90results about How to "Achieve circular polarization" patented technology

The invention provides a low section compact dual-band dual-polarization common aperture microstrip antenna which is formed by two layers of double-face copper clad microwave dielectric plates. The needed double-frequency antenna array and Ku band antenna feed network are formed on the upper surface of the upper layer dielectric plate through etching process, and an L type coupling slot is arranged on a grounded plate at the lower surface of the upper layer dielectric plate. A Ka band antenna feed network is at the lower layer of the lower layer dielectric plate, and the antenna is subjected to coupled feeding through the slot. Two frequencies of the antenna coverage are a Ka band and a Ku band. According to the antenna, through the reasonable array layout, a Ka band antenna and a Ku band antenna are in coplanar nested placement in a same aperture, the structure is compact, the feed network of the antenna is hierarchically designed, and the wiring space is relatively abundant. The antenna can be applied to a satellite communication terminal of Ku and Ka bands.

The invention relates to a circular polarization waveguide standing-wave antenna which solves the problems of low efficiency, wave beam orientation changed along with the frequency and the like of the prior circular polarization waveguide gap traveling-wave antenna. Both sides of the center line of the longitudinal wide edge of a feed waveguide tube with a rectangular cross section are evenly distributed and provided with more than two coupling gaps in a staggered way, and the middle part of the wide edge at one side of the feed waveguide tube is provided with a coaxial connector; both ends of the feed waveguide tube are sealed, a four-ridge metal ridge radiation waveguide is arranged at the coupling gaps at the wide edge of the feed waveguide tube, and the diagonal line of the opening face of the four-ridge metal ridge radiation waveguide and the coupling gaps are on the same straight line. The invention can realize that energy enters a waveguide cavity and is completely radiated out, and the radiation efficiency of the antenna is greatly enhanced; the problem of inconsistent orientation of wave beams with different working frequencies of the waveguide traveling-wave antenna is solved, and the tracking of the antenna to a satellite is easy.

The invention discloses a millimetre wave planar antenna and an array thereof, wherein the millimetre wave planar antenna includes a metal patch, a medium substrate, a metal floor board and ground poles, the metal patch is placed on an upper surface of the medium substrate, and a lower surface of the medium substrate is fixed with an upper surface of the metal floor board; the metal patch is parallel to the upper surface of the metal floor board; the metal patch is provided with at least one pair of same first bar-shaped channels, each pair of first bar-shaped channels are distributed in bilateral symmetry form, symmetrical centre lines of each pair of bar-shaped channels are superposed, a centre line in a length direction of each first bar-shaped channel is parallel to each other, and length of each first bar-shaped channel is 1 / 2 of an operating wavelength; the ground poles vertically penetrate through the medium substrate, the ground poles are circularly distributed at intervals at the periphery of a region where the first bar-shaped channels are distributed, and two ends of each ground pole are respectively contacted with the metal patch and the metal floor board. The invention can reduce loss of a millimetre wave antenna, improve radiation efficiency of the millimetre wave antenna, simultaneously, guarantee work bandwidth of the antenna, and improve antenna gain.

The invention aims at overcoming the defects of an existing micro-strip patch antenna in the aspects of the high gain, the wide band and the circular polarization and providing a laminated circular polarization micro-strip patch antenna based on the LTCC technology. The antenna comprises an upper radiation metal patch antenna array layer, a lower radiation metal patch antenna array layer, an upper dielectric substrate layer, a lower dielectric substrate layer, a feed network, a grounding metal layer and a coaxial connector probe. The antenna is characterized in that the upper radiation metal patch antenna array layer and the lower radiation metal patch antenna array layer are the same in shape and size, each antenna array is composed of four small antenna arrays, each small antenna array is composed of four sub-arrays, each sub-array is composed of four radiation metal patches, each radiation metal patch is a square with a chamfer, and a set of opposite sides of each radiation metal patch are provided with rectangular gaps. The antenna can better meet the requirements for performance of the high gain, the wide band and the circular polarization of the micro-strip patch antenna, and the structure is simple.

