35 results about "Lens antennas" patented technology

Disclosed is a lens antenna comprising a dielectric lens consisting of a collimating part and an extension part, and an antenna element. The extension part of the lens comprises a substantially flat surface crossed by the axis of the collimating part, and the antenna element is rigidly fixed on the surface. The antenna element is formed by a hollow waveguide and comprises a dielectric insert with one end thereof adjacent to said surface; the size of the radiating opening of the waveguide is determined by the predefined width of the main beam and by side lobe levels of the radiation pattern of the lens antenna. The technical result of the invention is an increase in realized gain value due to the use of a waveguide antenna element with a dielectric insert, which provides impedance matching in a wide frequency bandwidth. The present invention can be used in radio-relay point-to-point communication systems, e.g. for forming backhaul networks of cellular mobile communication, in car radars and other radars, in microwave RF tags, in local and personal communication systems, in satellite and intersatellite communication systems, etc.

The invention discloses a millimeter-wave 360-DEG omnidirectional-scan dielectric cylinder lens antenna comprising three dielectric cylinder lenses, three feed source antenna arrays with scan ranges of 120 DEG and four round metal discs. One of the three dielectric cylinder lenses is respectively coaxially arranged among the four round metal discs, one of the three feed source antenna arrays is respectively arranged between the edges of two adjacent round metal discs, the difference between two of the three feed source antenna arrays on a horizontal projection surface is 120 DEG, and a phase central plane of each feed source antenna array is superposed with a focal plane of each dielectric cylinder lens. The invention realizes 360-DEG omnidirectional scan in the horizontal direction; the three dielectric cylinder lens antennas are partitioned by parallel round metal disc-shaped plates, and the scan of each homogeneous dielectric cylinder lens is not interfered by the other two lenses,thus the scanning beam of each layer of cylinder lens antenna is totally consistent; and the millimeter-wave 360-DEG omnidirectional-scan dielectric cylinder lens antenna can be conveniently connected with a printed integrated circuit. The millimeter-wave 360-DEG omnidirectional-scan dielectric cylinder lens antenna is applied to the fields of space flight communication, satellite communication, electronic countermeasure and the like.

The present invention discloses a system and method for free-space method dielectric constant measurement through addition of a polarization grid, belonging to the electromagnetic field and microwave technology field. On the basis of the current free-space method measurement system, a polarization grid mesh is added next to one side of a sample to be measured, a changing curve of reflection parameters and transmission parameters of the network with the angle of the polarization grid mesh is measured to distinguish the electromagnetic wave penetrating into the electromagnetic wave of the grid mesh from the invariable electromagnetic waves of other paths; and the changing signals carry the dielectric information of the sample to be measured, and the coefficients such as the amplitude in the changing curve are employed to perform evolution of the dielectric constant of the sample to be measured. In a stable environment, the changing of the network parameters with the polarization grid angle is not sensitive to the electromagnetic environment, and therefore the influences of the electromagnetic wave diffraction and diffraction in the experiment environment is effectively reduced. Besides, focusing lens antennas employ lossy material polylactic acid (PLA) to effectively reduce the multiple reflection of electromagnetic wave between the antennas to allow an experiment result to be more accurate.

The present invention provides lens antennas that include a plurality of radiating elements and a lens positioned to receive electromagnetic radiation from at least one of the radiating elements, thelens comprising a composite dielectric material. The composite dielectric material comprises expandable gas-filled microspheres that are mixed with an inert binder, dielectric support materials such as foamed microspheres and particles of conductive material that are mixed together.

The invention belongs to the technical field of lens antennas, and discloses an ultra-wideband lens antenna based on periodic semi-height pins. The lens antenna comprises a lens body, a feed source, supporting blocks and screws; the lens body is composed of two layers of metal plates with the periodic translation symmetric half-height pins, the sides, provided with the pins, on the metal plates are arranged oppositely, and an air gap is reserved between the sides; the pins on the upper metal plate horizontally move by half of a unit period in the periodical distribution direction relative to the pins on the lower metal plate; the feed source is a rectangular waveguide and is located on one side of the lens body, and the height of the narrow edge at the tail end of the waveguide is the sumof the height of the edge pin of the lens body and the height of the air gap; the supporting blocks are located at the edges of the two sides of the lens body in the direction perpendicular to the radiation direction of the lens body; the screws are installed on the two sides of the feed source and the non-radiation edge of the lens body. The lens antenna can achieve high gain in an ultra-wide frequency band range, is easy to process and low in cost, and can be applied to the field of wireless communication such as satellite communication.

The invention discloses a hemispherical lens feed source transmitting-receiving integrated crescent lens antenna, which comprises a crescent lens, a lens extension layer, a lens support, a base, a receiving feed source antenna array and a transmitting feed source antenna array, and is characterized in that the crescent lens, the lens extension layer and the lens support are formed by a medium, the lens support is a hollow cylinder, and the base is a cylinder; the upper surface of the base is provided with the receiving feed source antenna array and the transmitting feed source antenna array, a one-dimensional scanning array or a two-dimensional scanning array is formed according to an arrangement mode of the receiving feed source antenna array and the transmitting feed source antenna array, and both the receiving feed source antenna array and the transmitting feed source antenna array comprise a plurality of hemispherical lens antennas. The hemispherical lens feed source transmitting-receiving integrated crescent lens antenna integrates a transmitting antenna and a receiving antenna, and is good in beam consistency, high in aperture efficiency, low in sidelobe, good in directivity, light in weight, easy to be integrated with a planar circuit and small in overall longitudinal dimension.

