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 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 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.

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.

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.

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 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 present invention discloses a filter and a method for generating resonant mode and equivalent capacitance. The filter comprises an input port PIN, an output port POUT, a filter module having fiveresonant modes and two passbands, a ground line layer GND1, a ground line layer GND2, a shielding layer SD1 and a shielding layer SD2 which are respectively located at different horizontal planes andcommonly form a three-dimensional integration structure so as to effectively shorten the whole size and weight of the filter and reduce the cost; the flexible combination of the resonance stub and thecapacitance conduction band is employed to achieve five resonant modes, the structure is simple, the five resonant modes are flexibly achieved, and the flexibility is high; and the resonant frequencies of the five resonant modes are regulated to combine the neighboring resonant frequencies to achieve dual passband, and the echo loss of the input port is superior to 17dB, and the insertion loss inthe passbands is superior to 2.5dB.