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 discloses a dielectric-loaded quadrifilar helix antenna with omnidirectional, circular polarization, and high gain performances. The antenna comprises a feed network and a radiation main body. According to the invention, a radio frequency signal of the feed network is transmitted to a first metal column 3 through an internal conductor 1 of a radio frequency coaxial cable and is transmitted to a second metal column 4, a third metal column 5 through an outer conductor 2; the first metal column 3 feeds power respectively to a first metal helix 9 and a second metal helix 10 on an outer surface of a dielectric cylinder 17 through a first metal tape 6, and the second metal column 4 feeds power to a third metal helix 11 on the outer surface of the dielectric cylinder 17 through a second metal tape 7; and the third metal column 5 feeds power to a fourth metal helix 12 on the outer surface of the dielectric cylinder 17 through a third metal tape 8, the line width of the first to the fourth metal helix 9-12 is gradually thicker from the end part to the tail part. According to the invention, a simple and compact structure is employed, and technical indexes of an antenna are ingeniously realized, wherein the indexes includes omnidirection, circular polarization, and high gain. Besides, the dielectric-loaded quadrifilar helix antenna has advantages of compact structure, small in size, light in weight, low cost, high efficiency, and good adaptability to environment; moreover, the antenna is easy to process and easy to tune.

The invention belongs to the technical field of microwaves and relates to a broadband circularly-polarized antenna for a handheld through-wall radar. The broadband circularly-polarized antenna sequentially comprises a radome 1, an upper patch layer 2, a PMI foam layer 3, a lower patch layer 4, a first dielectric layer 5, a coupling slot layer 6, a second dielectric layer 7, a feed microstrip 8 anda metal back cavity 9 from top to bottom, wherein a hollowed-out slot 61 is formed in the coupling slot layer 6; the shape of the feed microstrip 8 is a combined shape of a rectangle and a sector; and the metal back cavity 9 is a rectangular cavity with an open surface at one end and the open surface is toward the feed microstrip. According to the broadband circularly-polarized antenna, the technologies, such as slot-coupling feeding, a low-dielectric constant layer, laminated microstrip-coupled patches and a reflecting back cavity are comprehensively adopted, so that the antenna reaches theimpedance and beam bandwidth of over 30% under low profile requirements. The target of double-patch coupling resonance is achieved through tuning the transverse dimensions of upper and lower patches,and circular polarization is achieved by adopting the cutting angle design of the rectangular patches.

The invention realizes a tri-band wide wave beam circular polarization microstrip antenna, which comprises an antenna cover, wherein a feed network layer, a first medium layer, a first metal layer, a second metal layer, a second medium layer, a third metal layer, a fourth metal layer, a third medium layer, a fifth metal layer, a fourth medium layer and a sixth metal layer are sequentially stackedin the antenna cover from bottom to top and penetrated and fixed by short-circuit screws; the third metal layer is connected with the fourth metal layer; a first metallization through hole and a second metallization through hole are formed in the second medium layer and connected to the third metal layer; a Wilkinson 90-degree phase shift power divider and a four-branch 90-degree phase shift power divider are arranged on the feed network layer; a first feed needle and a second feed needle are arranged between the third metal layer and the feed network layer; and a third feed needle and a fourth feed needle are arranged between the sixth metal layer and the feed network layer.

The invention is concerned with a kind of multi-layer three-dimensional impending unilateralism and broad-band entelechy millimeter wave plane gap antenna, belonging to communication technology field, relating to circular metal gap inducting layer, microwave medium layer, entelechy gap radiation unit for coplanar wave-guide feeding, supporting layer and circular metal gap layer to cut off reflection of wave-guide. The circular metal gap inducting layer sets on a side of microwave medium layer, while entelechy gap radiation unit, circular metal gap layer and supporting layer are on the other side. The entelechy gap radiation unit for coplanar wave-guide feeding connects with microwave medium layer, and circular metal gap layer to cut off reflection of wave-guide connects with entelechy gap radiation unit for coplanar wave-guide feeding through the supporting layer. This invention is easy to adjust the size of coplanar wave-guide feeding to match with impedance and to prepare. It reaches the demand of entelechy and broad-band, unilateralism radiation and enhances plus of antenna remarkably.

