Abstract: A radio wave absorber for use in an electromagnetic field probe that measures an electromagnetic field by means of an antenna section provided therewith, the radio wave absorber including: a first end section; a second end section that is located at a position opposite the first end section; and an intermediate section that is located between the first and second end sections, the intermediate section having outer dimension and thickness that increase in accordance with a distance from the first end section toward the second end section.

Abstract: An electromagnetic wave reverberation chamber includes: an electromagnetic wave absorbing apparatus installed in an intended space of the electromagnetic wave reverberation chamber for adjusting a reflection characteristic of an inside of the electromagnetic wave reverberation chamber, wherein the electromagnetic wave absorbing apparatus have an electromagnetic bandgap structure including a plurality of unit cells arranged periodically.

Abstract: The present invention is generally directed to an artificial dielectric composite having an electrically non-conducting substrate, an electrically non-conducting pattern on the substrate, and an electrically conducting coating on the pattern. The substrate may be a textile such as paper. The electrically non-conducting pattern may comprise palladium. A direct-write device, such as an inkjet printer, may be used to print the pattern onto the substrate. The electrically conducing coating may comprise nickel, gold, palladium, cobalt, iron, copper, or any combination thereof. Also disclosed is the related method of making the artificial dielectric composite.

Abstract: A polymer-based coating includes nickel nanostrands dispersed within a polymer, and a pigment that is conductive or semi-conductive dispersed in the polymer.

Abstract: Various aspects of the present invention are shown and described, each of which has stand alone utility in a navigated medical environment. A receiver position calibration system and method facilitates calibration of a reference frame prior to each navigated procedure. A concept and application of confidence weights is introduced. Confidence weights can be applied to distance calculations to mitigate the effects of interference and increase the tolerance of the navigated medical system. Multi-path interference is minimized through the transmission of a signal having a pattern of unique frequencies and filtering of the distance calculations for each frequency to identify the ‘best’ distance in the presence of multi-path interference. A position determination method and system that transmits a signal having multiple frequency components permits positions to be identified with high resolution over a large area.

Abstract: An electromagnetic absorber using resistive material includes a ground plane of a conductive material; a dielectric layer formed on the ground plane; and a pattern layer in which specific unit cell patterns made of a resistive material are periodically arranged on the dielectric layer. The electromagnetic absorber is applied to an electronic toll collection system, a transportation device, a building structure, an electronic device and an anechoic chamber.

Abstract: An instrumentation structure includes a sensor array and a support structure. The sensor array is rotatable around multiple axes. Radar absorbent material (RAM) is adapted to conform to non-planar exterior surfaces of the instrumentation structure.

Abstract: A radio wave absorption material is characterized to be obtained by firing a ferrite material that is formed by adding an accessory component, 0.1 to 2 wt % of CoO, to an oxide magnetic material containing main components, 30 to 49.5 mol % of Fe2O3, 0.5 to 20 mol % of Mn2O3, 5 to 35 mol % of ZnO, 0.2 to 15 mol % of (Li0.5Fe0.5)O and MnO as the rest. In the above-mentioned composition, part of ZnO may be replaced with 20 mol % or less of CuO. This radio wave absorption material has high strength and humidity stability and has excellent radio wave absorption performance although low in cost.

Abstract: A radio wave absorber for use in an electromagnetic field probe that measures an electromagnetic field by means of an antenna section provided therewith, the radio wave absorber including: a first end section; a second end section that is located at a position opposite the first end section; and an intermediate section that is located between the first and second end sections, the intermediate section having outer dimension and thickness that increase in accordance with a distance from the first end section toward the second end section.

Abstract: A radio wave absorber for use in an electromagnetic field probe that measures an electromagnetic field by means of an antenna section provided therewith, the radio wave absorber including: a first end section; a second end section that is located at a position opposite the first end section; and an intermediate section that is located between the first and second end sections, the intermediate section having outer dimension and thickness that increase in accordance with a distance from the first end section toward the second end section.

