38 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.

Provided is a fixture applied to sticking a strain gauge on a Hopkinson square bar and a use method of the fixture. The invention is specially designed for a square waveguide bar, and the fixture further ensures consistency of the same group of strain gauges along a cross-section position of the bar. The fixture has important practical value in application in a dynamic true triaxial electromagnetic Hopkinson bar test, especially in a high-end material testing field requiring high-precision and high-reliability test data.

Structure for an edge coupler (10), the structure comprising: a first dielectric layer (24) having an edge (25); a first waveguide core region (18) on the first dielectric layer (24), the first waveguide core region (18) having an end face (28) and the first waveguide core region (18) being conical in the longitudinal direction towards the end face (28); a plurality of segments (12) on the first dielectric layer (24), the plurality of segments (12) being arranged between the first waveguide core region (18) and the edge (25) of the first dielectric layer (24); a waveguide core (32) having a first portion (34) disposed over the first waveguide core region (18) in an overlapping arrangement, the waveguide core (32) having an end face (38) and the first portion (34) being conical in the longitudinal direction toward the end face (38); a back-end-of-line stack (42) over the waveguide core (32); and a second dielectric layer (44) having an interface (43) with the back-end-of-line stack (42), the second dielectric layer (44) extending from the interface (43) to the edge (25) of the first dielectric layer (24), wherein the end surface (38) of the waveguide core (32) extends over the same distance as the interface (43).

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 discloses a light and thin waveguide slot antenna, which comprises a waveguide cavity and a feeding printed board, and the feeding printed board is located below the waveguide cavity; a waveguide wall is arranged in the waveguide cavity, and the waveguide wall divides the waveguide cavity of the whole waveguide cavity into a first waveguide cavity and a second waveguide cavity; the first waveguide cavity is a rectangular waveguide cavity, and the second waveguide cavity is a ridge waveguide cavity. The waveguide slot antenna only adopts one layer of waveguide cavity, and the feeding network integrates an electric bridge, a power division network and a coupling feeding strip line, so that the waveguide slot antenna has the advantages of light weight, light weight, simple antenna processing and assembly.

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 present invention relates to the field of wireless communication technologies and provides a broadband orthomode coupler. The broadband orthomode coupler provided by the present invention includes side-arm waveguides, straight-arm waveguides, T-shaped transmission waveguide feed waveguides, T-shaped transmission waveguides, and T-shaped waveguide to rectangular waveguide transition waveguides; the straight-arm waveguides, T-shaped transmission waveguides, T-shaped transmission waveguide feed waveguides, and T-shaped waveguide to rectangular waveguide transition waveguides are connected and communicated to form a horizontal polarization wave channel for transmitting horizontal polarization waves; the side-arm waveguides, T-shaped transmission waveguides, T-shaped transmission waveguide feed waveguides, and T-shaped waveguide to rectangular waveguide transition waveguides are connected and communicated to form a vertical polarization wave channel for transmitting vertical polarization waves. This broadband orthomode coupler can extend the gradual change length, enabling the high-order mode suppression to achieve broadband characteristics, solving the disadvantage of the complex structure of the current broadband orthomode coupler, and having a simple structure, small volume, and being easy to process.

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 discloses a G-band four-ridge dual-polarized horn antenna which comprises a four-ridge horn section, a four-ridge waveguide transition section and a partition polarizer, the four-ridge horn section is used for generating two orthogonal fields, and the four-ridge waveguide transition section is used for performing impedance matching on the four-ridge horn section and the partition polarizer. The partition plate polarizer is used for performing dual polarization on G-band electromagnetic waves transmitted by a signal source and then transmitting the G-band electromagnetic waves to the horn antenna section, in the partition plate polarizer, a stepped metal partition plate is arranged in a square waveguide to divide the square waveguide into two rectangular waveguides, and an inner side impedance converter and an outer side impedance converter perform impedance matching on a feeder line and the square waveguide. According to the invention, the partition plate polarizer is adopted to realize equal-amplitude 90-degree phase difference feed and conversion between linear polarization and circular polarization at the same time under the condition of a single port.

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.

The application discloses a few-mode optical fiber and a silicon-based multi-mode chip coupling structure and a preparation method, and belongs to the technical field of optical elements, systems or instruments. The coupling structure comprises a silicon-based multi-mode chip, a few-mode optical fiber, a few-mode photonic wire bonding waveguide and a fiber base. The silicon-based multi-mode chip comprises a silicon substrate, a buried oxygen layer, a silicon-based waveguide, an upper cladding layer and an inverted cascade tapered waveguide with a subwavelength grating and an alignment mark. The few-mode optical fiber comprises a core and a cladding. The few-mode photonic wire bonding waveguide comprises a square waveguide above the inverted cascade tapered waveguide with a subwavelength grating, a transition waveguide and a curved waveguide. The fiber base is a stepped base used for fixing the positions of the chip and the optical fiber. The silicon-based multi-mode chip is connected with the few-mode optical fiber through the few-mode coupling structure composed of the upper few-mode photonic wire bonding waveguide and the lower inverted cascade tapered waveguide with a subwavelength grating, the mode hybridization effect is enhanced, and the silicon-based rectangular vector mode is matched with the circular linear polarization mode of the few-mode optical fiber.

