23 results about "Square waveguide" patented technology

The invention discloses a polymer encapsulation system-based tamponade type flexible optical waveguide integrated optical genetic probe, the appearance of an implantation part of the probe is of a flat tamponade structure, and the probe comprises a cuboid trunk and a crown which is positioned at the tail end of the trunk and is formed by nesting and stacking at least two layers of prisms with tips; the internal structure of the optical genetic probe comprises a polymer cladding and a waveguide core layer; the waveguide core layer is located inside the polymer cladding or above the polymer cladding; the refractive index of the waveguide core layer is greater than that of the polymer cladding layer. The tower-loose structure of the probe can disperse the tip stress of the probe during implantation, protect the functional units distributed at the extension part of a tree crown, and prevent the layering of the probe structure from causing the peeling, damage and failure of the functional units; after implantation, tooth-shaped anchoring is formed between the extending part of the tree crown and the brain tissue, stronger interaction is generated, probe displacement caused by micro-motion in the brain tissue is effectively resisted, and the stability of long-term signal acquisition sites is ensured.

The utility model provides a waveguide array antenna applied to a Ka frequency band, which comprises an upper layer waveguide power division network and a lower layer waveguide power division network, a plurality of square waveguide corrugated horn antenna units are arranged on the upper sides of the upper layer waveguide power division network and the lower layer waveguide power division network, and metal cross grids are arranged on the upper sides of the square waveguide corrugated horn antenna units. An orthogonal mode coupler is arranged between the square waveguide corrugated horn antenna unit and the upper-layer waveguide power division network, a directional coupler is arranged between the orthogonal mode coupler and the upper-layer waveguide power division network, and a bottom port of the square waveguide corrugated horn antenna unit is connected with a top port of the orthogonal mode coupler. The antenna has the advantages of low loss at a high frequency band, high gain, high efficiency and low profile, and has a good application prospect in satellite communication.

The invention discloses an ultra wide band antenna array with in-band low scattering characteristic, which comprises horn antenna units, each horn antenna unit is of a square structure from top to bottom, each horn antenna unit comprises a square waveguide, a ridge structure, a square metal cavity and a polarization conversion unit, the horn antenna unit is equally divided into four areas, and the square waveguide is located at the lower part of the horn antenna unit and is smaller than the horn antenna unit; the square metal cavity is positioned at the upper part of the horn antenna unit and above the square waveguide, and is consistent with the horn antenna unit in size; four cuboids with the same size are arranged in the square metal cavity and are distributed on the inner sides of four corners of the square metal cavity; the polarization conversion units are located at the four corners of the horn antenna unit, and each polarization conversion unit is located above the corresponding cuboid with the same size. The antenna array provided by the invention has the characteristics of ultra-wideband radiation and in-band low scattering at the same time.

The application discloses a device and a method for measuring the local density of states of a sound field, and the measuring device comprises a sound source, a square waveguide, a MEMS silicon microphone and an acoustic vector sensor; one end of the square waveguide is connected with the sound source, and the other end is embedded with the MEMS silicon microphone and the acoustic vector sensor which are attached to the inner wall of the square waveguide. By measuring the particle velocity of the end surface of the waveguide, the volume flow rate of the waveguide into the measured structure can be obtained, and the local density of states of the measured structure can be calculated by combining the sound pressure obtained by the MEMS silicon microphone. The application overcomes the difficulty that the volume flow rate of the sound source in a narrow area cannot be accurately measured by using the vector detection technology, realizes the experimental measurement of the local density of states of the sound field, can be applied to the characterization of acoustic structural materials, and provides guidance for the design of acoustic radiation structures.

A preparation and coupling optimization method of bar SOI waveguide using end face coupling belongs to the field of micro-nano fine structure processing and optical precision measurement. Through two-step photoetching and two-step etching, on one hand, the base section plane highly coinciding with the waveguide end face can be etched, and on the other hand, the etching widening of the Si base etching channel cannot cause the waveguide below to be hollowed out. By using the DC magnetron sputtering Cr mask, the waveguide material can be prevented from being etched and damaged in the deep silicon etching process. Through the ion beam etching process, the waveguide end face and the base etching sidewall are completely coincided, so that part of the light spot is avoided from being scattered by the Si base in the optical fiber coupling process, and the coupling efficiency of the waveguide is improved. By combining the FDTD simulation results, the ICP-PECVD is used to deposit the low internal stress SiO2+Si3N4 antireflection film with a suitable thickness on the waveguide end face, the light spot is avoided from being reflected on the waveguide end face, and the light spot coupling efficiency is maximized.

