117results about How to "Improve return loss" patented technology

The invention provides an antenna device used on wireless equipment. In the purpose of improving the matching of an antenna which is provided with a main antenna element and a parasitic antenna element, the antenna of the invention comprises a main antenna element and a parasitic antenna element; the main antenna element and the parasitic antenna element are separated and a matching unit is arranged therebetween. One end of the matching unit is electrically connected on the conductor band of the main antenna element and the other end is electrically connected on the conductor band of the parasitic antenna element. Optimum antenna characteristic can be obtained by adjusting the position and the numerical value of the matching unit.

The invention relates to a quick pre-buried optical fiber connection device. The device comprises a wheel handle (1), a pre-buried optical fiber (2), a nominal aperture insertion core (5) and a bushing (6); an opening (3) is formed on the insertion core (5); a conical guide opening (4) is formed at one end of the opening (3); one end of the pre-buried optical fiber (2) is placed in the opening (3) of the insertion core (5) and butted with an optical fiber to be butted, and the other end of the pre-buried optical fiber (2) is placed on the end face of the insertion core (5) and polished to be a standby; a space retained in an inner hole of the bushing (6) is used for keeping a tiny bent state of the optical fiber to be butted and has a function of locking the optical fiber to be butted; and matching liquor (8) is prepared in the opening (3). During use, the optical fiber to be butted (7) enters the opening (3) of the insertion core (5), where the insertion core (5) and the pre-buried optical fiber (2) are butted, through the bushing (6). The connection device has a simple structure, low production cost and simple and quick operation, guarantees the butting precision of the optical fiber to be butted, effectively reduces insertion loss of joints and increases echo loss.

The invention discloses an in-situ preparation method of a multilayer core-shell nano-structure and use thereof in preparation of an electromagnetic wave absorbing material. The in-situ preparation method of the multilayer core-shell nano-structure includes: adding molysite and doped other metal salt to a liquid high boiling point solvent, rapidly and instantaneously achieving a nucleation and crystallization effect through thermal injection of an alkaline solution, and acquiring a ferrite core; using the ferrite core as a seed, and coating the ferrite core with an oxide nano shell layer and apolymer or amorphous oxide shell layer by injecting the metal salt and a surfactant; and successively repeating the injection coating step, and in-situ-preparing and growing a multilayer oxide / polymer core-shell composite nano-structure. The in-situ preparation method is simple to operate, is controllable in process, is low in cost, and is short in time; and the multilayer core-shell nano-structure is even in size, is small in particle size, is high in chemical stability, and is used for preparing the electromagnetic wave absorbing material.

The invention relates to an optical fiber rapid cold connective device which comprises a hollow pipe (1) and a pressed block (4), wherein the hollow pipe (1) is a nominal aperture hollow-core pipe; the middle part of the hollow pipe (1) is provided with an opening so as to form a C-shaped groove (2); both ends of the central hole of the hollow pipe are provided with a conical guiding opening (3); and when the device is used, the pressed block (4) is arranged in the C-shaped groove (2). The bonding point of the optical fiber to be connected is arranged in the middle part of the C-shaped groove (2) of the hollow pipe. The connective method is characterized by simple structure, low cost and simple and rapid operation. The optical fiber rapid cold connective device is suitable for connecting the optical fibers in various environments, increases the matching degree of the optical fibers to be connected, effectively reduces the insertion loss of an adapter connector and increases the return loss.

An electromagnetically driven dislocation-type micromechanical variable light attenuator is composed of electromagnetic drive coil, base, two optical fibres, locating slot, movable platform, magnet and elastomer. Its advantages are simple structure, low insertion loss (lower than 1 db), high echo loss (greater than 60 db), wide dynamic range (greater than 50 db), and low cost.

