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380 results about "Antenna aperture" patented technology

In electromagnetics and antenna theory, antenna aperture, effective area, or receiving cross section, is a measure of how effective an antenna is at receiving the power of electromagnetic radiation (such as radio waves). The aperture is defined as the area, oriented perpendicular to the direction of an incoming electromagnetic wave, which would intercept the same amount of power from that wave as is produced by the antenna receiving it.

Microwave antenna and outer cover thereof

ActiveCN101958461AImproved radiation F/B performanceHigh gainRadiating element housingsPhase retardationMicrowave
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.
Owner:COMBA TELECOM SYST (GUANGZHOU) LTD

Impedance matching for an aperture antenna

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.
Owner:KYMETA

Elastic-hinge-driven double-layer annular truss antenna mechanism

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.
Owner:HARBIN INST OF TECH

Broadband access system via drone/uav platforms

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.
Owner:UBIQOMM

Multibeam Antenna System

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.
Owner:APPLE INC

Leaky wave microstrip antenna with a prescribable pattern

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.
Owner:ANRITSU CORP

High power microwave radial line slit array antenna

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.
Owner:NAT UNIV OF DEFENSE TECH
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