377 results about "Antenna aperture" patented technology

A radar system having orthogonal antenna apertures is disclosed. The invention further relates to an antenna system wherein the orthogonal apertures comprise at least one transmit aperture and at least one receive aperture. The cross-product of the transmit and receive apertures provides a narrow spot beam and resulting high resolution image. An embodiment of the invention discloses orthogonal linear arrays, comprising at least one electronically scanned transmit linear array and at least one electronically scanned receive linear array. The design of this orthogonal linear array system produces comparable performance, clutter and sidelobe structure at a fraction of the cost of conventional 2D filled array antenna systems.

The invention discloses a microwave antenna and an outer cover thereof. The outer cover is a rotational symmetric element which comprises a plurality of homocentrically arranged parts as below: a compensation part arranged at the middle of the outer cover and used for compensating the phase delay of the electric field distribution at the middle of an antenna aperture surface caused by the shielding of a feed source, a main reflection part arranged at the periphery of the compensation part and used for reflecting the electromagnetic wave emitted from the microwave antenna feed source to a specific direction deviating from the feed source, and an assistant reflection part arranged at the periphery of the main reflection part and used for carrying out reflex bunching on the edge diffraction electromagnetic wave of the microwave antenna. All the parts of the outer cover are especially designed and shaped, therefore the microwave antenna has the characteristics of excellent electrical properties, stable structure, low cost and the like.

An antenna apparatus and method for use of the same are disclosed herein. In one embodiment, the antenna comprises a single physical antenna aperture having at least two spatially interleaved antenna arrays of antenna elements, the antenna arrays being operable independently and simultaneously at distinct frequency bands.

A shared beamformer flexibly allocates beams among phased array antenna apertures of a satellite (or other type of platform). By sharing the beamformer among the apertures, if one aperture is not providing useful coverage (due to orientation, traffic volume, signal frequency, signal polarization, etc.), the beams may be reallocated to one or more other apertures that are providing useful coverage. To share the beamformer among the phased array antenna apertures, a selector network (e.g., one or more switches) is used to select which particular apertures are to send or receive signals.

A method and apparatus for impedance matching for an antenna aperture are described. In one embodiment, the antenna comprises an antenna aperture having at least one array of antenna elements operable to radiate radio frequency (RF) energy and an integrated composite stack structure coupled to the antenna aperture. The integrated composite stack structure includes a wide angle impedance matching network to provide impedance matching between the antenna aperture and free space and also puts dipole loading on antenna elements.

A method and apparatus for aperture segmentation are disclosed. In one embodiment, the antenna comprises an antenna feed to input a cylindrical feed wave and a physical antenna aperture coupled to the antenna feed and comprising a plurality of segments having antenna elements that form a plurality of closed concentric rings of antenna elements when combined, where the plurality of concentric rings are concentric with respect to the antenna feed.

The invention discloses an elastic-hinge-driven double-layer annular truss antenna mechanism, relates to an unfoldable antenna mechanism and aims to solve the problems that an existing monocyclic annular truss mechanism is decreased in rigidity along with increase of the antenna aperture and thereby cannot achieve the use stiffness requirements, and an existing annular truss antenna is complex in driving mechanism, large in mechanism weight and quite low in unfolding reliability. The elastic-hinge-driven double-layer annular truss antenna mechanism comprises inner-ring annular truss components, outer-ring annular truss components, a plurality of inner-and-outer-ring connection truss components and a plurality of inhaul cable components, each of the inner-ring annular truss components and the outer-ring annular truss components comprises a plurality of elastic-hinge-driven foldable and unfoldable units and a plurality of elastic-hinge-driven transition foldable and unfoldable components, each two adjacent elastic-hinge-driven foldable and unfoldable units are connected through the corresponding elastic-hinge-driven transition foldable and unfoldable component, and four corresponding vertex angles between each inner-ring annular truss component and the corresponding outer-ring annular truss component are supported and are connected rotatably by one inner-and-outer-ring connection truss component. The elastic-hinge-driven double-layer annular truss antenna mechanism is used for satellites, space stations and space probes.

Monitoring and compensating for environmental and other conditions affecting antenna elements of an antenna is described. The conditions may affect radio frequency (RF) liquid crystal of the antenna elements. In one embodiment, the antenna comprises a physical antenna aperture having an array of surface scattering antenna elements that are controlled and operable together to form a beam for the frequency band for use in holographic beam steering and a compensation controller to perform compensation on the antenna elements based on monitored antenna conditions.

The present disclosure describes the system and methods for providing broadband internet access to homes and enterprises using a network of aerial platforms such as drones/UAVs/balloons. Drones form and point beams toward ground terminals in different areas in a space division multiple access scheme. Ground terminals search for the drone from which they receive the strongest signals. Drone and ground terminals comprise of methods and systems to calibrate receive and transmit antenna elements. Drone radio sub-system keeps track of the drone's position and orientation changes and adjust drone's antenna beam accordingly to point to the same location on the ground as the drone moves. Depending on the changes in drone's position and orientation, the drone radio subsystem may switch the antenna aperture and/or the antenna fixture that is used to form a beam toward a specific ground terminal. Drones communicate with the terminals using a space and time division multiple access scheme.

