103 results about "Cylindrical wave" patented technology

Analyzing interactions between vias in multilayered electronic packages that include at least two spaced-apart conducting planes, and multiple vias that connect signal traces on different layers. Voltages at active via ports are represented as magnetic ring current sources, which generate electromagnetic modes inside the plane structure. Substantial electromagnetic coupling between vias occurs. A full-wave solution of multiple scattering among cylindrical vias in planar waveguides is derived using Foldy-Lax equations. By using the equivalence principle, the coupling is decomposed into interior and exterior problems. For the interior problem, the dyadic Green's function is expressed in terms of vector cylindrical waves and waveguide modes. The Foldy-Lax equations for multiple scattering among the cylindrical vias are applied, and waveguide modes are decoupled in the Foldy-Lax equations. The scattering matrix of coupling among vias is then calculated for use in determining signal reflection, transmission, and/or coupling in the electronics package.

A mass notification system (MNS) loudspeaker having very high intelligibility. The MNS loudspeaker includes a plurality of transducers arranged in a symmetric pattern around an axis, so as to produce a substantially cylindrical wave front of sound pressure. The loudspeakers are coupled to a cap, and form a cylinder whose inner diameter is large enough to slip over a pole to which the loudspeakers are to be mounted. The under side of the cap may rest atop the pole. An inner cylinder encloses an air volume behind the transducers for acoustic loading and environmental protection of the transducers. An optional telescoping stand retracts into the inner cylinder.

The invention discloses a frequency-control wave beam/focal point scanning plane reflective array/reflector. The basic structure of the plane reflective array and the basic structure of the reflector respectively comprise a printed patch array, a primary feed source and a corresponding supporting structure. The plane reflective array is irradiated by spherical waves, focusing of wave beams is realized in a far field, and the plane reflective array can be used in a modern wireless communication system and a modern radar system. The reflector is irradiated by plane waves or cylindrical waves or spherical waves, can realize wave beam focusing in a near field and can be applied to an imaging system. The plane reflective array and the reflector respectively enable the phase value actually obtained on each frequency point to meet the theoretically required value through selection of the size and freedom degree parameters of each unit, therefore, in-phase superposition, in different directions, of the array at different frequency points is realized, and the function of wave beam or focal point scanning is achieved. The frequency-control wave beam/focal point scanning plane reflective array/reflector has the advantages that electric wave beam/focal point scanning and high gain are realized through the simple array surface structure, and the cost, the loss and the complexity of a current scanning array/imaging system are greatly reduced.

The invention discloses a broadband wire source for a planar waveguide CTS antenna feed device. The broadband wire source comprises an H-plane sectorial horn antenna, a bias parabolic reflection plane and a flat waveguide. The H-plane sectorial horn antenna and the bias parabolic reflection plane are arranged inside the flat waveguide, and the phase center of the H-plane sectorial horn antenna is arranged at the focus of the bias parabolic reflection plane. According to the invention, cylindrical waves are converted into plane waves, the plane waves are generated by using a reflector antenna principle, and the horn antenna is arranged at the focus of a paraboloid reflector so that a horn antenna radiation field passes through the reflector and generates the plane wave with equal amplitude and the same phase at the caliber surface of the reflector. The working frequency band is wide; the feed source shielding is eliminated and the caliber efficiency is enhanced through a bias; the structure is enclosed so that the edge diffraction effects of a conventional bias paraboloid are removed; and the structure is simple so that adjusting and assembling are easy, late use and maintenance are convenient, and the problem can be solved that the ideal wire source with equal amplitude and the same phase, generated by a conventional waveguide CTS antenna, cannot be realized in an actual project.

The invention relates to an antenna directional pattern testing method based on spherical surface near-field scanning extrapolation. Through near field testing, a far-field directional pattern can be obtained by subjecting obtained data to arithmetic extrapolation, so the testing distance is reduced and plane wave conditions required by cylindrical wave test are not required. A three-dimensional direction pattern obtained finally can analyze performance of an antenna more clearly and visually, and has great engineering practical value. The testing method can realize effective close-range antenna testing, saves testing cost, lowers testing difficulty, and meanwhile aims to obtain the three-dimensional direction pattern of a tested antenna so as to analyze performance of the antenna more accurately.

