88results about How to "Low loss characteristic" patented technology

The invention discloses a half-mode substrate integrated waveguide leaky-wave antenna for variable polarization and frequency scanning, and belongs to the technical field of wireless communication. The antenna comprises a medium substrate with metal patches arranged on two faces, a half-mode substrate integrated waveguide antenna array A, a half-mode substrate integrated waveguide antenna array B, four micro-strip feeder lines, a 3dB directional coupler and two micro-strip connecting lines are arranged on one metal patch, an interdigital groove inclined by -45 degrees and a metal through hole A are etched in the half-mode substrate integrated waveguide antenna array A, and an interdigital groove inclined by 45 degrees and a metal through hole A are etched in the half-mode substrate integrated waveguide antenna array B. Compared with the prior art, the half-mode substrate integrated waveguide leaky-wave antenna is low in loss, low in cost, small in size and capable of achieving multiple kinds of polarization simply and effectively and achieving beam scanning economically and practically.

An organic / inorganic oxide mixture has high capacitance density so as to realize a capacitor material that can be self-contained in a substrate. The mixture film made of inorganic oxide particle has a mean particle size of less than 90 nm dispersed in organic polymer, of which relative dielectric constant is more than 10 and thickness is less than 900 nm.

The present invention provides a method for producing a homogeneous complex oxide sol comprising Si and a metal other than Si as metal elements, and a method for producing a Si-containing hologram recording material using a homogeneous complex oxide sol. A method for producing a complex oxide sol comprising Si and a metal other than Si as metal elements, the method comprising: mixing a silanol compound with an alkoxide compound of a metal other than Si so that the silanol compound is reacted with the alkoxide compound, thereby yielding a precursor of a complex oxide, and adding water to the complex oxide precursor so as to hydrolyze an alkoxyl group bonded to the metal other than Si, and then making the resulting hydrolysate undergo a condensation reaction, thereby forming a complex oxide. A hologram recording medium (11) having a hologram recording layer (21) comprising the hologram recording material obtained by the production method.

The invention discloses an MnZn ferrite magnetic material with high initial permeability and low loss and a preparation method thereof, the MnZn ferrite is prepared by principal components and auxiliary components, and the principal components and the mass percentage by oxide are as follows: 60-73wt% of Fe2O3, 13-33wt% of ZnO and balance Mn3O4; the auxiliary components are five oxides: 0.01-0.04wt% of SnO2, 0.01-0.04wt% of TiO2, 0.03-0.05wt% of Er2O3, 0.05-0.08wt% of Bi2O3 and 0.03-0.08wt% of PbO; and the soft magnetic ferrite material has not only high initial permeability but also low loss, and has excellent comprehensive soft magnetic properties.

The invention discloses a preparation method of a full-medium all-dielectric three-dimensional broadband gradient refractive index lens. The preparation method comprises the steps of achieving a part with lower dielectric constant by utilizing a metamaterial-scale three-dimensional photonic crystal with a gradually-changed space structure parameter, achieving a part with a larger dielectric constant by adopting a mixed liquid medium in different mixing ratios, assembling a space structure parameter gradient metamaterial-scale three-dimensional photonic crystal structure the metamaterial-scale three-dimensional photonic crystal with a gradually-changed space structure parameter and a multi-layer frame filled with the mixed liquid medium according to dielectric constant distribution, and then obtaining the prepared full-medium all-dielectric three-dimensional broadband gradient refractive index lens. The lens can achieve a very broad refractive index variation range, can achieve impedance matching with an air background, and has the advantages of low loss, broadband and the like due to the non-resonance characteristic of the lens and the low loss characteristic of a material.

The present invention relates to method of no-magnetic field treating process to obtaining nanometer crystal soft magnetic material with special squareness ratio. The material has component of Fe76.5-x-yCu1NbxVySizB9, where x is 0-5, y is 0-7 and z is 0-20; and is prepared through vacuum inducing furnace smelting to obtain mother alloy, single-roller quick quenching process to prepare non-crystal alloy belt, winding in winding machine, and crystallizing to prepare nanometer crystal alloy. The present invention prepares medium and high squareness ratio material and medium and low squareness ratio material directly, needs no magnetic field apparatus, and has less preparing steps and low cost, and the prepared material has low loss and high magnetic permeability.

