90results about How to "Reduce reflection loss" patented technology

A primary radiator used for a parabolic antenna including: a radiator body having a horn part provided at one end of a waveguide; and a waterproof cover covering an open end of the horn part of the radiator body, wherein a step is formed on an inner surface of the horn part of the radiator body, and a position of the step is set so that radio waves reflected on the waterproof cover are cancelled out by radio waves reflected on the step to prevent multiple reflection in the radiator body.

This invention relates to a front electrode/contact for use in an electronic device such as a photovoltaic device. In certain example embodiments, the front electrode of a photovoltaic device or the like includes a multilayer coating including at least one transparent conductive oxide (TCO) layer (e.g., of or including a material such as tin oxide, ITO, zinc oxide, or the like) and/or at least one conductive substantially metallic IR reflecting layer (e.g., based on silver, gold, or the like). In certain example instances, the multilayer front electrode coating may include one or more conductive metal(s) oxide layer(s) and one or more conductive substantially metallic IR reflecting layer(s) in order to provide for reduced visible light reflection, increased conductivity, cheaper manufacturability, and/or increased infrared (IR) reflection capability. At least one of the surfaces of the front glass substrate may be textured in certain example embodiments of this invention.

An apparatus comprises a metamaterial including a first conducting layer, a second conducting layer, and a dielectric layer located between the first conducting layer and the second conducting layer. Each conducting layer has holes formed therethrough, for example as an array of holes formed through the metamaterial. The holes are configured so that the metamaterial has a gradient refractive index at an operational wavelength. The operational wavelength may be an IR or visible wavelength. The apparatus may be an optical element, and for example may have the functionality of a lens or prism through the refractive index gradient. Interfaces may be parallel planar interfaces.

An illumination device comprising a housing fixture, a light source, and an active heat transfer device is provided. The housing fixture includes a base adapted to be receivable in a light fixture receptacle configured to receive a gas-discharge lamp. The light source emits light with a color rendering index higher than a respective color rendering index of at least a type of gas-discharge lamp. The active heat transfer device is physically coupled to the light source and mounted to the housing fixture. The active heat transfer device receives power from a power supply to remove thermal energy from the light source.

A display screen of touch type is prepared for using top base plate in display component also as bottom base plate of touch screen, plating conduction layer on external surface of top base plate in display component and arranging electrode used as an operation surface of touch screen on said conduction layer then integrating display component and touch screen to be an unified body.

The static birefringent polarizing interference imaging spectrometer consists of a pre-telescope system, a polarizing interferometer, an imaging lens set and an area array detector arranged coaxially and successively in the incident light direction, as well as a computerized signal treating system connected to the output of the area array detector. The polarizing interferometer consists of a polarizer, a Savart polariscope and an analyzer. The present invention adopts Savart polariscope as the transverse shearing beam splitter, and the advantages of infinitely far target, linear light path, simple structure, high stability, high S/N ratio, high resolution, etc.

The invention relates to a hybrid lumped distribution miniature band-pass filter. The hybrid lumped distribution miniature band-pass filter comprises a 50-ohmage input-output port installed on the surface, four parallel-connection resonance units, two interstage coupling inductors, a interstage coupling capacitor, a Z-shaped cross coupling capacitor and an input/output inductor which are all achieved through the multilayer low-temperature co-fired ceramic technical skill. The hybrid lumped distribution miniature band-pass filter has the advantages of being good in band-pass selectivity and out of band rejection, low in insertion loss, light in weight, small in volume, high in reliability, good in electric performance, phase-frequency characteristic linearity, temperature stability and electric performance batch uniformity, low in cost, capable of being produced massively and the like, and is especially applicable to radars, communication, rocket carrying, plane carrying, missile carrying, spacecrafts, man-portable mobile communication terminals and other wireless communication handheld and portable terminal products and corresponding frequency range systems with strict requirements for volume, weight, electric performance, reliability and the like.

The invention discloses a light-emitting diode (LED) epitaxial structure and a manufacturing method thereof. The LED epitaxial structure successively comprises an epitaxial substrate, a leukotriene (LT)-GaN nucleating layer, a high-temperature non-doped buffer layer, a P-GaN layer, a P-AlGaN layer, a diffusion barrier layer, a multiple quantum well (MQW) luminous layer, an InGaN current expansion layer, an N-ZnO layer and a surface-coarsened ZnO layer. The manufacturing method comprises the following steps: pre-treating the epitaxial substrate; growing the nucleating layer; growing the buffer layer; growing the P-GaN layer; growing the P-AlGaN layer; growing the diffusion barrier layer; growing the MQW luminous layer; growing the InGaN current expansion layer; growing the N-ZnO layer; and growing the surface-coarsened ZnO layer. By using the LED epitaxial structure obtained by virtue of the manufacturing method provided by the invention, an excellent electrical property and a good optical property are obtained, the internal quantum efficiency and the electronic static discharge (ESD) resistance capability are improved, the lost light caused by total reflection is lowered, the external quantum efficiency is greatly improved, a high-brightness LED is obtained, and the purposes of development and sustainable development of the LED industry are greatly promoted.

