76results about How to "High gain characteristic" patented technology

The invention discloses an ultra-wideband planar phased array antenna and a beam scanning method thereof, and relates to the technical field of antennas. The ultra-wideband planar phased array antennacomprises a dielectric substrate, and a liquid crystal phase shifter network which is externally applied with a bias voltage and arranged on the dielectric substrate, wherein the liquid crystal phaseshifter network is composed of a plurality of liquid crystal phase shifter units. An antenna unit array which covers a plurality of frequency bands is arranged above the liquid crystal phase shifternetwork; and the antenna unit array is composed of a plurality of antenna units, wherein the antenna unit is a Vivaldi antenna with a slot line, and a liquid crystal phase shifter is powered through amicrostrip line-slot line structure. Compared with the prior art, the problems that the ultra-wideband phase-controlled profile is high in profile degree, large in antenna loss and low in utilizationrate are solved.

The invention provides a multiple wavelength output single-frequency optical fiber laser with ultra-narrow line width, which comprises high-gain dual-cladding two-dimensional array optical fiber, narrow-band optical fiber grating arrays, a dichroscope or wide-band optical fiber grating arrays, a pump light source (single mode LD or multiple mode LD or both together), an optical fiber isolator, a coupling lens and a wavelength-division multiplexer. The single-frequency optical fiber laser can realize simultaneously output multi-path high-power (>100mW) and ultra-narrow line width (KHz level) single-frequency laser of a single-transverse mode with identical wavelength or different wavelength, and the outputted multi-path single-frequency lasers do not interfere each other. The multiple wavelength output single-frequency optical fiber laser can be applied to the military or space filed which requires high accurate sensing, detection and indication to multiple targets.

The invention provides a surface plasmon electro excitation source, which comprises a first metal layer, a second metal layer, a quantum well layer arranged between the first metal layer and the second metal layer, and a coupling output structure in one of the first metal layer and the second metal layer. The invention also provides a manufacturing method of the surface plasmon electro excitation source.

An antenna element includes an antenna radiator, an antenna dielectric substrate, a grounded metal plate, and a feed structure. The antenna radiator consists of several metal sheet units. The coupled slots between the adjacent metal sheet units form radiation slots and the grounded metal plate has a feed slot which is fed by the feed structure and the radiation slot is fed by the feed slot through coupling. This disclosure also provides an antenna packaging structure. An EBG is deployed as part of the radiator to improve the problems of high profile and narrow bandwidth of the traditional antennas. The EBG radiator also achieves low profile, broadband and high gain characteristics that is very suitable for millimeter wave band AiP and is also suitable for mass production at low cost, and therefore it can be widely used in 60 GHz WiFi system and a 5G millimeter wave communication system.

The invention discloses an array antenna of a circularly polarized dielectric resonator, which can be used in the field of communication. The array antenna of the circularly polarized dielectric resonator comprises a feeder unit and four unit antenna arrays, wherein the four unit antenna arrays comprise four linearly polarized dielectric resonator units with single-end feed; the feeder unit comprises a power divider with a phase-shifting function, an impedance converter and a coupler and can assign equal power for each linearly polarized dielectric resonator unit, and the phase difference of adjacent linearly polarized dielectric resonator units is 90 degrees. The array antenna of the circularly polarized dielectric resonator has the advantages of circularly polarized property, high gain and front-back ratio, simple feed network, easy manufacture, and the like.

The invention discloses a miniaturized high-gain circularly polarized antenna based on a metamaterial. The antenna comprises a feeding connection port, a metal floor, a feeding coaxial line arranged on the metal floor, and a butterfly dipole structure connected with the feeding coaxial line. The butterfly dipole structure comprises a pair of dipole arms symmetrically arranged with respect to the feeding coaxial line, and each dipole arm is vertically connected with a thin plate, and the thin plate is connected to the metal floor. An open resonant cavity structure is formed among the pluralityof thin plates and the metal floor. The antenna can achieve high gain while achieving miniaturization, and is advantageous for scene applications with small size and high gain.