The invention discloses a wideband Yagi aerial for half-mould substrate integrated waveguide feed, comprising a dielectric substrate which is provided with a metal coating on both sides. The structurecomprises a half-mould substrate integrated waveguide, a Yagi aerial, a micro-strip gradual-change transition wire and a 50 Ohm micro-strip output wire. The half-mould substrate integrated waveguidecomprises a metallic through hole, an upper metal coating and a lower metal coating. The Yagi aerial comprises a wave director, a cross feed source matrix of upper and lower surfaces, and parallel wires. For measuring conveniently, the micro-strip gradual-change transition wire is connected between the half-mould substrate integrated waveguide and the 50 Ohm micro-strip output wire. The half-mouldsubstrate integrated waveguide structure is used as the feeding structure of aerial, so the 180 DEG balanced line structure with a current phase difference of upper and lower metal surfaces is formedand can be directly connected to the Yagi aerial. For improving the plus, four wave directors are used to form a printed antenna structure, with wideband, high plus, low cost and low outline.

The invention discloses a quasi-distributed sea water temperature salinity sensor, a measuring device and a method thereof. The sea water temperature salinity sensor is an optical fiber. A number of sensing areas and non-sensing areas are arranged on the optical fiber. Each sensing area comprises a weak grating combination of LPG and FBG. LPG is sensitive to salinity and temperature, and produces power loss with the amplitude related to salinity and temperature for backscattered light. FBG is only sensitive to temperature, and produces power enhancement with the amplitude related to temperature for backscattered light. Single-wavelength pulse laser is input into the optical fiber. A backscattered light signal returned by the optical fiber is detected. The backscattered light signal is demodulated to acquire the sea water temperature and salinity detected by each sensing area. The sea water temperature value and the salinity value of multiple points are measured at the same time. The demodulation step is simple. According to the invention, LPG and FBG are optimized by writing parameters; the loss is low; and cascade long-distance quasi-distributed sea water temperature salinity detection is realized.

The invention provides a method for breaking a high-voltage (HV) superconducting current-limiting direct current (DC) circuit breaker. The method comprises the following steps: when a HVDC side is in short-circuit fault and current / current rising steepness rises rapidly and reaches a critical value of a current limiter, a superconducting material quenches immediately, impedance rises steeply, short-circuit current is limited within set values, and meanwhile, an instruction is sent to an ultra-quick mechanical switch; the ultra-quick mechanical switch acts immediately, enables contacts to separate at an ultrahigh rigid separating speed so as to form a physical gap and generate electric arcs, and immediately sends a breaking instruction to a power electronic switch; the power electronic switch quickly breaks the short-circuit current and enables the electric arcs between the contacts to be extinguished, so as to form an isolated fracture; when the contacts are separated to final open positions and current in a lightning arrester is attenuated to zero, the HV superconducting current-limiting DC circuit breaker completes a whole breaking process, and a HVDC transmission power grid is isolated from a faulty line. The method has the advantages that the cost performances of different components are taken into account comprehensively, so that the cooperation is optimized; the number of components and devices is reduced as much as possible, so that the size is reduced, the weight is reduced, and the reliability is improved.

The invention provides a parallel connection type unilateral elliptic function transmission line filter composed of transmission line elements. Input signals are fed into a first parallel connection cross joint (2) from an input transmission line (1) and divided into two paths to be transmitted to a second parallel connection cross joint (7) respectively through a cascading transmission line joint (3) and a parallel connection transmission line joint (4), and two paths of the input signals are synthesized and then output from an output transmission line (8). Two open circuit transmission line branch joints are connected to the two parallel connection cross joints respectively to adjust the amplitude of reflected signals. As for given cut-off frequency fc, various transmission line element parameters are selected, more than two nonzero limited frequency reflection null points with frequency lower than or higher than fc are generated, and a passing band is generated nearby a frequency band of the nonzero limited frequency reflection null points; meanwhile, more than two nonzero limited frequency transmission null points with frequency higher than or lower than fc are generated, a stop band is generated nearby a frequency band of the nonzero limited frequency transmission null points, and therefore filter characteristics of a unilateral elliptic function nearby fc are achieved. The filter is suitable for bandwidth below the medium degree of microwave and millimeter wave frequency bands, low loss, high selectivity.

The invention is a permanent magnet biasing inner rotor radial magnetic bearing, comprising inner magnetic conductor rings, stator iron cores, rotor iron cores, outer magnetic conductor rings, outer magnetic isolation rings, permanent magnet, excitation coils, and air gaps, where the stator iron cores I and II compose 8 magnetic poles in the positive and negative directions of X and Y axes at the left and right ends, each magnetic pole is wound with excitation coil, the inner magnetic conductor ring is inside the stator iron core, the rotor iron cores I and IV are outside the stator iron cores I and II, respectively; the rotor iron core II, the outer magnetic isolation ring, and the rotor iron core III are outside in the stator iron core III; the rotor iron cores I and II are interconnected through the outer magnetic conductor ring I; the rotor iron cores III and IV are interconnected through the outer magnetic conductor ring II; the outer magnetic conductor rings I and II are connected with the rotor iron cores II and III through the outer magnetic isolation ring, respectively; the air gaps are between the rotor iron cores and the stator iron cores; the inner magnetic conductor rings II and III are interconnected through the permanent magnet I, and the inner magnetic conductor rings III and I are interconnected through the permanent magnet II. And the invention can replace the existing magnetic bearings used in pairs, largely shortening axial distance.