The present invention relates to a mechanical optical switch which is mainly used in optical communication system, optical fibre network system, optical fibre measurement system or instrument and optical signal exchange in optical fibre sensing system. Said invention incldues fixed prism and collimator gripper directed at oblique plane of fixed prism. All the two outgoing collimators and one incoming collimator or two incoming collimators are mutually parallelly placed in same collimator gripper along central axis. It also possesses a movable prism, said movable prism is controlled by relay, and can be moved into or moved out of the optical circuit. The movable prism and fixed prism are isosceles rectangular total reflection prism, and the oblique plane is incident face of light, and saidincident face is coated with anti-reflection film, and two rectangular plane are reflecting plane, and two rectangular crest lines of movable prism and fixed prism are mutually perpendicular in the optical circuit. Its switching time is short, and its typical switching time can be 6 ms.

The invention provides a microstrip antenna based on an artificial magnetic conductor. The microstrip antenna comprises a triangular microstrip antenna and an artificial magnetic conductor reflectionsubstrate, and the triangular microstrip antenna is arranged in a position 0.1mm over a central position of the artificial magnetic conductor reflection substrate by being supported by a non-metal insulated column; the triangular microstrip antenna comprises a triangular radiation patch, a dielectric layer and a grounding plate arranged sequentially from top to bottom, the shape and size of the grounding plate correspond to those of the triangular radiation patch respectively, a complementary resonant ring structure is etched in a central position of the triangular radiation patch, a coplanarwaveguide feed point is arranged in the central point position of the bottom side of the triangular radiation patch, and the edge of the triangular radiation patch is provided with air vents penetrating the antenna at equal interval except the feed point; and the artificial magnetic conductor reflection substrate is formed by splicing artificial magnetic conductor reflection units arranged in a 3*3 array, and the shape and size of the artificial magnetic conductor reflection unit correspond to those of the dielectric layer respectively. The microstrip antenna is simple in structure, easy to process and characterized by being mini and high in gain.

The invention discloses a photoelectrical composite data cable of a star structure. The photoelectrical composite data cable comprises an optical fiber unit, a first communication stranded wire pair, a second communication stranded wire pair, a first electric stranded wire pair, a second electric stranded wire pair and a pentagonal start framework. Four first copper conductors wrapped with insulating layers are stranded into the first communication stranded wire pair and a second communication stranded wire pair in a pairwise stranded mode for information communication. Four second copper conductors wrapped with insulating layers are stranded to form the first electric stranded wire pair and the second electric stranded wire pair in a pairwise stranded mode for electricity transmission. A metal layer is coated on the surface of the pentagonal start framework, and an aluminum layer of an aluminum foil layer is arranged on the inner side so that the aluminum layer can be in electric contact with the metal layer of the pentagonal start framework. A steel wire is tightly wrapped on the outer surface of the aluminum foil layer to form an armor layer, and a plurality of air holes are formed in the pentagonal start framework. The dielectric constant of the pentagonal start framework is larger than 0.1 and smaller than 2.3. By means of the photoelectrical composite data cable, communication cable allowance of crosstalk indicators is effectively improved by 1%, and even allowance of loss is improved by 1dB. Stability of characteristic impedance is increased by 1.5%, and meanwhile external electromagnetic interference is effectively prevented from entering the cable and internal signals are prevented from radiating out.

The present disclosure relates to a two-track surface acoustic wave (SAW) device that has a first SAW track and a second SAW track. The second SAW track may include an interconnecting grating that divides an acoustic cavity of the second SAW track into two acoustic cavities, which are acoustically coupled to one another. The first SAW track and the second SAW track may be electrically coupled to one another transversally via a first re-radiation interconnection and a second re-radiation interconnection. When the two-track SAW device is used in a bandpass filter, by including the interconnecting grating, insertion loss and roll-off response characteristics of the bandpass filter may be improved. Further, in one embodiment of the two-track SAW device, addition of capacitance between the re-radiation connections may improve return loss of the two-track SAW device.