The invention provides a soft surface structure-based patch array antenna, and aims at achieving miniaturization while keeping high gain of the patch array antenna. The soft surface structure-based patch array antenna comprises five dielectric plates which are stacked from top to bottom, wherein a first composite metal band is printed on the first dielectric plate; a second composite metal band and m*n upper radiating elements are printed on the second dielectric plate and each upper radiating element comprises 2*2 upper radiation patches; m*n first plated through holes are arranged in the third dielectric plate, a third composite metal band and m*n lower radiating elements are printed on the upper surface of the third dielectric plate, each lower radiating element comprises 2*2 lower radiation patches and a main radiation patch, an internal grounding plate is printed on the lower surface of the third dielectric plate and m*n feed via holes are etched in each internal grounding plate;the first composite metal band, the second composite metal band and the third composite metal band form a soft surface structure; m*n second plated through holes are arranged in the fourth dielectricplate; and an external grounding plate is printed on the lower surface of the fifth dielectric plate and a feed network is printed on the upper surface of the fifth dielectric plate.

The invention provides a broadband low-sidelobe microstrip antenna array for an anti-collision radar system, relates to a broadband antenna device for the anti-collision radar system, and aims at solving the problems of a narrow working band and a low gain of the broadband low-sidelobe microstrip antenna array. The broadband low-sidelobe microstrip array antenna comprises M*N antenna units, wherein each antenna unit comprises a floor layer, an active radiation microstrip unit layer and a coupled radiation microstrip unit layer; the active radiation microstrip unit layer is fixed on the floor layer; the coupled radiation microstrip unit layer is suspended above the active radiation microstrip unit layer; the active radiation microstrip unit layer comprises a lower substrate and a first antenna array element; the coupled radiation microstrip unit layer comprises an upper substrate and a second antenna array element; the M*N antenna units are fixedly connected in a microstrip line feeding manner; and finally feeding is carried out with a coaxial line of which the characteristic impedance is 50 omega. The broadband low-sidelobe microstrip array antenna has the beneficial effects of being light in weight, easy to integrate, high in gain, low in sidelobe and small and is suitable for the anti-collision radar system in various occasions.

The invention provides an ultra-wide-band low-profile printed-type circularly polarized spiral antenna. The ultra-wide-band low-profile printed-type circularly polarized spiral antenna comprises a first dielectric substrate set to be hollow and cylindrical, a spiral metal sheet arranged on the outer surface of the first dielectric substrate in a spirally-wounded mode, a second dielectric substrate arranged at the bottom of the first dielectric substrate and connected with the first dielectric substrate and a metal grounding plate arranged at the bottom of the second dielectric substrate, connected with the second dielectric substrate and used for grounding, wherein the cross section direction of the second dielectric substrate is perpendicular to the axial direction of the first dielectric substrate. Due to the fact that the width of the spiral metal sheet is adjustable, input impedance of the antenna can be controlled by changing the width of the metal sheet, and an ultra-wide-band impedance band width can be realized at the same time; on the basis of the low-profile feature of the antenna is maintained, the polarized radiation feature and the high-gain characteristic of an ultra-wide band are realized, and the polarized band width can be covered by the impedance band width.

A gain-clamped semiconductor optical amplifier uses the Raman amplification principle. A Raman amplifier and a gain clamped semiconductor optical amplifier are integrated onto an optical amplifier module. The gain-clamped semiconductor optical amplifier includes: an optical fiber having Raman gain characteristics; and a gain-clamped semiconductor optical amplifier for providing a pumping light to the optical fiber by laser oscillation using a distributed Bragg reflector (DBR) lattice. The DBR has input and output terminals asymmetrical to each other, at least for amplifying a signal light Raman-amplified by the optical fiber.

