17results about How to "Improve insertion loss" patented technology

The invention relates to an analog active EMI filter with a double-ring structure and a noise suppression verification method. The EMI filter comprises a direct-current power supply, an LISN circuit, a voltage detection circuit, an injection circuit, an amplification circuit and a switching power supply, the direct-current power supply, the LISN circuit, the voltage detection circuit, the injection circuit and the switching power supply are sequentially connected in parallel, the injection circuit comprises a voltage injection branch and a current injection branch connected with the voltage injection branch in parallel, the voltage injection branch and the current injection branch are used for voltage injection and current injection respectively, and the amplification circuit comprises a first anti-phase amplification branch and a second anti-phase amplification branch connected with the first anti-phase amplification branch in parallel. The first anti-phase amplification branch circuit is respectively connected with the voltage detection circuit and the current injection branch circuit to form a first annular structure, and the second anti-phase amplification branch circuit is respectively connected with the voltage detection circuit and the voltage injection branch circuit to form a second annular structure. Compared with the prior art, the method has the advantages of realizing an effective noise interference suppression effect and the like.

The invention relates to the technical field of optical fiber processing, and discloses a multi-core-diameter optical fiber ultrasonic cutting system under uniform stress, which comprises a clamping symmetrical assembly, a horizontal tension driving assembly, an ultrasonic cutting assembly and a cutting knife pushing assembly, an optical fiber is clamped through the cooperation of the pressing plate and the clamping assembly base; the clamping assemblies are slidably connected with the horizontal tension driving assembly, the two clamping assemblies are driven by the horizontal tension driving assembly to move reversely, and horizontal tension is applied to the optical fiber, the ultrasonic cutting assembly is slidably connected with the cutting knife pushing assembly, and the cutting knife pushing assembly is arranged on one side of the clamping symmetrical assembly and located between the two clamping assemblies. The cutting knife pushing assembly drives the ultrasonic cutting assembly to move to cut the optical fiber; the optical fiber cutting device can effectively meet the cutting requirements of optical fibers with different core diameters, the flatness of the cut end face is remarkably improved, and burrs and cracks are reduced.

The invention discloses a circuit board and a preparation method thereof, and an electronic device, the disclosed circuit board comprises a circuit board main body (100) and a via hole structure (200), the circuit board main body (100) is provided with a hole segment (101) and a back drilling hole (102) which are communicated with each other, an orifice of the hole segment (101) is located in a first surface of the circuit board main body (100), and the hole segment (101) is located in a second surface of the circuit board main body (100). The circuit board comprises a circuit board body (100) and a hole section (101), the hole section (101) is provided with a back drilling hole (102), the hole opening of the back drilling hole (102) is located in the second surface of the circuit board body (100), the first surface and the second surface are opposite to each other, the inner wall of the hole section (101) is provided with a metal layer to form the via hole structure (200), the via hole structure (200) is filled with a first filler (300), the back drilling hole (102) is filled with a second filler (400), and the first filler (300) and the second filler (400) are arranged in the via hole structure (200). And the dielectric constant of the second filler (400) is smaller than that of the circuit board main body (100). According to the scheme, the impedance of the via hole structure can be improved.

The invention relates to the waveguide technology and microstrip line technology field of a millimeter wave communication system, and especially relates to a double-layer substrate integrated waveguide resonator based on a loading capacitor paster, which comprises an upper surface metal clad copper, an upper layer dielectric plate, a middle metal clad copper, a lower layer dielectric plate and a lower surface metal clad copper from top to bottom in sequence. The middle metal clad copper comprises a loading capacitor patch, the two sides of the loading capacitor patch are connected with microstrip line feed parts respectively, and the microstrip line feed parts are arranged on the center line of the loading capacitor patch; the upper dielectric plate and the lower dielectric plate are respectively provided with two groups of metal through holes which are periodically arranged, and the center of the loading capacitor patch is provided with a rectangular groove. According to the invention, the intrinsic resonant frequency of the resonator can be controlled, and the resonant mode and the transmission zero point can be controlled, so that the controllable center frequency and bandwidth can be realized.

The invention discloses a multiplexed output radio frequency amplification device, at least one radio frequency input end in the multiplexed output radio frequency amplification device is correspondingly and electrically connected with an input end of a power divider, and two output ends of the power divider are correspondingly and electrically connected with two phase channels respectively. The two phase paths are correspondingly and electrically connected with two input ends of the combiner, and two output ends of the combiner are correspondingly and electrically connected with the two radio frequency output ends. The power divider is used for dividing radio frequency input signals of different radio frequency input ends into different radio frequency signal groups, and each radio frequency signal group comprises two radio frequency signals which are equal in amplitude and have a phase difference of 90 degrees. And the combiner is used for combining the two radio frequency signals of the radio frequency signal group into one radio frequency output signal and outputting the radio frequency output signal through the corresponding radio frequency output end. Therefore, by switching the radio frequency signals in different phase channels, channel selection of different radio frequency output ends is realized, link insertion loss is improved, and the power and efficiency of the multi-output radio frequency amplification device are improved.