The application relates to a dual-polarized antenna isolation feeding structure and a high-isolation dual-polarized horn antenna, and belongs to the microwave technical field.The dual-polarized antenna isolation feeding structure comprises a waveguide seat, a first feeding waveguide, a second feeding waveguide, a first feeding socket with a first socket inner core and a second feeding socket with a second socket inner core, the first feeding waveguide is a square waveguide, and the second feeding waveguide is a rectangular waveguide; the first feeding waveguide and the second feeding waveguide are arranged in the waveguide seat; the first feeding socket is connected to a first position of the waveguide seat; the second feeding socket is connected to a second position of the waveguide seat; the distance between the projection points of the first position and the second position on the length direction axis of the waveguide seat is L1, L1=(1 / 3~2 / 3) * lambda1; lambda1 is the wavelength of the nominal center frequency of the antenna. The dual-polarized antenna isolation feeding structure provided by the application can improve the isolation degree of the port without increasing the manufacturing difficulty and cost.

Systems and methods are provided for an integrated chip. An integrated chip includes a package substrate including a plurality of first layers and a plurality of second layers, each second layer being disposed between a respective adjacent pair of the first layers. A transceiver unit is disposed above the package substrate. A waveguide unit including a plurality of waveguides having top and bottom walls formed in the first layers of the package substrate and sidewalls formed in the second layers of the package substrate.

The application discloses an electrically pumped complex-coupled distributed feedback laser resonant cavity and a laser, and the laser resonant cavity comprises a gain material layer; a first doped cladding buffer layer is arranged above the gain material layer, the first doped cladding buffer layer is formed into a waveguide ridge with a middle protrusion through etching, a surface layer of a remaining area on both sides of the waveguide ridge is provided with a dielectric isolation layer, and a top surface of the dielectric isolation layer is a plane; a second doped cladding buffer layer is arranged below the gain material layer; a first Bragg array is arranged on a surface layer of both sidewalls or both sides of the remaining area of the waveguide ridge; a second Bragg array is arranged on the dielectric isolation layer; a first electrode is arranged on a top surface of the waveguide ridge; and a second electrode is arranged on a bottom surface of the second doped cladding buffer layer. When the current is injected through the N-type metal electrode and the P-type metal electrode and the current density of the laser reaches above a threshold value, the laser can realize stable single-frequency laser output and has strong resistance to external echoes.

A radar system for locating buried pipes and detecting underground liquid leaks, particularly water leaks, with a square waveguide antenna for emitting orthogonally polarized signals of the same frequency. The invention essentially consists of a radar system (1) with an antenna (4) capable of emitting waves at a nominal frequency towards the ground with two distinct and orthogonal polarizations, and incorporating a measuring element (5) capable of measuring the polarimetric ratio of the received signals according to the two polarizations, in order to deduce from the imbalance between the two received signals the presence of a buried pipe, and where applicable, the presence of liquid leaks, particularly water leaks. Figure for the abstract: Fig. 1

The utility model discloses a waveguide circular polarizer, and relates to the technical field of waveguide antennas, the waveguide circular polarizer comprises an input feeder structure and an output circular polarizer, the cross section of the input feeder structure is rectangular, and the input feeder structure is used for guiding electromagnetic waves; the output circular polarizer comprises an input linear polarization component transmission structure, an orthogonal linear polarization transmission structure and a square waveguide structure, and the input linear polarization component transmission structure is arranged on one side of the input feeder line structure in the first direction and is connected with the input feeder line structure; the orthogonal linear polarization transmission structure is arranged at an interval of the input linear polarization component transmission structure in the second direction and is connected with the input linear polarization component transmission structure, and the square waveguide structure is arranged on one side, far away from the input feeder line structure, of the input linear polarization component transmission structure and the orthogonal linear polarization transmission structure in the first direction; and the square waveguide structure is connected with the input linear polarization component transmission structure and the orthogonal linear polarization transmission structure, and is used for connecting a circular polarization signal line. Therefore, the waveguide circular polarizer is simple in structure and small in size.

The invention relates to an analytical biochip and a forming method thereof. The analytical biochip comprises a substrate, a lower cladding layer, a waveguide, an upper cladding layer, an emitted light collecting element and a plurality of nano-wells. The lower cladding layer is located above the substrate. The waveguide is over the lower cladding layer. The upper cladding layer is over the waveguide. An emitted light collecting element is over the upper cladding layer, where the emitted light collecting element includes a lower protruding structure extending into the upper cladding layer, and the emitted light collecting element is made of metal. The nano well penetrates through the emitted light collecting element and is located in the upper cladding layer. The emitted light collection element may be used to increase the emitted light collection ratio of the sample in the nanowell.