The invention discloses a double-frequency duplexer based on a substrate integrated waveguide. The double-frequency duplexer comprises a filter dielectric substrate, a top metal layer arranged on theupper surface of the filter dielectric substrate, a bottom metal layer arranged on the lower surface of the filter dielectric substrate, and a metal layer arranged between the upper surface of the filter dielectric substrate and the lower surface of the filter dielectric substrate; T-shaped output ports are formed in the metal layers on the upper surface and the lower surface of the filter mediumsubstrate; and an input feed network is arranged on the middle metal layer. The double-frequency duplexer is simple in design structure and easy for industrial processing; firstly a miniaturized double-frequency SIW-based double-frequency duplexer is introduced, so that the problem of relatively large size of a filter is solved to a relatively great extent; and secondly, the input feed network structure of the middle metal layer is introduced, so that the gain based on the SIW filter is further increased, and a foundation is laid for improvement of the passband gain of the double-frequency SIWfilter and improvement of the echo loss.

An integrated high-return-loss optical component adapter comprises a plug type adapter part, a ceramic plug core, a positioning metal ring and a ceramic sleeve. The plug type adapter part comprises a front base, a rear base and a clamping base. The front base is provided with a bottom plate A, a protruding structure and a step-shaped through hole penetrating the bottom plate A and the protruding structure. The rear base is provided with a bottom plate B and a cylindrical shell, and the bottom plate A and the bottom plate B are connected in a matched mode. The clamping base is provided with a bottom plate C, a limiting sleeve and an elastic clamping plate, and the bottom plate C is pressed to the bottom plate A through the rear base. The positioning metal ring is arranged in the portion, in the protruding structure, of the through hole in a sleeved mode. The two ends of the ceramic sleeve are inserted in the portion, in the bottom plate A, of the through hole and the limiting sleeve respectively. The ceramic plug core and the positioning metal ring are in interference fit, and one end of the ceramic plug core is inserted in the ceramic sleeve. By means of the integrated high-return-loss optical component adapter, the ceramic plug core, the ceramic sleeve and the plug type adapter part can be integrally and coaxially assembled, the structure is compact, a connector is universal, installation and use are convenient, optical performance is good, and the integrated high-return-loss optical component adapter is widely applied to the fields of optical communication modules and photoelectric detectors.

The present invention relates to a high-isolation dual polarization station antenna unit facing 5G application. The unit comprises a dielectric slab, a coaxial feeder, a back panel and an SMA feeder arranged in order from top to bottom. The front and back surfaces of the dielectric slab are etched with a first bow-tie dipole antenna and a second bow-tie dipole antenna which are vertically arrangedat +-45 degrees, each bow-tie dipole antenna is formed by two symmetrically arranged dipole antenna arms, and each dipole antenna arm comprises one optimized fractional parasitic structure. The high-isolation dual polarization station antenna unit facing 5G application forms a station antenna unit with low loss and high isolation features and low loss and high loss and high isolation through theoptimized fractional parasitic structure so as to reduce the loss of the antenna itself and reduce the self interference between antennas.

The present invention belongs to the field of electric cable producing technology, and is especially physical foaming method of producing electric cable. The physical foaming method is that industrial nitrogen in certain pressure is injected through injection holes of certain aperture into fused plastic to reach the foaming aim. The present invention has homogeneous, stable and controllable foaming degree and raised product performance, and may be used widely in electric cable production.

The invention relates to a T-shaped four-cantilever beam type electronic calibration member switch comprising a substrate for providing brace foundation, a microwave transmission component arranged onthe substrate, and a packaging component for packaging the microwave transmission component; the microwave transmission component comprises signal wire units arranged in a symmetric way, ground wireunits arranged at the peripheral sides of the signal wire units, an air bridge unit conducting to the ground wire units and a driving electrode arranged below the signal wire units. Compared with conventional single-pole double-throw switches, the T-type four-cantilever beam type electronic calibration member switch has obvious advantages, and a radio frequency MEMS switch has four cantilever beams to form a symmetric structure, so that insertion loss is reduced, return loss is promoted, and the isolation of the switch is excellent. Therefore, the life and the microwave performance of the switch are promoted. Electronic calibration of DC-40GHz can be realized, circuit complexity is reduced, calibration process is simplified, calibration efficiency and calibration accuracy are improved, andapplication of the radio frequency MEMS switch in the field of calibration of a vector network analyzer of a higher frequency band is realized.