The utility model discloses a multifunctional transmission polarization conversion metasurface suitable for an S wave band, the metasurface is provided with a sandwich layered composite structure, the sandwich layered composite structure comprises an upper layer and a lower layer which are metal grid structures integrated with PIN diodes, and a middle layer which is a metal strip array periodically arranged at an inclination angle of 45 degrees, and dielectric substrates are arranged between the upper layer and the middle layer and between the middle layer and the lower layer. The metasurface has broadband working and dynamic reconfigurable characteristics, and has wide application potential in the fields of communication, radar, satellite systems, electronic countermeasures and the like.

The invention belongs to the technical field of millimeter wave photoelectric devices, and particularly relates to a double-line waveguide polarization rotator model design method. The method comprises the following steps: collecting polarization rotation parameters including a target rotation angle, a working frequency band and an insertion loss requirement; the method comprises the steps that simulation software is used for building a geometric model, simulating metal wires and multiple dielectric layers sequentially surrounding from inside to outside, a double-wire waveguide basic model is built, the two metal wires are parallel and not coplanar and form a waveguide structure, ports are set as optical signal input and output ends, the rotation angle and the optimal length of the metal wires are adjusted, and a three-dimensional simulation model is built; after mode analysis verification, a model entity is obtained through 3D printing, the polarization state and the polarization extinction ratio are tested, and the performance is evaluated; and finally, iterative optimization is carried out until the optimal rotation angle is obtained. The method supports flexible regulation and control of the polarization rotation angle, the influence of external factors on the performance is small, efficient and accurate control over the light polarization state can be achieved, and the method is suitable for the fields of terahertz communication, imaging and the like.

The invention discloses a differential-mode active EMI filter and system for current sampling and current compensation, and belongs to the field of active EMI filters, the differential-mode active EMI filter comprises an injection circuit, the input end of the injection circuit is connected with a direct-current bus, and the connection point is located between an LISN and a bus supporting capacitor; the current-limiting auxiliary inductor is connected in series with the direct-current bus and located between the direct-current bus and the direct-current bus; the sampling circuit is used for sampling an EMI interference source current between the sampling circuit and a bridge arm of the power electronic converter and carrying out integration processing on a corresponding induced voltage to obtain a voltage signal; the signal processing circuit is used for eliminating the direct-current bias and then adjusting the direct-current bias to be matched with the direct-current bias to obtain injection voltage; the power amplification circuit is used for amplifying power to obtain injection voltage; and the injection circuit is used for converting the current into matched injection current and injecting the injection current into a direct-current bus to realize direct-current side differential mode EMI suppression. According to the invention, the insertion loss can be improved, and the suppression effect of direct-current side differential mode EMI is improved.

The embodiment of the invention provides a ceramic substrate, a composite piezoelectric substrate, an electronic device and a module, the ceramic substrate comprises a ceramic material base body, and the ceramic material base body is provided with a first surface and a second surface which are opposite to each other; a doping layer which extends by a preset thickness from the first surface to the direction gradually close to the second surface is formed in the ceramic material matrix; the doping layer comprises a target doping element doped in the ceramic material matrix, and the doping concentration range of the target doping element in the doping layer is 1 * 10 < 17 > ions / cm < 3 > to 5 * 10 < 20 > ions / cm < 3 >. According to the elastic wave device provided by the embodiment of the invention, the Q value can be improved, and the insertion loss can be improved.

This utility model discloses a passive signal filter for processing fire signal transmission in shielded rooms, belonging to the field of electromagnetic shielding technology. It includes paths A-A′ and B-B′; both paths A-A′ and B-B′ are equipped with cascaded common-mode suppression modules and differential-mode suppression modules. The common-mode suppression module consists of two common-mode chokes L1 and two feedthrough capacitors C1, while the differential-mode suppression module is a π-type low-pass filter structure composed of a differential-mode inductor L2 and a feedthrough capacitor C2. Through this method, this utility model possesses high reliability and safety, high signal fidelity, excellent electromagnetic compatibility, and high integration.

The embodiment of the utility model discloses a radio frequency unit and a radar assembly, a first body and a second body are oppositely combined together, and a waveguide cavity comprises a first waveguide port, a second waveguide port and an extension section connected between the first waveguide port and the second waveguide port. Therefore, the extension interval is configured to be the multi-stage power divider group, the insertion loss of the radio frequency unit in a relatively high frequency band is improved, and the signal receiving and transmitting precision of the radio frequency unit is improved.

