63results about How to "Increase the withstand power" patented technology

The invention discloses a tunable ytterbium-doping double-clad fiber mode-locked laser which belongs to the technical field of lasers. The tunable ytterbium-doping double-clad fiber mode-locked laser is in an annular cavity structure, takes a large-core diameter double-clad ytterbium-doping fiber as a gain medium and works on a total positive dispersion area. The tunable ytterbium-doping double-clad fiber mode-locked laser realizes the mode locking self-starting and stably carries out mode locking by dint of a nonlinear polarization rotation technology and a spectrum filter, is adjustable in filtering bandwidth because the spectrum filter comprises a grating and a slit with adjustable width, has a tuning function and can continuously tune the center wavelength of an output pulse within a gain bandwidth range. The tunable ytterbium-doping double-clad fiber mode-locked laser disclosed by the invention realizes the total positive dispersion mode locking of the large-core diameter double-clad fiber by adopting nonlinear polarization rotation and a spectrum filter technology, obtains the ultrashort-pulse laser output supporting high power and high single-pulse energy, is continuously tunable in center wavelength and is convenient to operate and large in tuning range by composing the spectrum filter by adopting the grating and the slit.

The invention relates to a Faraday polarization apparatus, which belongs to an optical passive device and is used for rotating the polarization direction of light according to the direction of a magnetic field. The Faraday polarization apparatus comprises a compound magnet, and fixing and adjusting parts, wherein the compound magnet is formed by clamping a central magnet block (5) with two groupsof cylindrical magnet units respectively comprising n first fan-shaped magnet blocks (4) and n second fan-shaped magnet blocks (6) in a magnetic shielding sleeve (7) with high magnetic permeability; the compound magnet is pressed tightly by an end cover (2) after being arranged in a casing (9); and a magnetic rotation rod sleeve (8) fixed with a magnetic rotation rod (3) is positioned in an innerhole of the compound magnet, both ends of the magnetic rotation rod sleeve are clamped by two adjustment sheets (1), and the relative position of the magnetic rotation rod (3) and the compound magnetcan be adjusted by adjusting the two adjustment sheets (1) at two ends simultaneously to achieve the aim of adjusting an rotation angle.

The invention belongs to the technical field of data link wireless communication, in particular to a dual-antenna radio frequency front-end module based on the principle structure of the internal dual-antenna working mode of a full-duplex radio frequency front-end. In this module, the output power of the upper and lower antennas at a certain frequency point is controlled by phase shifter, and thetransmit power is synthesized by phase shifter. All the frequency points covered by the upper and lower antennas are distinguished by two different groups of cavity filters in the form of high and lowbands. The filters in high and low bands have a high degree of suppression and can achieve full-duplex operation. In the receiving part of the high-power limiter can ensure that in the antenna port open state, when the high-power signal is totally reflected, the receiving circuit can be protected, and the high-power signal is reflected to the load port. The limiter is used to prevent high power signals from entering the receive link and to protect the receive channel components.

The invention provides an ultrathin loudspeaker which comprises a flower file, a voice coil arranged in the flower file, and a lead board arranged at the back surface of the flower file, wherein the periphery of the flower file comprises at least two through holes which are internally provided with a fixed pad respectively, and leads respectively pass through the fixed pads to be connected with the voice coil and the lead board. In the ultrathin loudspeaker, the fixed pad causes the leads not to collide with the through holes (ventilation window) of the flower file or a centering support chipto generate abnormal voice, and not to generate short circuit due to collision and abrasion, thus improving the fatigue resistance strength of the leads, increasing the power acceptance capability ofthe loudspeaker, prolonging the service life of the loudspeaker, and improving the safety factor; in addition, the service life of a whole LCD TV installed with the loudspeaker is also greatly prolonged.

The invention discloses a low-frequency high-power resonator and an electrically tunable band stop filter with the low-frequency high-power resonator. The low-frequency high-power resonator comprises an outer conductor, an inner conductor, a tuning post and a medium support, wherein the inner conductor is fixedly arranged at the bottom of the outer conductor, and the top of the outer conductor is provided with a groove; a finger-type reed of a beryllium bronze material is arranged in the groove; the tuning post extends into the inner conductor from the groove and is in elastic short-circuit contact with the finger-type reed; the inner conductor is a hollow metal column and is in electric contact with the outer conductor, and the middle lower part of the outer wall of the inner conductor is provided with a hollow spiral track groove; the outer wall of the inner conductor is provided with two layers of convex grooves; the medium support is vertically crossed with the inner conductor and is fixedly arranged in the two layers of convex grooves in the outer wall of the inner conductor. The high-frequency electrically tunable band stop filter consists of an input interface, an output interface and more than one electric tuning unit which are connected in sequence. Electric frequency change of the band stop filter is realized, and the requirements of small size, wide tuning frequency range and high power at an ultralow frequency band can also be met.

