A soft body system adapted to form the body and exterior surface of a Guided Soft Target for testing crash avoidance technologies in a subject vehicle is disclosed. The soft body system is adapted to be mounted atop a motorized Dynamic Motion Element (DME) and when so mounted is adapted to collide with the subject vehicle while the DME is moving. The soft body system includes a semi-rigid form with an exterior surface. The form is sufficiently yielding so as to impart a minimal force to the subject vehicle upon impact. The form may be shaped like a vehicle or a part of a vehicle. The exterior surface includes a side skirt made of radar absorptive material (RAM), radar reflective material (RRM) or a combination of both, which is positioned adjacent to the ground and constructed to prevent radar wave from entering the soft body system.

A switchable wire includes filaments, each of which includes a heat-activated material layer that may be indirectly heated to change its state between different states having different electrical conductivity. In an example embodiment the indirect heating may be electrically resistance heating by passing electrical current through an electrically-resistive core of the filament. The heat passing through an electrically-insulative coating around the core, and into a heat-activated material layer around the electrically-insulative coating. The heat-activated material may be a chalcogenide material that is shiftable between a crystalline electrically-conducting state and an amorphous electrically-insulating state. The state of the material may be controlled by controlling the heating profile through controlling heating in the core. Many such filaments may be twisted together to form a switchable wire. Such wires may be used in any of a variety of devices where switchable electrical conductivity is desired.

A device for the non-destructive probing of a sample by means of electromagnetic wave reflection includes a metal body as part of its frame. The metal body forms a lateral wall and a separating wall enclosing an interior space. On a first side of the metal body, a shielding structure forms a plurality of shielded chambers for receiving RF circuitry. Interior space faces the second side of the metal body. A first circuit board containing driver and receiver circuitry is mounted to the first side of the metal body, and a second circuit board containing an antenna structure is mounted to the second side thereof.

The present disclosure describes techniques for fabricating a textile article from a laminate formed by curing a reinforced fiber matrix and a resin substrate. The resin substrate may include iron oxide particles, such as iron oxide, Fe.sub.3O.sub.4, that are capable of absorbing and attenuating RF signals within a desired RF signal range, namely 0 GHz-3 GHz, 3 GHz, −8 GHz, and greater than or equal to 10 GHz. The iron oxide particles may include Fe.sub.3O.sub.4Fe, Fe.sub.3O.sub.4Ni, or Fe.sub.3O.sub.4, and/or so forth. Each iron oxide particle is selected based on the RF signal range that the textile article is intended to absorb. In other words, a change in iron oxide particle composition and proportion by volume may impact the RF signals absorbed and attenuated by the textile article.

The present disclosure describes a textile article for radio frequency (RF) absorption and attenuation. The textile includes a laminate that is formed via curing a wet laminate at room temperature for a cure time, the wet laminate comprising a resin substrate and a reinforced fiber matrix. The reinforced fiber matrix may include one of a bamboo fiber matrix, a cotton fiber matrix, a polyester fiber matrix, a nylon fiber matrix, or a wool fiber matrix. The resin substrate may include a first portion of iron oxide particles and a second portion of the elastic polymer solution, the first portion of iron oxide particles being based at least in part on an RF signal range that the textile article is configured to absorb and attenuate. For example, the iron oxide particles may include Fe.sub.3O.sub.4Fe, Fe.sub.3O.sub.4Ni, or Fe.sub.3O.sub.4, and/or so forth.

A method for controlling dielectric constant of a composite material through micro pattern printing includes setting a dielectric constant value needed in the composite material, preparing a paste having an electromagnetic loss material, fabricating a composite material sheet by forming the paste on one surface of a base member in a predetermined pattern, and fabricating the composite material sheet with the micro patterns including the electromagnetic loss material on the base member by drying the composite material sheet, wherein the base member is formed of a sheet and includes fibers.

The present invention discloses a reconfigurable wideband phase-switched screen (PSS) based on an artificial magnetic conductor (AMC). Gap capacitance between patches is controlled by changing the capacitance of varactors, so that periodic units have a plurality of continuous frequency points. A phase difference between two adjacent frequency bands is 143°-217°, so that the periodic structure absorbs incident electromagnetic waves in a wide frequency band, and the broadband PSS is implemented with a relative bandwidth of 45.2%. The AMC structure according to the present invention is simple in structure and easy to process, with a thickness less than one twentieth of the working wavelength, and greatly reduces size and costs.

An impedance matching film 10a has a plurality of openings 11. The plurality of openings 11 are formed at equal intervals in a specific direction along main surfaces 10f of the impedance matching film 10a. The impedance matching film 10a has a sheet resistance of 300 to 700Ω/□. A size G of each opening 11 in the specific direction is 50 μm or more and 1000 μm or less. In the impedance matching film 10a, a cross-sectional resistance value R.sub.s is 1MΩ/m or more. The cross-sectional resistance value R.sub.s is determined by dividing a specific resistance of a material forming the impedance matching film 10a by a product of a thickness of the impedance matching film 10a and a distance between the nearest openings 11.

According to one embodiment, an electromagnetic wave attenuator includes a stacked member. The stacked member includes a base body including a first surface including unevenness, a first conductive member including Cu, and a first layer provided between the first surface and the first conductive member. The first layer includes Cr and Ti.

The present invention relates to a mechanical meta-material based electromagnetic wave absorber, wherein a shape of the electromagnetic wave absorber is any one of a kelvin-foam, an octet-truss, a body-centered cubic lattice, a simple cubic triply minimal surface (SC-TPMS), and a cubic cellular core (CCC) and a honeycomb, a dielectric loss of the electromagnetic wave absorber is controlled by changing a strut diameter of a unit cell including at least one of carbon black, carbon nanotube, carbon fiber and graphene constituting the electromagnetic wave absorber.