The invention discloses a deformation luneberg lens based on novel metamaterials. The lens is formed by the way that fifteen layers of round dielectric sheets are arrayed in the radial direction in an equally-spaced mode, and I-shaped metal structure units are periodically distributed on each layer; the sizes of I-shaped structures which are attached to the sheets far away from the center of the lens are smaller and smaller, and the equivalent dielectric constants are smaller; the equivalent dielectric constant of the outermost layer is one approximately, the equivalent magnetic conductivity is also one approximately, and thus the air layer attaching purpose is achieved. Compared with a traditional luneberg lens, the deformation luneberg lens is changed in that the position of a feed source is varied, and a round rail is arranged in the deformation luneberg lens to allow the feed source to move. A cylindrical wave generated by the feed source is emergent in the mode of a plane wave under the action of the lens, the emergent direction of the plane wave is changed along with the movement of the feed source on the rail, and thus wide-angle scanning of beams is achieved. The deformation luneberg lens based on novel metamaterials is simple in design and manufacture and capable of converting the cylindrical wave into the plane wave, thereby having a wide application prospect in the fields of radar, antennas and the like.

A phase mask method to geometrically transform and to optically transfer a standard planar radial grating pattern into a cylindrical photoresist pattern at the circularly cylindrical wall of a given element. The planar radial grating pattern can be written with an integer number of lines having strictly constant period without any stitching problem. The photolithographic transfer is made by an illumination device providing a normal incident beam on the phase mask. The annular radial grating diffracts this normal incident beam, formed by plane waves, into two cylindrical waves of the first diffraction order (Tr₊₁ and Tr₋₁)) which impinge on the circularly cylindrical wall and interfere in a photoresist layer deposited on the circularly cylindrical wall to give rise to an interferogram.

The invention relates to a self-adaptive acoustic imaging method. The method includes the steps that acoustic wave signals are received after being transmitted at fixed focuses through an acoustic transducer array; focusing beamforming processing is carried out on the acoustic wave signals received by each array element in the acoustic transducer array to obtain acoustic radio frequency scanning line data; the focuses are used as virtual sources in synthetic aperture processing, tine delay from each virtual source to the spatial point is calculated by means of a cylindrical wave propagation model, and spatial point-by-point focusing is carried out on the scanning line data; self-adaptive weighting is conducted on the result of the spatial point-by-point focusing by the adoption of correlation coefficients or generalized correlation coefficients, the proportion of coherent components is increased, and the proportion of incoherent component is reduced; image transformation is carried out on all the scanning line data after self-adaptive weighting conducted on the result of the spatial point-by-point focusing to obtain images. According to the method, the lateral resolution and contrast ratio which are identical in depth are achieved, the number of sidelobes is effectively reduced, and therefore all-round improvement in acoustic imaging quality is achieved.

A lighting module for a motor vehicle headlight, designed to give a beam with cutoff, and comprising at least one light source, a collecting mirror, a bender having a reflective surface and a cutoff edge, a return mirror, for producing towards the front the output beam with cutoff the surfaces of the collecting mirror, of the bend and of the return mirror being conjugate surfaces such that the collecting mirror converts a spherical wave issuing from the center of the source into a wave surface reducing to a two-dimensional curve, convex towards the front, the cutoff edge of the bender is merged with this curve, the return mirror converts the above wave surface into at least one cylindrical wave surface of vertical axis having as its cross-section a curve.

The invention discloses a near field backward RCS measuring system and method based on a chain relation formula; the method uses a line source vertical to the ground to form cylindrical waves, and a cylindrical surface field satisfies far field conditions only in the height direction; in order to reduce side wall interference clutters, a conical microwave darkroom is designed; the cylindrical surface field rear wall echo level is smaller than a compact field by 10dB, thus setting the darkroom door in the rear wall, and facilitating target transport. The invention provides a near field RCS measuring radar system comprising a target and environment portion, a microwave amplitude and phase measuring portion, and a NFFFT and high resolution imaging portion; the invention also provides a near field RCS measuring method comprising the following steps: support and environment vector background cancellation, measuring near field scattering coefficient FN scaling, and secondary scaling of the NFFFT and in a NFFFT process. The advantages are that 1, NFFFT transformation is simplified from two-dimension into one-dimension; 2, multi-diffraction in the horizontal direction of the target will cause errors; 3, interference clutters caused on the darkroom ground, roof slits and steps can be reduced.