Abstract: A radio wave absorber for use in an electromagnetic field probe that measures an electromagnetic field by means of an antenna section provided therewith, the radio wave absorber including: a first end section; a second end section that is located at a position opposite the first end section; and an intermediate section that is located between the first and second end sections, the intermediate section having outer dimension and thickness that increase in accordance with a distance from the first end section toward the second end section.

Abstract: A rectangular RF anechoic chamber, where the material or absorbing material attached to its feeding wall has a homogeneous property on X-Y plane, i.e. the plane parallel to the feeding wall. The MA(s) are mounted on the feeding wall from which the material with a homogeneous property will reduce interferences from the fields which produce scattered fields from the wall; and may produce a quiet zone with significantly improved quality, and specially at low frequency band. Quiet zone quality means the field uniformity in the test zone.

Abstract: A microwave absorber, especially for high temperature applications, has at least one resistive sheet and at least one dielectric layer. The resistive sheet has a material of construction that is a MAX phase material.

Abstract: A material of variable emissivity includes a first metallic layer having a first aperture, a second metallic layer having a second aperture, and a variable dielectric layer interposed between the first metallic layer and the second metallic layer.

Abstract: A radar camouflage fabric comprising a base fabric layer and a conductive garnish fabric layer attached to the base fabric layer. The conductive garnish fabric layer comprises a conductive polymer coating and a plurality of holes. The radar camouflage fabric has an average microwave transmission of less than 50% at 6-8 GHz and the conductive garnish fabric layer has an electrical surface resistance less than the electrical surface resistance of the base fabric layer.

Abstract: An exemplary embodiment of the present invention comprises a radio frequency absorber that is operative for absorbing electromagnetic energy, scattering electromagnetic signals, and/or attenuating electromagnetic signals. In accordance with certain aspects of the invention, the radio frequency absorber is substantially flat and comprises an absorbing surface. The absorbing surface is operative to absorb electromagnetic energy, scatter electromagnetic signals, and/or attenuate electromagnetic signals. In exemplary embodiments of the invention, the radio frequency absorber comprises a plurality of holes disposed within the radio frequency absorber. The radio frequency absorber, according to various embodiments of the present invention, is configured to reduce cavity oscillations and/or cavity modes and resonances within an integrated circuit device, such as a device that houses a monolithic microwave integrated circuit.

Abstract: An electromagnetic wave absorber includes a ground layer made of a metal conductor, a dielectric layer formed on the ground layer, and a unit cell pattern made of a resistive material, and formed on the dielectric layer. The unit cell pattern includes a fundamental patch having a regular square shape, in which a rectangular recess is formed on the center of each of the respective sides, the fundamental patch being located at the center of each of the unit cell pattern, and half cross dipole patches, which are respectively disposed at the four sides of the fundamental patch at a regular angle so as to be engaged with the recesses formed on the respective sides of the fundamental patch at a regular interval.

Abstract: The integrity of operation of a GPS precision aircraft approach and landing system may be compromised by error producing effects of reflected multipath signals. An integrity monitor antenna system as disclosed may utilize both attenuation and shadowing of reflected multipath GPS signals to achieve extreme multipath mitigation of the order of 50 dB suppression. An antenna with a right-hand circular polarization pattern having a sharp cut off at the horizon may provide 30 dB suppression of reflected multipath signals. A signal absorbent ground plane bed of defined dimensions may provide 20 dB attenuation of incident multipath signals. A signal/processor may be employed to derive position error data for integrity monitoring, based upon differentials between a known fixed location and a current GPS-indicated location. Communication of identification of a subset of particular GPS satellites for common usage may also reduce potential error levels.

Abstract: Methods and apparatus for providing a tunable absorption-emission band in a wavelength selective device are disclosed. A device for selectively absorbing incident electromagnetic radiation includes an electrically conductive surface layer including an arrangement of multiple surface elements. The surface layer is disposed at a nonzero height above a continuous electrically conductive layer. An electrically isolating intermediate layer defines a first surface that is in communication with the electrically conductive surface layer. The continuous electrically conductive backing layer is provided in communication with a second surface of the electrically isolating intermediate layer. When combined with an infrared source, the wavelength selective device emits infrared radiation in at least one narrow band determined by a resonance of the device. In some embodiments, the device includes a control feature that allows the resonance to be selectively modified.

