76results about How to "Increased Polarization Purity" patented technology

A radiator element includes a pair of substrates each having a transition section and a feed surface, each of the substrates is spaced apart from one another. The radiator element further includes a balanced symmetrical feed having a pair of radio frequency (RF) feed lines disposed adjacent to and electromagnetically coupled to the feed surface of one of a corresponding one of the pair of transition sections, and the pair of radio frequency feed lines forms a signal null point adjacent the transition sections.

Wireless repeaters that utilize balanced and quasi-balanced antenna feed circuits for feedback suppression. The wireless repeater typically implements dual cross-polarization isolation both along and between uplink and downlink signal paths, which relies on dual-polarization server and donor antennas. The unit may utilize balanced antenna feeds for both polarizations or balanced antenna feeds for one polarization and unbalanced antenna feeds for the other polarization. In addition, the unbalanced antenna feeds may be deployed in a two-element quasi-balanced configuration, and the antenna may include dual-polarization antenna element. The antenna elements may include dual-polarization antenna elements or separate antenna elements for each polarization.

The invention discloses a high isolation dual-polarized microstrip antenna fed by slot, which comprises a first-layer medium plate, a second-layer medium plate and a third-layer medium plate, wherein the second-layer medium plate and the third-layer medium plate are arranged below the first-layer medium plate, and the lower surface of the first-layer medium plate is provided with radiation stickers; the second-layer medium plate and the third-layer medium plate are fixedly connected to form a whole by a public metal layer, and the public metal layer is provided with a standard cross-shaped slot; the upper surface of the second-layer medium plate and the lower surface of the third-layer medium plate are respectively provided with a first feeding structure and a second feeding structure, and the symmetry axes, which are projected on the public metal layer, of the first feeding structure and the second feeding structure coincide with the symmetry axis of the horizontal slot along the length direction and the symmetry axis of the vertical slot along the length direction. The dual-polarized antenna of the invention can greatly improve the isolation between two orthogonal polarized fields of the dual-polarized antenna, and has extensive applicability and flexibility.

The invention discloses a broadband dual-polarized antenna unit, which is used for realizing broader band characteristic. A radiating element comprises a reflective plate, a main radiating body, an upper insulating block, a lower insulating block and a balance feed device, wherein the main radiating body comprises a support body and radiating pieces; four radiating pieces and the support body form a whole, and the four radiating pieces respectively form an angle of 90 degrees with the support body; the outline of each radiating piece has a 90-degree fan shape; each radiating piece is provided with a hollowed structure and a loading section used for broadening the bandwidth and improving polarization purity; a clearance between two adjacent radiating pieces is less than 0.1 wavelength; and the radiating element adopts coupling balance feed and an integrated design that four support body bottoms are mutually short-circuited, and is fixed on the reflective plate. The broadband dual-polarized antenna unit has impedance bandwidth of over 45 percent, and has the advantages of small size, simple structure, a few components, convenience for assembly, easy production, low cost and the like.

The invention discloses an active ring resonator-based single longitudinal mode low noise narrow band column vector fiber laser. The single longitudinal mode low noise narrow band column vector fiber laser comprises a pumping source, a wavelength division multiplexer, a gain fiber, an isolator, a coupler, a seed source, a first optical circulator, a second optical circulator, a single-mode fiber, a few-mode fiber engraved with a grating, a first polarization controller and a second polarization controller which are connected with one another in a closed end-to-end manner through a fiber coupling way to form a ring optical fiber resonator. The components of the single longitudinal mode low noise narrow band column vector fiber laser adopts an all-fiber coupling mode; the structure is compact, the polarization purity of output column vector laser is high, the coherence is well, a single longitudinal mode working manner is realized, and the spectrum stability is high.