The invention discloses a circularly polarized microstrip antenna, and mainly solves the problems that an existing satellite high speed communication antenna is narrow in frequency band, low in gain, and large in size. The circularly polarized microstrip antenna comprises a radiating unit (1), a dielectric lens (2), a support pillar (3), a parasitic patch layer (4), a patch layer (5), a floor layer (6) and a feed network layer (7). The radiating unit (1) is formed by the parasitic patch layer (4) and the patch layer (5), the floor layer (6) and the feed network layer (7) are adhered on the lower portion of the patch layer (5) in sequence, an orthometric double-fed feed unit is arranged at the back face of the feed network layer (7), and the feed unit extends to the right edge of the feed network layer (7)through feeder lines, and is welded with a sub-miniature-A (SMA) coaxial interface to carry out feed. The dielectric lens (2) is fixed above the parasitic patch layer (4) through the support pillar (3). The circularly polarized microstrip antenna has the advantages of being high in gain, wide in frequency band, small in structure, and capable of being used in various mobile communication base stations.

The invention discloses a circular polarization short backfire antenna with spiral feed source with higher broadband characteristic and smaller using volume from wireless communication antenna field, which comprises a master reflector (1), a sub-reflector (2), a feed source (3), as well as an assisting support (2); the feed source (3) comprises a helical antenna (31) and a feed point allocation device (32); the helical antenna (31) is coiled on the assisting support (2), one end is fixed with the assisting support (2), and the other end is connected with a signal output cable (5) through the feed point allocation device (32). Through adopting the helical antenna as the feed source of backfire antenna, the invention realizes the broadband and circular polarization of the antenna, meanwhile, the invention uses the helical wire to support and replace the special shaft, and to be connected with main parts of the antenna, thereby simplifying the antenna structure, reducing complexity of antenna processing technology, so as to benefit the mass production of the antenna.

The invention relates to a small circularly-polarized antenna comprising a feeding plate and four radiation oscillators mounted on one side face of the feeding plate. The feeding plate is provided with a feeding network, and the feeding network has four output ends which are respectively connected with the four radiation oscillators and used for generating four equal-power signals, of which the phase difference is 90 degrees, and respectively outputting the four signals to the four radiation oscillators. The radiation oscillators are PIFA oscillators, and low-loss insulating medium or gas of which the dielectric constant is greater than 2 is filled between horizontal portions of the radiation oscillators and the surface of the feeding plate. According to the small circularly-polarized antenna provided by the embodiment of the invention, by filling high-dielectric-constant low-loss insulating medium between the PIFA radiation oscillators and the feeding plate, the size of the antenna is greatly reduced, circular polarization is realized, and meanwhile, the cost of production is lowered. Compared with the prior art, the small circularly-polarized antenna of the invention has the advantages of small size, low profile, good circular polarization performance, high gain and the like.

The invention discloses a novel cylindrical surface luneberg lens antenna capable of realizing circular polarization or bi-circular polarization. The novel cylindrical surface luneberg lens antenna mainly comprises a linear polarization feed source antenna 1 which is attached to the circumferential surface of a cylindrical lens and of which the polarization direction is in a 45-degree angle to the axial direction of the lens (when bi-circular polarization is realized, the linear polarization feed source antenna 1 has to be changed into a bi-linear polarization feed source) , and a dielectric plate waveguide lens 2 which satisfies the required refractive index and allows horizontal polarization TE0 wave and vertical polarization TM0 wave to generate a rotary symmetric profile with a 90 degrees difference. The novel cylindrical surface luneberg lens antenna has a rotary symmetric structure, and is applicable to multi-beam scanning of an azimuth plane. An arc feed source array is only arranged on the circumference of the cylindrical dielectric plate waveguide lens, the distances between elements of the arc feed source array are adjusted according to the widths of the wave beams generated by a single feed source to realize uninterrupted wave beam scanning of the azimuth plane. The novel cylindrical surface luneberg lens antenna is simple in structure, and mature and stable in processing technology and is especially suitable for millimeter wave frequency range. Based on the basic structure of the novel cylindrical surface luneberg lens antenna, the linear polarization feed source types, the lens profile shape and antenna dimension are reasonably changed to from other embodiments of the invention.