A head-mounted, near-eye display system comprises a stack of waveguides having integral spacers separating the waveguides. The waveguides may each include diffractive optical elements that are formed simultaneously with the spacers by imprinting or casting. The spacers are disposed on one or more major surfaces of the waveguides and define a distance between immediately adjacent waveguides. Adjacent waveguides may be bonded using adhesives on the spacers. The spacers may fit within indentations of overlying waveguides. In some cases, the spacers may form one or more walls of material substantially around a perimeter of an associated waveguide. Vent holes may be provided in the walls to allow gas flow into and out from an interior volume defined by the spacers. Debris trapping structures may be provided between two walls of spacers to trap and prevent debris from entering into the interior volume.

The invention discloses a biochip. The biochip comprises a substrate and a waveguide core layer, and the waveguide core layer is arranged above the substrate. The waveguide core layer includes a first grating coupler. The biochip also includes a hydrogel that is cross-linked via hydrogel cross-linking light, the hydrogel cross-linking light being coupled by a first grating coupler.

The application relates to the technical field of waveguides, and particularly discloses a novel simple millimeter wave microstrip waveguide transition structure and a preparation process of a waveguide, which comprises a printed component, a waveguide, a metal base, metal screws and a positioning pin, the printed component is fixedly connected with the metal base and located above the metal base, the waveguide is fixedly connected with the printed component and located above the printed component, the metal screws penetrate through the waveguide, the printed component and the metal base, and the positioning pin penetrates through the waveguide, the printed component and the metal base in sequence. The microstrip line to the strip line conversion effectively reduces the transmission loss and the influence of medium radiation, the strip line transition to the microstrip probe is adopted to couple and excite the rectangular microstrip antenna, the transmission direction of the electromagnetic field is changed from the tangent direction to the normal direction, the microstrip antenna and the waveguide end matching are adopted to realize the low-loss energy transmission.

The application discloses a three-dimensional water-based frequency selective absorber with switchable electromagnetic properties, comprising a plurality of symmetrically designed three-dimensional gradient structure medium square waveguide frequency selective surface unit structures and periodic water-based metamaterial absorber units; the three-dimensional gradient structure medium square waveguide frequency selective surface unit structure has wideband transmission performance with high frequency selectivity; the periodic water-based metamaterial absorber unit is encapsulated around the frequency selective surface unit structure and has super wideband absorption performance; three transmission poles and two transmission zeros are generated in the three-dimensional gradient structure medium square waveguide frequency selective surface unit structure through cascading three metal square rings in an up-down mode, so that a high-frequency-selectivity wideband three-dimensional frequency selective surface is realized; the transmission out-of-band absorption and the conversion of reflection electromagnetic characteristics are realized by controlling the on-off of water in the periodic water-based metamaterial absorber unit. The application expands the transmission bandwidth, has wide absorption frequency band and high absorption rate, and can realize dual polarization.

The invention discloses a high-power microwave energy transmission window and a design method, and relates to the technical field of high-power microwave energy transmission windows.The energy transmission window comprises an input square waveguide, a first transition waveguide, a window piece, a second transition waveguide and an output circular waveguide which are connected in sequence; the input square waveguide is connected with the first transition waveguide through a TE10-TE01 mode converter; metal diaphragms are arranged between the TE10-TE01 mode converter and the first transition waveguide and between the second transition waveguide and the output circular waveguide. The TE10-TE01 mode converter is obtained by optimizing a compact 135-degree bent waveguide and a compact one-to-two waveguide; the first transition waveguide and the second transition waveguide are Fourier series outline TE01 transition waveguides; the compact high-efficiency TE10-TE01 mode converter is reduced by about 60% in volume compared with the traditional mode converter of the type; the length of the Fourier wave series contour transition waveguide is shortened by more than 50% compared with that of a conventional conical transition waveguide.

The invention belongs to the technical field of square waveguide internal field distribution calculation, and particularly relates to a method for determining field distribution of any three-dimensional curved section in a square waveguide, which comprises the following steps of: S1, under a rectangular coordinate system, obtaining a two-dimensional reference plane square waveguide TEmn mode two-dimensional solution based on a variable separation method, establishing a three-dimensional regular curved surface, and determining the field distribution of any three-dimensional curved section in the rectangular coordinate system; initializing intrinsic waves propagated from the two-dimensional reference plane to the three-dimensional regular curved surface; s2, calculating an electromagnetic field of a ray propagated to a corresponding position of the three-dimensional regular curved surface according to a ray propagation optical path, establishing a mapping relation between three-dimensional curved surface waveguide port mode field distribution and two-dimensional plane mode field distribution, determining mesh division lengths on an X axis and a Y axis, performing mesh division, determining the position of each mapping point of the three-dimensional regular curved surface in a mesh, and determining the position of each mapping point of the three-dimensional regular curved surface; and an electromagnetic field thereof; and S3, on the basis of a rectangular coordinate system, the local coordinate axis vector is recalibrated through a differential geometry method, and then coordinate transformation is performed on the electromagnetic field of each mapping point on the three-dimensional regular curved surface to obtain an electromagnetic field component.