The application discloses a matching structure for a coaxial TSV-RDL transition area, comprising a silicon substrate, the upper and lower ends of the silicon substrate are respectively provided with a silicon dioxide isolation layer, the center of the silicon substrate is provided with a coaxial TSV, the upper end of the coaxial TSV is connected with an upper layer RDL signal transmission component, and the lower end of the coaxial TSV is connected with a lower layer RDL signal transmission component. S 11 、 S 21 The transmission characteristics of the matching structure designed by the application are improved.

The invention provides an all-pass phase shifter. The phase shifter comprises a first all-pass phase shifting unit and a second all-pass phase shifting unit, wherein the frequency points of the first all-pass phase shifting unit and the second all-pass phase shifting unit are different; each of the first all-pass phase shift unit and the second all-pass phase shift unit comprises a plurality of inductors connected in series; the inductor comprises a wire wound in the circumferential direction. One inductor of the first all-pass phase shift unit is coupled with one inductor of the second all-pass phase shift unit, and the other inductor of the first all-pass phase shift unit is coupled with the other inductor of the second all-pass phase shift unit; and in the mutually coupled inductors, the projections of the areas enclosed by the outer contours of the respective outermost leads in the lamination direction of the metal layers are at least partially overlapped. The phase shifter is high in phase flatness, wider in working bandwidth, small in area and high in integration level.

The application provides a millimeter wave wide-angle scanning integrated antenna array structure, which comprises an antenna array body with a working frequency range of 24-33 GHz, wherein the antenna array body is composed of a plurality of metal claddings in a specific arrangement mode, and the antenna array body further comprises a substrate and a mounting leaf. The side plates arranged on both sides of the antenna unit can mount the antenna unit to the outside of the threaded rod, the antenna unit can be limited through bolts, the connecting plate can be telescoped on the top of the substrate through the telescoping action of the electric telescopic rod, the movable rod mounted on the top of the connecting plate can move up and down, the top plate arranged on the top of the movable rod can extrude the flexible plate, the sliding sleeve arranged on both sides of the flexible plate can slide along the outside of the sliding rod during the force receiving process at the bottom of the flexible plate, the flexible plate can be bent, and the antenna unit can be formed into a convex shape, so that the scanning performance of the antenna array can be continuously improved to meet the use requirement.

The invention discloses a radio frequency front-end module. A switch unit group in the radio frequency front-end module comprises at least one bypass switch. The transmitting channel comprises an output matching unit, and the receiving channel comprises an input matching unit. And the transmitting channel is electrically connected with at least one receiving channel through the switch unit group. And the radio frequency front-end module is used for switching the working mode of the radio frequency front-end module to be transmitting channel working or receiving channel working through mutual cooperation of the switch unit group, the input matching unit and the output matching unit. Therefore, the switch unit group comprises at least one bypass switch, the switch unit group is combined with the original input matching unit and output matching unit to realize switching of different channels, and compared with a mode of realizing switching of different channels by adopting a plurality of tandem switches in the prior art, the arrangement number of the tandem switches can be reduced, and the switching efficiency is improved. Therefore, the link insertion loss is improved, and the performance is improved.

The utility model relates to the technical field of communication, and provides a filter which comprises a cavity, a first resonant part, a second resonant part and a conductive assembly, the cavity is provided with a first resonant cavity and a second resonant cavity, and the first resonant part and the second resonant part are respectively installed in the first resonant cavity and the second resonant cavity. The distance between the first resonance part and the second resonance part is larger than or equal to two times of the diameter of the first resonance part or the second resonance part, and the conductive assembly is connected with the first resonance part and the second resonance part so that the first resonance part and the second resonance part can be coupled. Therefore, the first resonant part and the second resonant part which are far from each other can be coupled through the conductive assembly, so that the first resonant part and the second resonant part can be flexibly arranged far from each other, the cavity arrangement is more flexible, the free space of the cavity is fully utilized to accommodate the first resonant part and the second resonant part, and the space utilization rate of the cavity is improved; therefore, the insertion loss, suppression and power performance of the filter is improved.

The invention provides a broadband receiving radio frequency front-end structure, which is characterized in that when the output of a power supply control module is power supply voltage Vdd, the output of an output bias control module is power supply voltage Vdd, the output of an input bias module is bias voltage Vb, and the output of a grounding control module is a grounding end GND, the structure is in a low-noise amplifier working mode; when the output of the power supply control module is a grounding end GND, the output of the output bias control module is a power supply voltage Vdd, the output of the input bias module is the power supply voltage Vdd, and the output of the grounding control module is the grounding end GND, a through switch receiving working mode is realized; when the output of the power supply control module is a power supply voltage Vdd, the output of the output bias control module is a grounding end GND, the output of the input bias module is the grounding end GND, and the output of the grounding control module is the power supply voltage Vdd, the broadband receiving radio frequency front end structure is in a diversity receiving switch turn-off working mode. According to the invention, system complexity can be improved, space and cost can be saved, power consumption and radio frequency signal chain paths can be optimized, and insertion loss and noise characteristics can be improved.