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.

The present invention aims to provide a /4 type radio wave absorber having excellent durability. Provided is a /4 type radio wave absorber including: a resistive film containing molybdenum; a resistive film; a dielectric layer; and a reflective layer, in the stated order.

The present invention relates to an electromagnetic millimetre wave absorber material, preferably having a volume resistivity of more than 1 cm, containing solid particles having an aspect ratio (length:diameter) of at least 5 of a first electrically conductive material, particles having an aspect ratio (length:diameter) of less than 5 of a second electrically conductive material and an electrically non-conductive polymer, wherein the absorber material is preferably capable of absorbing electromagnetic waves in a frequency region of 60 GHz to 200 GHz and wherein the electromagnetic millimetre wave absorber material comprises based on the total amount of the absorber material from 30 wt.-% to 93 wt.-% of the electrically non-conductive polymer, from 6.5 wt.-% to 10 wt.-% of the first electrically conductive material, from 0.5 wt.-% to 0.9 wt.-% of the second electrically conductive material, and from 0 wt.-% to 59.1 wt.-% of one or more additives. The invention also relates to its use and method for absorbing as well as a sensor apparatus comprising said absorber material.

Included are: a radar main unit for emitting a radar wave and receiving a reflection wave of the radar wave reflected by an object; and a dielectric substrate in which multiple matching layers each having a protruded shape are regularly arranged on one surface of the dielectric substrate, and the radar wave emitted from the radar main unit enters the multiple matching layers in a state where the other-surface side of the dielectric substrate is attached to a windshield.

A configurable radio frequency device includes a surface and a plurality of configurable radio frequency elements disposed on the surface. The radio frequency elements can be configured to absorb, reflect, or pass a radio transmission. A controller is configured to control the configuration of the surface by setting the state of the radio frequency elements. The controller also determines a deployment configuration for the surface by applying a series of test configurations to the surface and receiving a measurement of signal quality as measured by a receiver. The controller can then use these measurements to determine how to set the states of the radio frequency elements for the deployment configuration.

The disclosure discloses a controllable wave-absorbing metamaterial including a substrate and a metamaterial unit array layer. Each conductive geometric unit includes a first hollow structure, second hollow structures, and conductive geometric structures. The second hollow structures are respectively extended from four vertices of the first hollow structure, and the conductive geometric structure is disposed between each two adjacent second hollow structures. The first end of the second hollow structure is provided with a varactor diode connected to the conductive geometric structures at both sides, the second end of the second hollow structure is provided with a fixed capacitor and a fixed resistor; the fixed capacitor is connected to the conductive geometric structure at one side, and the fixed resistor is connected to the conductive geometric structure at the other side. Therefore, active adjustment on a wave-absorption frequency band can be implemented, and power consumption is very low.

An absorption sheet for absorbing power from an electromagnetic wave generated by a device under test includes a substrate and an array of absorption elements. Each absorption element includes a conductive portion and a resistive portion. A system for performing a radiation characterization includes the absorption sheet. A method of measuring a radiative near field of a device under test and a method of characterizing a radiative near field of a device under test are also disclosed.

Provided is a radio wave absorber including: a support; a first radio wave absorption layer having a flat plate shape that is disposed on a surface of the support and includes a radio wave absorption material and a binder; and second radio wave absorption layers that are erected on a surface of the first radio wave absorption layer, include a radio wave absorption material and a binder, and are conical protrusions having bottom surfaces of which outer peripheral portions are in contact with each other, in which a distance between apexes of the conical protrusions adjacent to each other is 0.5 mm to .sup.a mm, in a case where a wavelength of a radio wave to be absorbed is set as .sup.a mm, and a manufacturing method of a radio wave absorber.

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.

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 is constructed to prevent radar waves from entering into the soft body system.