The invention discloses an AC power supply management and environment monitoring device for an automatic testing system, and specifically relates to the technical field of AC power supply management testing system monitoring. The device comprises main units, wherein each main unit is connected with a plurality of slave units. Each main unit is provided with a main communication unit, and each slave unit is provided with a slave communication unit. The main communication units and the slave communication units are employed for achieving the bus communication between the main units and the slave units. Each main unit comprises a main controller which is connected with a man-machine interaction unit and a switching strategy management unit. Each slave unit also comprises a slave controller which is connected with a sensor unit and an on / off management unit, wherein the on / off management unit is provided with a contactor. The main units and the slave units employ a PLC as the control core, so the device is high in stability, is high in environment adaptability, and can provide a main control function stably.

The invention discloses a loudspeaker with optimized audio frequency, belonging to the technical field of loudspeakers. The essential technical scheme is that the loudspeaker with the optimized audio frequency comprises an annular magnet, a T-iron and a voice coil, wherein the lateral side of the annular magnet comprises at least three groups of interpole coils for producing complementary field, and the magnetic field produced by each group of the interpole coils basically has the same intensity and is evenly distributed along the lateral side of the annular magnet. The invention has simple structure, can improve loudspeaker acoustic effect, and is used in audio signal playing.

The invention relates to a coaxial high power ferrite circulator. The coaxial high power ferrite circulator includes a device body, wherein three ports for mounting waveguide coaxial converters are arranged at the side surface of the device body; the three ports are concaved and extended inward to be mutually communicated to form a Y-shaped waveguide cavity; a first ferrite, a pad and a second ferrite are arranged at the center of the Y-shaped waveguide cavity from top to bottom successively; the first ferrite and the second ferrite are each provided with three lugs respectively pointing to the three ports; each lug is provided with a partition piece; the upper and lower surfaces of the device body are each provided with a groove; and permanent magnets are arranged in the grooves. By means of the Y-shaped waveguide cavity and the waveguide coaxial converters, the bearing power of the coaxial high power ferrite circulator can be improved. By means of the partition pieces, microwave matching between the ferrites and each waveguide coaxial conversion can be obtained while the size of the Y-shaped waveguide cavity can be compressed and the volume of the device body can be reduced. The coaxial high power ferrite circulator removes the center conductor of a traditional coaxial circulator, and can improve the capability, of bearing the microwave power, of the circulator.

A switch circuit includes: first, second, and third input-output terminals; a transistor (T1) connected between the first and second input-output terminals (P1) and (P2); a transistor (T2) connected between the third input-output terminal (P3) and a grounding point; a transistor (T3) connected between the first and third input-output terminals (P1) and (P3); a transistor (T4) connected between the second input-output terminal (P2) and the grounding point; a first control voltage applying terminal (V1) connected to control terminals of the first and second switching elements (T1) and (T2) ; a second control voltage applying terminal transistor (V2) connected to control terminals of the third and fourth switching elements (T3) and (T4); first and second resistors (R1b, R2b) connected between the control terminals of the first and second switching elements (T1) and (T2) and the first control voltage applying terminal (V1), respectively; and first and second diodes (D1, D2) connected in parallel with the first and second resistors (R1b, R2b), respectively, and having cathodes connected to the first control voltage applying terminal (V1).

The invention discloses a hollow-solid composite multi-core photonic crystal fiber and a laser amplifying method thereof. The fiber comprises a protection layer, a covering layer and a fiber core successively from exterior to interior. The fiber core comprises a solid gain fiber core and a hollow fiber core. The covering layer and the hollow fiber core form a structure which is the same as a hollow photonic crystal fiber. According to the invention, by combining the hollow photonic crystal fiber and a multi-core photonic crystal fiber, and combining the high damage threshold of the hollow photonic crystal fiber and the nonlinear beam combination of the multi-core photonic crystal fiber, advantages of them are completely kept; use restriction of them is overcome; laser energy will not be restrained by the damage threshold of the multi-layered photonic crystal fiber; and the single-module laser pulse peak power is amplified and output to the GW level or the average power is amplified and output to the 100kW level.

The invention relates to an E-type patch based horizontally-polarized digital television transmitting antenna array. The transmitting antenna array comprises a horizontally-polarized antenna unit, an equivalent-power-division in-phase feed network, a patch connector and an input connector; the horizontally-polarized antenna unit is formed by two laminated patch radiation units in a flushed in-phase arrangement; the laminated patch radiation unit comprises a rectangular parasitic patch top layer, a rectangular parasitic patch second layer, an E-type patch and a floor plate; the equivalent-power-division in-phase feed network is positioned between the E-type patch and the floor plate, and connected with the E-type patch through the patch connector; and an outer conductor of the input connector is fixed in the floor plate while the inner conductor of the input connector penetrates through the floor plate to be connected with the equivalent-power-division in-phase feed network. By adoption of the laminated structure and the E-type patch, the impendence bandwidth and the bearing power of the antenna are improved so as to satisfy the operating requirements of ground television broadcasting transmitting systems; and the E-type patch based horizontally-polarized digital television transmitting antenna array has the characteristics of wide working frequency bandwidth, high gain, low standing-wave ratio, high bearing power, simple process, convenient debugging and the like.