64results about How to "Low axle ratio" patented technology

The invention relates to a multifrequency patch antenna device, comprising a patch antenna, a printed circuit board (PCB), a shielding case and a low-noise amplifying circuit, wherein the patch antenna further consists of a patch antenna, a multi-frequency band feed network, a multi-frequency band feed probe and at least four feedback points; the at least four feedback points form at least two groups of feed points; one end of each of the at least two feed points is connected with the patch antenna, and the other end thereof respectively passes through the PCB via the multi-frequency band feed probe to be connected with the multi-frequency band feed network; and a shielding case is connected with the PCB. The invention improves the stability of antenna phase center, lowers axial ratio, and enables the matching to be much simpler and the antenna to become more compact. The device in the invention can receive multipath carrier at the same time, thus eliminating interference on an ionized layer and improving measurement precision.

The invention discloses a stable phase center measurement antenna which is mainly used in the fields of geodesy and relevant subjects including marine geodesy, geophysical exploration, resource exploration, engineering surveying, engineering deformation, spacecraft docking and the like. The antenna comprises a metal base of the antenna and wave-absorbing material arranged on the upper surface of the outer edge of the metal base. The center part of the metal base is a round cavity, and a circuit board protection cover, a multi-feed slot antenna array, a supporting medium, annular wave-absorbing material in the cavity, a coaxial feed antenna and a radio frequency connector are installed in the cavity from top to bottom. Two round groove choking coils are contained between the round cavity and the outer edge of the base. The multi-feed point, wave-absorbing material and coking coil technologies are comprehensively adopted for the stable phase center measurement antenna, and thus the stable phase center measurement antenna has the advantages of being low in wide angle polarization axis ratio and high in phase center stability and can be used for various kinds of precision measurement for satellite navigation.

The invention discloses a broadband circularly-polarized waveguide antenna and an antenna array thereof. The antenna comprises a radiation layer, a cavity layer, a feed network layer and a circularly-polarized network layer, wherein the radiation layer, the cavity layer, the feed network layer and the circularly-polarized network layer are sequentially stacked to form a multilayer stacked structure. One side, backing on to the cavity layer, of the radiation layer is provided with 8*8 radiation units which are arranged in an array. Each radiation unit comprises a circular ridge opening waveguide with two symmetric ridges, and a first coupling feed straight gap which is disposed on a bottom wall of the circular ridge opening waveguide, wherein the two ridges are located at two opposite sides of the first coupling feed straight gap, and the vertical connection line of the two ridges and the first coupling feed straight gap form a 45-degree inclined angle. The 8*8 radiation units are divided into four radiation unit groups, and each radiation unit group comprises 4*4 radiation units which are arranged in an array. One radiation unit group is taken as a fixed point reference, and other three radiation unit groups sequentially rotate 90 degrees, 180 degrees and 270 degrees anticlockwise or clockwise.

The invention relates to a C-band broadband circularly polarized single pulse array antenna which is suitable for the technical field of airborne communication. The C-band broadband circularly polarized single pulse array antenna specifically comprises an antenna support plate, a bottom-layer microstrip array, a radiant patch layer and an upper-layer cover plate, wherein the bottom-layer microstrip array is placed on the antenna support plate and stuck with a bottom-layer metal plate together through a conductive adhesive, the radiant patch layer is placed over the bottom-layer microstrip array and fixed on the antenna support plate, the upper-layer cover plate is fixed above the radiant patch layer, used for pressing radiant patches and fixedly connected with a side frame of the antenna support plate through screws, and the incomplete sequential rotation feed way is used for ensuring the broadband and low axis ratio properties of the antenna; and a double-layer antenna structure is adopted for expanding the gain and standing wave bandwidth of the antenna. The invention provides the circularly polarized single pulse array antenna for airborne communication, which has the advantages of low cost, high finished product rate, broad working bandwidth, low axis ratio, light weight, short processing cycle, high gain and capability of meeting the requirements of a beam and difference beam directional diagram.