The invention discloses a dual-probe reverse phase feeding microstrip antenna, which comprises a first medium substrate, a second medium substrate and a ground level, wherein the first medium substrate is parallel to the ground level; the second medium substrate penetrates through the ground level vertically; the upper end of the second medium substrate is adjacent to the lower surface of the first medium substrate; the first medium substrate is provided with a microstrip patch; a first L-shaped probe strip and a second L-shaped probe strip are arranged symmetrically on the second medium substrate; the first L-shaped probe strip is formed by connecting a first coupling exciting strip which is parallel to the ground level and a first feeding strip which is vertical to the ground level; the second medium substrate is partitioned into an upper area and a lower area by an intersection line between the second medium substrate and the ground level; an area of the second medium substrate, which is positioned on the lower side of the intersection line, is provided with a microstrip power divider in two penny; one path of the microstrip power divider is connected with the first feeding strip through an inverter; and the other path of the microstrip power divider is directly connected with the second feeding strip.

The invention discloses a Cassegrain reflective array antenna, which comprises a waveguide feed, a main reflective surface and a sub-reflective surface, wherein the waveguide feed, the main reflectivesurface and the height difference between the sub-reflective surfaces are jointly determined by a design focal length and a mirror image principle; the antenna comprises a waveguide feed, a main reflective surface and a sub-reflective surface. The waveguide feed is used for emitting spherical waves; The main reflecting surface is used for converting the spherical wave into plane wave while polarizing and twisting 90 DEG; The sub-reflecting surface has the function of polarization filtering, that is, the sub-reflecting surface can maintain the total transmission of a linearly polarized wave while reflecting the cross-polarized wave. The Cassegrain reflective array antenna realizes 48% of 3dB gain bandwidth and 68.4% of 20dB cross polarization suppression bandwidth, and the profile is almost half of that of the reflective array antenna, thus realizing the characteristics of low profile, wide band, high gain and high polarization purity operation.

The invention provides a radiation structure and an array antenna. The radiation structure comprises a radiation fin with a radiation slot in the middle. The radiation slot consists of a transverse slot and a longitudinal slot, which are communicated with each other and are cross-orthogonal. The length of the transverse slot and the length of the longitudinal slot are less than the length of the radiation fin in the extending direction of the corresponding radiation slot. By adding the radiation slot to the radiation fin, the radiation structure can produce two kinds of radiation synchronouslywhen working in an antenna system, so as to achieve an effect of polarization vector superposition enhancement. Thus, the same radiation efficiency and radiation gain of the multi-layer patch structure in the traditional antenna can be achieved by only one layer of radiation fin, fewer components are used, the structure is simple, the antenna profile can be reduced, and antenna miniaturization isfacilitated.

The invention discloses a small high-isolation dual-polarization medium resonator antenna. The antenna comprises an antenna structure frame, a circuit board, a first load metal sheet, a second load metal sheet, and a rectangular medium resonator. The circuit board is arranged on the antenna structure frame and is provided with an H-shaped gap feed structure. The first load metal sheet is arranged on the circuit board. The second load metal sheet is arranged on the antenna structure frame and under the circuit board. The rectangular medium resonator is arranged on the circuit board. A gap is formed between the rectangular medium resonator and the first load metal sheet, and a gap is formed between the rectangular medium resonator and the first load metal sheet. The rectangular medium resonator rotates 45 DEG around the central shaft of the circuit board, so two edges of the rectangular medium resonator are in the direction parallel to the diagonal of the circuit board, thereby forming +/- 45 DEG dual polarization.

The invention provides a dual-polarization plane reflective array antenna. The antenna comprises a dual-polarization feed source used for emitting dual-polarization electromagnetic waves and a plane reflective plate used for focusing and modulating the incident dual-polarization electromagnetic waves, wherein the reflective plate comprises two or more than two reflective arrays; the reflective arrays form one or more phase-shifting units for performing phase shifting; and the plane reflective plate has convergence capability for the dual-polarization incident electromagnetic waves within a preset angle range in the normal direction of the reflective plate.

The invention discloses a method and system for generating a polarization state of a high-order Poincare sphere with robustness. The method comprises the following steps of: loading a vortex phase on a completely coherent vector light beam, and then regulating and controlling the completely coherent vector light beam into left-handed circularly polarized light and right-handed circularly polarized light of the high-order Poincare sphere; synthesizing the left-handed circularly polarized light and the right-handed circularly polarized light into vector polarized light on the high-order Poincare sphere, and generating a polarization matrix of the high-order Poincare sphere through adjustment; reducing the spatial coherence of the polarized light, obtaining a random electromagnetic beam through shaping, and extracting polarization information in a polarization matrix to a spatial correlation tensor of the random electromagnetic beam; transmitting a random electromagnetic beam to a far field, in the far field, transferring polarization information from a space correlation tensor to a polarization matrix of the random electromagnetic beam, and obtaining a high-order Poincare sphere polarization state with robust characteristics. The problems that an existing high-order Poincare spherical polarized beam is difficult to generate, does not have the robust characteristic and is easily damaged by the external environment are solved.

