56results about How to "Good circular polarization characteristics" patented technology

The invention relates to a Ku-band circularly polarized dielectric resonator antenna which comprises a metal grounding plate and a micro-strip feeder line. The metal grounding plate is arranged on the upper surface of a dielectric substrate, and the feeder line is arranged on the lower surface of the dielectric substrate. A three-tier dielectric resonator is arranged at the center of the upper surface of the metal grounding plate; a crisscrossed gap is formed in the center of the metal grounding plate; the inner end of the micro-strip feeder line is arranged right below the crisscrossed gap and forms a 45-degree angle with the same; two cascade-connection dumbbell-shaped groove gaps are formed in the grounding plate. Impedance bandwidth of the antenna is 27.67%, circularly polarized axial ratio bandwidth 6.56%. within working frequency, the maximum gain of the antenna is 8.2dB, the minimum gain is 6.0dB, and the antenna has wider coverage range. Axial ratio of the 12.2GHz position is approximately 0.09dB, and the antenna has good circularly polarized characteristics. The antenna covers commonly used working frequency bands of satellite television broadcasting in IT3, and is applicable to a satellite television broadcasting system within 11-14.5GHz frequency bands.

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.

The invention relates to a broadband circularly polarized filter antenna used for a Beidou terminal and belongs to the technical field of antennas of wireless communication terminals. A folding technology is utilized by the antenna; and a secondary cascade power divider at a bottom layer and a 90-degree phase shifter are cascaded to provide a top radiation patch with a relatively large circular polarization bandwidth. In order to further improve the circular polarization performance of the antenna, two orthogonal bow-tie gaps are etched on the top radiation patch loaded by a regular hexagon gap; and the top patch is divided into five radiation areas to generate multimode resonance, good impedance matching is achieved and the enough circularly polarization bandwidth is obtained. Furthermore, a feed network and a radiation antenna are arranged at two sides of a grounding plate respectively, so that energy can intensively radiate an upper half space effectively, and the antenna not only can radiate in a right-hand circular polarization manner, but also can achieve relatively good circular polarization trap performance on a specific frequency point.

The invention discloses a low-profile two-dimensional wide-angle scanning circular polarization phased-array antenna, and aims to provide an antenna structure which is easy to integrate and has good wide-angle scanning gain characteristics and circular polarization characteristics. According to the technical scheme, each 3D structure antenna unit forms an array unit of the two-dimensional wide-angle scanning circular polarization phased-array antenna through metal columns which are arranged between an annular radiator and a circular polarization patch slotting radiator in a circumferential circular array mode; each 3D structure antenna unit is fixed on the two-dimensional layer surface of the upper dielectric plate through a feed column fixedly connected to the lower surface of the circularly polarized slotted patch radiator; the feed column penetrates through the lower dielectric plate, the four 3D structure antenna units are connected with the annular radiator upwards and are connected with the feed base disc downwards, the four adjacent 3D structure antenna units form a 2*2 rectangular arrangement subarray in a touch type feed and 90-degree sequential rotation arrangement mode,and the four feed base discs are delayed by 90 degrees clockwise in sequence for feeding, so that the optimal right-handed circular polarization performance is obtained.

The invention discloses an ultra-wideband electromagnetic super-surface circular polarizer, which comprises a dielectric substrate, a metal resonance array and a metal grounding plate, wherein the metal resonance array is printed on the top surface of the dielectric substrate; the metal grounding plate is printed on the back surface of the dielectric substrate; the metal resonance array comprises a plurality of micro-crack Jerusalem cross units which are arranged in a periodic matrix; each micro-crack Jerusalem cross unit is equal in structure parameter and comprises two orthorhombic I-shaped metal arms, namely a horizontal I-shaped metal arm extending in the horizontal direction, namely an X axis, of the dielectric surface, and a vertical I-shaped metal arm extending in the vertical direction, namely a Y axis, of the dielectric surface; the center of a horizontal metal wire at the middle part of the horizontal I-shaped metal arm is intersected with the center of a vertical metal wire at the middle part of the vertical I-shaped metal arm; two micro-cracks which run through the horizontal metal wire at the middle part are etched on the horizontal metal wire at the middle part of the horizontal I-shaped metal arm; and the two micro-cracks are symmetrically located at the left side and the right side of the vertical metal wire at the middle part of the vertical I-shaped metal arm. The ultra-wideband electromagnetic super-surface circular polarizer has the characteristic of high working frequency.

