250 results about "Dielectric cylinder" patented technology

The invention discloses a millimeter-wave 360-DEG omnidirectional-scan dielectric cylinder lens antenna comprising three dielectric cylinder lenses, three feed source antenna arrays with scan ranges of 120 DEG and four round metal discs. One of the three dielectric cylinder lenses is respectively coaxially arranged among the four round metal discs, one of the three feed source antenna arrays is respectively arranged between the edges of two adjacent round metal discs, the difference between two of the three feed source antenna arrays on a horizontal projection surface is 120 DEG, and a phase central plane of each feed source antenna array is superposed with a focal plane of each dielectric cylinder lens. The invention realizes 360-DEG omnidirectional scan in the horizontal direction; the three dielectric cylinder lens antennas are partitioned by parallel round metal disc-shaped plates, and the scan of each homogeneous dielectric cylinder lens is not interfered by the other two lenses,thus the scanning beam of each layer of cylinder lens antenna is totally consistent; and the millimeter-wave 360-DEG omnidirectional-scan dielectric cylinder lens antenna can be conveniently connected with a printed integrated circuit. The millimeter-wave 360-DEG omnidirectional-scan dielectric cylinder lens antenna is applied to the fields of space flight communication, satellite communication, electronic countermeasure and the like.

An ion source, capable of generating high density wide ribbon ion beam, utilizing one or more helicon plasma sources is disclosed. In addition to the helicon plasma source(s), the ion source also includes a diffusion chamber. The diffusion chamber has an extraction aperture oriented along the same axis as the dielectric cylinder of the helicon plasma source. In one embodiment, dual helicon plasma sources, located on opposing ends of the diffusion chamber are used to create a more uniform extracted ion beam. In a further embodiment, a multicusp magnetic field is used to further improve the uniformity of the extracted ion beam.

The present invention discloses a miniaturized rubidium atomic frequency standard cavity-cell system, wherein, a microwave cavity cylinder is made from high magnetic permeability material; the microwave cavity cylinder is sleeved with a heating cylinder; a pump light incident port of the heating cylinder is also provided with a convex lens which gathers and transmits rays emitted by a rubidium spectral lamp into a microwave cavity; a C field coil is directly wound on a dielectric cylinder arranged between the microwave cavity cylinder and an absorption cell; a cusp on the tail part of a light-filtering cell is concentrated at the center of a circular plane at the end of the cell; a cusp on the tail part of the absorption cell is concentrated at the edge of a circular plane at the end of the cell; a photocell and a snap-off diode are fixed on the end face of the inner wall of a cavity end cover which can be movably fixed. The present invention has no machinery regulating rod inside the cavity, uses an intracavity frequency doubling mode, adopts a cylindrical TE111 mode and a dielectric filling method to get rid of the complex structure of a magnetic shield cylinder in the prior art, and reduces the volume of the cavity-cell system. As the pump light incident port of the heating cylinder is provided with the convex lens to increase the light intensity of pump light, the performance of the cavity-cell system is guaranteed. A mobile photoelectric component is adopted for cavity frequency fine adjustment, which is convenient for debugging and cannot cause field form distortion.

The invention discloses a T-shaped photonic crystal power divider, which belongs to the technical field of materials, and relates to application technology of photonic crystals. In the invention, based on the prior T-shaped photonic crystal power divider, one dielectric cylinder is added in the intersection of a vertical line defect and a horizontal line defect of a T-shaped line defect, and two dielectric cylinders most close to the added dielectric cylinder in the vertex position of two right-angle corners of the T-shaped line defect are removed respectively at the same time. Other dielectric cylinders can also be respectively added in the positions twice of a crystal cycle length which is constant a, from the added dielectric cylinder on the left side, the right side and the lower side, and three dielectric cylinders most close to the intersection of the vertical line defect and the horizontal line defect at the two right-angle corners of the T-shaped line defect are removed respectively at the same time. The improved T-shaped photonic crystal power divider has the advantages of high amplitude-frequency characteristic flatness in a pass band, reduction of interaction between two output ends of the T-shaped power divider and better practicability.

