The antenna of the invention has dual-frequency and three polarization characteristics, and is easy toprocess, simple in structure, low in cost and wide in frequency bandwidth. The linear polarization can be applied to Bluetooth of 1.98 GHz to 2.9 GHz, Wi-MAX, ISM and other communication frequency bands, and circular polarization can be applied to the Wi-MAX of 3.13 GHz to 4.53 GHz, 5G and other communication bands.

The invention brings forward an anti-interference microstrip array antenna, and is especially applied to a Beidou third-generation satellite navigation system. The anti-interference microstrip array antenna employs elliptical microstrip antenna array elements so as to enable mutual coupling between the array elements to be quite low and effectively improve the anti-interference capability of the array antenna. Compared to a conventional rectangular microstrip array antenna, the bandwidth of the anti-interference microstrip array antenna is improved by more than one time, and the requirement of a Beidou third-generation BOC modulation mode can be completely satisfied. The anti-interference microstrip array antenna comprises the N microstrip antenna array elements, a medium substrate and a metal reflection base plate, wherein the microstrip antenna array elements are arranged at the upper surface of the medium substrate according to certain intervals, and the metal reflection base plate is arranged at the lower surface of the medium substrate; and the microstrip antenna array elements are elliptically-shaped for radiating circular polarized waves, and the microstrip antenna array elements are provided with a coaxial feed point for feeding into electromagnetic wave signals.

A polarization switching / variable directivity antenna according to the present invention includes a ground conductor plate 12 on a surface of a dielectric substrate 11, and has a radiation element 13, a directivity switching element 15, and polarization switching elements 16 provided on the ground conductor plate 12 side of the dielectric substrate 11. The radiation element 13 includes a first slot 17a formed by removing a loop-like portion from the ground conductor plate 12. The directivity switching element 15 includes a second slot 17b formed by removing a loop-like portion from the ground conductor plate 12 and directivity switching switches 18. The polarization switching elements 16 includes a third slot 17c formed by removing a linear-shaped portion from the ground conductor plate 12 and polarization switching switches 19a to 19d. Through control of the directivity switching switches 18, switching of a maximum gain direction of radiation directivity of the antenna is realized. Through control of the polarization switching switches 19a to 19d, switching of a rotation direction of a circularly polarized wave which is emitted from the antenna can be realized.

The present invention relates to a circularly polarized antenna which is applicable to small-sized communication modules and terminals to have a subminiature and ultralight antenna using a coaxial connector and a serial power distributor, including: an upper printed circuit board having a plurality of horizontal monopole radiation elements which are arranged at a constant interval; a lower printed circuit board having a feed network which is provided at a constant interval from the upper printed circuit board to face the upper printed circuit board; and a plurality of coaxial connectors which electrically connect each horizontal monopole radiation element of the upper printed circuit board with the feed network of the lower printed circuit board.

The invention discloses a one-emission-two-receiving circularly-polarized integrated antenna. The one-emission-two-receiving circularly-polarized integrated antenna comprises a circularly-polarized patch antenna unit and a printed circuit board, wherein the circularly-polarized patch antenna unit and a feeding structure are integrated onto the printed circuit board, the circularly-polarized patchantenna comprises a microstrip plate, an antenna radiator and a metal post probe, the antenna radiator is arranged on an upper surface of the microstrip plate, the metal post probe vertically penetrates through the microstrip plate and the printed circuit board, two ends of the metal post probe are respectively connected with the antenna radiator on the upper surface of the microstrip plate and amicrostrip line on a lower surface of the printed circuit board, and a plurality of electromagnetic bandgap structure units are arranged at an outer side of the antenna radiator and are annularly distributed. By the one-emission-two-receiving circularly-polarized integrated antenna, the isolation between the antenna units can be effectively, the directional diagram, the shaft ratio and the gain performance of the antenna units are improved, and the integration of the antenna and a circuit and a component on the printed circuit board is facilitated.