The invention relates to a high-gain planar wide-frequency antenna which relates to a microwave technology and comprises an Archimedean spiral antenna radiation sheet, a tapered balun and a shell, wherein a reflection cavity is arranged in the shell, and the Archimedean spiral antenna radiation sheet is connected with a signal source accessing end through the tapered balun. The invention has the advantages that the gain of a wide-frequency spiral antenna is improved to a great degree, the circular polarization characteristic of far-field radiation is good, and meanwhile, the standing wave of the whole antenna system also has better performance. The invention has high gain, stable gain, lower axial ratio and wide application potential in the aspects of military affairs and civil use.

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.

The invention provides a microstrip series-fed linear array circularly polarized microstrip antenna and aims to provide a high gain, low axis ratio, wide band waveguide interface microstrip series fed antenna, the invention is realized by the following technical scheme: A surface copper coating on a dielectric substrate (2) is etch into a linear array microstrip metal radiation patch (5) connected in series with a microstrip string feed line (4) and a transition metal patch (8) connected with that microstrip string feed line, a rectangular coupling slots of corresponding transition metal patch and H-shaped couple patch (10) placed into the rectangular coupling slot (9) are etched on that metal floor of the lower surface layer of the dielectric substrate (2); Metal shield hole (6) penetrating that upper and lower surface of the dielectric substrates are arranged around of the rectangular coupling gap in an enveloping manner; The metal plate (1) is provided with a waveguide cavity (7)penetrating the metal plate; The circularly polarized microstrip antenna in which the transition metal patch, a rectangular coupling slot, an H-shaped coupling patch and a metal shield hole realize the electromagnetic wave transmission between the series feeder and the waveguide interface, and a microstrip metal radiation patch realizes radiation is formed. .

The invention discloses a coaxial S/X dual-frequency sharing feed source network. The coaxial S/X dual-frequency sharing feed source network comprises a coaxial horn feed source, wherein the coaxial horn feed source is composed of an S-frequency-band horn and an X-frequency-band horn, the S-frequency-band horn is externally connected with an S-frequency-band feed network, and the X-frequency-band horn is externally connected with an X-frequency-band feed network, arranged in the S-frequency-band horn in a sleeved mode and coaxial with the S-frequency-band horn. Four transmission arms distributed in the form of a cross and used for achieving S-frequency-band signal wave separating are arranged at the bottom of the S-frequency-band horn, and inner cavities of the four transmission arms are communicated with the inner cavity of the S-frequency-band horn. The coaxial S/X dual-frequency sharing feed source network achieves S-frequency-band single-pulse tracking and circular polarization signal receiving and sending and X-frequency-band single-pulse tracking and circular polarization signal receiving, has the advantages of being wide in working band, small in standing wave, large in power capacity, small in consumption, low in sidelobe, good in directional diagram equalization, small in axial ratio and the like and is suitable for a double-reflection-face multi-frequency multi-tracking-satellite communication and control antenna with the length larger than 7.3 m.

The invention discloses a low-sidelobe circular polarized microstrip array antenna applied to an electronic toll collection (ETC) system, wherein the antenna is has a three-layer structure successively including a metal foil, a dielectric substrate and a metal foil. A microstrip feed network and radiation units are arranged on the metal foil on the top of the structure; the radiation units employs a grouping mode in which n radiation units are arranged transversely and two radiation units are arranged longitudinally. There is a rotation angle difference of 90 degrees anticlockwise between each of the radiation unit above the longitudinal column and each of the radiation unit below the longitudinal column; compared with a feed phase of the radiation unit below the longitudinal column, a feed phase of the radiation unit above the longitudinal column is delayed by 90 degrees; and magnitudes of the feed currents of the radiation units at the same longitudinal column are equal. A feed joint is utilized to realize application of current excitation on a whole microstrip feed network, so that the whole microstrip feed network applies currents on all the radiation units. A simplified dolph-chebyshev distribution is utilized for current magnitude ratios that are needed by the radiation units on a same transverse line; and current phases are equal. According to the invention, the microstrip antenna has advantages of low axial ratio, low sidelobe and high gain; and moreover, the antenna is easy to process and install; therefore, the provided antenna can be widely applied to the electric toll field and other related fields.