Abstract: Methods and apparatus for providing a tunable absorption band in a wavelength selective surface are disclosed. A device for selectively absorbing incident electromagnetic radiation includes an electrically conductive surface layer including an arrangement of multiple surface elements. The surface layer is disposed at a nonzero height above a continuous electrically conductive layer. An electrically isolating intermediate layer defines a first surface that is in communication with the electrically conductive surface layer. The continuous electrically conductive backing layer is provided in communication with a second surface of the electrically isolating intermediate layer. The arrangement of surface elements couples at least a portion of the incident electromagnetic radiation between itself and the continuous electrically conductive backing layer, such that the resonant device selectively absorbs incident radiation, and reflects a portion of the incident radiation that is not absorbed.

Abstract: In a double glazing where a pair of transparent glass sheets are arranged at an interval by having a spacer at the circumferential end portion and where a hollow layer sealed between the pair of glass sheets is formed, there is provided an electromagnetic absorption board used for wireless LAN, which is characterized in that the thickness of the glass sheet is in a range of 2.5-20 mm, that the thickness of the hollow layer is in a range of 2.5-15 mm, that at least one glass sheet of the pair of glass sheets is formed with a resistive film having a surface resistance (surface resistivity) in a range of 20?/? to 2 k?/?, and that the resistive film is formed on a glass sheet side on the hollow layer side.

Abstract: An electromagnetic absorber assembly capable of minimizing reflectivity caused by reflected and diffracted waves within a test chamber is presented. The absorber assembly includes a plurality of first wedges and a plurality of second wedges disposed in a symmetrical arrangement so as to form a continuous and smoothly changing v-shaped pattern along one or more walls of an anechoic test chamber. Each wedge has a triangular-shaped first end and second end formed by a pair of side walls and a base wall. One second end of each first wedge contacts and covers one first end of each second wedge along a contact plane. First and second wedges are disposed at a first angle and a second angle, respectively, about the contact plane in a symmetrical arrangement. The assemblies described could be installed on a flat or shaped absorber base or wall to divert reflected and refracted fields away from a quiet zone.

Abstract: An electromagnetic absorber assembly (10) capable of minimizing reflectivity caused by reflected and diffracted waves within a test chamber (1) is presented. The absorber assembly (1) includes a plurality of first wedges (11) and a plurality of second wedges (11) disposed in a symmetrical arrangement so as to form a continuous and smoothly changing v-shaped pattern along one or more walls (5-7) of an anechoic test chamber (1). Each wedge (11) has a triangular-shaped first end (26) and second end (27) formed by a pair of side walls (16, 18, or 19) and a base wall (17). One second end (27) of each first wedge (11) contacts and covers one first end (26) of each second wedge (11) along a contact plane (15). First and second wedges (11) are disposed at a first angle (46) and a second angle (47), respectively, about the contact plane (15) in a symmetrical arrangement.

Abstract: Various embodiments provide systems and methods for fabricating composite laminate structures with co-laminated radar absorbing material. An example embodiment includes providing a component part fabricated from composite laminate and having an inside surface and an outside surface; providing a portion of radar absorbing material (RAM) having an inside surface and an outside surface; positioning the outside surface of the component part against the inside surface of the portion of RAM to form an assembly; and applying pressure to the assembly thereby causing the portion of RAM to bond to the outside surface of the component part.

Abstract: A communications module includes an interior configuration designed to intercept, disrupt, and scatter EMI produced by the module during operation. The interior configuration may include an anechoic structure that includes a plurality of anechoic elements positioned proximate EMI-producing components within the module. The anechoic elements may form truncated pyramids, columns having rounded tops, cones, or other shapes. The anechoic elements may be uniform or non-uniform in size, length, or shape and can be arranged in a periodic, non-periodic, or random pattern. In some embodiments, the anechoic elements may include cast zinc metal, Nickel, and/or radiation absorbent material, such as a mixture of iron and carbon. In operation, EMI impinging on the anechoic elements is scattered by their surfaces until absorbed by the elements or other structures of the module, thereby preventing the EMI from exiting the module.