The invention provides a transmitting-receiving common-aperture wide-angular-domain scanning satellite communication antenna array and an aircraft with the same. The antenna array comprises a metal bottom plate, a plurality of antenna units, and a plurality of metal columns, wherein an arbitrary antenna unit comprises five microwave dielectric plates, a transmitting radiation patch, a receiving radiation patch, a coupling feed patch, a feed network, a metal probe and a feed connector which are sequentially arranged from top to bottom, the feed network is a 3dB bridge feed network, and the feed network is arranged on the lower surface of the fourth microwave dielectric plate; the fourth microwave dielectric plate has a plurality of first metalized via holes, the fifth microwave dielectric plate has a plurality of second metalized via holes, and the plurality of first metalized via holes and the plurality of second metalized via holes are located around the feed network; and a plurality of metal columns are arranged on the outer sides of the plurality of antenna units. By applying the transmitting-receiving common-aperture wide-angular-domain scanning satellite communication antenna array and the aircraft of the invention, the technical problems that the satellite communication small-frequency-ratio transceiving common-caliber design cannot be realized and the gain is slowly reduced during large-angle scanning in the prior art are solved.

The invention provides a satellite navigation antenna which comprises a first printed symmetrical dipole circuit board and a second printed symmetrical dipole circuit board. Two printed symmetrical dipole circuit boards are orthogonally arranged on a grounding plane printed circuit board to form an orthogonal polarization antenna. The bottom layer of each printed symmetrical dipole circuit boardsis a downdip symmetrical dipole, and the top layer is a microstrip balun. The top layer of the grounding plane printed circuit board is a grounding plane, and the bottom layer is provided with an antenna feed network. The satellite navigation antenna uses the printed symmetrical dipoles as antenna radiation units, and has the advantages of light weight and low cost.

The invention provides a vehicle-mounted built-in dual-band dual-circularly-polarized mixed dielectric resonator antenna. The antenna comprises a dielectric resonator, a dielectric substrate, a metal ground plane and a microstrip line, the microstrip line is arranged in the center of the bottom of the dielectric substrate, the metal ground plane is arranged on the surface of the dielectric substrate, and a gap is formed in the center of the metal ground plane and is perpendicular to the bottom microstrip line. The dielectric resonator is arranged right above the gap; the dielectric resonator comprises a prismoid, a mixing cylinder is arranged on the upper portion of the prismoid, the mixing cylinder is a hollow cylinder, liquid is arranged in the hollow cylinder, and the cylinder of the hollow cylinder is a metal dielectric medium. Triangular prism-shaped notches are formed in opposite angles of the upper part and the lower part of the prismoid; double frequency bands are obtained through slot coupling feeding, a basic mode and a high-order mode, the hybrid antenna is realized by adding liquid into a hollow hollow cylindrical part, the high-frequency bandwidth is expanded, the low frequency is hardly influenced, the gain of the antenna is improved after water is added, and the gain is increased when the water is increased at high frequency.

The invention relates to the technical field of wireless communication, in particular to a broadband miniature antenna for 5G mobile communication. The broadband miniature antenna comprises a metal patch, a planar equiangular spiral structure antenna array element, a broadband balun, a trapezoidal horn, a circular ring and reflection ground, wherein the outer wall of the trapezoidal horn, the inner wall of the circular ring and the reflection ground form a special-shaped reflection cavity. A novel antenna structure is provided for a 5G low-frequency band (below 6GHz); the circularly polarized broadband miniature antenna is designed by loading the circular metal patch, designing the unique special-shaped reflection cavity and the like; the dimension is simple and compact; and the broadband miniature antenna has good impedance and radiation characteristics within a 3GHz-6GHz working frequency band and can meet the requirements of a 5G large-scale MIMO antenna array.

A microstrip antenna has two feed points. The microstrip antenna includes a feeder circuit which is configured to feed, to the two feed points, electric signals whose phases are different by 90° from each other. The feeder circuit includes a Wilkinson coupler unit and a phase-shift unit each of which is formed as a lumped constant circuit.

The invention discloses a wide-beam frequency-reconfigurable printed four-arm spiral navigation antenna which comprises an independent lower spiral body, an independent upper spiral body and an independent parasitic oscillator. The upper spiral body comprises a second dielectric sheet, a second spiral arm printed on the second dielectric sheet, a second short circuit connecting arm printed on the second dielectric sheet and a second mechanical structure for supporting the second dielectric sheet; the lower spiral body comprises a first dielectric sheet, a first spiral arm printed on the first dielectric sheet, a first mechanical structure supporting the first dielectric sheet and a feed probe arranged on the bottom floor. The bottom floor is provided with four probes for feeding, feeding is carried out through the four probes at the bottom, and the circular polarization characteristic of the antenna is achieved by endowing four signals which are equal in amplitude and have the phase difference of 90 degrees in sequence. According to the invention, a single structure covers a global navigation frequency band and broadens a directional diagram wave beam, the gain at a low elevation angle is improved, the anti-interference capability is enhanced, and the antenna has the characteristic of miniaturization when being used as a single-frequency-band antenna.

