13 results about "Square waveguide" patented technology

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.

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.

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.

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.

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.