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 provides a high-gain dual-mode broadband circularly polarized antenna. The high-gain dual-mode broadband circularly polarized antenna comprises an antenna radiation portion, a coaxial feed line, a metal chamber and a coaxial joint, the antenna radiation portion comprises a plurality of L-shaped radiators fastened on a dielectric plate, the antenna radiation portion is connected with the coaxial feed line, and the coaxial feed line penetrates through the metal chamber and is connected with the coaxial joint. The high-gain dual-mode broadband circularly polarized antenna is advantageous in that conventional linear orthogonal dipole radiators are replaced by four L-shaped radiators, and the antenna can simultaneously generate two circular polarization work modes so that the circular polarization bandwidth of the antenna can be broadened; the impedance bandwidth is 72.6%, the circular polarization axial ratio bandwidth is 62.5%, and the maximum gain is 12.5 dB; and dual-mode broadband operation of the antenna is realized with the combination of the L-shaped radiators and an annular phase-shift wire, the structure is simple, the design is convenient, single-port feeding is achieved, a complex feeding network is avoided, the characteristic of high gain is achieved, and the application prospect is wide.

The invention discloses a broadband series-feed sparse array antenna unit, which comprises an antenna feed part and an antenna radiation part, wherein the antenna feed part comprises an SMP structure, a strip line matching adjustment and phase adjustment part and metalized isolation columns around a strip line. The antenna radiation part comprises a dielectric layer of the antenna, a radiation patch of the antenna, a parasitic patch and a metallization isolation column. A radio frequency signal is fed into a strip line in the antenna feed layer structure through the SMP structure, the strip line is subjected to one-to-two power distribution, the amplitude is equal, the phase difference is 180 degrees, the radio frequency signal is coupled to an antenna patch in the antenna radiation layer structure through a linear gap in the upper layer ground of the strip line and an air cavity, and radiation of radio frequency energy is achieved. The average distance of the plurality of antenna units is greater than half wavelength of the antenna under the working frequency, and the layout of the antenna patch adopts a comprehensive algorithm of an antenna pattern, so that lobe deletion of the antenna can be prevented, the gain of the antenna can be improved, and the side lobes of the antenna can be reduced.

The invention discloses a metasurface antenna polarization reconfigurable method capable of switching three states of linear polarization, left-hand circular polarization and right-hand circular polarization, and belongs to the technical field of antennas. The antenna comprises a metasurface, a polarization reconfigurable feed structure and a metal floor. The metasurface structure is composed of four square sub-wavelength patch units which are identical in size. The polarization reconfigurable feed structure is composed of a crossed dipole loaded with four PIN tubes and an arrow-shaped dipolejointly formed by two rectangular metal strips placed along the y axis, and a 50-ohm coaxial line is adopted to directly feed the polarized reconfigurable feed structure. According to the antenna, thefeed structure is converted into a corresponding L-shaped dipole form or a metal strip form along the y axis by controlling the conduction and cut-off states of the four PIN tubes, so that linear polarization, left-handed circular polarization or right-handed circular polarization is formed, and the rapid conversion among linear polarization, left-handed circular polarization or right-handed circular polarization can be realized. A metal floor is used for realizing the directional radiation of the antenna. According to the present invention, the metasurface structure is combined with the reconfigurable feed dipole structure, so that the electric reconfigurable design method of the metasurface antenna is realized; and the three-state polarization reconfigurable function of the metasurfaceantenna can be achieved by controlling the on-off of a few PIN switches of the polarization reconfigurable feed structure. Moreover, a novel L-shaped feed structure is provided for generating the circular polarization state, and meanwhile the antenna has the advantages of being compact, being low in profile, high in gain and low in cost, being easy to machine and the like.

The invention provides a circularly polarized antenna comprising a linearly polarized antenna source, a circularly polarized lens and a medium lens, wherein the linearly polarized antenna source is used for radiating linearly polarized waves; the circularly polarized lens includes a circular polarization device which is located above the linearly polarized antenna source and used for converting the linearly polarized waves into circularly polarized waves, the circular polarization device comprises a plurality of dielectric grids which are vertically and parallelly arranged, the plurality of dielectric grids are arranged in sequence along the horizontal direction at equal intervals; and the medium lens is connected above the circular polarization device and is used for refracting and converging the circularly polarized waves. The antenna can be used for 5G mobile communication, so that the wider axial ratio bandwidth is achieved, meanwhile, the gain of the antenna is improved, moreover,the wave beam scanning of the antenna is realized, and the antenna is suitable for the scene of mobile communication such as the fifth generation in the future.