The invention discloses a broadband quadruple-ridged waveguide circular polarizer and belongs to the technical field of satellite communication. The broadband quadruple-ridged waveguide circular polarizer comprises a square waveguide cavity, two vertical ridges and two horizontal ridges, wherein the two vertical ridges are respectively arranged the opposite waveguide walls, and the two horizontalridges are respectively arranged on the other two waveguide walls. The broadband quadruple-ridged waveguide circular polarizer disclosed by the invention utilizes the quadruple-ridged waveguide broadband characteristic, so that the heights and the widths of two pairs of orthogonal ridges are different, and propagation constants of two orthogonal polarization waves can be changed; according to theprinciple of the circular polarizer, when two polarization waves with the same amplitude and the same phase pass through the circular polarizer, the amplitudes of the two polarization waves are equal,phase difference is 90 degrees, and circular polarization is formed; meanwhile, no loading and phase shifting unit and no toothed groove structure are arranged on the ridges, so that the defect thatan existing circular polarizer cannot be applied to 1mm waveband is overcome; the broadband quadruple-ridged waveguide circular polarizer has the characteristics of application to L waveband to W waveband, wide work frequency band, excellent electric performance, simple structure, no debugging, high reliability and suitability for volume production.

The invention discloses a miniature broadband helical antenna. The miniature broadband helical antenna comprises a metal cavity (4), wherein the metal cavity (4) is comprehensively of a hollow tubular structure, a first wave absorption material layer (3) is arranged on the inner wall of the metal cavity (4), a feeding Balun (5) is arranged in the metal cavity (4), an antenna layer (1) is fixedly arranged on the upper end surface of the metal cavity (4), a metal rear cover (6) is fixedly arranged on the lower end surface of the metal cavity (4), a second wave absorption material layer (2) is arranged at the bottom of the antenna layer (1), the top of the feeding Balun (5) is provided with a feeding gap (11) in an upward extension way, the feeding gap (11) is in contact with a planar helical antenna (9), and a feeding connector (7) is arranged at the bottom of the feeding Balun (5). In the miniature broadband helical antenna, the planar helical antenna and the layered wave absorption material are used for forming a radiator, the layered wave absorption material is pasted on the inner wall of the metal cavity, and meanwhile, the design of broadband, circular polarization and miniaturization is achieved; and the reflection between the feeding Balun and the radiator is effectively reduced, and the standing wave characteristic of the antenna is improved.

The invention relates to the technical field of wireless communication, in particular to a broad band circular polarization plane gap quaternary antenna array which comprises a circular polarization gap radiation array and a microwave medium layer, wherein the circular polarization gap radiation array is arranged on the microwave medium layer. The circular polarization gap radiation array comprises four circular polarization gap radiation units and a plurality of feeders, wherein, every two circular polarization gap radiation units are connected in parallel by the feeders into a radiation branch, and two radiation branches are connected in parallel by the feeders into a radiation trunk path, and the circle centers of the four circular polarization gap radiation units are on the same axis. The invention has the characteristics of miniaturization, complanation and broad frequency band, and solves the problem that a plane gap antenna cannot be realized easily; in addition, the structure of antenna units are arranged in a 1*4 linear array, thereby improving gain and frequency band.