The invention relates to a dual-frequency band antenna structure and a manufacturing method thereof. The dual-frequency band antenna structure comprises a first substrate unit, a second substrate unit, and an adhesion unit. The first substrate unit consists of a first insulating substrate, a first electrode layer and a first ground layer; the second substrate unit includes a second insulating substrate, a second electrode layer and a second ground layer, wherein a second dielectric coefficient is larger than a first dielectric coefficient; and a connecting pin unit includes a feed connecting pin successively penetrating the second substrate unit and the first substrate unit, wherein the feed connecting pin is insulated with the first electrode layer and the second electrode layer mutually and the first ground layer and the second ground layer are insulated with each other. The first substrate unit and the connecting pin unit cooperate with each other to form a first antenna with a first set working frequency band; and the second substrate unit and the connecting pin unit cooperate with each other to form a second antenna with a second set working frequency band, wherein the first set working frequency band is larger than the second set working frequency band.

A quad-fed patch antenna is disclosed, including a ground plane and a substantially tetragonal radiating patch spaced from the ground plane, an upper surface of the substantially tetragonal radiating patch having a first side, a second side, a third side, and a fourth side defining a first corner, a second corner, a third corner, and a fourth corner located within a second plane substantially parallel to the ground plane. A signal feed is associated with the each side of the substantially tetragonal radiating patch, wherein the first signal feed, the second signal feed, the third signal feed and the fourth signal feed are fed progressively in phase quadrature.

The invention relates to an X-band low-grating-lobe circularly polarized antenna, which is composed of a long horn antenna and a separator plate polarizer. The long horn antenna adopts a multi-inner-cavity design of metal separator plates. The aperture field distribution is improved by filling a radiation aperture surface with a dielectric material, so that the antenna gain and aperture efficiencyare improved, narrower directional diagram zero-point width is ensured, and grating lobe suppression capability is improved. The long horn antenna is connected with the separator plate polarizer through a flange in a waveguide cascade mode. The separator plate polarizer is a square waveguide with a metal separator plate in the middle, and the square waveguide is divided into two rectangular waveguides through the metal separator plate, so that a transmitting channel and a receiving channel are formed; and coaxial waveguide conversion of guide openings of the two rectangular waveguides is achieved through a stepped impedance converter. The X-band low-grating-lobe circularly polarized antenna adopts the waveguide as a main body structure, so that the complexity of structural design is simplified, the link loss is reduced, the utilization efficiency of the aperture of an array surface is improved, and the later-period assembly production and equipment debugging efficiency is improved.

The invention discloses a single-groove deep C/Ku dual-band differential mode tracking feed source, and belongs to the technical field of the communication antenna. The feed source comprises a single-groove structure corrugated horn and a differential model feeder line synthesis network; the single-groove structure corrugated horn is composed of a transition section, a mode conversion section, a frequency conversion section, an angle variable section and a radiation section; the frequency conversion section is a single groove structure form composed of multiple groove periods, the first to the eighth coupling ports are uniformly and orderly formed on the circumference of the corrugated horn corresponding to one groove period at the front part of the angle variable section, the included angle between two adjacent coupling ports is 45 DEG. The single-groove deep C/Ku dual-band differential mode tracking feed source disclosed by the invention can realize the dual-band communication, the dual-band single-pulse tracking and the dual-band share, and has the advantages of being rotational symmetry in directional diagram, low in side lobe level, small in reflection loss, high in gain, and rotational symmetry in differential directional diagram.

An RFID circularly polarized air microstrip antenna provided by the invention is characterized in that a lower-layer metal radiation patch is arranged above a metal grounding plate, and an upper-layermetal radiation patch is arranged above the lower-layer metal radiation patch; a metal pillar is fixedly installed in the center of the metal grounding plate, and the upper metal radiation patch andthe lower metal radiation patch are fixedly installed on the metal pillar through the installation holes respectively; a feed network is L-shaped and is connected with the lower radiation patch, a metal tuning sheet is arranged between the feed network and the metal grounding plate, a metal screw is arranged between the metal tuning sheet and the feed network, and a feed probe is welded at the bottom of the metal tuning sheet. The antenna has the advantages of being small in size, low in profile, large in gain, wider in 3dB axial ratio and impedance bandwidth and the like, the impedance bandwidth of the antenna can be increased, the standing-wave ratio of the antenna can be reduced, the axial ratio of the antenna can be effectively reduced, and the ideal axial ratio bandwidth can be obtained.