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 an antenna oscillator assembly, an antenna and a piece of communication equipment. The oscillator assembly comprises a cross sector intersecting oscillator, a support feed assembly, a ground plate and a polarization isolation power dividing device. The cross sector intersecting oscillator is fixed on the top of the support feed assembly. The bottom of the support feed assembly is fixed on the center of the ground plate. The polarization isolation power dividing device is arranged on the central position of the ground plate back side. The cross sector intersecting oscillator is connected with the polarization isolation power dividing device through a coaxial supply line inside the support feed assembly. The antenna oscillator assembly which is no longer dependent on microwave dielectric plates solves the multi-frequency wideband circular polarization feed problem. Meanwhile, by forming the cross sector intersecting oscillator and adjusting the height of the cross sector intersecting oscillator away from the ground plate, the antenna oscillator assembly achieves more flexible directional diagram control and optimized circular polarization characteristics. By means of the polarization isolation power dividing device, the antenna oscillator assembly can make de-rotation multipath signals suppressed. The antenna oscillator assembly which has the characteristics of wideband, low consumption and high efficiency can make the volume, the weight and the cost of the antenna obviously reduced.

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 provides a reconfigurable mono-pulse antenna. The reconfigurable mono-pulse antenna comprises fourantenna units arranged along longitudinal and transversal directions in a two-dimensional array manner, four switches in one-to-one correspondence with the antenna units, and a one-to-four equal-amplitude and equal-phase-position power distributor; each antenna unit comprises two feed ports; the feed ports at the two ends of each antenna unit are connected with the switches respectively through finite ground coplanar waveguide transmission lines; among the ports at the two ends of the antenna units, only one port is in the working state though the switch control; and four branches of the one-to-four equal-amplitude and equal-phase-position power distributor are connected with the switches respectively, and can feed one port of the two ports of the four antenna units separately through the switch control. The input ports of the antenna units can be changed by changing the states of the switches so as to change the phase positions of the antenna units to form three different antenna patterns: sum beams, azimuth difference beams and pitch difference beams so as to realize mono-pulse positioning.

The invention discloses an antenna and a wireless communication device. The antenna comprises an upper radiating plate, a frustum and a lower feed network layer. The upper radiating plate consists of a first substrate, a first conductive layer, and four feed points in a rotational symmetric mode; the first conductive layer is arranged at the upper surface of the first substrate; and the four feed points are formed on the first conductive layer and are connected with the lower feed network layer electrically. The frustum is provided with an accommodation space; and the upper radiating plate and the lower feed network layer are arranged in the accommodation space at an interval. According to the antenna disclosed by the invention, the four feed points in a rotational symmetric mode are used for feeding and the difference value between phases of the feed points are 90 degrees, so that the polarization characteristic can be realized. Moreover, with the antenna having the four feed points, the high phase center stability can be realized; the antenna having the four feed points has high symmetry, so that the roundness feature of the antenna can be realized and the high-precision measurement requirement can be met.

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.

The invention relates to a circular cone logarithm helical antenna, in particular to a circular cone logarithm helical antenna with a frustum. The problems that according to an existing circular cone logarithm helical antenna, a directional diagram is prone to sectioning and gain is low are solved. The circular cone logarithm helical antenna with the frustum comprises two single-arm circular cone logarithm helical units which rotate by 180 degrees along normal lines of the two sing-arm circular cone logarithm helical units and are arranged in a winding mode. The arithmetic expression of the two sing-arm circular cone logarithm helical units (1) is p=p0exp b phi, wherein 2theta0 is the included angle among the circular cone generatrix and the normal lines and called a circular cone opening angle. Alpha is the included angle between the circular cone logarithm helical winding direction and the circular cone genetatrix and called a circular cone inclination angle. Phi is an independent variable and namely the included angle among the top point of a polarization coordinate axis and a coordinate axis and all points of a helical line. The circular cone logarithm helical antenna further comprises the hollow frustum, and the two single-arm circular cone logarithm helical units are arranged in the hollow frustum, wherein 2theta0=15-20 degrees, and alpha=70-80 degrees. The circular cone logarithm helical antenna is used for the fields of mobile phone antennas, wireless local area networks and satellite communications.