The invention provides a photonic crystal slow light waveguide based on a honeycomb structure. The photonic crystal slow light waveguide based on the honeycomb structure comprises a topology mediocrestructure and a topology non-mediocre structure, and the other part is composed of crystal cells which are arranged and have topology non-mediocre property. A relatively mild energy band appears in afirst Brillouin zone in an energy band structure, and transmission group velocity of light at the frequency is close to 0, so that slow light transmission is realized. An elliptical dielectric cylinder is made from a common dielectric material silicon, and production cost is low.

The invention discloses a novel topological photonic crystal structure and an optical waveguide, and a unit cell of the novel topological photonic crystal structure is formed by arranging six identical dielectric cylinders into two independent regular triangle units and has C3 rotational symmetry. A plurality of structural states of the crystal structure all have a dual Dirac cone cell, and energyband inversion and topological phase transition are achieved by stretching and compressing at least one of the two triangular units on the basis of each cell state having a dual Dirac cone, and a large topological non-mediocre photonic band gap is opened. An optical waveguide is also constructed based on the crystal structure, the topological non-mediocre photonic crystal (PC3) and the topological mediocre photonic crystal (PC1) are combined to support optical unidirectional transmission at the interface to inhibit backscattering, the transmission efficiency is extremely high, the immunity tostructural defects is strong, and three different structural defects can be perfectly passed.

The invention relates to a design method of a two-dimensional photonic crystal waveguide coupler, which comprises the following steps: firstly selecting photonic crystal forbidden band waveguides with coincident waveguide mode frequencies, and enabling the waveguide passages of an emergent waveguide and an incident waveguide to be aligned on the same straight line; selecting an incident light frequency within the waveguide mode coincident frequency range of the two photonic crystal forbidden band waveguides; selecting the distance between the emergent waveguide and the incident waveguide according to the requirement of a photonic integrated device; respectively arranging a row of dielectric cylinders as a waveguide modifying surface in front of the emergent surface of the emergent waveguide and in front of the incident surface of the incident waveguide, and setting parameters to be optimized; arranging a detector at the guide opening of the incident waveguide, wherein the width of the detector is equal to the width of a PBG waveguide passage; and optimizing the parameters by utilizing a genetic algorithm to finish the design of the two-dimensional photonic crystal waveguide coupler. The method of the invention is simple and easy to operate, the coupling efficiency of the designed waveguide coupler is high, and the coupling distance can be adjusted within a certain range.

The invention relates to a guided mode resonance wave shifting device for scintillation detection. The guided mode resonance wave shifting device comprises a substrate layer and a luminous film layer arranged on the substrate layer, and also comprises a photonic crystal layer arranged on the luminous film layer, wherein the photonic crystal layer consists of dielectric cylinders arranged into a period array in a triangular structure; the dielectric cylinders are vertically arranged on the upper surface of the luminous film layer; the materials of the dielectric cylinders are transparent for the light emitted by the luminous film layer. Compared with the prior art, the guided mode resonance wave shifting device has the advantages that the conversion efficiency and the time distinguishing capability are high; high light emission direction regulation and control capability is also realized; the detection efficiency on scintillation fluorescence such as ultraviolet rays can be improved.

The invention provides a cylindrical dielectric barrier discharge plasma propelling device comprising an N-layer cylindrical structure and a high voltage power supply; each layer of the cylindrical structure comprises an insulating dielectric cylinder, and an M-layer high voltage electrode and a M-layer grounding electrode which are staggeredly arranged at two side faces of the insulating dielectric cylinder; the high voltage electrode and the grounding electrode are connected to the high voltage power supply; two adjacent layers of a high voltage electrode and a grounding electrode form a dielectric barrier discharge plasma exciter. The main part of the device is the cylindrical structure which is simple and compact, and is light in weight and low in production cost; the device has no moving parts and has quick response and high reliability; through the voltage and frequency control of the high voltage power supply, the excitation intensity and power consumption can be flexibly set, and the pushing force can be accurately controlled. The direction of the pushing force can be adjusted through adjusting the axial direction of the cylindrical structure; when the device is applied in an aircraft, the moving velocity and moving direction can be accurately controlled without carrying fuel; long-term aerial hovering of aircrafts can be realized.