Systems and methods are provided for an integrated chip. An integrated chip includes a package substrate including a plurality of first layers and a plurality of second layers, each second layer being disposed between a respective adjacent pair of the first layers. A transceiver unit is disposed above the package substrate. A waveguide unit including a plurality of waveguides having top and bottom walls formed in the first layers of the package substrate and sidewalls formed in the second layers of the package substrate.

The invention discloses a compact broadband waveguide partition plate circular polarizer, and belongs to the field of waveguide radio frequency devices. The device comprises a pair of E-surface 90-degree turning waveguides, a common square waveguide and a stepped partition plate, wherein the E-plane 90-degree turning waveguide is used for inputting signals to the common square waveguide, and a stepped partition plate with a notch is arranged in the center of the common square waveguide. According to the invention, the notch is arranged on the stepped partition plate, so that effective suppression of a high-order mode TE11 mode in a square waveguide is realized, and the waveguide partition plate circular polarizer breaks through the limitation of 20% of the working single-mode bandwidth of the square waveguide. The broadband circularly polarized waveguide antenna has the advantages of simple and compact structure, large working bandwidth, high circularly polarized signal quality and no high-order mode resonance, and is suitable for various circularly polarized waveguide antenna systems requiring broadband performance, high compactness and high integration.

This invention discloses a dual-frequency dual-polarization reflective array antenna suitable for 3D metal printing, comprising an array surface and a feed source. The array surface includes several dual-frequency dual-polarization antenna elements. Four high-frequency elements of the same size are arranged in a 2×2 close-fitting manner to form a low-frequency element. The high-frequency element is a four-ridged square waveguide with one end short-circuited. A single low-frequency element can not only achieve dual-frequency dual-polarization and can be directly used as a dual-frequency dual-polarization antenna element, but more importantly, its overall structure is a regular metal structure. The structure is simple and neat, and can be directly designed and manufactured using mature 3D printing technology, greatly reducing costs. This structure can form a large-scale array, making up for the high cost and high loss of existing high-frequency (40-100GHz) microstrip reflective array antennas that must be processed using PCB technology.

The invention discloses an electrically pumped complex coupling distributed feedback laser resonant cavity and a laser. The laser resonant cavity comprises a gain material layer, the first doped coating buffer layer is arranged above the gain material layer, the first doped coating buffer layer is etched to form a waveguide ridge of which the middle is raised, dielectric isolation layers are arranged on the surface layers of etching remaining areas on the two sides of the waveguide ridge, and the top surfaces of the dielectric isolation layers are planes; the second doping coating buffer layer is arranged below the gain material layer; first Bragg arrays are arranged on the two side walls of the waveguide ridge or the surface layers of the residual etching areas on the two sides of the waveguide ridge; a second Bragg array is arranged on the dielectric isolation layer; a first electrode is arranged on the top surface of the waveguide ridge; and a second electrode is arranged on the bottom surface of the second doped coating buffer layer. According to the laser resonant cavity, when current is injected through the N-type metal electrode and the P-type metal electrode and the current density of the laser reaches a threshold value or above, the laser can achieve stable single-frequency laser output and has high resistance to external echoes.

The application discloses a broadband stepped film waveguide dual circular polarizer, and belongs to the technical field of microwave and millimeter wave. The device comprises a left-handed circular polarization feed waveguide, a right-handed circular polarization feed waveguide, two 90-degree waveguide bends, a radiation waveguide and a stepped film. The two feed waveguides are connected to the radiation waveguide through the 90-degree waveguide bends. The radiation waveguide is composed of a square waveguide and a cross-shaped waveguide, and is divided into an input section, a polarization separation / forming section and an output section which are connected in sequence. The input section is divided into left and right cavities by a waveguide wall. The polarization separation / forming section is provided with the stepped film. The left and right cavity sections are completely fused in the output section. The application adjusts waveguide dispersion, significantly expands the interval between the working mode and the high-order mode, and realizes the broadband working of the stepped film waveguide dual circular polarizer. At this time, the polarization separation / forming section can realize a 90-degree phase difference in a short distance, which is beneficial to reducing the transmission loss of the device and improving the compactness of the device.

The invention relates to a radar system for locating pipes buried in the ground and for detecting underground leaks of liquid, in particular water, with a square waveguide antenna for emitting orthogonally polarised signals of the same frequency. The invention essentially consists of a radar system (1) with an antenna (4) that can emit waves at a nominal frequency towards the ground in two polarisations that are distinct and orthogonal to one another, and that incorporates a measuring element (5) configured to measure the polarimetric ratio of the signals received in the two polarisations, in order to deduce from the imbalance between the two received signals the presence of a pipe buried in the ground, and, where appropriate, the presence of leaks of liquid, in particular water.