The invention provides a metasurface-based broadband differential antenna. The metasurface-based broadband differential antenna comprises a first dielectric plate, a second dielectric plate and a metal layer attached between the first dielectric plate and the second dielectric plate, wherein a rectangular gap is formed in the metal layer; a circular metal sheet with a gap is attached to the uppersurface of the first dielectric plate, and a metal feeder line is attached to the lower surface of the second dielectric plate; the circular metal sheet with the gap is provided with a first horizontal strip-shaped gap and second horizontal strip-shaped gaps which are arranged on the two sides; the circular metal sheet with the gap is provided with a first vertical strip-shaped gap and second vertical strip-shaped gaps which are arranged on the two sides; the metal feeder line comprises a cross part and two U-shaped parts which are symmetric about the cross section; and the cross-shaped upperend part of the cross part extends into the U-shaped part at the upper end, and the cross-shaped lower end part of the cross part extends into the U-shaped part at the lower end. The metasurface-basedbroadband differential antenna can achieve broadband characteristics and high-gain characteristics.

The differential output of a Programmable Gain Amplifier (PGA) is loaded by the input differential gate capacitance of a plurality of Analog to Digital convertors (ADC) comparators and the differential metal layer traces to interconnect these comparators to the PGA. The differential capacitive load presented to the PGA is quite large and reduces the bandwidth of this interconnect between the PGA and ADC. To overcome the performance degradation due to the differential capacitive load, an active negative-capacitor circuit cancels the effect of the large input capacitance of the ADC comparators. This cancelation extends the gain characteristics of the interconnect between the PGA's output and the inputs of the first stage of the comparators. The active negative-capacitance is comprised of a cross pair NMOS with a capacitor connecting their sources where each NMOS is biased by a current source.

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 provides an ultra-wideband antenna, and the antenna comprises a shell and an antenna main body installed in the shell; the antenna main body comprises a grounding plate, a plurality of radiation units, a spiral impedance conversion line and a coaxial line, wherein the coaxial line is provided with an outer conductor and a shielding layer inner conductor; every two adjacent radiationunits are connected through the spiral impedance conversion line, the outer conductor is connected with the grounding plate, and the shielding layer inner conductor is connected with the radiation units. The invention has the beneficial effects that the ultra wide band antenna achieves good impedance characteristics in the frequency band of 2GHz and 7GHz, the whole radiation field intensity of theantenna is enhanced, and therefore the high gain characteristic of the antenna is achieved.

A large power semiconductor laser with stable light spots successively comprises a substrate, a lower wrapping layer, an active region, an upper wrapping layer and a contact layer from bottom to top. The upper wrapping layer and the contact layer are provided with a ridge-type structure. Channels are formed at two sides of the ridge-type structure. The depth of the channels is smaller than the total thickness of the upper wrapping layer and the contact layer. The part, except the ridge-type structure, on the upper surface of the contact layer and the surfaces of the channels are covered by dielectric films. The dielectric films and the ridge-type structure are covered by a first metal electrode layer. The bottom surface of the substrate is provided with a second metal electrode layer. The first metal electrode layer is sintered on a heat sink, and air isolation layers are arranged between a solder and the bottom parts of the channels. The upper wrapping layer of the laser is relatively thick, the ridge-type structure is prepared, lateral emission paths of heat generated by the active region in work are blocked by the air isolation layers, the heat is vertically emitted mainly through the ridge-type contact layer, so that the refractive index gradients of the middle part of the ridge-type structure and the active region close to the channel parts do not increase with the increasing of generated heat, and near-field light spots are more stable.