Antenna duplexer (1) has first filter (3) passing a signal in a first frequency band and second filter (4) passing a signal in a second frequency band higher than the first frequency band, and first filter (3) includes series resonator (7) having the lowest antiresonance frequency and other series resonators. The propagation angle of the main elastic wave of series resonator (7) having the lowest antiresonance frequency and that of the main elastic wave of the other resonators are made different from each other so that an electromechanical coupling coefficient of series resonator (7) having the lowest antiresonance frequency becomes smaller than that of the other resonators.

A hollow negative curvature photonic crystal fiber with high birefringence and low loss comprises an optical fiber tube body which has a circular cross section and is hollow inside. The tube wall of the optical fiber tube body comprises inner and outer layers of circular ring structures. Two large capillary tubes internally tangent to an optical fiber interlayer are arranged in the hollow core ofthe optical fiber tube body in a bilateral symmetry manner. Three small capillary tubes which are internally tangent to the optical fiber interlayer and are the same are arranged in the hollow core ofthe optical fiber tube body above and below the space between the two large capillary tubes. A medium capillary tube internally tangent to the corresponding large capillary tube is arranged in each of the two large capillary tubes. The small capillary tubes, the medium capillary tubes and the large capillary tubes are bilaterally symmetrical. A light wave transmission cavity defined by the smallcapillary tubes and the large capillary tubes is formed in the center of the hollow core of the optical fiber tube body. The optical fiber tube body, the large capillary tubes, the medium capillary tubes and the small capillary tubes are all made of silica glass. The optical fiber is simple in structural design, the adjustable range of capillary structure parameters is large, and industrial preparation and commercial application of HCF can be achieved.

The invention discloses a phase encoding device based on a silicon substrate integrated waveguide. A single photon emission source is connected with the input end of a front-end coupler through a silicon waveguide; both a long-arm waveguide unit and a short-arm waveguide unit are connected to the output end of the front-end coupler; one rear-end coupler is connected to each of the output end of the long-arm waveguide unit and the output end of the short-arm waveguide unit; the long-arm waveguide unit comprises a first coupler, a delay waveguide and a second coupler; the first coupler is connected with the output end of the front-end coupler through the silicon waveguide and connected with the second coupler through the delay waveguide; the second coupler is connected with the input end of the rear-end coupler through the silicon waveguide; the silicon waveguide and the delay waveguide are produced on a silicon substrate. Compared with the prior art, the phase encoding device disclosed by the invention has the advantages that a long-arm delay part of an interferometer is realized by adopting a delay waveguide; the delay waveguide has the characteristic of low loss; the problem that an ordinary silicon waveguide has great loss in delay is solved, and the quantum bit generating efficiency of the encoding device is improved to a certain degree.

The disclosed directional coupler includes medium base plate with metal patches on its two faces. Input end, output end, isolation end and coupling end are setup on one face of the metal patch. Since integration waveguide structure in halfmodule base plate reserves inherent characteristic of low loss and since aspect ratio of the integration waveguide is smaller than SIW, thus, the loss of electromagnetic wave generated in process of transmission caused by nonideal medium is smaller so as to possesses better characteristic of low loss. Using mature technique for fabricating printing circuit board in single layer to produce the structure of waveguide, the invention possesses features of low cost, satisfied precision and performance so that mass production is feasible.

The invention provides an axial structured permanent-magnet motor which is applicable for fields of a motor and a power generator. The axial structured permanent-magnet motor comprises two stators and a rotor, wherein the rotor is arranged between the two stators, and a gap exists between the stators and the rotor. In the axial structured permanent-magnet motor, the stators and the rotor are matched, the power density and the mechanical characteristic of the motor can be improved, and the fabrication cost of the motor is reduced; and the motor efficiency can be remarkably improved with the low loss characteristics of the stators made of amorphous and nanocrystalline material, the starting torque of the motor also can be increased with the high-permeability characteristics, and the output hardness of mechanical characteristic of the motor under a high rotational speed also can be improved with the wideband characteristics.