The invention discloses a miniaturized broadband power divider circuit based on spur lines. The circuit includes a first port (1), a second port (2), a third port (3) and an isolation resistor (R1), wherein the isolation resistor (R1) is arranged between the second port (2) and the third port (3), a transmission path from the first port (1) to the second port (2) adopts a microstrip line, a transmission path from a first port (1) to a third port (3) adopts a microstrip line, a first spur line (20) is arranged on the microstrip line of the transmission path from the first port (1) to the second port (2), a second spur line (30) is arranged on the microstrip line of the transmission path from the first port (1) to the third port (3), and the first spur line (20) and the second spur line (30) are used for reducing the size of the power divider, reducing insertion loss and expanding the bandwidth of the power divider. The relative electrical length of the microstrip lines increase based on the spur lines, the actual length is shortened, the size of the power divider is reduced, and stepped impedance lines and branch lines are equivalently introduced to the transmission paths to expand the bandwidth of the power divider, and the power divider is smaller in size than a traditional Wilkinson power divider, and has larger bandwidth and smaller insertion loss.

A patch plug is provided that facilitates field installations thereof, e.g., using conventional equipment such as a conventional punch tool. Preferred patch plugs according to the present disclosure include a cover and a housing, each of which includes a hinge member to facilitate relative rotations of portions of the housing and cover. Rotational / pivotal motion of the cover and the housing relative to the disclosed hinge members facilitates establishing electrical connection with terminals positioned therewithin. The terminals that may be positioned in alternating pairs to provide improved return loss, and printed circuit boards are provided for further improved performance.

An embodiment of the present application discloses an antenna array, comprising N antenna elements; the N antenna elements have the same wavefront direction and the transverse spacing between every two is equal. The feeding phases of the N antenna elements form a first arithmetic sequence, and the tolerance of the first arithmetic sequence is a preset phase difference; The distances of the N antenna elements to the vertical plane in the wavefront direction form a second arithmetic sequence, and the tolerance of the second arithmetic sequence is a preset distance difference; The spatial phase difference between the N antenna elements formed by the preset distance difference and the preset phase difference is cancelled out with respect to the vertical plane; N is an integer greater than or equal to 2. When the antenna array is applied to the transmitting and receiving channels of the radar system, the leakage signal can be canceled, the self-jamming is greatly reduced, the receiving channel of the radar system is protected, and the sensitivity of the radar system is improved. Embodiments of the present application also provide an antenna transceiver system and a radar system.

The invention relates to the field of optical communication, in particular to a structure for improving return loss, which comprises a first collimating lens, a filter, a second collimating lens and aPD chip. The first collimating lens is used for converting incident light into collimated light. The axis of the second collimating lens is perpendicular to the axis of the first collimating lens. The second collimating lens is provided with a virtual plane, and the virtual plane divides the second collimating lens into a first part of lens close to the first collimating lens and a second part oflens far away from the first collimating lens. The filter is located on the side, close to the first collimating lens, of the virtual plane and used for reflecting collimated light to the first partof lens, the PD chip is located behind the second collimating lens, and the photosensitive surface of the PD chip faces a lens assembly and is parallel to the axis of the first collimating lens. Separation of incident light and reflected light of the photosensitive surface is achieved, and meanwhile the requirements for responsivity, reliability and production efficiency are met.

A simple, power efficient and inexpensive digital compensation scheme for reducing delay in a digital impedance matching circuit to improve return loss. The scheme employs a digital filter to compensate for the absolute sampling and digital delays associated with a digital impedance matching circuit. The digital filter is based on the low-pass function of a DAC response, and can easily be modified to correct for not only the DAC response delay, but also other delays in the digital impedance matching circuit. The digital filter is very simple to implement and can add or subtract delays from the overall system.