A laser surface treatment for reducing reflection loss on the surface of an optical material is provided. A metal film is formed on the surface of the optical material, and then the metal film is removed from the optical material by irradiation of an ultra-intense short-pulse laser beam having a pulse width of 1 femtosecond to 100 picoseconds, so that a fine periodic structure is formed on the surface of the optical material exposed by the removal of the metal film. The obtained fine periodic structure has asperities with a periodic interval of preferably 50 to 1000 nm, which can be controlled by changing the laser energy density.

The invention discloses a feed-forward type microwave antenna, which comprises a radiation source, a first metamaterial panel, a second metamaterial panel and a reflection panel, wherein the first metamaterial panel and the second metamaterial panel are used for diffusing electromagnetic waves emitted by the radiation source; and the reflection panel is stuck at the back of the second metamaterial panel. After being diffused through the first metamaterial panel, the electromagnetic waves enter the second metamaterial panel to be refracted. After being reflected by the reflection panel, the electromagnetic waves enter the second metamaterial panel again to be refracted and finally exit in parallel. The antenna is manufactured by adopting a metamaterial principle; therefore, the antenna is free from limitation of the conventional shapes of a convex shape, a concave lens shape and a parabolic shape; by adopting the antenna disclosed by the invention, the shape of the antenna is planar orin any shape; furthermore, the antenna is thinner in thickness, smaller in volume and more convenient to process and manufacture; and the antenna has the benefits of being low in cost and good in gain effect.

The feed source of the corrugated horn comprises a harmful harmonic mode suppresser, the corrugation groove mode converter with double-groove structure, the frequency change and angle change transition section with double-groove deep corrugation structure and the radiation section with double-groove deep corrugation structure. The corrugation groove mode converter combines the harmful harmonic suppresser and the annular loading groove as well as the straight groove so as to reach the purpose of restraining excitation of the harmful harmonic mode, lowering reflectino loss and dual-band joint use. The invention possesses the features of rotation symmetry of the radiation pattern in two discrete frequency ranges, low electrical level of the side lobe and cross polarization, low reflection loss and high gain.

The invention relates to a lead-free LED (Light-Emitting Diode) module and a manufacturing process thereof. The LED module comprises a radiator, a PCB (Printed Circuit Board), an LED chip, an encapsulating colloid, sealing silica gel and a lens module, wherein the LED chip is welded on the PCB; the anode and cathode of the LED chip are welded on corresponding electrode pads respectively; the PCB is jointed with the radiator; and the lens module is arranged above the LED chip, and is filled with the encapsulating colloid. The LED chip is directly welded on the circuit board, so that the conventional LED encapsulating process is eliminated, a bracket comprising a heat sink is eliminated, heat of the LED chip is directly diffused to the high-heat-conductivity circuit board and the radiator, and the radiating effect is enhanced. Only the sealing colloid is arranged between the lens module and the LED chip, so that light rays pass through a small quantity of media, and the transmittance is high; and the filling colloid is matched with the refractive index of the lens module, so that the reflection loss is small, and the light emitting rate of the LED module is increased.

The invention discloses a surface texturing technology for a crystalline silicon solar cell. The surface texturing technology for the crystalline silicon solar cell comprises the following steps of (1), removing a mechanically damaged layer on the surface of a silicon chip through a sodium hydroxide solution with the concentration between 2 to 10 %; (2) mixing a silver nitrate solution with the concentration between 0.001 to 0.005 % and a hydrogen fluoride solution with the concentration between 0.2 to 1 % and depositing nano-silver particles from the mixed solution to the surface of the silicon chip; (3) mixing the hydrogen fluoride solution with the concentration between 10 to 15 % and a hydrogen peroxide solution with the concentration between 2 to 5 %, performing reaction between the mixed solution and the silicon chip with the nano-silver particles deposited and forming into holes in silicon chip positions around the nano-silver particles; (4) removing residual nano-silver particles inside the holes in the surface of the silicon chip through a dense nitric acid solution; (5) removing an oxide layer on the surface of the silicon layer through the hydrogen fluoride solution with the concentration between 5 to 10 %. The surface texturing technology for the crystalline silicon solar cell can reduce reflex losses and improve battery conversion efficiency.