The invention provides a satellite communication system and / or navigation system antenna. The satellite communication system and / or navigation system antenna comprises a reference ground metal plate,a system antenna, a first feeding point, and a metal diaphragm; the system antenna comprises an insulating dielectric layer and a system antenna radiator which are sequentially arranged on the upper surface of the reference ground metal plate, and the system antenna radiator is provided with a first symmetric surface and a second symmetric surface which are perpendicular to each other; the first feeding point is arranged on the system antenna radiator, and the system antenna radiator is enabled to radiate circularly polarized waves through feeding of the first feeding point; and the metal diaphragm and the system antenna are arranged at an interval, the absolute value of the included angle between the metal diaphragm and the first symmetric surface is 0-10 degrees, and at least part of thesystem antenna radiator is orthographically projected on the metal diaphragm. The antenna can effectively reduce the imbalance of the edge radiation intensity of the reference ground metal plate, weaken the coupling effect with surrounding metal substances, inhibit cross polarization components, and achieve the purpose of improving the antenna axial ratio and the radiation pattern of a satellitecommunication system and / or a navigation system.

The invention belongs to the technical field of antennas, and provides an LTCC double-layer single-feed circularly polarized microstrip patch array antenna unit to solve the problem of the existing circularly polarized microstrip patch array antenna taking into account its low profile, circular polarization, and high The contradiction between gain and broadband development; in the antenna unit of the present invention, the size of the upper radiating metal patch is different from that of the lower radiating metal patch, and the resonance frequency of the lower radiating metal patch is higher than the center frequency of the antenna unit and the resonant frequency of the upper radiating metal patch The point is lower than the center frequency of the antenna unit; the cut angle size of the lower radiation metal patch is larger than the cut angle size of the upper radiation metal patch, and the cut angle dimensions of the upper and lower radiation metal patches make the single-point feed square patch produce Two orthogonal degenerate modes with equal amplitudes form a 90° phase difference; the present invention better takes into account the low profile and circular pole of the microstrip patch antenna by using the upper and lower radiating metal patches with the same shape and different sizes. Optimized performance requirements, while greatly improving the frequency bandwidth of the antenna.

The invention discloses a millimeter-wave four-polarized frequency scanning antenna, and relates to a multi-polarized frequency scanning antenna capable of being applied in fields such as millimeter-wave wireless communication system, radar detection and the like. An upper-layer metal copper-clad surface (1) and a lower-layer metal copper-clad surface (2) of the antenna are positioned on a front side and a back side of a dielectric substrate (3) respectively; and a metalized through hole (4) pass through the dielectric substrate (3) and is connected with the upper-layer metal copper-clad surface (1) and the lower-layer metal copper-clad surface (2) to form a substrate integrated waveguide 90 DEG directional coupler (5), a substrate integrated waveguide 16-groove 45 DEG slot leaky-wave antenna (6), a first clearance channel (61), a substrate integrated waveguide 16-groove -45 DEG slot leaky-wave antenna (7), and a second clearance channel (71). The whole antenna adopts substrate integrated waveguide for design, can be directly integrated with a radio-frequency circuit, and has the characteristics of low consumption, low cost, easy mass production and the like.

The invention discloses a ring-loaded microstrip patch antenna, comprising a reflecting plate (1), a lower patch (2), an intermediate patch (3) and a ring-loaded upper patch (4), wherein a short-circuit metal column (6) with a hole in the middle serves as a support among the three patches and the reflecting plate (1); a cover plate (5) is superposed on the upper patch (4); a feeder of the upper patch (4) passes through the hole in the middle of the short-circuit metal column (6), is connected with an impedance matching segment (12) on the cover plate (5) and then is fed onto the intermediate patch (3); a feeding port (8) of the intermediate patch (3) and a feeding port (9) of the lower patch (2) are connected with the circle center of the patches by lines to form included angles of 90 degrees to feed in circularly polarized radiation waves with equal signal amplitude and phase difference of 90 degrees; and the edge (11) of the upper patch (4) turns downwards to form a ring similar to the bottle cap. The edge of the upper patch turns downwards and the antenna utilizes the ring loading technology, thus increasing the gain of the upper patch and lowering the sidelobe and back lobe level.