9results about How to "Improve insertion loss" patented technology

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.