The present application relates to a Ku / Ka dual-band splitter and a design method, and relates to the field of electromagnetic field technology. The method includes: selecting the large opening size of the square waveguide of the dual-band splitter and the small opening size of the square waveguide according to the frequency of the transmission signal and the cutoff waveguide size of the square waveguide; obtaining the overall size design of the splitter body according to the large opening size, the small opening size, and the coupling hole size; after cascading the fold filter at the sidewall coupling port, adjusting the parameters of the fold filter with the multi-port S parameters of the dual-band splitter as the optimization target, obtaining the filter size design of the sidewall filter; combining the overall size design and the filter size design to obtain the overall design of the dual-band splitter. The present application has the effect of ensuring the performance of the splitter and improving the design efficiency.

The invention relates to a dual-polarized antenna isolation feed structure and a high-isolation dual-polarized horn antenna, and belongs to the technical field of microwaves. The dual-polarized antenna isolation feed structure comprises a waveguide seat, a first feed waveguide, a second feed waveguide, a first feed socket with a first socket inner core and a second feed socket with a second socket inner core, the first feed waveguide is a square waveguide, and the second feed waveguide is a rectangular waveguide; the first feed waveguide and the second feed waveguide are arranged in the waveguide seat; the first feed socket is connected to a first position of the waveguide seat; the second feed socket is connected to a second position of the waveguide seat; the distance between projection points of the first position and the second position on the axis in the length direction of the waveguide base is L1, and L1 = (1 / 3-2 / 3) * lambda 1; lambda 1 is the nominal center frequency wavelength of the antenna. According to the dual-polarized antenna isolation feed structure provided by the embodiment of the invention, the isolation degree of the port can be improved on the premise that the increase of manufacturing difficulty and cost is not limited.

The invention relates to a distributed refrigeration waveguide polarization coupling device. The device comprises a window flange assembly, a window circular waveguide, a circular waveguide, a circular-square waveguide transition conversion piece, a phase shifter and an orthogonal coupler which are arranged in sequence, the window circular waveguide adopts a sectional waveguide and comprises a window circular waveguide upper half part and a window circular waveguide lower half part which are arranged at an interval; a window heat insulation support is arranged on the outer side of the window circular waveguide; the outer surface of the phase shifter and the outer surface of the orthogonal coupler are provided with a heat insulation supporting structure. According to the distributed refrigeration waveguide polarization coupling device, the integrated design of the sectional waveguide, the distributed heat insulation supporting module and the refrigeration module is adopted, the distributed refrigeration waveguide polarization coupling device can work below a liquid nitrogen temperature zone, thermal noise can be effectively reduced, and signal transmission loss can be reduced. The waveguide polarization coupling device is integrated with a heat insulation supporting structure, is small in size, is easy to assemble and debug, is stable in performance at low temperature, and can well meet the requirements of current related systems.

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 invention discloses a dual-circularly-polarized rectangular feed source with a fixed phase-shifting section, which belongs to the technical field of antennas and comprises an orthogonal mode coupler, a circular waveguide dielectric circular polarizer, a square waveguide fixed phase-shifting section and a rectangular horn. The orthogonal mode coupler is connected with one end of the circular waveguide dielectric circular polarizer, the other end of the circular waveguide dielectric circular polarizer is connected with one end of the square waveguide fixed phase shift section, and the other end of the square waveguide fixed phase shift section is connected with the rectangular horn; by adjusting the rotation angle of the dielectric circular polarizer, switching of linear polarization and circular polarization signals can be realized. The dual-circular-polarization feed source realizes a dual-circular-polarization function, realizes differential free design of beam widths of a horizontal plane and a vertical plane, and solves the problem of free design of the beam widths of two planes of the dual-circular-polarization feed source; the problem of low aperture irradiation efficiency of the traditional dual-circularly polarized shaped reflecting surface feed source is solved; the structure is reliable and high in machinability, and the whole structure is easy to achieve.

The waveguide polarizer comprises a square waveguide and the index curve diaphragm, the longitudinal section of the square waveguide is square, and the index curve diaphragm is arranged in the middle of the square waveguide. The index curve diaphragm is divided into a rectangular separation part and a curve part of which the height is gradually reduced in the form of an index curve along the length direction of the square waveguide; the height of the separation part is matched with that of an inner cavity of the square waveguide, and the inner cavity at the input side of the square waveguide is divided into two same rectangular waveguide cavities; according to the waveguide polarizer, an index curve diaphragm is arranged in a square waveguide, an electromagnetic signal input by a rectangular waveguide cavity end is differentiated into two paths of electromagnetic signals which are mutually orthogonal and have a phase difference of 90 degrees, and the two paths of electromagnetic signals are output from the square waveguide cavity end, so that a linear polarization signal or a circular polarization signal is formed.

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.