The invention discloses a BeiDou microstrip antenna loaded with wrench type resonant rings and relates to a microstrip antenna. The BeiDou microstrip antenna is provided with a medium substrate, upper and lower surface good conductor layers and a coaxial feed structure; the upper and the lower surface good conductor layers are respective coated at upper and lower surfaces of the medium substrate; the upper surface layer is a square patch which is arranged on the middle of the medium substrate; two wrench type resonant rings are symmetrically loaded at a pair of opposite angles of the square patch; each wrench type resonant ring consists of an isosceles-right-triangle-shaped cut corner, a rectangular gap and a circular ring notch groove; the vertex of the isosceles-right-triangle-shaped cut corner is superposed with the vertexes of the selected loading opposite angles; two right-angle sides of the isosceles-right-triangle-shaped cut corner are positioned on two sides, jacked out from the vertexes,. of the square patch; one short side of the rectangular gap is superposed with the inclined side of the isosceles-right-triangle-shaped cut corner; the other short side of the rectangular seam is a chord of the outer circle of the circular ring notch groove; the circle center of the circular ring notch groove is positioned in a position, on a diagonal line of the group of the selected loading opposite angles, of the square patch; and a coaxial inner conductor in the coaxial feed structure is connected with the square patch.

An antenna structure for the RFID Tag includes a carrier with an antenna attached to a surface thereof, the antenna being made of conductive material. The antenna is connected to an IC chip electronically. The antenna has a first and second radiating body connected to the IC chip separately. The first and second radiating body is connected to the IC chip and expanded in a coil until a proper length is reached. Thus, the first and second radiating body is spaced properly to construct a coiled antenna.

The invention discloses a dual-frequency dual-polarization Fabry-Perot resonant cavity antenna. The antenna comprises an upper dielectric substrate, a middle dielectric substrate and a lower dielectric substrate (2, 4 and 7) which are fixed into a whole through low-dielectric-constant nylon columns (10). The upper surface of the upper-layer dielectric substrate is provided with an upper partial reflection surface (1), and the upper-layer dielectric substrate and the partial upper reflection surface form an upper-layer partial reflection surface structure; a middle partial reflection surface (3) and a lower partial reflection surface (5) are respectively arranged above and below the middle dielectric substrate, and the middle partial reflection surface, the lower partial reflection surface and the middle dielectric substrate form a lower-layer partial reflection surface structure; and the bottom dielectric substrate comprises two layers of dielectric plates (71 and 72), a parasitic patch (8) is arranged between the two layers, a metal floor (6) is arranged on the lower surface of the first-layer dielectric plate, a parasitic rectangular patch array (9) is arranged on the upper surface of the second-layer dielectric plate, and the two dielectric plates, the parasitic patch, the metal floor and the parasitic rectangular patch array form a feed source structure. According to the invention, linear polarization and circular polarization can be realized at the same time, channel capacity is improved, signal attenuation is reduced, and the antenna can be used for astronomical detection and satellite communication systems.

The invention provides a notched jade ring type circular polarized antenna. The circular polarized antenna comprises an antenna unit and an earth plate, and is characterized in that the antenna unit conducts single feeding through a coaxial feeder; a sector is cut in the surface of the annular antenna unit; the center of the sector and the center of the antenna unit are at a same position; the radius of the sector is equal to the outer diameter of the antenna unit; air dielectric is arranged between the antenna unit and the earth plate. The circular polarized antenna has the advantages that the circular polarized antenna is simple in feeding manner, relatively low in influence of change of feeding point position to aerial performance, and relatively wide in band frequency.

The invention discloses a broadband and wide-angle dual-circular polarization spaceborne antenna. The antenna is composed of two linear polarization double-slot Vivaldi antennas which are arranged ina crossed manner; two conventional Vivaldi antennas arranged side by side are combined together so as to form the linear polarization double-slot Vivaldi antenna; conductors of the antenna which are located at the center positions of the double-slot antennas partially intersect with each other; two sides of a dielectric plate are printed with metal plates, so that one Vivaldi antenna can be formed; an exponentially-graded metal patch is adopted as a radiating unit of the Vivaldi antenna; uniformly-spaced rectangular grids are designed at the side wings of the exponentially-graded metal patch;the direct-through port and coupling port of a 3dB directional coupler are respectively connected with the terminal open-circuited microstrips of the two double-slot Vivaldi antennas which are arranged in a crossed manner through microstrip power dividers; and the phase difference of two paths of signals is 90 degrees, so that circular polarization can be achieved. The antenna of the present invention can achieve a broadband and wide-angle dual-circular polarization characteristic and has the advantages of small size and light weight; the antenna can be produced in a batched manner with a printed circuit technology; and the antenna can be integrated with an active device and a circuit, so that a single module can be formed.

