6 results about "Artificial dielectrics" patented technology

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 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.