49results about How to "Achieve stealth" patented technology

The invention discloses a broadband bionic yagi antenna with a low radar cross section and mainly solves the problems of high radar cross section and relatively narrow band width in the traditional yagi antenna. The antenna simulates an opposite phyllotaxis plant leaf structure and comprises a director (2), a radiating element (3), a parallel strip line (4), a reflector (5) and a coaxial conversion joint (6). The radiating element (3) is of an oval structure, the director (2) simulates a feather-shaped leaf structure, and the reflector (4) is a rectangle patch with a tooth-shaped structure. The radiating element (3) is printed on a top layer and a bottom layer of a double-layer medium material plate (1) and respectively connected with an inner core and an outer core of the coaxial conversion joint (6) by the parallel strip line (4); the director (2) is printed on the top layer of the double-layer medium material plate (1); and the reflector (4) is printed between two layers of the double-layer medium material plate (1). The broadband bionic yagi antenna with the low radar cross section has the advantages of wide frequency band and good invisibility performance and can be used on an invisible target carrier.

The invention discloses an infrared stealth material with a multilayer structure. A core layer is hydrogel, and an auxiliary layer / auxiliary layers is / are added to one side or both sides of the core layer. The hydrogel has high specific heat capacity, and can absorb a large amount of heat on the premise of no significant change in temperature to achieve the function of heat buffering; the hydrogelserves as the core layer, so that the thermal infrared characteristics of covered objects can be reduced, and self-adaption to the environmental infrared radiation characteristics is realized to achieve infrared stealth. When the hydrogel serves as a cover, a heat-conductive fixing device is arranged on the edge of the infrared stealth material, and is communicated with a heat conducting layer toachieve controllable directional heat conduction; radar wave absorbing materials can be composited on any layer of the multilayer structure, and an infrared radiation and camouflage layer can be prepared at the outermost layer, so that infrared, radar wave and visual stealth is realized at the same time; the multilayer structure can be lined with breathable fabric to meet the air-permeability requirements of soldiers during long-time hiding. The infrared stealth material with high infrared, radar and visible-light stealth capability has the advantages of simple preparation process, low cost,portability and multifunction.