The invention discloses a circularly-polarized broadband base station antenna. The circularly-polarized broadband base station antenna comprises an antenna radiation unit, a feed structure and a baffle board, wherein the antenna radiation unit is fixed to the baffle board through the feed structure, the feed structure is perpendicularly placed between the antenna radiation unit and the baffle board, and the antenna radiation unit comprises a main radiation ring, a spurious ring and a radiation unit dielectric substrate. Due to the facts that grooving is carried out at an appropriate position of an annular structure to achieve circular polarization, the spurious ring is used for strengthening the circularly-polarized bandwidth, and a high-impedance bandwidth is obtained through micro-strip and gap coupling feed, and the circularly-polarized broadband base station antenna is stable in radiation pattern, the gain can reach 9dBi, and the circularly-polarized broadband base station antenna is suitable for serving as an antenna of a mobile communication base station.

The invention discloses a circularly polarized wearable antenna based on a graphene flexible conductive film, and mainly solves the problems that an existing wearable antenna is excessively heavy anddifficult to circularly polarize. The circularly polarized wearable antenna comprises a radiation unit (1), a medium supporting layer (2) and an artificial magnetic conductor reflecting surface (3); the antenna is integrally arranged on the artificial magnetic conductor structure, so that backward radiation is isolated from a human body by an artificial magnetic conductor, and the safety of humantissues is ensured; the radiation unit is placed on the artificial magnetic conductor at an oblique angle of 45 degrees, so that electromagnetic waves of forward radiation and electromagnetic waves reflected by the artificial magnetic conductor act together to form a working mode of circular polarization of the antenna; and a flexible dielectric slab is used as a substrate of the radiation unit and the reflection surface of the artificial magnetic conductor, and the graphene conductive film is used as a conductor material of the radiation unit and the reflection surface of the artificial magnetic conductor, so that the flexible characteristics of the antenna are guaranteed, and the weight of the antenna is reduced. The wearable antenna can be used in a human body wireless communication system.

The invention belongs to the technical field of a microwave antenna and discloses a broadband high isolation double circularly polarized antenna based on a single layer artificial surface Plasmon. Theantenna includes a radiator, two vertically placed differential feed baluns and a metal reflector, wherein the radiator is located above the floor, upper ends of the two baluns are connected with theradiator, lower ends of the baluns penetrate through the metal floor and are connected with a feeding coaxial line, the radiator consists of four dipoles, two pairs of feeders and four parasitic metal rings, and the two pairs of feeders include a pair of coplanar strip lines and a pair of odd-mode artificial surface plasmon transmission lines. Full-wave electromagnetic simulation and processing tests are performed for the designed antenna, and that the antenna is capable of achieving broadband high isolation double circularly polarized radiation in the designed frequency band is verified. Theantenna is advantaged in that properties of high isolation, wide axial ratio bandwidth, high aperture efficiency and easy processing are achieved, and the application prospect is wide.

The invention discloses an antenna mechanism. Four first rectangular antennas, each two of which are mutually orthogonal to each other, are arranged on an antenna substrate. A phase-shifted feed network is arranged on the antenna substrate and is used for feeding power to the four monopole antennas, wherein the feeding phases are orthogonal to each other. According to the invention, with the fourfirst rectangular antennas arranged orthogonally, the circular polarization of the antenna is realized based on a feeding mode with the orthogonal feeding phases; and on the basis of the setting modeof all parts of the antenna mechanism, technical effects of miniaturization and high gain of the antenna mechanism are guaranteed.