The present invention provides lens antennas that include a plurality of radiating elements and a lens positioned to receive electromagnetic radiation from at least one of the radiating elements, thelens comprising a composite dielectric material. The composite dielectric material comprises expandable gas-filled microspheres that are mixed with an inert binder, dielectric support materials such asfoamed microspheres and particles of conductive material that are mixed together.

The invention belongs to the field of lens antennas, and discloses a luneberg lens antenna dielectric material, and a preparation method and an application thereof, the luneberg lens antenna dielectric material comprises a polymer microcellular foaming coiled material with a cell diameter of 10-50 [mu] m; wherein the polymer is at least one selected from polypropylene, polyethylene, polyvinyl chloride, polystyrene, polyurethane and polycarbonate. According to the invention, the polymer coiled material is used as a raw material, and the pore foam size and distribution density of the microcellular foaming polymer can be accurately controlled by adjusting the pressure of an autoclave and the temperature/heating time of a heating pool, so that the dielectric constant with required gradient change is realized; and the luneberg lenses with different diameter requirements can be manufactured by setting the thickness and the number of turns of the coiled material.

The invention discloses a hemispherical-lens feed source transceiving integrated dual-ellipsoid lens antenna comprising a dual-ellipsoid lens, a lens extension layer, a lens support, a pedestal, a receiving feed source antenna array, and a transmitting feed source antenna array. The dual-ellipsoid lens, the lens extension layer, and the lens support are formed by media. The lens support is a hollow cylindroid body; and the pedestal is also a cylindroid body. The receiving feed source antenna array and the transmitting feed source antenna array are arranged on the upper surface of the pedestal. A one-dimensional or two-dimensional scanning array is formed by a distribution mode of the receiving feed source antenna array and the transmitting feed source antenna array. Each of the receiving feed source antenna array and the transmitting feed source antenna array includes a plurality of hemispherical-lens antennas. According to the invention, the antenna has advantages of capability of transmitting and receiving antenna integration, high design freedom, good beam consistency, high caliber efficiency, low sidelobe, high directivity, light weight, capability of integration with a planar circuit, and small overall longitudinal dimension.

The invention discloses an anti-time-varying beam sequence number modulation method suitable for a broadband large-scale millimeter wave system. A pre-compensation auxiliary beam sequence number modulation system is designed and comprises a beam selection module, a transmitting end modulator, a transmitting end pre-compensation module and a receiving end demodulator, wherein the transmitting end and the receiving end of the system are respectively provided with Nt-dimensional and Nr-dimensional lens antennas, and the number of radio frequency chains is far less than the dimension of the antennas, and the radio frequency chain is connected with the antenna through a selection network. The method comprises the steps: determining a sequence number modulated beam set; mapping the serial numbermodulation symbol at the subcarrier into a symbol of quadrature amplitude modulation or phase offset modulation, and performing calculating to obtain a radio frequency link input signal through the serial number modulation symbol; and obtaining a demodulation signal at the subcarrier to realize demodulation of the receiving end. By adopting the technical scheme provided by the invention, the complexity of serial number modulation design can be effectively reduced, the corresponding serial number modulation has good time-varying resistance, and the loss of system error code performance and spectral efficiency is avoided.

The invention relates to an all-metal part Maxwell fisheye lens wide-angle coverage multi-beam antenna, and belongs to the technical field of lens antennas. According to the multi-beam lens antenna, a complete two-dimensional Maxwell fisheye lens is cut along a straight line, and a feed source array arranged along a straight line is adopted; port switching and frequency scanning are combined, and the antenna comprises an upper layer metal cover plate A, a lower layer metal cover plate B, a six-port network upper half part C1, a six-port network upper half part C2, a six-port network lower half part D, a metal ring E1 and a metal ring E2. The beam pointing directions of the pitching surface are respectively 20 degrees and 0 degree, and the working frequency range is 33 to 36 GHz. The beam coverage rate is improved in a limited space; meanwhile, feed sources are arranged along a straight line and are easily integrated in the system; cutting is carried out, so that the size of the lens is reduced; by utilizing the characteristics of the cut Maxwell fisheye lens, azimuth angle scanning exceeding +/-90 degrees is realized; return loss and isolation are good, and radiation efficiency is high.

The present invention relates to a novel lens antenna with a 3D near-field focus-steering capability that operates at gigahertz and terahertz frequencies. The novel antenna includes a pair of discrete dielectric lenses fed by a stationary horn source. In-plane synchronous counter-rotation and co-rotation of the lens pair steers its near-field focus radially and azimuthally, respectively, while linear translation of the upper lens moves the focal point longitudinally. The steering focus beam enables fast imaging. In imaging applications, the radiated beam from the novel lens antenna focused in the target area can reduce undesired interference from neighboring structures and increase the system dynamic range and signal-to-noise ratio.

The invention relates to an ultra-wideband planar focusing lens antenna and a design and imaging method thereof, and belongs to the field of lens antennas and optical imaging. The method comprises the following steps: performing quasi-conformal transformation on a ball luneberg lens, performing reasonable discretization on a transformed non-uniform dielectric constant, analyzing the influence of different discretization conditions on a focal spot and an angular resolution in a broadband, determining the optimal discretization of the dielectric constant, and realizing high-resolution imaging on a focal plane in the broadband. The system has high imaging resolution of real-time imaging in a wide-angle range, when plane waves in different directions are incident in an imaging range of +/-30 degrees, the size consistency of 3dB focal spots imaged on a focal plane is good, and a real-time imaging structure is simple.