Abstract: A structure and a method for modifying an existing design of structure are provided, wherein the structure is provided to at least partially enclose an object that has a large radar cross section. The structure comprises a non-metallic portion having a radar-reflective layer applied to an inclined surface of the structure. The inclined surface is arranged with one or more angles of inclination selected so that the radar cross-section for the structure has a value that is lower than that for the object enclosed in one or more frequency ranges. In a preferred variation, an at least partially detached and appropriately shaped radar-reflective structure may be provided as an alternative to or to supplement the modification of an existing enclosure.

Abstract: An antenna for a fill level radar includes a high-temperature process separation device and an attenuation element. The attenuation element is used to improve the measuring signal in the near zone of the antenna and is affixed to the process separation device or in the process separation device. In this way antenna ringing may be significantly reduced.

Abstract: A thin, light and soft electromagnetic wave absorber is disclosed exhibiting an excellent workability. The first conductor element group of a first conductor element layer consists of aligned cross conductor elements and square conductor elements in regions surrounded by cross conductor elements. A radio wave incident from the first conductor element layer side is received by each element, internally subjected to multiple reflection and then absorbed by a first loss material layer. Since the first conductor element group is realized by the cross conductor elements and the square conductor elements, receiving effect is enhanced and the radio wave can be collected with a high collection efficiency.

Abstract: A structure, and a method for modifying the design of a structure, are provided such that the structure includes features designed to reduce and preferably minimize the radar cross-section of the structure over one or more predetermined frequency ranges. A structure is provided having an inclined surface, wherein the angle of inclination is selected for which the level of radar cross section is below a local maximum in the sidelobes in each of the scattering patterns of incident electromagnetic radiation at frequencies within one or more predetermined frequency ranges. In the particular case of a tower, for example of a wind turbine, the radar cross-section of the tower may be minimized for two or more radar bands by appropriate selection of the angle of inclination of a frusto-conical portion of the tower. Ideally, the tower is constructed entirely in the form of a cone frustum.

Abstract: In order to provide a radio wave absorber that can be produced easily and has excellent radio wave absorption characteristics, a conductive surface 2 of a conductive paint 6 is formed on one surface 1a of a mat-shaped inorganic fiber bulk material 1.

Abstract: An infrared camouflage coating system for application to the strategic surfaces of jet engine components comprised of a metal alloy substrate having an oxidized surface and a ferrous sulfide containing silicate glass bonded thereto.

Abstract: A camouflage coating system for application to the surfaces of jet engine components in order to reduce their level of emitted energy there by rendering them undetectable by infrared detection systems. The camouflage coating comprises a multilayer system having a first diffusion barrier of nickel aluminide applied to the substrate surface. A second silver reflective layer superimposed on the diffusion barrier layer and a glass-ceramic protective overlay superimposed on the silver reflective layer.

Abstract: A sheet material for a radio wave absorber and a radio wave absorber formed from the sheet material, where the sheet material is light weighted and has excellent form-retaining capability and workability for field assembling. A sheet material (1) for a radio wave absorber has a corrugated paperboard structure with an undulated corrugated medium (2) and a planar liner (3) that are layered over each other. The corrugated medium (2) and/or the liner (3) are constructed from a sheet including an electrical-loss material. A radio wave absorber (10) is characterized in that the sheet material (1) for a radio wave absorber is cut, folded, and assembled as a hollow three-dimensional structure body, which has a shape of wedge, polygonal pyramid, or polygonal cylinder.

Abstract: A radio wave absorber for use in an electromagnetic field probe that measures an electromagnetic field by means of an antenna section provided therewith, the radio wave absorber including: a first end section; a second end section that is located at a position opposite the first end section; and an intermediate section that is located between the first and second end sections, the intermediate section having outer dimension and thickness that increase in accordance with a distance from the first end section toward the second end section.

