16 results about "Coaxial antenna" patented technology

The invention provides a 915 MHz MPCVD device for 16-inch diamond wafer deposition, and relates to the technical field of microwave plasma chemical vapor deposition. The device comprises a shell, a cavity is formed in the shell, a microwave inlet is formed in the top of the shell, a coaxial antenna is installed in the cavity of the shell, an air inlet is formed in the coaxial antenna, an air outlet and a substrate are arranged at the bottom of the shell, and the air inlet and the air outlet are communicated with the cavity; and a plurality of microwave medium windows are arranged on the inner wall of the shell. The microwave dielectric windows are arranged, the length and the phase of a microwave transmission path are changed, the two microwave electric field areas are connected into a whole, the plasma is excited, and the formed plasma area is located on the substrate. According to the device, a continuous TM02 microwave electric field with the diameter of 16 inches is generated on a substrate through the design of the structure of the resonant cavity and the shape and position of a microwave medium, a large-size plasma area is excited, and 16-inch diamond wafer deposition is achieved.

The present invention belongs to the field of rock mass crack research experiments. Provided is a test system for real-time permeability enhancement based on microwaves. The test system comprises: a microwave generator, a straight waveguide, an omnidirectional-irradiation coaxial antenna mechanism and a permeability test mechanism, wherein an output end of the microwave generator is connected to the straight waveguide, and an output end of the straight waveguide is provided with the omnidirectional-irradiation coaxial antenna mechanism; each annular assembly comprises a ceramic inner ring and a metal outer ring; and a microwave irradiation opening is formed between two adjacent annular assemblies, such that microwaves irradiate outwards via the microwave irradiation opening. By means of the present invention, diffused microwaves are formed inside a specimen, and the microwaves are uniformly distributed in all directions inside the specimen via the microwave irradiation opening, thereby expanding the microwave action range; and during the process, flow rate changes are recorded in real time, so as to comprehensively reflect the permeability of the specimen, thereby simulating the real-time evolution characteristics of permeability during the in-situ microwave modification of a reservoir.

An ablation probe tip 100 having a shaft 102 with an insertion end 104. The shaft 102 includes a coaxial antenna 110. A center of ablation 124 is located within the shaft 102 near the insertion end 104. A heat transfer layer 130 surrounds the coaxial antenna 110. A thermal reservoir 134 at least partially surrounds the heat transfer layer 130. A method for using the ablation probe tip 100 includes predetermining an optimal temperature for the heat transfer layer 130, and the thermal reservoir 134 cooling the heat transfer layer 130 to no higher than the optimal temperature. The ablation probe tip 100 may be part of an ablation probe system 50 that includes an ablation source 60 that provides ablation means 62 to the ablation probe tip 100.

The invention discloses a full-band dual-polarization direction-finding antenna array, and belongs to the technical field of radio monitoring. The antenna array comprises a double-layer coaxial antenna array, an integrated host cavity and a signal processing link assembly. The double-layer coaxial antenna array is formed by coaxially arranging a low-frequency sub-array and a high-frequency sub-array, each low-frequency sub-array and each high-frequency sub-array comprise eight dual-polarization directional antenna elements, and each antenna element is integrated with a horizontal polarization dipole and a vertical polarization dipole and is provided with a special-shaped reflection cavity. The integrated host cavity is made of 6061 aluminum alloy, a signal processing link is arranged in the integrated host cavity, the overall height is smaller than or equal to 250 mm, and the overall weight is smaller than or equal to 15 kg. The signal processing link realizes 1.3 GHz-9 GHz full-band dual-polarization direction finding through low-noise amplification, frequency band / polarization switching, frequency conversion and a MUSIC algorithm, the direction finding error RMS is less than or equal to 2 degrees, and the coverage is 360 degrees in the horizontal direction and + / -35 degrees in the vertical direction. The high-frequency-band horizontal polarization direction finding device fills the blank of high-frequency-band horizontal polarization direction finding in China, and is suitable for a fixed station and a portable and movable direction finding station.