A solar energy concentrating system with high light collection efficiency includes a light concentrating unit, a light homogenizing unit and photovoltaic modules. The light concentrating unit includes a parabolic reflector and an ellipsoidal reflector which are coaxial and confocal. The light homogenizing unit includes an infrared filter and a hollow spherical reflector with a hole in its surface. When the system is under illumination, light is concentrated by the light concentrating unit through the hole in the spherical reflector surface and reflected by the inner surface of the spherical reflector onto the photovoltaic modules. The infrared filter covers the hole in the spherical reflector surface and reduces the heat in the photovoltaic modules under concentrated light. The combination of the parabolic reflector and the ellipsoidal reflector obtain highly concentrated light, and the hollow spherical reflector ensures light uniformity on the photovoltaic modules and light utilization efficiency.

The invention discloses a sunlight collecting and transmitting device which at least comprises a lighting device, a light conduit and a diffuser, wherein the light conduit is connected with the lighting device, the diffuser is connected with the other end of the light conduit, the lighting device is a dome type lighting cover, the top end of the lighting cover is provided with a fixed hanging end which is at least connected with a cantilever, and at least one reflective mirror is arranged on the cantilever. By regulating the angle and the position of the reflective mirror, the lighting efficiency of a system can be effectively increased, especially when sunlight shines in a small degree. A solar panel and a positioner can be arranged on a transmission shaft, and thus, the position of the reflective mirror can be changed according to an irradiation angle of the sun. By regulating the angle and the position of the reflective mirror, the lighting efficiency of the system, can be effectively increased, especially when sunlight shines in a small degree.

The invention discloses a focusing probe device of ultrasonic nondestructive detection used for detecting the defect of a detected sample, comprising a cylinder used for fixing the ultrasonic focusing probe; the ultrasonic focusing probe is connected with the big end of an inner cylinder in a sealing mode; the bottom end of the inner cylinder is encapsulated with a sound transmission film; a liquid medium used for transmission of the ultrasonic wave is arranged in the cylinder container of the inner cylinder; the inner cylinder provided with the probe is connected into a whole with an outer cylinder by thread in an adjustable mode; under the conditions of the same gain, the capability of detecting the defect of the sample is much better than a general straight probe; the water distance of the device leads the display distance of an initial wave, an interface wave, a defect wave and a bottom wave in the screen of a flaw detector to be pulled open and leads the area of the detected sample to be outside a triple near-field area of the ultrasonic wave on a beam axis, thus improving the resolution of waveform display and the detection sensitivity, leading the operation of finding and judging the defect wave in the process of detecting the defect to be convenient, saving a water tank and a water supply device and realizing field detection.

The present invention provides a low-loss wideband terahertz wave gradient photonic crystal filter. The filter comprises a two-dimensional photonic crystal; different circular silicon dielectric columns are arranged periodically in a square lattice manner so as to form the two-dimensional photonic crystal; the middle of the two-dimensional photonic crystal is provided with a resonant cavity; the resonant cavity is composed of three dielectric columns; an input channel, an output channel and the resonant cavity are located on a horizontal line to form a terahertz wave transmission channel; the dielectric columns are evenly distributed at the upper side and lower side of the terahertz wave transmission channel and form a symmetrical structure; the sizes of the dielectric columns in the same row are identical; the radiuses of the dielectric columns are gradually increased from center to edge; and when terahertz waves arrives at the resonant cavity through the input channel, terahertz waves according with the resonant frequency of the resonant cavity are coupled into the resonant frequency, so that coupled output is obtained, and wideband filtering in the frequency range of 380GHz to 438GHz can be realized.

The specification and drawings present a new method and apparatus for a rotary hinge for transmitting an optical signal (e.g., comprising data) bi-directionally or uni-directionally from one part to another in an electronic device, wherein these parts can rotate relative to each other using the rotary hinge. The optical signal can be transferred from one side to the other side of the hinge independently from light transmitted in the opposite direction. A sending guiding element (e.g., an optical fiber or a light guide) can rotate around a common rotation axis permanently attached to the side sending the optical signal and the emitted optical beam is directed towards the common rotation axis. The receiving guiding element, which collects the optical beam, is concentrically in the centre (coinciding with the common rotation axis) of the receiving side and permanently attached to it.