The invention discloses a three-dimensional hairpin filter applied to 6G communication. The hairpin filter comprises a hairpin unit column and an upper grounding RDL which are arranged in parallel, the hairpin unit column is formed by arranging a plurality of hairpin units at intervals; a signal TSV is arranged at one end of the hairpin unit; the other opposite end is a signal RDL; the upper and lower end surface structures of the adjacent hairpin units are opposite; symmetrical signal feeders are arranged at the tops of the two ends of the hairpin unit column. Signal RDLs are arranged on thetop surfaces of the hairpin units at the end parts of the two ends of the hairpin unit column; the top of the upper grounding RDL is provided with a grounding feeder line opposite to the signal feederline, the bottom of the upper grounding RDL is provided with a lower grounding RDL, a grounding TSV opposite to the signal TSV is arranged between the upper grounding RDL and the lower grounding RDL,and the signal TSV and the grounding TSV are embedded in the same silicon substrate. According to the three-dimensional hairpin filter, the design of the three-dimensional hairpin filter in the THz frequency band is successfully realized by adopting the TSV technology, and the return loss in the filter passband is improved by adopting the four-arm hairpin unit, so that the performance is improved.

The invention relates to a high return loss connector with adjustable light attenuation. The high return loss connector with the adjustable light attenuation comprises a front cover, a front light guiding assembly, a sleeve, a thread pair assembly, a back light guiding assembly, a back cover, an elastic device, a jacket and a tail cover. The thread pair assembly comprises a mark drive plate and a threaded top cover, wherein the back light guiding assembly is arranged in the matched back cover, the front light guiding assembly is arranged in the matched front cover, the sleeve enables the front light guiding assembly and the back light guide assembly to be coaxially assembled, the front light guiding assembly, the sleeve and the back light guiding assembly are arranged in the threaded top cover in a penetrating mode of the thread pair assembly, one end of the thread pair assembly and the back light guiding assembly are assembled through a threaded structure, the other end of the thread pair assembly contacts with the front light guiding assembly, the front cover and the back cover are buckled, the back cover is buckled with the jacket, the elastic device is limited in a space formed by the back cover and the jacket, an opening is formed in the back cover, the opening enables the mark drive plate to show and to achieve turning, and the tail cover is buckled with the jacket. The high return loss connector with the adjustable light attenuation has a characteristic of high return loss, is compact in structure, low in cost, and appropriate for volume production.

The invention discloses an antipodal Vivaldi antenna based on gradual change type guide sheet loading. A gradual change type guide sheet is loaded at an opening of an EGSA, and the structure is defined by a three-point arc line and a straight line. A GPA antenna comprises a dielectric substrate, metal radiation sheets, a microstrip balun, an elliptical slot line, an exponential gradual change slotand a gradual change guide sheet; the metal radiation sheets are respectively fixed on the top surface and the bottom surface of the dielectric substrate; the impedance matching microstrip balun is composed of a linear gradual change microstrip line and a metal patch with an elliptical slot line; the metal radiation sheet is provided with an exponential gradual change groove line with a horn-shaped opening, the exponential gradual change groove line is symmetrical about the horizontal central axis of the horn-shaped opening, the outer side wall of the metal radiation sheet is provided with the corrugated exponential gradual change groove, and a GP is loaded at the opening of the EGSA.

The present disclosure relates to a two-track surface acoustic wave (SAW) device that has a first SAW track and a second SAW track. The second SAW track may include an interconnecting grating that divides an acoustic cavity of the second SAW track into two acoustic cavities, which are acoustically coupled to one another. The first SAW track and the second SAW track may be electrically coupled to one another transversally via a first re-radiation interconnection and a second re-radiation interconnection. When the two-track SAW device is used in a bandpass filter, by including the interconnecting grating, insertion loss and roll-off response characteristics of the bandpass filter may be improved. Further, in one embodiment of the two-track SAW device, addition of capacitance between the re-radiation connections may improve return loss of the two-track SAW device.