The invention discloses a DNA simulation type frequency adjustable reconfigurable antenna which structurally comprises a ground plate, and further comprises a cylindrical dielectric plate fixed on the ground plate, and double helical metal conduction bands which are coaxially wound on the outer surface of the cylindrical dielectric plate at the same helical angle together with the cylindrical dielectric plate, wherein one of the double helical metal conduction bands is connected with the ground plate, and the other is connected with a feed circuit through a through hole on the ground plate; and the lumped element is arranged between the double helical metal conduction bands. According to the invention, the type and position of the lumped element can be changed to realize the high-gain reconfigurable antenna with two characteristics of wideband and work frequency point adjustability.

The invention discloses a Ka-frequency-band single-feed-point circularly polarized antenna which is characterized in that the antenna comprises three layers of structures which are sequentially arranged from top to bottom, double-layer dielectric substrates are further arranged among the three layers of structures, and the working bandwidth and the axial ratio bandwidth of the antenna are widened through the two layers of dielectric substrates; the first-layer structure comprises a parasitic patch and a decoupling frame, the radiation patch is arranged in the middle of the upper part of the upper-layer dielectric substrate and is used for expanding the working bandwidth of the antenna, and the decoupling frame is arranged at the periphery of the upper part of the upper-layer dielectric substrate and is used for preventing mutual interference among antenna units when the unit antennas form an array; the second-layer structure comprises a radiation patch, the radiation patch is arranged between the upper-layer dielectric substrate and the lower-layer dielectric substrate, the radiation patch is connected with a feed probe, and the feed probe is used for conducting electromagnetic waves to the radiation patch; and the third-layer structure comprises a floor which is arranged on the lower layer of the lower-layer dielectric substrate and used for reflecting electromagnetic waves.

The invention discloses a three-frequency circularly polarized antenna for a Beidou second-generation satellite navigation system, comprising a first dielectric substrate, a second dielectric substrate and a third dielectric substrate in order from top to bottom, wherein the first dielectric substrate, the second dielectric substrate and the third dielectric substrate are disposed in a stacked manner; the upper surface of the first dielectric substrate is provided with a first radiation patch, the upper surface of the second dielectric substrate is provided with a second radiation patch, the upper surface of the third dielectric substrate is provided with a third radiation patch, and the lower surface of the third dielectric substrate is provided with a floor. The invention has the advantages such as simple structure, low profile and good radiation characteristics on the basis of three-frequency circularly polarized characteristics.

The invention discloses a differential circularly polarized directional antenna, which comprises a dielectric substrate, a floor located at the lower part of the dielectric substrate, a first coaxialline and a second coaxial line, wherein the first coaxial line and the second coaxial line are parallel to each other; the dielectric substrate is provided with two 90-degree phase-shift patches and four radiation patches; the four radiation patches are sequentially arranged on the lower surface of the dielectric substrate around the center of the dielectric substrate and are in mirror symmetry; inner conductors at the upper ends of the first coaxial line and the second coaxial line are connected with the two 90-degree phase-shift patches separately and outer conductors are connected with tworadiation patches arranged at opposite angles separately; and the lower ends of the first coaxial line and the second coaxial line pass through the floor. The differential circularly polarized directional antenna is provided with two pairs of dipoles, has a circular polarization characteristic and a difference characteristic, has relatively large impedance bandwidth and axial ratio bandwidth and relatively large gain and can meet the requirements of an LTE mobile phone base station antenna applied to a broadband high-speed wireless communication system of 1.61-2.8GHz.

The invention provides an annular circularly-polarized implantable microstrip antenna used for a wireless body area network. The annular circularly-polarized implantable microstrip antenna comprises aradiation patch and a dielectric substrate, wherein the radiation patch is arranged on a front surface of the dielectric substrate and comprises an annular microstrip piece and a round metal piece, the round metal piece is arranged in the center of the annular microstrip piece, a pair of disturbance components are arranged on an inner boundary of the annular microstrip piece, a plurality of firstgrooves and a plurality of second grooves are formed in the annular microstrip piece, and a third groove is formed in the round metal piece. The annular circularly-polarized implantable microstrip antenna has a small antenna size and has an external profile suitably implanted in a human body, and data receiving and sending in the wireless body area network are more facilitated due to characteristic of circular polarization.