38results about How to "Reduce return loss" patented technology

Apparatus and methods according to examples of the present invention include providing an electrical interconnection between an RF circuit and an antenna, the electrical interconnection including a transition via through an antenna substrate. The electrical connection can be configured so as to provide low losses.

The invention discloses a light module, which includes a casing and a fiber adapter located at one end of the casing. The casing internally includes a laser chip, a first filter sheet, a reflection sheet, a second filter sheet, a reflective prism assembly, and a light receiving chip. The light signal emitted by the laser chip enters the fiber adapter through the first filter sheet and is emitted;the light signal from the fiber adapter is reflected by the first filter sheet and the reflection sheet and is emitted to the reflective prism assembly through the second filter sheet; the light incoming surface of the reflective prism assembly and the propagation direction of the light signal present a non-vertical angle; the non-vertical angle can reduce the return loss of the received light; the tail end surface of the reflective prism assembly is an oblique reflective bevel, the light signal is propagated to the reflective bevel and is reflected and is then emitted to a light outgoing bottom surface and is received by a light receiving chip below the light outgoing bottom surface. Thus, according to the light module provided by the invention, the light incoming surface of the reflective prism assembly is subjected to inclined treatment, the return loss of the received light can be reduced, influences on light signal transmission are further reduced, and the light coupling effects are ensured.

A radome for an antenna is provided as a composite of an isotropic outer layer and a structural layer of foamed polymer material. The composite is dimensioned to enclose an open end of the antenna. The radome may be retained upon the antenna by a retaining element and fasteners. The outer layer may be a polymer material with a water resistant characteristic.

A radome for an antenna is provided as a composite of an isotropic outer layer and a structural layer of foamed polymer material. The composite is dimensioned to enclose an open end of the antenna. The radome may be retained upon the antenna by a retaining element and fasteners. The outer layer may be a polymer material with a water resistant characteristic. The structural layer may project inward and/or outward with respect to a plane of the seating surface of the radome.

The invention discloses a method for identifying and positioning an abnormal sound position of an aero-engine, which is used for accurately positioning the position where the aero-engine generates theabnormal sound. The method comprises the following steps: respectively mounting sensors at multiple positions of the aero-engine; acquiring an abnormal sound signal; performing format conversion on the acquired abnormal sound signal; and analyzing and processing the abnormal sound signal after conversion format so as to determine the accurate abnormal sound position. The method and a system for identifying and positioning the abnormal sound position of the aero-engine provided by the invention can avoid the situation that the aero-engine returns to the factory for repair due to wrong judgment, reduce unnecessary return loss, greatly reduce the maintenance cost of the aero-engine, and greatly improve the maintenance efficiency of the aero-engine.

The invention relates to an energy-saving and environment-friendly double-backflow type swimming pool, and belongs to the technical field of physical fitness facilities. The swimming pool comprises a swimming pool body and a backflow duct, wherein the swimming pool body comprises a rectangular pool wall, and the backflow duct is located on the periphery of the swimming pool body. A set of parallel diversion pipes are arranged on a part of the pool wall, wherein the part is located at the end, in the length direction, of the swimming pool body. A set of parallel backflow pipes are arranged on a part of the pool wall, wherein the part is located at the other end, located in the length direction, of the swimming pool body. A propeller driven by a propeller shaft is arranged in each diversion pipe. The outer end of each propeller shaft is connected with a corresponding drive motor in a transmission mode, wherein the corresponding drive motor is arranged outside the backflow duct. Preset swirling flow pieces are fixed to the inlet ends of the diversion pipes, wherein the number of the preset swirling flow pieces is the same as the number of propeller wing pieces. A rectification grating is arranged at the outlet ends of the diversion pipes. The preset swirling flow pieces are in the spiral shape in the direction opposite to the direction of the propeller. By means of the energy-saving and environment-friendly double-backflow type swimming pool, water flow entering the diversion pipes can deflect by a certain angle in advance to offset the water flow deflection angle generated when the propeller rotates, and can then be rectified by the grating, so that water flow stable and consistent in output flow direction is output through the diversion pipes, and the comfort degree in the reverse-flow swimming process is ensured.

A filter includes a series arm resonant circuit connected between input/output terminals, and a parallel arm resonant circuit connected between a node on a path connecting the input/output terminals and ground. The series arm resonant circuit includes a series arm resonator having a band width ratio wider than the band width ratio of the parallel arm resonant circuit and a capacitor connected to the series arm resonator.