The invention provides a GPS (Global Positioning System) and 3G (3rd-Generation) single-antenna realizing device which comprises a dual-resonant antenna used for receiving a radio frequency signal, a matching circuit which is connected with the dual-resonant antenna for obtaining the radio frequency signal and is used for performing signal matching processing on the radio frequency signal, and a diplexer, wherein the diplexer is connected with the matching circuit and is used for obtaining the radio frequency signal subjected to signal matching processing and sending the radio frequency signal subjected to separation processing respectively to a GPS module and a 3G diversity receiving module. The invention also provides a mobile terminal. Through the mode, according to the technical scheme disclosed by the invention, a GPS and 3G shared single antenna is realized by arranging the dual-resonant antenna, the matching circuit and the diplexer, so as to receive the signal; reflection loss and mismatch loss in the transmission process of the radio frequency signal are reduced; the transmission efficiency of the radio frequency signal is increased; the communication quality of the mobile terminal is enhanced; and the space of placing the antenna is not increased.

The invention belongs to the technical field of manometer function materials and particularly relates to a manganese diselenide manometer bar as well as a synthetic method and an application of the manganese diselenide manometer bar. The manganese diselenide manometer bars with different length-diameter ratios are obtained through regulating the addition quantity of surface active agents of polyvinyl pyrrolidone (PVP), and good microwave absorption performance is shown. The length-diameter ratio of the manganese diselenide manometer bar is 15 to 70, the minimum reflection loss is reduced along with the increase of the length-diameter ratio, and the minimum reflection loss can reach -12.72 dB. In addition, the preparation cost of the manometer material is low, the efficiency is high, the industrial amplification is easier for solving the practical application problem, the manometer material is used as a novel wave absorbing material to be widely applied to electromagnetic shielding andmicrowave absorption, and wide application prospects are realized.

The invention relates to a frequency-multiplication crystal coupler for improving the output efficiency of short-wave deep ultraviolet laser. The frequency-multiplication crystal coupler includes a first BaF2 crystal prism, a KBBF crystal and a second BaF2 crystal prism; the KBBF crystal is flat plate-shaped; the two BaF2 crystal prisms are respectively arranged at two side surfaces of the KBBF crystal; the top angles and bottom angles of the two BaF2 crystal prisms are adjacent to each other in pairs; the two BaF2 crystal prisms contact with optical cement at the two side surfaces of the KBBF crystal; the c-axis crystal orientation of the KBBF crystal is vertical to the contact surfaces of the two BaF2 crystal prisms and the KBBF crystal; the contact surfaces of the two BaF2 crystal prisms and the KBBF crystal, the two side surfaces of the KBBF crystal, a light beam entering surface and a light beam exiting surface are polished surfaces; light transmission directions are the crystal orientations of the two BaF2 crystal prisms, the intrinsic birefringence indexes of the two BaF2 crystal prisms in the crystal orientations being zero. With the frequency-multiplication crystal coupler adopted, reflection loss of the contact surfaces of the KBBF crystal and the BaF2 crystal prisms can be effectively decreased, and therefore, the conversion efficiency and output power of frequency-multiplied light can be improved.

The invention relates to an optical collector which is adjacent to an optical processing unit. The optical collector comprises a Frensnel lens unit and an antireflection layer. The Frensnel lens unit is provided with a light incident face and a light emergent face, and the optical processing unit is adjacent to the light emergent face, and is used for transmitting or transferring the light emerged out by the Frensnel lens unit. The antireflection layer is arranged on the light incident face.

A welding technique closely contacting a light transmissive second member to a first member and radiating deflection-controlled laser light from a second member side to weld both first and second members at a weld interface thereof. A reflectance reducing means is formed by an incident angle adjusting step provided in a cover plate that is disposed on a light radiating surface side of the second member. The reflectance reducing means reduces incident angles of the light at the light radiating surfaces of the first and second members, thus reducing the reflection loss of the laser light at the light radiating surfaces and improving the welding efficiency.

The invention provides an acidic texturing solution for texturing of a polycrystalline silicon chip and a using method thereof. The acidic texturing solution is characterized in that: when the acidic texturing solution is used for surface texturing of the polycrystalline silicon chip for a solar cell, excellent texturing effect can be achieved. The technical problems of environmental pollution of the texturing solution and textured surface non-uniformity caused by instable states of the texturing solution and the process conditions in the prior art are solved.