The invention discloses a GPS antenna positioning structure, including a helical antenna group and a PCB. The helical antenna group is welded together with the PCB by ultrasonic welding, the helical antenna group includes a four-arm helical antenna, the single-arm helical antenna is composed of two gradient helixes; the PCB comprises a horizontal substrate and a vertical substrate formed by a Wilkinson phase-shift feed network; the horizontal substrate is provided with a first radio frequency port, a second radio frequency port, a third radio frequency port, and a fourth radio frequency port in matched connection with the helical antenna; and the second radio frequency port and the fourth radio frequency port are connected with 90-DEG phase shifters. The GPS antenna positioning structure has the beneficial effects that in a mode of optimizing the helical arm, wide-band operating performance can be better realized, the antenna beam width is widened, and the low elevation angle gains ofthe antenna are improved.

The invention discloses a small ultra-wideband circularly polarized planar helical antenna, which comprises a self-compensating composite helical structure serving as a radiating element of the antenna and a microstrip gradient balun structure for feeding, wherein the microstrip gradient balun structure is a double-sided structure, two unbalanced microstrip lines are gradually changed into balanced parallel double lines, and impedance conversion is realized in the gradual change process; and the unbalanced end of the microstrip gradient balun structure extends downwards to a reflector. The small ultra-wideband circularly polarized planar helical antenna provided by the invention maintains a stable radiation property, the impedance bandwidth of the antenna reaches 150% (2-18GHz), a standing-wave ratio is less than 2, the antenna maintains an excellent circular polarization property in the working bandwidth (2-18GHz), and an axial ratio is less than 3dB. On the basis of ensuring the radiation property, impedance bandwidth and axial ratio bandwidth of the antenna, the plane size and profile size of the antenna are reduced, and the property of miniaturization is achieved.

The invention relates to an S-band dual-circular-polarization high-integration broadband phased array subarray antenna, and belongs to the technical field of communication. The antenna comprises an independent radiation layer and a multi-layer microstrip patch antenna; the PCB 4 of the independent radiation layer is a Tacic single-sided core board; the multi-layer microstrip patch antenna is formed by mixing and pressing a single-face core board PCB 1, a single-face core board PCB 2 and a double-face core board PCB 3 through prepregs, so as to form a feed network strip line model. Taconic single-face core boards are adopted as the single-face core board PCB 1 and single-face core board PCB 2 of the multi-layer microstrip patch antenna, and a Taconic double-face core board is adopted as the double-face core board PCB 3; the independent radiation layer and the multi-layer microstrip patch antenna are fastened through a metal stud. The antenna has the advantages of being high in isolation degree, wide in working bandwidth, good in circular polarization characteristic and excellent in voltage standing wave ratio, and meanwhile the antenna has the advantages of being low in profile, simple in structure, easy to machine and the like.

The invention provides a dual-circularly-polarized broadband wide-beam antenna. The antenna comprises a circular waveguide, a feed probe, a load probe, a partition plate phase shifter and a metal ring group; the feed probe, the load probe and the partition plate phase shifter are all located in the circular waveguide, and the feed probe and the load probe are located on the two sides of the partition plate phase shifter respectively. One end face of the circular waveguide is closed, and the other end face is provided with an opening; energy fed in by the feed probe is converted into circularly polarized waves through the partition plate phase shifter and then is radiated outwards from the opening; the metal ring group is positioned beside the opening and is used for introducing horizontal annular magnetic current; the side wall, close to the opening, of the circular waveguide is provided with a hollowed-out groove set used for introducing vertical magnetic current. Circularly polarized waves with directional radiation are formed through the circular waveguide and the partition plate phase shifter; horizontal annular magnetic current is introduced, and the half-power beam width is increased; the vertical magnetic current is introduced, the half-power beam width in the broadband is further improved, the difference value of the E theta sum in a certain beam is reduced, and the axial ratio beam width is improved.

The invention provides a circular polarization implementation mode. The circular polarization implementation mode comprises the steps of taking three points A, B and C on the circumference of a metalloop antenna; performing feeding on the point A, and connecting capacitors or inductors with specific reactance values in series at the point B and the point C, wherein the phase difference of the twocharacteristic modes is 90 degrees at frequency points with equal amplitudes, the antenna designed by adopting the method can achieve good circular polarization characteristics, and an axial ratio simulation result at a resonant frequency point shows that the axial ratio is less than 3dB.