A feeding apparatus includes a substrate, an annular grounded metal sheet having a first opening and a second opening, a rectangular grounded metal sheet extending from the annular grounded metal sheet toward an interior according to a configuration of a septum polarizer of a waveguide, a first parasitic grounded metal sheet extending from a side of the rectangular grounded metal sheet along a first direction, a second parasitic grounded metal sheet extending from another side of the rectangular grounded metal sheet along a second direction, a first feeding metal sheet extending from the first opening toward the interior and including a first portion, a second portion and a third portion and a second feeding metal sheet extending from the second opening toward the interior and including a fourth portion, a fifth portion and a sixth portion.

The invention relates to a wet-type dust falling fan impeller. The fan impeller comprises a wheel hub (1), and is characterized in that blades (2) are uniformly distributed on the periphery of the outer cylindrical surface of the wheel hub, the wheel hub and the blades are of an integrated structure, the wheel hub and the blades are made of aluminum alloy materials, and the wheel hub and the blades are formed in a pressure casting mode. The wet-type dust falling fan impeller has the advantages of being light in weight, resistant to corrosion, stable and compact in structure, good in pneumaticperformance and high in dust falling efficiency.

A printed antenna includes a feed portion and a radiating portion. The feed portion feeds electromagnetic signals, and includes a feed end and a connection end. A width of the feed portion is gradually increased from the feed end to the connection end. The radiating portion includes a first radiator and a second radiator. The first radiator is elongated, and connects to the connection end of the feed portion. One end of the second radiator is connected to the first radiator, and the other end is free. The free end is bend and bent along the feeding portion, and defines a slot between the second radiator and the first radiator and the feeding portion.

The present invention discloses a high frequency data cable of 1200 MHz. The high frequency data cable of 1200 MHz comprises a cable core unit, and the cable core unit includes four shielding subunits; each shielding subunit includes a pair of stranded wires with stranding pitches, each pair of stranded wires with stranding pitches consisting of two insulated single lines with different colors and high foaming; a low smoke zero halogen flame retardant polyolefin outer sheath coats a cable core unit; the cable core unit and the low smoke zero halogen flame retardant polyolefin outer sheath coat a single-face plastic-coated aluminum foil shielding layer and a braided prismatic tinned wire shielding layer in turn from the inside out. Through adoption of a copper wire polishing technology and an insulated wire core back-twist technology, the return loss of cables caused during transmission is reduced; through adoption of insulated single lines with high foaming, the transmission loss of cables is reduced, and transmission rate is enhanced, so that the requirement of 1200MHz high frequency transmission is satisfied; and moreover, through adoption of the modes of wire pair shielding, the aluminum foil shielding and tinned wire braiding shielding and the unique shielding technological structure of each shielding layer, the signal quality is improved.

The invention discloses a dielectric resonator antenna and a terminal. The dielectric resonator antenna comprises a dielectric substrate and a dielectric resonator arranged on the dielectric substrate; the substrate is provided with a coupling gap, a parasitic gap and a feeder, and the dielectric resonator antenna is characterized in that the coupling gap is a first opening gap; the parasitic slot is a second open slot; the opening direction of the first opening gap is opposite to the opening direction of the second opening gap. According to the dielectric resonator antenna, the coupling slot is the first opening slot, the parasitic slot is the second opening slot, and the opening direction of the first opening slot is opposite to the opening direction of the second opening slot. The first opening gap coupled with the feeder line is used for feeding, high-frequency signals on the feeder line are introduced into the rectangular dielectric resonator, the second opening gap is used for guiding surface current, and finally a needed resonant mode is generated through the rectangular dielectric resonator.

The invention discloses an optical module which comprises a circuit board and an optical transceiver sub-module electrically connected with the circuit board. The optical transceiver sub-module comprises a round square tube body, and an optical transmitter, an optical receiver and an optical fiber adapter which are embedded into the round square tube body. The optical fiber adapter comprises a tube shell and an optical fiber ferrule arranged in the tube shell. The optical fiber ferrule includes an optical fiber. The first end of the optical fiber is bonded with the first end of the glass sheet through refractive index matching glue. In the application, the constraining forces of the glass sheet and the optical fiber on the optical signal are different, and when the incident light enters the first end of the glass sheet, the incident light is emitted. The first end of the optical fiber is bonded with the glass sheet, equivalently, the distance from the incident light to the reflecting surface is increased, and when the incident light is reflected at the second end of the glass sheet, the reflected light is emitted to the edge of the glass sheet, so that the reflected light cannot return along the original path, and the light return loss can be effectively reduced. Only one glass sheet needs to be bonded at the first end of the optical fiber, and special arrangement of an optical path is not needed, so that the complexity of an optical system and a mechanical structure is effectively reduced.