The invention is a half-mode substrate integrated waveguide (HMSIW) annular bridge, relating to a millimeter wave and microwave device, especially relating to a HMSIW annular bridge, composed of metal patches arranged on the right and reverse sides of a medium substrate, where the right side of the medium substrate is equipped with an annular HMSIW composed of metal patch, and first port, second port, third port, and fourth port connected in parallel with the annular HMSIW to divide the whole ring into four segments, and a metallized through hole runs through the medium substrate between the two metal patches. The overall length of the annular HMSIW is 1.5+2*n times as large as the corresponding waveguide wavelength to operating frequency, where n is a non-negative integer. And the annular bridge has characters of small size, low loss, low cost, easy integration, and good performance.

A SAW device D1 according to the present invention comprises a ladder-type SAW device T1 for transmission and a ladder-type SAW device R2 for receiving on a main surface of a piezoelectric substrate. The ratio (LT / PT) of the width LT of electrode fingers to the pitch PT between the electrode fingers in a SAW resonator S1 in the ladder-type SAW device T1 for transmission is made lower than the ratio (LR / PR) of the width LR of electrode fingers to the pitch PR between the electrode fingers in a SAW resonator S2 in the ladder-type SAW device R2 for receiving. As a result, the SAW device D1 has a low loss within a band and has steep attenuation characteristics outside the band, and is miniaturized.

The invention discloses a semi-graphic base integrated waveguide 180 deg. three-decibel coupler with millimeter-wave and microwave element, which is characterized by the following: the first and second semi-graphic base integrated waveguides (4) and (5) are set on two sides of positive center line of dielectric base (1); the input end (41) and output end (42) are formed on two ends of first semi-graphic base integrated waveguide (4); the separating end (51) and coupling end (52) are set on two ends of second semi-graphic base integrated waveguide (5); a row of metal through-hole (3) is applied by the first and second semi-graphic base integrated waveguide (4) and (5) together as separating band with coupling sew (6); an upper metal notch (44) is set on the opening surface of first semi-graphic base integrated waveguide (4) at upper center of coupling sew (6); a lower metal notch (54) is set on the opening surface of second semi-graphic base integrated waveguide (5) at lower center of coupling sew (6).

The invention discloses a vertical substrate integrated waveguide and a vertical connection structure comprising the waveguide. The vertical substrate integrated waveguide comprises a dielectric substrate and metal layers, wherein the metal layers are attached to upper and lower surfaces of the dielectric substrate; the upper and lower surfaces of the dielectric substrate are parallel; multiple metalized through holes vertical to the dielectric substrate are formed in the dielectric substrate; the metal layers on the upper and lower surfaces cover the metalized through holes, and are etched with aperture structures which are the same and are corresponding upward and downward; and the metalized through holes are enclosed to form a closed structure along the aperture structures. The vertical substrate integrated waveguide can realize the vertical transmission of electromagnetic energy in the multilayer dielectric substrate.

The invention discloses a balanced type band-shaped dielectric substrate integrated filter. The balanced type band-shaped dielectric substrate integrated filter comprises a high-dielectric-constant dielectric substrate, and a first low-dielectric-constant dielectric substrate, a second low-dielectric-constant dielectric substrate and a metal ground which are symmetrically stacked on the upper and lower surfaces of the high-dielectric-constant dielectric substrate respectively. Compared with an existing balanced dielectric filter, the balanced type band-shaped dielectric substrate integrated filter is advantageous in that the high-Q-value strip-shaped dielectric substrate integrated resonator with a packaging characteristic which works in a TM111 mode, is mainly composed of a double-groove loaded strip-shaped dielectric block, and is combined with an upper-layer air groove structure, a lower-layer air groove structure and a packaging substrate is adopted, the problems that the cost is high and self-packaging cannot be realized when an existing balanced type dielectric filter is realized by combining a ceramic dielectric with a metal cavity structure are solved, and the balanced type band-shaped dielectric substrate integrated filter with low loss characteristics is realized; and meanwhile, the filter has the advantages of self-packaging, high integration level and low cost.

The present invention discloses an SIW-based three-beam antenna system, which comprises conversion branches, a network matrix and an antenna array. The conversion branches are mainly used for mode transition of an electromagnetic signal from a microstrip transmission line to an SIW area; three SIW coupling phase modulators and one phase shifting unit are used for combination into a three-in-three-out network; and each column of the antenna array is connected to one port of the network matrix and the number of units of each column is greater than or equal to one. An SIW structure realizes a lowconsumption characteristic of signal transmission. By connecting to the antenna array, a radiation beam along an axial line and two axisymmetric beams can be realized. This design has the characteristics of small loss, simple structure, wide application range and the like.