14 results about "Parabolic reflector" patented technology

This invention relates to the field of wireless communication technology, and provides a shaped antenna reflector and a reflector antenna, having a shaped reflector surface, including a parabolic reflector surface that is at least a portion of a semi-parabolic rotator and a swept reflector surface that is at least a portion of a swept surface; the generatrix of the semi-parabolic rotator is a parabolic segment whose vertex is on the parabola, and the semi-parabolic rotator is formed by rotating the generatrix by 180° about the axis of symmetry of the parabola; the edge of the parabolic reflector has a connecting edge that is located on the same parabola as the generatrix, and the swept surface is formed by sweeping the connecting edge in a direction away from the parabolic reflector surface, and the swept reflector surface is tangent to the parabolic reflector surface at the connecting edge; the shaped reflector surface is used to reflect spherical waves emitted from the feed on the concave side of the parabolic reflector surface, the reflected beam is a deformed cosecant square beam in a first plane direction and a narrow beam in a second plane direction, the first plane direction is consistent with the direction of the central symmetry plane of the semi-parabolic rotator, and the first plane direction and the second plane direction are perpendicular.

The present application relates to the field of laser equipment performance test, especially to a kind of laser equipment optical axis consistency and beam divergence angle combined test system and test method, test system includes off-axis parabolic reflector, photoelectric detector is arranged in its focal plane, movable target source is arranged in front of photoelectric detector, illumination device and data processor. By movable target source, different observation channel of laser equipment is provided with aiming target, and the shadow image and laser spot image of target source are collected in succession using the same photoelectric detector. Data processor calculates the deviation between different observation axes according to the shadow image, or the deviation between observation axis and laser beam optical axis;According to the laser spot image, the beam divergence angle and the optical axis stability are calculated. The present application integrates multiple test functions in the same optical path and hardware platform, realizes the efficient, compact combined test of optical axis consistency, beam divergence angle and other key indicators, significantly improves the test efficiency and saves space.

Acoustic locating and tracking device for flying objects, comprising two parabolic reflectors (1a, 1b), each with two microphones (2a-2d) for detecting acoustic signals, a mechanical swiveling device (3), a control unit (4) and an evaluation unit (5), characterized in that by comparing the four microphone signals both a horizontal and a vertical direction angle is calculated and a three-dimensional vector to the sound source is determined from this.

This invention discloses a design method for a Fresnel-type composite parabolic cylindrical reflector antenna, applicable to the field of microwave energy space transmission, and particularly suitable for use as a large-size antenna operating at a fixed point frequency. The antenna utilizes a parabolic segment between the origin and point B0, and point B... n With point D n The straight line segment between them, and point D n With point B n+1 The parabola segment between and point B N‑1 The straight line segment between point E and point D and point E and point D N The straight segments between them form a composite curve. Extending along the curve's normal with the composite curve as the generatrix, a Fresnel-type composite parabolic cylindrical reflector antenna is obtained. When it needs to be used in an offset-feed mode, a portion of the surface can be truncated according to actual needs. By replacing the ordinary parabolic cylinder with a Fresnel composite parabolic cylinder, the overall thickness of the parabolic cylindrical reflector antenna is reduced, enabling the segmentation, splicing, and folding of large-size parabolic reflector cylinders. This significantly reduces the processing difficulty and cost of large-size parabolic cylindrical reflector antennas, while also facilitating transportation, assembly, debugging, and adjustment.

Corrective meta surface lens is used to reduce the illumination and spill-over losses and improve the overall efficiency of a parabolic antenna when is horn-mounted, and / or top-mounted, and / or deposited directly on the frontal reflector surface of the parabolic antenna. For the horn-mounted model, a meta surface lens is placed in front of or in the aperture of the feed horn to reduce side lobe level, which results in lower parabolic antenna spill-over losses and overall efficiency improvement by more than 40% (1.5 dB). For the top-mounted model, the meta surface lens is mounted on top of (or above) the parabolic reflector, which results in reduction in illumination losses, and greater than 70% (2.5 dB) efficiency. The meta surface lens has a wideband response, is lightweight and has a lattice structure which makes it a great candidate for withstanding wind forces.

This invention belongs to the field of satellite antenna technology, specifically a satellite signal receiver; it includes a satellite antenna; the satellite antenna includes a parabolic reflector; an arc-shaped cylindrical cavity is provided on the back of the parabolic reflector; a rotating cylinder is rotatably mounted on the middle of the arc-shaped cylindrical cavity and the parabolic reflector; a first arc plate is fixed on the outer ring surface of the rotating cylinder; a sliding column slides inside the rotating cylinder; a rectangular groove is formed inside the sliding column; a second arc plate rotates within the rectangular groove via a torsion spring and a rotating shaft; a rectangular frame is fixed on the back of the arc-shaped cylindrical cavity; a triangular block is fixed at the bottom of the rectangular frame; a mounting bracket is provided below the triangular block; the side of the triangular block closest to the first electric push rod is rotated on the mounting bracket via a rotating rod; by setting the arc-shaped cylindrical cavity, this invention can avoid optical path difference shift and destructive interference of reflected signals caused by surface deformation, ensure the stability of the antenna main lobe gain, and reduce the risk of signal-to-noise ratio degradation and signal loss.