The application belongs to the electromagnetic field and microwave technology field, and particularly relates to a common-caliber antenna array with three-frequency and ultra-wideband electromagnetic self-compatibility characteristics. The three-frequency electromagnetic self-compatibility base station common-caliber antenna array comprises a double-frequency self-compatibility low-frequency antenna, a medium-frequency antenna array, a high-frequency antenna array and a three-frequency self-compatibility array reflection floor; the ultra-wideband electromagnetic self-compatibility common-caliber base station antenna array comprises a wideband self-compatibility low-frequency antenna, an ultra-wideband antenna array and a wideband self-compatibility array reflection floor. The medium-frequency antenna array is composed of M1xM1 medium-frequency antenna units with the same structure. The high-frequency antenna array (3) is composed of M2xM2 high-frequency antennas (6) with the same structure. The ultra-wideband antenna array is composed of NxN ultra-wideband antenna units with the same structure. In the application, the working frequency band of the three-frequency electromagnetic self-compatibility common-caliber base station antenna array is 0.79-1.0 GHz, 1.7-2.7 GHz and 3.1-4.1 GHz; the working frequency band of the ultra-wideband electromagnetic self-compatibility common-caliber base station antenna array is 0.69-0.96 GHz and 1.6-3.2 GHz.

The utility model belongs to the technical field of radar antenna equipment, and relates to an antenna pitch angle adjusting device which comprises a pitch driven shaft, a primary adjusting assembly coaxially connected with the pitch driven shaft, a secondary adjusting assembly coaxially connected with the primary adjusting assembly and a spring. The pitching driven shaft is coaxially and fixedly connected with the antenna; the first-stage adjusting assembly is coaxially and fixedly connected with the pitching driven shaft; the second-stage adjusting assembly is coaxially and movably connected with the first-stage adjusting assembly through a spring, and the second-stage adjusting assembly and the first-stage adjusting assembly are meshed or separated through deformation of the spring. According to the utility model, the pitching driven shaft, the primary adjusting assembly, the secondary adjusting assembly and the antenna are coaxially arranged, so that the coaxiality among the components is ensured, friction and gaps caused by non-coaxiality among the components are reduced, the stability of the adjustment of the pitching angle of the antenna is improved, and meanwhile, through the mutual cooperation of the primary adjusting assembly and the secondary adjusting assembly, the adjustment precision of the pitching angle of the antenna is improved. Precise adjustment of the pitching angle of the antenna is realized.

This invention belongs to the field of rock mass crack research experiments and provides a microwave real-time permeability enhancement test system, including: a microwave generator, a straight waveguide, a full-area illumination coaxial antenna mechanism, and a permeability detection mechanism; the output end of the microwave generator is connected to the straight waveguide, and the full-area illumination coaxial antenna mechanism is installed at the output end of the straight waveguide; the annular assembly includes a ceramic inner ring and a metal outer ring; a microwave illumination port is formed between two adjacent annular assemblies for microwave irradiation outward from within the microwave illumination port; this invention improves the microwave action range by forming diffused microwaves inside the sample and uniformly dispersing the microwaves to various directions inside the sample through the microwave illumination port, and records the flow rate changes in real time during this process to comprehensively reflect the permeability of the sample, simulating the real-time evolution characteristics of permeability during in-situ reservoir microwave stimulation.

The invention discloses a high-power double-source double-frequency microwave heating device, and relates to the technical field of microwave heating equipment. Comprising a first microwave generation source and a second microwave generation source, the first microwave generation source is connected with a first coaxial antenna through a waveguide tube, the second microwave generation source is connected with a second coaxial antenna through a waveguide tube, and the first coaxial antenna and the second coaxial antenna are vertically arranged on a top cover of the microwave reaction cavity; a material conveying device is arranged below the microwave reaction cavity top cover, a microwave reaction cavity is movably arranged above the material conveying device, a lifting device is arranged at the end part of the material conveying device, and after the microwave reaction cavity moves to the lifting device, the lifting device rises to enable the microwave reaction cavity to be in sealed contact with the microwave reaction cavity top cover. High-power output is achieved through double-source double-frequency microwaves, uniformity and high efficiency of the heating process are guaranteed, energy consumption is remarkably reduced, energy conservation and environmental protection are achieved, and the requirements for high-quality treatment and efficient heating of different materials and technologies are met.

