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

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.