The invention relates to a production process of a crystalline silicon double-sided solar battery, comprising the following steps of: etching to enable a silicon substrate to have an etched face; manufacturing a window which accords with an electrode pattern on a backlight face of the silicon substrate; carrying out heat treatment on the silicon substrate to form a PN junction in the window; washing the silicon substrate; plating at least two layers of antireflection films on a light reflective face of the silicon substrate; plating the antireflection film on a backlight face of the silicon substrate; printing electrode slurry on a silk screen; and sintering to obtain a metal electrode so as to finish the manufacturing of a battery cell. The production process disclosed by the invention is ingenious in concept, is compatible with a conventional industrial battery production line and is easy for industrial manufacture; compared with the conventional solar battery, an electrode grid line is not arranged on the light reflective face of the double-sided solar battery so as to prevent the electrode grid line of the light reflective face from shielding sunlight; the backlight face is provided with a light trapping structure and an antireflection film layer so that the backlight face of the battery also can absorb and utilize the sunlight; and the antireflection films of the light reflective face and the backlight face can passivate the solar battery, so as to be good for improving the efficiency of the battery.

The invention discloses an electrooptical modulator and relates to the field of laser frequency stabilization. The electrooptical modulator is composed of two titanium phosphate oxygen potassium crystals (2, 5), four electrode plates (1, 3, 4, 6) and an insulating substrate (7). By means of the shape, the structure and the mutual position relation between the two titanium phosphate oxygen potassium crystals (2, 5), light enters in the brewster angle of all light passing end faces of the titanium phosphate oxygen potassium crystals, thus reflection losses are reduced. In addition, reflected light and incident light are obviously separated in space and the etalon effect is prevented from occurring. The two crystals are used in cooperation, and light beams can be transmitted without excursion after passing the modulator. The electrooptical modulator has the advantages that the electrooptical modulator can be used for suppressing high-frequency noise of a laser; when light rays which excurse horizontally enter in the brewster angle, insertion losses of the light rays are small and the etalon effect does not exist.

Traveling-wave directional filters (DFs) with multiple coupling slots are disclosed. A traveling-wave directional filter may include two terminating conductive strips in a top circuit layer of a substrate, a loop resonator in a bottom layer of a substrate, and a shared ground plane. Coupling slots in the ground plane may couple the conductive strips via the loop resonator.

A ferroelectric film phase shifter able to dual-periodically install the adjustable ferro-electric capacitor on coplane line consisting of a transmission line and two grounded planes at both sides of said transmission line, which are attached to a plane on substrate, is disclosed. A seam is between said transmission line and a grounded plane. A method for measuring and optimizing its reflection characteristics includes such steps as making the length of adjacent two transmission lines constant, changing the installing position of said adjustable capacitor, checking its reflection and transmission characteristics by computer simulation, regulating the installing position, computer simulation to obtain its reflection frequency response curve, and comparing them to choose the one with less reflection loss and proper bandwidth.

The invention provides a coupling structure of a SiON waveguide and an optical fiber and a manufacturing method of the coupling structure of the SiON waveguide and the optical fiber. The structure comprises the SiON waveguide serving as an input waveguide, a silicon dioxide waveguide wrapped around the outer side of the SiON waveguide, a tapered SiON waveguide and a SiON output waveguide. The tapered SiON waveguide is wrapped around the inner side of the silicon dioxide waveguide and positioned below the horizontal plane of the SiON waveguide; the size of the cross section of the tapered SiONwaveguide is smaller than that of the SiON waveguide and is gradually enlarged in a light transmission direction; the SiON output waveguide is connected with the tapered SiON waveguide. According to the structure, the SiON waveguide is coated with a layer of SiO2, so that the structure is separated from air, and a protective effect is achieved. The SiON waveguide and the tapered SiON waveguide have different refractive indexes; the SiON waveguide can be matched with the optical fiber; the tapered SiON waveguide can be small in size; through the coupling structure, a device can be made small, and the energy consumption is reduced.

The invention provides a single aspherical lens for LD and fiber coupling. The single aspherical lens comprises two aspheric curved surfaces and is characterized in that: an aspheric lens section is fitted into an aspherical expression formed by quadratic terms and high-order terms, z=cr2/1+square root(1-(1+k)c2r2) + Sigma <N>(i=1)AiEi(x,y), wherein c is a quadric surface curvature of the aspherical lens, r is a radius, k is a quadric surface constant, and A is a high-order coefficient. An LD light source can accept a maximum divergence angle Theta //=11 degrees in an optical axis, the perpendicularity of Theta is 25 degrees, a light source main optical axis, a lens center axis and a focal point center are required to be on a same straight line, and an allowable error range is from -0.08mmto 0.08mm. The single aspherical lens for LD and fiber coupling has the advantages that lenses are few, the cost is low, the structure is simple, the installation and debugging are easy, the reflection loss is low, the coupling efficiency is high, and the coupling efficiency reaches 88% after using the lens.