The invention provides a low-power microwave cavity plasma reactor. The basic structure of the reactor comprises a total cavity, a quartz partition plate, a deposition table and a coaxial antenna. The total cavity is a cylindrical metal cavity, the quartz partition plate is horizontally placed in the total cavity and divides the total cavity into an upper coupling cavity and a lower ion chamber, the deposition table is located in the ion chamber, the coaxial antenna is connected with the coupling cavity, the microwave coupling mode is coaxial antenna coupling, and the microwave mode is TEM. According to the design method, the total cavity diameter Wc is 2 lambda, the height Hc is 3 lambda, the quartz bottom position Hg is 1.5 lambda, the total height of the deposition table is lambda, the total length H2 of the coaxial antenna is lambda, the length of the coaxial antenna extending into the coupling cavity is 0.5 lambda, and other sizes of the deposition table and the coaxial antenna are limited within a certain proportion range of the microwave wavelength lambda. The invention is suitable for 915MHz and 2.45 GHz microwaves, has the characteristics that a larger plasma discharge diameter can be obtained by low-power microwave input, meanwhile, the structure is extremely simple, the cost is low, the processing difficulty is low, and a certain application prospect is achieved.

The invention provides a cylindrical resonant MPCVD device capable of improving plasma distribution uniformity, and relates to the technical field of semiconductor equipment. Comprising a waveguide device and a resonant reaction cavity, and a carrying table used for carrying a substrate is arranged in the resonant reaction cavity; the waveguide device comprises a rectangular conduction cavity and an annular coaxial antenna perpendicular to the rectangular conduction cavity. A coaxial antenna resonant cylindrical cavity connected with the lower part of the rectangular conduction cavity and a cylindrical resonant cavity connected with the coaxial antenna resonant cylindrical cavity and the resonant reaction cavity are arranged along the central axis direction of the annular coaxial antenna; the annular part of the annular coaxial antenna extends into the cylindrical resonant cavity; wherein the cylindrical resonant cavity is internally provided with a resonant ring, and the resonant ring is located below the annular part of the annular coaxial antenna so as to change the resonance direction and form an elliptical shockwave on the surface of the carrying platform. According to the scheme, the distribution uniformity of plasmas is improved.

The utility model discloses an eight-row coaxial antenna for the communication field, and relates to the technical field of communication. The eight-row coaxial antenna used in the communication field comprises an eight-row coaxial antenna body and a mounting head connected with the eight-row coaxial antenna body, and the eight-row coaxial antenna body is fixedly erected on a supporting device such as a telegraph pole through the mounting head. According to the device, a displacement mechanism composed of an arc-shaped seat, a guide block, a tooth block, an arc-shaped tooth plate and a bidirectional threaded rod is arranged between an installation head and eight rows of coaxial antenna bodies, and a steering assembly composed of a supporting screw rod and a supporting column is arranged. The eight rows of coaxial antenna bodies can be controlled to carry out transverse and vertical arrangement position regulation and control relative to the mounting head, external objects are prevented from being in contact with the eight rows of coaxial antenna bodies, it is ensured that the communication transmission angle of the eight rows of coaxial antenna bodies meets the transmission requirement, and the eight rows of coaxial antenna bodies carry out stable signal transmission.

The application discloses a dual-polarization and circular polarization dual-frequency coaxial antenna based on a decoupling surface and relates to the technical field of antennas.The antenna comprises a first dielectric plate, a decoupling surface, a low-frequency dipole antenna, a low-frequency dipole antenna Y-shaped feed line, a low-frequency feed coaxial line, a second dielectric plate, a high-frequency patch antenna, a high-frequency patch antenna hook-shaped feed line, a high-frequency feed coaxial line, a third dielectric plate, a fourth dielectric plate, a fifth dielectric plate, a one-to-two linear polarization differential feed power divider and a one-to-four circular polarization feed power divider.The combination of the decoupling surface and the low-frequency antenna makes the radiation wave of the high-frequency antenna penetrate through, solves the problem of the low-frequency antenna shielding the high-frequency antenna, restores the gain of the high-frequency antenna and repairs the distortion of the high-frequency antenna directional diagram without affecting the normal operation of the low-frequency antenna and without increasing the overall profile of the antenna.The dual-polarization decoupling and the circular polarization decoupling can be realized.The port isolation degree of the high-frequency and the low-frequency is less than-25 dB between the two working frequency bands, and good decoupling effect is achieved.