Abstract: A reflective layer for attenuating electromagnetic radiation, the layer comprising at least one reflective component, the latter being selected from the group containing the following substances: carbon particles or fibers, in particular carbon black and/or graphite and/or an electrically conductive graphite compound, metal particles and/or fibers, in particular copper, aluminum, steel, titanium and/or iron particles of fiber and metal alloy particles. The reflective layer is characterized in that it attenuates electromagnetic radiation in a 200Hz to 10 Ghz range by more than 10Db, that it is watertight and permeable to water vapor, in addition to being resistant to the elements and designed to produce a potential compensation. The invention also relates to a method for assembling the reflective layer.

Abstract: An electromagnetic wave absorbing plate composed of a transparent plate-like dielectric, wherein a thickness of the dielectric is determined such that an electromagnetic wave absorption quantity determined by using an incident side impedance Zxi at a time at which the electromagnetic wave becomes incident on a surface of the dielectric is equal to or higher than 10 dB.

Abstract: A metallically gross layer decorative molded article for use in the beam path of a radar device has a luxurious metallic design similar to the color tone of a chrome plating and the like that does not hinder the transmission of radio wave. The metallically gross layer decorative molded article includes a substrate comprised of a transparent resin layer, a tin and/or tin alloy layer provided on a back surface of the substrate, and a decorative paint layer provided on a back surface of the tin and/or tin alloy layer.

Abstract: The shielded mounting module comprises a cover member and a box member . The box member includes a plurality of bosses formed in the bottom surface. Each of the bosses provide an electrical contact point and are soldered to corresponding electrical pads on a circuit board, for example, grounded pads on the circuit board. The bosses also serve as stand-offs or spacers to mount the module above the surface of the circuit board. In another embodiment, the bosses are formed as a pair of rails.

Abstract: The present invention provides an all-weather radio wave absorber having reflector capable of smoothly attenuating harmful microwave or millimeter wave from 400 MHz to 100 GHz generated from various electronic devices so that bad effects on human body or electronic device can be eliminated. The all-weather radio wave absorber having reflector comprises a laminated radio wave absorbing composite comprising a foamed upper radio wave absorber 1 with a rugged surface or a flat surface including conductive particles such as carbon particles, ferrite particles or the like in continuous foams 2 formed therein, one or more foamed intermediate planar radio wave absorbers 3 including conductive particles such as carbon particles 7, ferrite particles or the like in continuous foams 2 formed therein, a thin radio wave reflector 4 at the bottom, and a flexible cover for wrapping the laminated absorbers and reflector together.

Abstract: A method for manufacturing an antenna or antenna array and the antenna or antenna array itself with an operating frequency band, including antenna elements. The antenna or antenna array is integrated in a vehicle structure wherein a radar absorbing material structure, conforming to the shape of the vehicle structure and including at least one layer of radar absorbing material with an inner surface facing the antenna element and an outer surface being an outer surface of the vehicle structure, is mounted in front of the antenna elements. Each radar absorbing material-layer is defined by a thickness and frequency dependent radar absorbing material properties: relative permittivity relative permeability.

Abstract: A radar level gauging system comprising a microwave unit for transmitting and receiving first microwaves having a first and second distinguishable characteristics, a microwave absorber adapted to be arranged in a bottom region of the tank and adapted to absorb electromagnetic energy of microwaves having one of the first and second characteristics, and processing circuitry adapted to determine the product level based on a relationship between transmitted and received microwaves. The system thus emits microwaves in two channels, and the absorber is arranged to absorb energy in only one of the channels. Using the absorbed channel, it is possible to obtain a measurement with very limited interference from the bottom, which thus will be accurate also for levels close to the bottom. Using the unabsorbed channel, it is possible to obtain a reference measurement of the distance to the reflecting part of the absorber, thus enabling verification of the of the system.

Abstract: A radar wave camouflage structure is disclosed. The radar wave camouflage structure comprises a substrate; a first layer on the substrate, comprising a first polymer matrix; magnetic nanoparticles dispersed in the first polymer matrix, wherein the magnetic nanoparticles comprise a mixture of Fe3O4, Fe3O4-4C carbide, Fe3O4—Ni composite and Fe2O3; a second layer on the first layer, comprising a second polymer matrix; and carbon black dispersed in the second polymer matrix.

