摘要:
The disclosure relates to an antenna reflector phase correction film and a reflector antenna. The antenna reflector phase correction film includes a first substrate, a second substrate, and multiple artificial microstructures disposed between the first substrate and the second substrate, the artificial microstructures are wires made of electrically conductive materials, and an electromagnetic wave, emergent after being reflected by an antenna reflector attached with the antenna reflector phase correction film, has an equiphase surface. According to the disclosure, the antenna reflector phase correction film has specific refractive index distribution internally, so that a surface emergent phase of a reflector can be corrected after attaching onto a surface of a conventional reflector, a phase error caused due to installation or processing is improved, a complete flat emergent equiphase is obtained, and then a far-field performance (such as a higher gain) is improved.
摘要:
The invention concerns a reflector (8) of radio frequency (RF) energy. The reflector includes a first web layer (9a) formed from a knit of at least a first conductive filament (11a), and a second web layer (9b) formed of a knit of at least a second conductive filament (11b). The first and second web layers can be formed as an open mesh 10. The second web layer is positioned on the first web layer to form a stack. Fastening members (14, 16) are disposed at intervals across a surface of each of the first and second web layers. The fastening members are advantageously configured to secure the first web layer to the second web layer. The invention also concerns a reflector antenna formed using the reflector of radio frequency energy. The reflector antenna includes antenna support elements (18), and the first and second web layers are secured to the antenna support structure to define a curved three dimensional surface.
摘要:
A chaff element for interfering with radar signals. The chaff element has a dielectric substrate and a pair of elongate electrically conductive elements, having a total length of approximately one-half wavelength of the radar signals or otherwise tuned to the radar signals, disposed on the dielectric substrate. A switch is arranged to electrically couple the pair of elongate elements together in response to a control signal generated by an oscillator circuit and a battery. The chaff element can be used in a method of providing a countermeasure against radar signals. A plurality of chaff elements can be deployed in an airspace above a radar unit emitting a radar signal and interfere with the radar signal by opening and closing the switches of the chaff elements while deployed in said airspace above the radar unit.
摘要:
A chaff element for interfering with radar signals. The chaff element has a dielectric substrate and a pair of elongate electrically conductive elements, having a total length of approximately one-half wavelength of the radar signals or otherwise tuned to the radar signals, disposed on the dielectric substrate. A switch is arranged to electrically couple the pair of elongate elements together in response to a control signal generated by an oscillator circuit and a battery. The chaff element can be used in a method of providing a countermeasure against radar signals. A plurality of chaff elements can be deployed in an airspace above a radar unit emitting a radar signal and interfere with the radar signal by opening and closing the switches of the chaff elements while deployed in said airspace above the radar unit.
摘要:
Missile deflector systems for protecting a vehicle from threats that use an infrared sensor for guidance are disclosed. An exemplary missile deflector system can include, for example, a radiation source and one or more deployable smart chaff elements. The light source and the one or more deployable smart chaff elements can direct the threat, such as, for example, a missile, away from the vehicle or, in other embodiments, disable the threat. Another exemplary missile deflector system can include, for example, a smart chaff element with a near-infrared emitter and a plurality of transmitting fibers to transmit the near-infrared radiation out of the smart chaff element.
摘要:
A chaff element for interfering with radar signals. The chaff element has a dielectric substrate and a pair of elongate electrically conductive elements, having a total length of approximately one-half wavelength of the radar signals or otherwise tuned to the radar signals, disposed on the dielectric substrate. A switch is arranged to electrically couple the pair of elongate elements together in response to a control signal generated by an oscillator circuit and a battery. The chaff element can be used in a method of providing a countermeasure against radar signals. A plurality of chaff elements can be deployed in an airspace above a radar unit emitting a radar signal and interfere with the radar signal by opening and closing the switches of the chaff elements while deployed in said airspace above the radar unit.
摘要:
A means for preventing the opening of a chaff muffin upon its entry into air stream of its supersonic-velocity carrier rocket, said means comprising a longitudinal wrapping in addition to the usual circumferential wrapping.
摘要:
A particulate obscurant disseminator couples the shaft power of the host vehicle through a clutch and fluid coupling to a high ratio gear box whose output shaft drives a compressor of an automative-type turbocharger whose air output is fed to the input of a venturi type ejector where additional air flow is induced and mixed with pariculate from a bin supply to form an obscurant cloud.
摘要:
An article comprising a non-conductive substrate having a sub-micron thickness of an oxidizable conductive first metal coating thereon, and a second (promoter) metal which is galvanically effective to promote the corrosion of the first metal, discontinuously coated on the first metal coating. Optionally, the second metal-doped, first metal-coated substrate may be further coated with a salt, to accelerate the galvanic corrosion reaction by which the conductive first metal coating is oxidized. Also disclosed is a related method of forming such articles, comprising chemical vapor depositing the first metal on the substrate and chemical vapor depositing the second metal on the applied first metal coating, and of optionally applying a salt by salt solution contacting of the second metal-doped, first metal-coated substrate. When utilized in a form comprising fine-diameter substrate elements such as glass or ceramic filaments, the resulting product may be usefully employed as an evanescent chaff. In the presence of atmospheric moisture, such evanescent chaff undergoes oxidation of the first metal coating so that the radar signature of the chaff transiently decays.
摘要:
Small lengths of conductors, cut to the appropriate size are used as radar "chaff" or passive reflectors to give spurious returns on an enemy radar and thereby act as an electronic countermeasure. Currently used chaff includes chopped aluminum foil, aluminum coated glass fibres and silver coated nylon monofilaments. Current radars operate in the 10.sup.10 Hz region and current chaff dipoles are of centimetric size, but future radar systems are likely to operate at higher frequencies requiring shorter dipoles lengths to achieve an increased packing density the dipoles also need to be thinner. Carbon fibres have advantages over existing chaff materials as they are fine, light and much stiffer than existing chaff materials. The electrical resistance is about 1000.times.higher than that of aluminum however and this invention therefore proposes the use of carbon fibres coated with a much more conductive coating. Typical coating materials can be copper, silver aluminium applied by a number of different methods.