This invention relates to a high-gain dual-polarized parabolic antenna system and its performance preservation method. The system includes: a parabolic reflector; a feed source disposed at the focal or near-focal region of the parabolic reflector; the feed source includes a printed circuit board (PCB) on which metal oscillator elements are formed by etching; the metal oscillator elements include at least two sets of orthogonally arranged oscillators, forming radiation in two orthogonal polarization directions; each oscillator element integrates a low-frequency radiating section for a first frequency band and a high-frequency radiating section for a second frequency band, the first and second frequency bands corresponding to the 900MHz and 1800MHz frequency bands, respectively; the feed source radiates dual-polarized electromagnetic waves through the metal oscillator elements, and the electromagnetic waves are reflected by the parabolic reflector to form a high-gain directional beam. This invention achieves a compact structure and low-cost manufacturing while significantly improving the electrical performance of the antenna over a wide bandwidth, providing an efficient and flexible solution for modern wireless communication.

The utility model relates to optical lighting technical field, concretely is a light source to the inside oblique side light-emitting reflector, including reflector main part, light source subassembly, aluminium base plate and reflector coating, light source subassembly is set up with the inclination alpha = 30, cooperate parabolic reflector, curvature radius R = L / 2, make light concentration reflection to central axis direction, light efficiency utilization rate is from traditional scheme's 65% to 88% promotion, effective light intensity improves 2.3 times, reflector opening edge tangent angle beta = 70, will edge light reflection to predetermined area, avoid to non-illumination direction scattering, glare value is from 28 to fall below 15, aluminium base plate and reflector main part pass through bolt fixation, form heat conduction path, cooperate bottom heat dissipation hole, make light source junction temperature to reduce 12 DEG C, light attenuation rate is every year less than or equal to 3%, inclination angle alpha can be adjusted in 15 degree 45 degree range, adapts to different illumination distance, through bolt fixation ensure angle stability, assembly error is less than or equal to 0.5 degree.

The utility model provides a kind of solar drying equipment, comprising: drying chamber, the drying chamber includes at least one first air outlet, at least one first air inlet and at least one exhaust fan, and hot air of at least one first air inlet enters the direction of at least one first air outlet by exhaust fan blowing;Parabolic collector, parabolic collector includes at least one parabolic reflector and at least one solar heat collecting tube, the first end of solar heat collecting tube is connected with at least one first air inlet, and the second end of solar heat collecting tube is connected with at least one first air outlet.Compared with the natural space (drying area) required by original drying mode, the heat energy accumulated by light at different times can be reused by air circulation heating.Compared with other drying equipment schemes, the utility model is implemented at lower cost, effectively reducing the drying cost of most agricultural practitioners.

A phase-reconfigurable reflectarray or reconfigurable intelligent surface (RIS) is disclosed. The reflectarray or RIS includes a plurality of reflectors, wherein each reflector includes an antenna element in communication with a microwave circuit. The microwave circuit includes a fixed time delay element and an electronically controllable phase shifter. The time delay associated with each reflector is fixed, but the time delays vary across the reflectarray. In this way, the fixed time delay elements create a virtual surface, which may be any desired shape, such as a parabolic reflector, a spherical reflector, hyperbolic reflector, or a parabolic cylinder. Additionally, the reflectarray employs a beamforming algorithm to control the phase introduced by each phase shifter so as to maximize the desired signal and suppress interfering signals.

This invention discloses a synchronous measurement system for total temperature, static temperature, dynamic temperature, and flow velocity of a high-temperature, high-speed airflow. The components include a type B thermocouple, a temperature transmitter, two tunable diode lasers, a signal generator, an optical fiber coupler, a collimating mirror, a parabolic reflector, a photodetector, a data acquisition card, a high-temperature alloy mounting base, thermocouple branches, optical detection branches, and cage-type mounting accessories. The measurement system uses thermocouples and laser absorption spectroscopy to measure the total temperature and static temperature of the high-temperature, high-speed airflow, respectively. Then, based on the relationship between the total temperature, static temperature, dynamic temperature, and flow velocity of the high-temperature, high-speed airflow, the dynamic temperature and flow velocity of the airflow at the measured point in the flow field are determined. This invention achieves synchronous measurement of the total temperature, static temperature, dynamic temperature, and flow velocity of a high-temperature, high-speed airflow, and has advantages such as low cost, small size, portability, and fast data processing. It can be widely used in fields such as gas turbines and aero-engines.

An apparatus comprising a biconical antenna 202 for generating an omnidirectional beam pattern is presented. A reflector 210 reflects the omnidirectional beam pattern from the biconical antenna into a predetermined beamform. The reflector 204 comprises a ground plane 208 connected to the biconical antenna 202 and a parabolic reflector 210 extending from the ground plane at a predetermined angle. A curvature of the parabolic reflector 210 reflects the omnidirectional beam pattern into the predetermined beam form. The predetermined angle corrects for beam shift of the predetermined beam form caused by the ground plane 208.

Systems and methods herein provide for deployable reflectors. In one embodiment, a deployable antenna includes a reflector having a plurality of integrated hinges defining a crease pattern that permits the reflector to transition between a substantially flat stowed configuration and a deployed configuration having a predetermined three-dimensional curvature. The reflector may be formed from a composite laminate and may include a reflective layer suitable for radio-frequency or other electromagnetic applications. Deployment may be driven at least in part by strain energy stored in the reflector, with optional actuators, retaining mechanisms, and rate-limiting devices providing controlled release, deployment, and re-stowage. The antenna may be integrated with a satellite or other platform and may be repeatedly deployed and retracted to support dynamic mission requirements. Systems and methods are also disclosed for controlling deployment and retraction of the antenna, including a controller which coordinates actuator operation and communications during and after deployment.