The application discloses a full-band dual-polarized direction-finding antenna array and belongs to the technical field of radio monitoring. The antenna array comprises a double-layer coaxial antenna array, an integrated main cavity and a signal processing link component. The double-layer coaxial antenna array is coaxially arranged by a low-frequency subarray and a high-frequency subarray, each of which contains 8 dual-polarized directional antenna elements. Each antenna element integrates horizontal and vertical polarization dipoles and is provided with a special-shaped reflection cavity. The integrated main cavity is made of 6061 aluminum alloy and is internally provided with a signal processing link. The overall height is less than or equal to 250 mm, and the overall weight is less than or equal to 15 kg. The signal processing link realizes 1.3GHz-9GHz full-band dual-polarized direction finding through low-noise amplification, frequency band / polarization switching, frequency conversion and MUSIC algorithm. The direction finding error RMS is less than or equal to 2°, and the horizontal coverage is 360° and the vertical coverage is ±35°. The application fills the domestic high-frequency horizontal polarization direction finding blank and is suitable for fixed stations, portable and movable direction finding stations.

A multi-use antenna mount that can be used in a variety of different configurations for holding and mounting one or more antennas in different orientations may include a cylindrically (or prismatic) shaped, hollow main body and four different attachment points on multiple surfaces of the main body. In some embodiments, a first attachment point is a coaxial antenna cable connector. A second attachment point is a top, internally-threaded, coupler nut that can accept externally-threaded antenna elements. A third attachment point is a bottom, externally-threaded stud. A fourth attachment point is a recessed, internally-threaded hole disposed through a recessed flat surface on a side wall of the antenna mount's main body. All electrical connections are made inside of the hollow body of the antenna mount. A plurality of small radial holes may be used to mechanically attach and electrically connect a plurality of radial ground wires.

The application provides a large-array-element-spacing and low-frequency four-in-one feeding co-boresight antenna and a design method. Co-boresight dual-frequency units are arranged uniformly in 4*4 to form a basic subarray, and the low-frequency unit is fed by using a four-in-one feeding mode. The initial array surface is provided with sufficient subarray spacing to form an M*N size whole array, the offset of each subarray in the x and y directions is changed by using a global optimization algorithm, and the array surface grating lobes under the high-frequency and low-frequency scanning conditions are optimized. The application designs a low-cost co-boresight array surface by using the large-array-element-spacing and low-frequency four-in-one feeding technology, and the non-periodic arrangement of the subarray level is optimized by using an intelligent algorithm, and the high-gain unit is combined to reduce the far-field energy under the low-frequency four-in-one feeding and high-frequency conditions, so that the grating lobe suppression of the large-array-element-spacing co-boresight working antenna array surface is realized. The application has the advantages of not being limited to the array surface form in the array surface design and strong applicability.

The present application provides a kind of 915 MHz MPCVD device for 16 inch diamond wafer deposition, it is related to microwave plasma chemical vapor deposition technical field.The device includes shell, cavity is equipped in shell, microwave entrance is equipped in the top of shell, coaxial antenna is installed in the cavity of shell, gas inlet is equipped on coaxial antenna, gas outlet and substrate are equipped in the bottom of shell, gas inlet, gas outlet communicate cavity;Multiple microwave dielectric windows are arranged on the inner wall of shell.The present application is changed by being provided with multiple microwave dielectric windows, microwave transmission path length and phase, makes two microwave electric field areas be connected as a whole, and excites plasma, and the plasma region formed is located on substrate.The device generates continuous diameter 16 inch TM02 microwave electric field on substrate by the design of resonant cavity structure, microwave dielectric shape and position, excites large size plasma region, realizes 16 inch diamond wafer deposition.