The invention discloses a production method of fiber arrays, which comprises the following steps: adopting an usual injection molding machine and a conventional injection molding technology, adopting high polymer plastic as injection molding materials, placing finished fiber belts available in the market into the high polymer plastic materials in an injection molding machine mold cavity so as to obtain a pre-molded piece through injection molding; cutting off redundant fiber belts from the end face of one side of the pre-molded piece through a sapphire scalpel; adopting a fiber grinding machine to grind the end face of the side of the pre-molded piece after cutting the redundant fiber belts, thus obtain a fiber array. The production method of fiber arrays is simple in technology, short in processing period of the fiber arrays, low in manufacture cost and high in product percent of pass, and greatly reduces processing difficulty of the fiber arrays. The production method is suitable for being popularized and applied to the fiber manufacture field.

The invention provides a hand-held communication device provide with a coupling slot antenna module, belonging to the communication field. The coupling slot antenna module mainly comprises a dielectric basal plate, a radio frequency module, a grounding plane, a resonance cavity and a radiation plate. A feed line and a branch line of the communication device are coupled on the surface of the dielectric basal plate and extended along the direction which is slightly parallel to the long edge of the dielectric basal plate. The grounding plane is coupled on the other surface of the dielectric basal plate and has a coupling slit structure, wherein, a cross point of the coupling slits is positioned on a position which the feed line and the branch line pass through. An air layer is arranged between the radiation plate and the grounding plane, the radiation plate is parallel to the grounding plane at the coupling slits.

The invention provides a Ku-band waveguide-based spatial four-way power combiner, which is characterized in that: two pieces of one side finline amplifier PCBs with double channels, which are vertical to an E surface of waveguide, are placed symmetrically in the waveguide as a mode of 2+2; the two pieces of one side finline amplifier PCBs with double channels are isolated by a cushion block so that there is a gap between the two pieces of one side finline amplifier PCBs with double channels. In the invention, four-way power combination is achieved by two pieces of PCBs and the combination is performed in the waveguide, which saves spaces and reduces the volume of the model. Combined efficiency is more than 80%.

The invention is a supervising device for erbium-doped amplifier gain character, it includes a fiber with long period fiber grating and bipyramid type fiber with even waist, one a flat board with arc block, the shape of the arc block and the shape of the cone waist of the bipyramid type fiber, the waist part of the bipyramid fiber attaches to the arc block tightly, the mentioned fiber with long period grating supporting to the flat board, the packaging layers of the two fibers attaches tightly; the whole structure is sealed in a rectangular box with constant temperature, the two output ends of the fiber leaded from the box are connected to connectors.

The present invention discloses a multi-system multiplexing platform cable combining apparatus which comprises power dividers and 3DB electric bridges, a six-frequency combiner 1 and a six-frequency combiner 2. The power dividers and 3DB electric bridges are respectively connected with the six-frequency combiner 1 and six-frequency combiner 2. When the apparatus according to the invention is adopted, the main performance indexes of insertion loss, in-band fluctuation, echo loss, out-of-band rejection, third order inter-modulation, bearing power and the like of the POI are equally improved with a large scale. At the same time the structural volume is reduced with a large scale and the application in the project is facilitated.

The invention discloses a Vivaldi antenna realizing low return loss and high gain at low frequency. The Vivaldi antenna is characterized in that an exponential gradient slot is loaded on the outer side of the CAVA. An EGSA antenna comprises a dielectric substrate, metal radiation sheets, a microstrip balun, an elliptical slot line and the exponential gradient slot. The metal radiation sheet are respectively fixed on the top surface and the bottom surface of the dielectric substrate. The impedance matching microstrip balun is composed of a linear gradient microstrip line and a metal patch withan elliptical slot line. The exponential gradient slot structure (EGS) is loaded on the outer side of the metal radiation sheets, the operating bandwidth of the EGSA at S<11> < -10dB is increased to 185% of that of CAVA and the EGS structure effectively improves the return loss in low frequency band.