An energy conversion system is described and includes a cylindrical rotor having a mass and multiple magnets affixed on an outer face thereof; a cylindrical stator including a dielectric cylinder wound with copper wire in a predetermined configuration, the cylindrical rotor being placed within the cylindrical stator; and a rotatable shaft for rotating the rotor, the rotatable shaft being placed in the center of the cylindrical rotor. The system harvests environmental energy for lower power generation and accounts for non-mechanical sources of rotational resistance within the generator.

A photonic crystal of a two-dimensional graphene-like duplex structure comprises a tabulate base part. Primitive cell units are periodically arranged on the tabulate base part, and each primitive cell unit comprises a first dielectric medium and a second dielectric medium. Each primitive cell unit comprises a hexagon prism-shaped hollow structure which is formed by one first dielectric medium and a cylindrical dielectric cylinder which is axially arranged in each hexagon prism-shaped hollow structure, each hexagon prism-shaped hollow structure is filled with one second dielectric medium, and each second dielectric medium is filled into the gap between the corresponding hexagon prism-shaped hollow structure and the cylindrical dielectric cylinder. The cylindrical dielectric cylinders are arranged between the adjacent primitive cell units, and the cylindrical dielectric cylinders are made of the first dielectric media. The structure parameter is optimized, so that the maximal TE band gap rate of 55.89% is obtained so far. According to the photonic crystal of the two-dimensional graphene-like duplex structure, the duplex structure is introduced, compared with a simple periodic structure, forbidden band modulating controllability is higher, and it is of great significance to designing and manufacturing two-dimensional photonic crystals.

The invention discloses a four-channel terahertz wave signal selection switch based on magnetic photonic crystal. An input waveguide is formed by horizontally removing part of dielectric cylinders inthe middle of a complete photonic crystal with TE mode band gap, and four output waveguides are formed by removing part of dielectric cylinders in the longitudinal direction of photonic crystals and symmetrically in the upper and lower ends of the input waveguide. An odd number of dielectric cylinders are retained between the four output waveguides and the input waveguide respectively. The centraldielectric cylinder of the retained odd number of dielectric cylinder is replaced with a magnetic point defect dielectric cylinder, and the magnetic point defect dielectric cylinder form a magnetic point defect micro-cavity with the surrounding medium cylinders. The input waveguide inputs a terahertz wave and controls the magnitude of the applied magnetic field applied to the selection switch. When the resonant frequency of a magnetic point defect micro-cavity is the same as the frequency of the incident terahertz wave, the incident wave can be coupled to the corresponding output waveguide for output. The switch has the advantages of fast speed, small volume and easy integration. And with four channels, the incident wave can be output from any one of the output channels.

An ion source, capable of generating high-density wide ribbon ion beam, utilizing one or more plasma sources is disclosed. In addition to the plasma source(s), the ion source also includes a diffusion chamber. The diffusion chamber has an extraction aperture oriented along the same axis as the dielectric cylinder of the plasma source. In one embodiment, dual plasma sources, located on opposing ends of the diffusion chamber are used to create a more uniform extracted ion beam. In a further embodiment, a multicusp magnetic field is used to further improve the uniformity of the extracted ion beam.

The invention discloses a device and method for testing the microwave surface resistance distribution of a high-temperature superconducting thin film. The testing device comprises a testing seat, a fixing assembly, a calibration assembly and a sealing cover, and the working resonant mode is TE012. The testing seat comprises a shielding shell, an input coupling structure, an output coupling structure, a supporting ring, a dielectric cylinder and a metal circular ring. The testing seat is loaded with the tested superconducting thin film to constitute a resonator. The fixing assembly is used for fixing the tested superconducting thin film, and the sealing cover is used for isolating the inside and the outside of the resonator. The device and method for testing the microwave surface resistance distribution of the high-temperature superconducting thin film have the advantages that the contradiction among the resolution ratio, the sensitivity and the universality of the testing device in the microwave surface resistance distribution test of the superconducting thin film is solved; the tested superconducting thin film can be effectively prevented from being pressed to be damaged; direct coupling can be effectively avoided, and high testing precision is achieved.