The invention discloses a radiation patch for a microstrip antenna and the microstrip antenna and relates to the technical field of antennas. The radiation patch for the microstrip antenna and the microstrip antenna aim at solving the problems that broadband-orientation and miniaturization of an existing microstrip antenna can not be achieved and the cross polarization rejection ratio is not ideal. Cross-shaped grooves are formed in the radiation patch for the microstrip antenna and comprise at least four long sealing grooves arranged in a cross shape. The long sealing grooves are not communicated with one another. The radiation patch for the microstrip antenna and the microstrip antenna are used for design of antennas of a mobile communication base station.

The invention discloses a single reflecting surface compact range device of high cross polarization isolation. The device is mainly composed of a reflecting surface of a single reflecting surface compact range, a feed source and a polarization grid. The feed source illuminates the precise reflecting surface of the single reflecting surface compact range and beforehand collimates and corrects spherical waves into planar waves. To lower shielding of the feed source, an offset feed structure is adopted in geometric layout, while the offset feed layout is the main reason of large cross polarization. The polarization grid is arranged in front of a planar wave silent area of the single reflecting surface compact range, and a silent area range is subjected to polarization filtering and gating, wherein the polarization states of the feed source and the polarization grid are controlled by respective controllers. Polarization and gating of the polarization grid have the advantages of wideband working, can almost completely reflect the polarization component parallel to polarization grid silk, almost completely transmit the polarization component perpendicular to the polarization grid silk and improve the polarization isolation of the single reflecting surface compact range to a great extent with the cost of introducing very small insertion loss. The engineering achievability of compact range system design is improved, and control over the dynamic range of a radio frequency system is improved.

The invention belongs to the field of millimeter wave antennas and provides a wideband high-isolation low-cross polarization dual polarization antenna, which is applicable to a terahertz-band wirelessfull-duplex communication system. The wideband high-isolation low-cross polarization dual polarization antenna comprises a wideband sub array feed network and a dual polarization sub array unit antenna, wherein the dual polarization sub array unit antenna comprises a polarization one feed structure, a polarization two feed structure, a polarization isolation structure, a sub array power divisionstructure and a radiation unit; the polarization one feed structure and the polarization two feed structure are connected with the polarization isolation structure and the excitation modes of the twoare orthogonal; the sub array power division structure is arranged on the polarization isolation structure and is composed of a power division coupling cavity and a coupling gap arranged on the uppersurface of the power division coupling cavity, and the coupling gap is connected with the radiation unit through a matching structure. According to the wideband high-isolation low-cross polarization dual polarization antenna provided by the invention, wideband high-efficiency high-gain features can be realized, the dual polarization input port has high isolation (larger than 60 dB), and the dual polarization has high polarization purity (larger than 50 dB).

The invention belongs to the field of wireless communication, and particularly relates to a small broadband differential excitation dual-mode and dual-polarized base station antenna in this field. Theantenna comprises a first dielectric plate, a second dielectric plate a third dielectric plate, a reflection plate, a coaxial connector, a radiation patch, a driving branch and baluns. The first dielectric plate is horizontally arranged at the uppermost layer of the whole antenna; the reflection plate is horizontally arranged at the lowest layer of the whole antenna; the pair of mutually orthogonal baluns are arranged between the first dielectric plate and the second dielectric plate, and the first dielectric plate and the reflection plates are respectively perpendicular to the baluns up anddown; the orthogonal surfaces of the orthogonal baluns are respectively printed with the second dielectric plate and the third dielectric plate to allow the second dielectric plate and the third dielectric plate to be mutually perpendicular to the first dielectric plate and the reflection plate. The small broadband differential excitation dual-mode and dual-polarized base station antenna ensuresthe miniaturization while ensuring the broadband.