10 results about "Artificial dielectrics" patented technology

A frequency selective structure featuring one or more layers of artificial dielectric matching elements. The artificial dielectric matching elements have an open distal end and a closed base end. The closed base end of each artificial dielectric matching element is disposed on or adjacent to a first surface of a substrate. Artificial dielectric matching elements can also be disposed on or adjacent a second surface of the substrate. The substrate can be configured as a frequency selective surface. The artificial dielectric matching elements can have interior volumes that are wider adjacent to the open distal end, and narrower adjacent to the closed base end. Any non-conductive material can be used to form the artificial dielectric matching elements. The artificial dielectric matching elements can be placed using automated pick and place operations.

An isolator based on a waveguide-based artificial dielectric medium is scalable to a range of desired terahertz frequencies, has non-reciprocal transmission and provides low insertion loss and high isolation at various tunable terahertz frequencies, far exceeding the performance of other terahertz isolators, and rivaling that of commercial optical isolators based on the Faraday effect. Because terahertz artificial dielectrics are low loss, inexpensive, and easy to fabricate, this approach offers a promising new route for polarization control of free-space terahertz beams in various instrumentation applications. Artificial dielectrics are man-made media that mimic properties of naturally occurring dielectric media, or even manifest properties that cannot generally occur in nature. A simple and effective strategy implements a polarizing-beam-splitter and a quarter wave plate to form a highly effective isolator. Performance of the device is believed to exceed that of any other experimentally demonstrated method for isolation of back-reflections for terahertz beams.

A millimeter wave antenna device (1) is provided, comprising at least one first antenna array (2) comprising a plurality of antenna elements (2a), e.g. patch antennas, and an artificial dielectric structure (3) superimposed on the first antenna array (2). The artificial dielectric structure (3) comprises a plurality of conductor layers (4) separated by dielectric layers (5), each conductor layer (4) comprising a plurality of periodically repeated conductor patterns (6). One conductor pattern (6) of each conductor layer (4) is associated with one of the antenna elements (2a), and the conductor patterns (6) associated with one antenna element (2a) are at least partially different. The artificial dielectric structure (3) has an artificial permittivity, and each dielectric layer has a natural permittivity, the artificial permittivity depending at least partially on the natural permittivity, preferably having a value between 10 - 30. This configuration provides a method to achieve multi-surface beam coverage, e.g. by end-fire antenna elements and broadside antenna elements, while maintaining a compact footprint.

A cylindrical focusing lens, including a dielectric radome (9, 49) and artificial dielectric material, in which the artificial dielectric material includes a plurality of sheets of a foam dielectric material disposed in layers and a plurality of conductive tubes placed in the sheets of the foam dielectric material, in which the conductive tubes disposed in the sheets of the foam dielectric material form a circle (5, 45) and a ring (8, 48) surrounding the circle (5, 45) and separated from the circle (5, 45) and from the radome (9, 49) by rings (10, 12, 50, 52) of the foam dielectric material without the conductive tubes. The aforementioned lens overcome the deficiencies of the known lenses made of lightweight artificial dielectric material and is well matched with a free space. Additionally, the lens is simpler to manufacture than known analogous.

The invention relates to the technical field of radar technology and wireless communication, and discloses an asymmetric high-isolation dual-polarization tight-coupling phased-array antenna and array, and the antenna comprises an impedance matching layer, an antenna radiation layer, an antenna supporting layer and a metal floor which are stacked from top to bottom. The impedance matching layer comprises a top artificial dielectric layer, a middle dielectric substrate and a bottom dielectric substrate; the antenna radiation layer comprises two groups of asymmetrical dipoles which are orthogonally arranged and a coupling capacitor structure; the antenna supporting layer is provided with an asymmetric feed short circuit column and a metal rib belt; and the metal floor is provided with an integrated stepped impedance matching feed through hole. On the basis of ensuring the matching bandwidth and wide-angle scanning, the polarization isolation performance of the dual-polarization low-profile tight coupling is improved.

The present invention belongs to the field of antenna technology and discloses a double-layer artificial dielectric multi-beam Luneburg lens antenna, a control method, and an application thereof, comprising an upper cover plate, a lower cover plate, a cylindrical Luneburg lens, and a feeding system. The cylindrical Luneburg lens is divided into two layers, an inner layer and an outer layer, and a gradient dielectric constant effect is achieved by drilling holes in the inner layer's high dielectric constant medium and filling the outer layer's low dielectric constant medium. The feeding system includes a waveguide power divider and a feeding horn. Furthermore, by utilizing a design in which the periphery of the lens is air, the end of the horn is embedded in the lens to ensure that its phase center coincides with the focal line of the lens. The feeding system and the two cover plates jointly perform a fixing and feeding function. The present invention makes lens processing simpler and focusing more accurate. Furthermore, by utilizing a feeding method combining a power divider with multiple small-sized horns, a wider azimuth beam width is achieved compared to single-horn feeding. Rapid scanning coverage within a wide angular range can be achieved by switching fewer feeding ports and switches.

The present disclosure provides an artificial dielectric material, a lens unit, a fabrication method for the lens unit, and a lens antenna. The artificial dielectric material includes a substrate and multiple conductive materials. The substrate is configured as a porous structure and defines multiple microporous chambers. The multiple conductive materials are disposed on all side walls of the multiple microporous chambers, where a shape of the multiple microporous chambers and / or at least one of a shape, size, or density of the multiple conductive materials are adjusted to obtain desired effective dielectric constants.