The invention discloses a photonic crystal all-optical tunable filter. The tunable filter is of a two-dimension photonic crystal structure and comprises three ports, a signal light and controlling light input waveguide, a signal light output waveguide and a controlling light output waveguide. Two photonic crystal defect cavities are symmetrically formed in the intersection position of the three waveguides, and a movable dielectric cylinder is arranged in each photonic crystal defect cavity. Several dielectric cylinders are respectively removed from the upper portion and the lower portion of each photonic crystal defect cavity, and the upper portions of the photonic crystal defect cavities and the controlling light output waveguide form an odd mode output structure, and the lower portions of the photonic crystal defect cavities and the signal light output waveguide form an even mode output structure. The photonic crystal all-optical tunable filter is simple in structure, high in response speed, high in anti-interference performance and easy to integrate with other optical logic elements.

The invention discloses a medium array antenna. The medium array antenna is characterized by adopting dielectric cylinders (1) as an antenna radiation unit; multiple dielectric cylinders (1) are arranged into an antenna array at certain intervals, so as to realize high gain; the array antenna realizes uniform amplitude in-phase feed to the medium columns by adopting a micro-strip parallel feed network (5); the micro-strip parallel feed network (5) is printed on a dielectric layer (3) of a printed circuit board; an inner conductor of a coaxial cable (6) penetrates through a metal layer (4) and the dielectric layer (3) and is connected with the micro-strip parallel feed network (5); an outer conductor of the coaxial cable (6) is connected with the metal layer (4); the tail end of each dielectric cylinder is provide with a metal sleeve (2), each metal sleeve is welded on a round metal patch (10), and the round metal patches are printed on the dielectric layer; on one hand, the metal sleeves are used for fixing the dielectric cylinders; on the other hand, the metal sleeves are used for guiding electromagnetic energy to be spread onto the dielectric cylinders.

The invention discloses a directional coupler for photonic crystals. The directional coupler comprises a base board and a plurality of dielectric cylinders, wherein the dielectric cylinders are vertically arranged on the base board. A main waveguide line defect and a coupling waveguide line defect which are mutually independent are enclosed by the dielectric cylinders, at least one row of runway-shaped dielectric cylinders are spaced between the main waveguide line defect and the coupling waveguide line defect, and the rest dielectric cylinders are cylindrical. The directional coupler has the advantages that the coupling cycle of electromagnetic waves in the directional coupler is greatly shortened, so that the size of the coupler is reduced, the directional coupler is small in size, compact in structure, high in efficiency and integration level and the like, and an effective way for manufacturing a waveguide coupler and a wavelength division multiplexing device with smaller channel intervals on the fixed size is provided as the coupling cycle is shortened.

The invention discloses a complete forbidden band photonic crystal structure. The complete forbidden band photonic crystal structure comprises an air-hole type photonic crystal structure located on the bottom layer and a dielectric-cylinder type photonic crystal structure located on the upper layer. The air-hole type photonic crystal structure and the dielectric-cylinder type photonic crystal structure are both arrays periodically arranged by dielectric materials with two or more than two dielectric constants on a plane. The dielectric material of dielectric-cylinder type photonic crystal structure is correspondingly arranged on the surface of the material of the air-hole type photonic crystal structure. A preparation method of the photonic crystal structure and a luminous diode adopting the photonic crystal structure are also disclosed. The photonic crystal structure has the advantages that a property of a complete photo forbidden band in an LED (light-emitting diode) light band is achieved, luminous efficiency of the LED is improved greatly, structural parameters of the photonic crystal can be adjusted freely, application value in the field of the LED is expanded, stress produced by lattice mismatch is released effectively, and GaN-based epitaxial thin films with higher quality is achieved.