Embodiments of the invention relate to beamforming antennas such as can be used in space division multiplexing systems. Space division multiplexing can be used to increase data capacity in wireless networks by enabling different base stations to transmit signals within the same frequency band. Each antenna beam can potentially be used to establish a communication link within an area of wireless coverage, and other communication links established on other antenna beams then represent interference to that user. In order to reduce interference, narrow beamwidths are desirable. These are typically achieved by increasing the aperture of the antenna in the azimuth plane, and in arrangements that require finely divided angular sectors, a greater number of antennas will be required to give three hundred and sixty degree coverage. As a result, there is potentially a large increase in the total surface area of antennas which is undesirable, as it leads to increased wind loading of an antenna tower. Embodiments of the invention provide an arrangement in which data are transmitted from a first transmitter to a first receiver using a first antenna beam, and data are transmitted from a second transmitter to a second receiver using a second antenna beam. The first antenna beam is formed by splitting the signal from the first transmitter into two parts with a first phase relationship between the parts, each part being connected to an antenna. A second antenna beam is formed by splitting the signal from the second transmitter into two parts with a second phase relationship between the parts, each part being connected to one of the two antennas. An advantage of embodiments of the invention is that data can be transmitted from different transmitters at the same frequency without interference, while presenting a smaller antenna aperture than is required with conventional systems.

A system and method for prescribing an amplitude distribution to a leaky-wave microstrip antenna having an array of radiating cells. The leaky-wave microstrip antenna includes a grounded element, a dielectric member coupled to the grounded element and a top conducting strip coupled to the dielectric member, the conducting strip including a first and second non-radiating conducting strip and a plurality of radiating cells. This distribution requires that the microstrip antenna possess a variable leakage-constant profile along its length, and is chosen so as to yield an H-plane power-gain pattern having low sidelobes. The leakage-constant profile is achieved by configuring the width and inter-cell spacing of the antenna radiating cells and keeping the phase constant fixed. The length or loading of the radiating cells may also be manipulated to achieve the desired leakage constant profile. This results in the desired distribution along the antenna's aperture and yields a power-gain pattern with low sidelobes. The antenna is excited by two equal-amplitude and 180° out-of-phase signals. These signals are applied to the feed end of the microstrip at two feeding ports. The microstrip antenna length is chosen such that more than 97% of the input power is radiated by the traveling electromagnetic, wave, while the remaining power is absorbed by the resistively terminated antenna end.

The invention relates to a high power microwave radial line slit array antenna which comprises a coaxial input waveguide, a radial line leaky wave waveguide and an antenna housing, wherein an output port of the coaxial input waveguide is connected with an input port of the radial line leaky wave waveguide, and an output port of the radial line leaky wave waveguide is sealed through the antenna housing. Microwaves are inputted through a coaxial over-mode waveguide in a transverse electronic and magnetic (TEM) mode, folding conversion is carried out through a double layer radial line waveguide, and microwave radial inner feedback is achieved on a waveguide upper layer. Slit unit arrays arranged on an antenna aperture cut a radial electric field, distant field same-phase superimposed circular polarization radian is achieved, the whole axial dimension is small, and the structure is compact. Due to action of a radial line slow wave structure, the wavelength of the radial line waveguide is reduced, and generation of slit array grating lobes is restrained. Due to the fact that a high order reflection mode excited by a wide slit array is restrained through a reflection offset spiral groove in a lower layer waveguide, the whole antenna has high radiant efficiency. Due to the improvement on the slit unit structure and vacuum sealing of the antenna housing, the whole radiating system has high power capacity, and application requirements in the high power microwave field can be met.

This invention discloses a realization device and a method for base station antenna stationary-wave ratio alarm, in which, a digital signal process module samples the inverse power detecting signals, processes the sampled digitalized information and outputs the stationary-ratio alarm signals by calibrating the antenna aperture stationary-ratio and detecting the inverse power, which is only necessary to test the reverse signal power to realize the antenna stationary-wave ratio alarm.

The invention discloses a method for obtaining the user terminal transceiving channel transmission time. The physical layer of the user terminal is set to support loop back testing. The switch is set on the emission state by the user terminal. The transmitter channel and receiving channel are in working state at the same time. The transmitter channel of the user terminal sends IQ signal according to the timing reference of the physic layer and records the time which is relative to the time when the timing reference sends the IQ signal. The IQ signal, which is released from the switch, is received by the receiving channel and processed with a physical layer synchronous algorithm to obtain the time of the IQ signal which is relative to the timing reference. The user terminal transceiving channel transmission time is obtained by comparing the time when the IQ signal is sent with the time when the IQ signal is received. The invention obtains the accurate transceiving channel transmission time via the loop back testing on the user terminal, furthermore the time initial lead which is obtained by the user terminal by using the antenna aperture as the reference can be corrected via the transmission time.

An antenna structure including at least two stacked antenna apertures, a first antenna aperture with first antenna elements and at least a second antenna aperture with second antenna elements. The antenna structure is arranged for operation in at least a high and a low frequency band. The first antenna elements are arranged for operation in the high frequency band and the second antenna elements for operation in the low frequency band. The first antenna elements are arranged to have a polarization substantially perpendicular to the polarization of the second antenna elements. The second antenna elements are arranged in at least one group and each of the group includes a number of second antenna elements coupled in series and arranged to have a common feeding point on a straight feeding structure. One feeding structure is located adjacent to each group of second antenna elements. The direction of the feeding structure is substantially perpendicular to the polarization of the first antenna elements. A corresponding method and a radar system including the antenna structure.