The invention provides a terminal structure for an RJ connector. The terminal structure comprises a base and eight terminals. The eight terminals include a first terminal, a second terminal, a third terminal, a fourth terminal, a fifth terminal, a sixth terminal, a seventh terminal and an eighth terminal. One end of each terminal has a contact part respectively. The contact parts are arranged adjacent to each other. The other end of each terminal is bent to form an insertion part, and the insertion parts are inserted into the base. The distance of the insertion parts of the third and the sixth terminals is less than the distance of adjacent contact parts. The invention further provides an RJ connector module and an RJ connector system. With the terminal structure provided in the invention, the crosstalk interference and insertion loss inside a connector can be reduced, so that the signal resolution and accuracy are improved.

The invention relates to a kind of parallel body-connected series centrifugal pump. It belongs to a water pump. It includes pump shell, pump supporting frame, pump shaft cover-mounted on the pump supporting frame and connected with power device and bearing cover-mounted on the pump shaft and matched with pump supporting frame. Besides, it also includes the components of water inlet, water intake section, water intake cavity, water outlet, water discharge section, water discharge cavity and blade wheel, etc. Said invention also provides the concrete structure of the above-mentioned every component and their connection method.

A terminal circuit is applied to a bi-directional coupler. The terminal circuit includes a transmission line having a first end and a second end, a first resistor connecting the first end and a first ground and a second resistor connecting the second end and a second ground. A resistance value of the first resistor is substantially identical to that of the second resistor.

The invention relates to a matching paste-free on-site optical fiber quick connector and a connection method. An optical fiber joint piece and an insertion core assembly pre-embedded in the optical fiber joint piece are connected with an on-site rubber-covered wire optical cable, and a first optical fiber of the insertion core assembly has an end face subjected to surface pretreatment. The connection method comprises the following steps of: S1, carrying out surface pretreatment on the end surface of the first optical fiber of the insertion core assembly, and then pre-embedding the first optical fiber in the first end of the optical fiber connector; and/or S2, performing surface treatment on the end face of a second optical fiber of the rubber-covered wire optical cable on site, and then guiding the second end of the optical fiber joint piece to be butted with the first optical fiber of the insertion core assembly. According to the matching paste-free on-site optical fiber quick connector and the connection method, the pre-embedded optical fiber and the on-site optical fiber can be in butt joint for optical signal transmission under the condition of no matching paste, and the purpose of completing optical fiber cold connection without the optical fiber matching paste is achieved.

The invention relates to a multi-core optical fiber connector, which includes a plug, an adapter and several optical fibers connected to the plug. Each optical fiber is provided with an independent ferrule, and the end surface is ground into a spherical surface. The ferrule is fixed on a tailstock. The adapter is provided with several docking boxes for connecting optical fibers, each of which is fixed with a guiding device for ensuring the accuracy of butt jointing of the fiber ferrule, and the plug includes fixing parts for arranging several optical fibers and locking and fixing There are several cavities corresponding to the docking box of the adapter in the fixed part, and each ferrule protrudes from the cavity of the fixed part and connects to the guide device of the adapter. In the multi-core optical fiber connector of the present invention, the docking of the several optical fibers does not affect each other, and the docking is completed independently, and the optical fibers are connected by a spherical surface, which can greatly improve the light guiding performance of the optical fiber connector and reduce the insertion loss and echo of the optical fiber Loss, and can improve space utilization in dense fiber connection occasions.

A high-pressure fuel pump includes an outlet valve, a valve ball, a valve spring that acts on the valve ball in a closing direction, and a stop body for the valve ball. The stop body has a stop section that limits the opening stroke of the valve ball, and the valve spring is supported by the stop body. The stop body has a cut-out section that at least partially accommodates the valve spring and that has a radial inner periphery which forms a guide for the valve spring.