Radial input waveguide is provided having three consecutive sound wave propagation passageways, virtually divided by two folding regions along its extension from radial input up to substantially rectangular output, each one forming a different type of waves and all three channels shaped between an internal body and a shell housing enclosing it at a distance. The radially expanding initial air channel forms a cylindrical wave front between two input walls. A relatively wide region with parallel walls is available for wave folding at adaptably changeable diameters in this region with a small distance between the folded walls. All individual partial wave fronts on the periphery of the first folding region are traveling along substantially equal, accumulated from the last two air channels, path lengths, to the waveguide output, forming there a common isophase and planar wave front. The middle passageway contains all the physical dimensions necessary to control the waveguide performance, the most important being the height H and the width D, whose ratio controls the wave front output curvature.

The invention belongs to a resonant cavity matched with a microwave plasma depositing device so as to be used for depositing the diamond film, which includes a resonant cavity body comprising a hemispherical metal cavity and a box-shaped metal cavity, a cylindrical wave-guide input pipe and a mode conversion antenna thereof, a depositing platform arranged on the bottom plane of the box-shaped inner cavity as well as a reaction gas inlet and a vacuum pump interface which are respectively arranged on two side walls of the cavity body. The inner spherical surface in the resonant cavity is equivalent to a concave mirror; however, the bottom surface of the box-shaped metal cavity is equivalent to a flat mirror; when microwave emitted by a magnetron is radiated into the resonant cavity through the mode conversion antenna and reflected backwards and forwards between the hemispherical inner wall and the bottom surface of the box-shaped cavity, most energy is centralized into the middle part ofthe inner cavity so as to excite stable large-area plasma; therefore, the microwave plasma resonant cavity used for depositing the diamond film has the characteristics that the simple structure is simple, which can effectively reduce the size of a system matched thereof, and cooling is convenient; the concentration ratio of the regions with stronger field strength is high and the area thereof islarger; moreover, the Q value of the cavity body is high, which is beneficial to depositing a large-area diamond film and improving the quality thereof, etc.

The invention discloses an impedance matching high-gain lens antenna and a design method thereof. The impedance matching high-gain lens antenna comprises an impedance matching lens and an H-plane fanhorn antenna for loading a waveguide extension, wherein the aperture of the H-plane extension horn antenna is connected with the waveguide extension having the same aperture diameter for fixing the impedance matching lens; and the waveguide extension has a length equal to the width of the impedance matching lens for fixing the impedance matching lens and completely covering the side of the impedance matching lens. An electromagnetic wave signal excited from a signal source radiates a cylindrical wave through the H-plane fan horn antenna. The phase of the cylindrical wave is corrected by the impedance matching lens so that the cylindrical wave is converted into a two-dimensional plane wave having an equiphase surface perpendicular to the propagation direction and finally radiating to the free space. The lens antenna has a working frequency bandwidth, low loss, high gain, good far-field directionality, low sidelobe level, a small size and the like, can work normally in the X-band, and has high practicality in electromagnetic imaging and communication fields.

The invention discloses a TE011-lambada/4-pi mode resonator with a three-dimensional structure. Two output ends of each active circuit are connected with two open-circuit ends corresponding to the lambada/4 resonator at the junction of a silicon chip layer and a packaging layer; two short-circuit ends of each lambada/4 resonator are connected with TE011 cylindrical wave guide resonator on a firstconducting metal plate, and realize energy coupling with a cylindrical wave guide coupling groove seam by the lambada/4 resonator of the first conducting metal plate; a rectangular wave guide is assembled above a second conducting metal plate, and the two short-circuit ends of each lambada/4 resonator realize energy coupling with the cylindrical wave guide coupling groove seam by the rectangular wave guide of the second conducting metal plate, and output energy. The TE011-lambada/4-Pi mode resonator is suitable for power synthesis of silica-based Terahertz sources at the surface of the packaging layer, a passive circuit is separated from the active circuit, the quality factors of the resonator are higher, scale production can reduce the cost obviously, and the TE011-lambada/4-Pi mode resonator has application values in the fields of Terahertz personal wireless communication, low-power radars and the like.