Abstract: An exterior vehicle component includes a proximity member disposed along an outer perimeter of an electromagnetic wave transmission member provided at a center of the component which is disposed in front of a radar device. The proximity member includes a chromium-plated portion formed on its front surface which reflects an electromagnetic wave. The proximity member is formed of an acrylate-styrene-acrylonitrile resin or a modified polyphenylene oxide resin having an attenuation coefficient for electromagnetic wave transmission, which is equal to or greater than a predetermined value.

Abstract: The present invention provides an all-weather radio wave absorber having reflector capable of smoothly attenuating harmful microwave or millimeter wave from 400 MHz to 100 GHz generated from various electronic devices so that bad effects on human body or electronic device can be eliminated. The all-weather radio wave absorber having reflector comprises a laminated radio wave absorbing composite comprising a foamed upper radio wave absorber 1 with a rugged surface or a flat surface including conductive particles such as carbon particles, ferrite particles or the like in continuous foams 2 formed therein, one or more foamed intermediate planar radio wave absorbers 3 including conductive particles such as carbon particles 7, ferrite particles or the like in continuous foams 2 formed therein, a thin radio wave reflector 4 at the bottom, and a flexible cover for wrapping the laminated absorbers and reflector together.

Abstract: An electromagnetic wave absorber has a configuration in which at least three hollow tetrahedrons, each having one open face, are connected to one another so that each surface opposite to a respective open face of the hollow tetrahedrons defines a respective side face of a hollow pyramid. Preferably, the electromagnetic wave absorber is made of sheet electromagnetic wave absorption members, which have a corrugated board structure in which at least one sheet includes an electrically conductive material. The electromagnetic wave absorber is low-cost, has reduced transport volume, excellent electromagnetic wave absorption characteristics from low frequency to high frequency with a shorter absorber length, has no or small difference in characteristics due to polarization plane, is lightweight and high in structural strength, and easy to manufacture and install.

Abstract: A communications module includes an interior configuration designed to intercept, disrupt, and scatter EMI produced by the module during operation. The interior configuration may include an anechoic structure that includes a plurality of anechoic elements positioned proximate EMI-producing components within the module. The anechoic elements may form truncated pyramids, columns having rounded tops, cones, or other shapes. The anechoic elements may be uniform or non-uniform in size, length, or shape and can be arranged in a periodic, non-periodic, or random pattern. In some embodiments, the anechoic elements may include cast zinc metal, Nickel, and/or radiation absorbent material, such as a mixture of iron and carbon. In operation, EMI impinging on the anechoic elements is scattered by their surfaces until absorbed by the elements or other structures of the module, thereby preventing the EMI from exiting the module.

Abstract: An electromagnetic wave absorber includes a first electromagnetic wave absorbent member containing a magnetic loss material, and a second electromagnetic wave absorbent member containing a conducting material arranged in front of the first electromagnetic wave absorbent member. The second electromagnetic wave absorbent member has a shape including an aperture at a tip of a hollow cone.

Abstract: A multi-element antenna with sufficiently small return loss and mutual coupling signals to allow the simultaneous transmission of powerful radar signals and the reception of faint target return signals. The microstrip patch antenna has radio frequency absorbing material place between neighboring antenna elements to reduce the mutual coupling leakage signals.

Abstract: An electromagnetic radiation absorber for absorbing radiation in the wavelength range ?min to ?max. The absorber has a conductor layer in contact with a dielectric layer. The conductor layer carries a plurality of apertures of sub-wavelength dimension and the thickness of the absorber is less than ?min/4n, where n is the refractive index of the dielectric. The dielectric layer may be sandwiched between two conductor layers, one of which has the structure described above. The invention is also directed to various articles comprising such an absorber.

Abstract: An antenna structure including an antenna 10 with an outer main surface 11, where said antenna 10 is integrated in a surface of a surrounding material 20. Further comprising a transition zone 30 arranged along the perimeter of the main surface 11 and overlapping the main surface, where the transition zone 30 comprises a layer of a resistive material with a resistivity that varies with the distance from an outer perimeter of the transition zone 30 to enable a smooth transition of the scattering properties between the antenna 10 and the surrounding material 20.