67 results about "Artificial structure" patented technology

The invention discloses a meta-material film for left-hand circular polarization conversion. The meta-material film has a meta-material structure at an optical frequency and comprises metal microstructure layers 1, 3 and a medium substrate layer 2. The metal microstructure layers 1, 3 are positioned on two surfaces of the medium substrate layer 2. The upper surface of the metal microstructure layer 1 is a metal surface 1, and the lower surface of the metal microstructure layer 1 is a metal surface 2. The upper surface of the metal microstructure layer 3 is a metal surface 2, and the lower surface of the metal microstructure layer 3 is a metal surface 4. The metal surface 1 is an incidence plane, and the metal surface 4 is an emitting surface. The metal microstructure layers 1, 3 are of a right-handed rotation windmill structure of chiral symmetry or a spiral right-handed rotation artificial structure of chiral symmetry. A left-handed rotation angle taking a structural center as a rotation center is arranged between the metal microstructure layer 1 and the metal microstructure layer 3. Two orthogonal components of an output light wave are identical in amplitude, and a phase difference between the two orthogonal components is odd times of 90 DEG. The structure is simple, the conversion efficiency is high, a beam of linearly-polarized light can be converted into left-hand circular polarization light, and the output beam is high in quality.

A structure for attracting fish in lakes and ponds is presented that includes a central mast with one or more angled shafts for the fish to rest upon and congregate near.

A vehicle zone monitoring apparatus that detects physical bodies present in the vicinity of the vehicle from infrared images photographed by infrared cameras provided on the vehicle includes an object extracting device that extracts object images that emit infrared radiation from the infrared image and an artificial structure identifying device that identifies whether or not an object is an artificial structure by comparing an image of a search zone in proximity to the object extracted by the object extraction device, to a reference image of a pre-registered artificial structure which serves as an element that defines an artificial structure, and that identifies the object as an artificial structure if: within the search zone in proximity to the object, a section having a high correlation with the reference image exists; and a distance between the vehicle and the object is equal to a distance between the vehicle and the section having the high correlation with said reference image.

The invention discloses an artificial structure-based multi-frequency circular polarizer, which comprises n-1 (n is an integer of greater than or equal to 3.) layers of rectangular dielectric substrates and periodic circular arc metal wire structures, wherein the periodic circular arc metal wire structures are manufactured on the n-1 layers of rectangular dielectric substrates in the transverse direction and the longitudinal direction; each periodic circular arc metal wire structure comprises t (t=n) circular arc metal wires; t circular arc metal wires are arranged on the first, the second,... ..., the nth faces of the n-1 layers of rectangular dielectric substrates respectively; seen from the direction perpendicular to the plane where the rectangular dielectric substrates are positioned, t circular arc metal wires form t equal parts of a concentric circle; the width of the t circular arc metal wires and the corresponding central angle theta are the same; and the central angle corresponding to a gap between every two circular arc metal wires is also the same. When linear polarization wave with an electric field polarization direction parallel to the longitudinal boundary of the circular polarizer enters in the direction perpendicular to the plane where the rectangular dielectric substrates are positioned, the circular polarizer can convert the incident linear polarization wave into circular polarization transmitted wave with different rotation directions at k (k=t) different frequency points.