The invention discloses a determination method for the speed of earth surface vibration caused by cylindrical waves in rock, and belongs to the technical field of rock mechanics. The method comprisesthe steps of firstly building a plane analysis model, and acquiring a real-time wave beam of a body wave at any point on the earth surface according to a ray theory and the attenuation characteristicof the cylindrical waves; and acquiring real-time speed of reflected P and S waves according to reflection characteristics of the cylindrical waves on a free surface, and then computing the speed of the earth surface vibration caused by the joint effect of incident waves and reflected waves according to a propagation direction of each wave; then, acquiring the speed of surface waves and the earthsurface vibration caused by the surface waves via a speed difference between any two adjacent points on the earth surface; and at last, acquiring the earth surface vibration speed according to a superposition principle. According to the method, the theorical comparison verification method is provided for an earth surface vibration response test or a numerical simulation research, prediction on thevibration of the engineering blasting surface is facilitated, and reference is provided for related rock engineering.

The invention discloses a rotary wave absorbing device and a wave absorbing method. The device comprises an anchor block sinking into the sea and a floating body floating in the sea. The floating bodyis fixedly connected to a sliding part which sleeves a fixed rod and can slide up and down along the fixed rod through a rigid rod; a cylindrical wave absorbing rotor is arranged between the floatingbody and the anchor block; two through holes are symmetrically formed in the center of the cylindrical wave absorbing rotor; a rope is threaded in each through hole; one end of the two ropes which are twisted together is fixedly connected to the anchor block while the other end is fixedly connected to the floating body; more than two rigid round bars are arranged in an equally spaced manner circumferentially on the side face of the cylindrical wave absorbing rotor; and a wave breaking ball body is mounted at the tail end of each rigid round bar. The rotary wave absorbing device disclosed by the invention is simple in structure, does not consume energy resources in operation, is good in economical benefit, high in efficiency and free of secondary pollution, and is significant for protecting marine buildings by cutting down waves by means of wave energy.

The embodiment of the invention provides an ultrasonic imaging device. The device comprises a probe circuit, a transmission module, a receiving module, a data processing module and a display/operation module. The transmission module is used for transmitting ultrasonic waves by means of two or more array elements of the probe circuit according to an operation instruction received from the display/operation module to form non-focused cylindrical waves. The receiving module is used for receiving the cylindrical waves transmitted by the transmission module by means of the probe circuit. The data processing module is used for forming a dual point-by-point focus image from the cylindrical waves received by the receiving module through aperture synthesis, and the image is displayed through the display/operation module. The power consumption of the ultrasonic imaging device can be reduced.

The invention discloses a spot size converter. A Fresnel micro lens based on a metasurface structure is adopted, a first metasurface structure comprises a plurality of sub-wavelength grooves which are etched in a waveguide material and are the same in length and different in width, and a second metasurface structure comprises a plurality of sub-wavelength grooves which are etched in the waveguide material and are the same in length and width; the combined use of the two metasurface structures can reduce the size of the device, and also avoids the step of etching the extremely small line width, thereby reducing the technological requirements. The mode field width of single-mode input light can be changed under the condition that the mode order of the single-mode input light is maintained. A wide-spot fundamental mode beam can be changed into a cylindrical wave to realize a beam bunching function, or the cylindrical wave can be changed into a wide-spot fundamental mode beam to realize a beam expanding function. The mode field of the wide-spot fundamental mode can be widened by increasing the period number of the Fresnel micro lens, and the actual requirements of various application scenes can be met. The spot size converter can realize the functions of a beam splitter, a collimator and the like, and is suitable for different application scenes.

A method and an apparatus for detecting a cylinder and a cylindrical converging lens are disclosed. In particular, a method for non-contact interference detection of a cylindrical shape is disclosed. Two converging lenses which modulate parallel light into cylindrical waves are combined with a to-be-tested cylinder respectively. Wavefront error data of the combination of the converging lens and the to-be-tested cylinder and wavefront error data of the combination of the two cylindrical converging lenses are obtained. Shape error data of the to-be-tested cylinder, the two cylindrical converging lenses is obtained respectively by using a difference algorithm and a wavefront recovery algorithm. In the technical solution, a detection light path is simple, and shape detection of a cylinder with relatively high precision can be implemented without using a high-precision detection tool calibrated in advance. The technical solution is particularly suitable for cylinder processing in the field of optical processing.