The application relates to the technical field of satellite positioning, in particular to a satellite signal receiver. The satellite signal receiver can include a doubly fed network antenna used for receiving a satellite radio frequency signal, a frequency mixing coupler connected with the doubly fed network antenna and used for shifting the phase of the satellite radio frequency signal, and a radio frequency circuit board. The doubly fed network antenna and the frequency mixing coupler are integrated on the radio frequency circuit board. The cost of equipment and the complexity of the systemare reduced by integrating the doubly fed network antenna and the frequency mixing coupler on the radio frequency circuit board. High-precision positioning information is provided by raising the impedance bandwidth of the antenna, increasing the antenna gain and improving the half power beam width of the antenna. Moreover, the phase center is made more precise by reducing the axial ratio of the antenna, so that the antenna still has a good receiving effect in a mobile environment, and the satellite signal receiver has strong anti-multipath-interference performance.

The invention relates to a wide-aspect-angle S-band dual-circular-polarization microstrip antenna for a phased array, and the phased array. The microstrip antenna comprises a top dielectric layer, a central dielectric layer, a bottom dielectric layer, an annular structure located above the top dielectric layer, a rectangular paster and an annular structure which are located on the central dielectric layer, a gap on a ground plate, a first feed line and a second feed line which are located below the bottom dielectric layer. Two ends of the microstrip antenna are respectively connected with a left-hand circular polarization port and a right-hand circular polarization port, wherein the left-hand circular polarization is obtained through the port, and the right-hand circular polarization is obtained through the port. The microstrip antenna has the scanning range of +/-70 degrees, is wide in bandwidth, is large in beam width, is low in width-angle axial ratio, and is simple in structure. The microstrip antenna has two ports, thereby facilitating the free selection of the left-hand circular polarization mode or the right-hand circular polarization mode. The microstrip antenna can be extended to form a large-scale phased array with a random number of antennas.

The invention relates to a Ku-frequency-band transmitting-receiving linear and circular polarization multiplexing feed source network that is formed by combination of a Ku-frequency-band transmitting-receiving four-port network and a Ku-frequency-band linear and circular polarization switching network. The Ku-frequency-band transmitting-receiving four-port network consists of a door torsion type partial wave head, two U-shaped bending waveguides I, two U-shaped bending waveguides II, two broadband waveguide magic units T, two waveguide loads, two Z-shaped bending waveguides I, a +45-degree twisted waveguide, a -45-degree twisted waveguide, a phase compensation waveguide, two Z-shaped bending waveguides II and two transceiver frequency duplexers. Besides, the Ku-frequency-band linear and circular polarization switching network includes four waveguide switches, four E-plane bending waveguides, two U-shaped bending waveguides III, two U-shaped bending waveguides IV, two EH dual-plane bending waveguides, a receiving-frequency-band +/45-degree phase shifter, a transmitting-frequency-band +/- 45-degree phase shifter and two waveguide magic units T. According to the invention, the waveguide switches are used as linear and circular polarization switching components, so that switching is carried out rapidly and the in-place rate is high; and the airtightness of the feed source network is guaranteed. Meanwhile, the network has characteristics of compact structure, debugging avoidance, and excellent standing-wave, axial-ratio, and port isolation performances.

The invention discloses a polarized reconfigurable antenna. The polarized reconfigurable antenna comprises a dielectric substrate (1), an upper metal layer (21), a lower metal layer (22), a pair of controllable grounding through holes (5) with symmetrical structures, and more than two metal through holes (41) in array configuration to form a cavity body (4); the upper metal layer (21) is provided with an antenna radiation structure while the lower metal layer (22) is provided with an antenna feed structure; the grounding through holes (5) are connected with a switch separately; and the switch is used for controlling the grounding states of the grounding through holes (5) to realize different current disturbances. By changing the switch state, namely, changing the states of the pair of controllable grounding through holes, current disturbances are changed to form three kinds of different polarized waves, including linear polarization wave, left-hand circular polarization wave and right-hand circular polarization wave, thereby realizing the polarized reconfigurable antenna.