An aspect of the present invention provides an electromagnetic wave absorption film that is less susceptible to the surrounding environment. An electromagnetic wave absorption film 10 has: a planar base 20; a first electromagnetic wave absorption pattern 1 formed on the base 20; a second electromagnetic wave absorption pattern 2 formed on the base 20; and a third electromagnetic wave absorption pattern 3 formed on the base 20, wherein when A [GHz] is defined as a frequency at which an absorption amount of an electromagnetic wave absorbed by the first electromagnetic wave absorption pattern 1 exhibits its local maximum value in a range from 20 to 110 GHz, B [GHz] satisfies Expression (1), B [GHz] being the value of a frequency at which an absorption amount of an electromagnetic wave absorbed by the second electromagnetic wave absorption pattern 2 exhibits its local maximum value, and C [GHz] satisfies Expression (2), C [GHz] being the value of a frequency at which an absorption amount of an electromagnetic wave absorbed by the third electromagnetic wave absorption pattern 3 exhibits its local maximum value,
1.037×A≤B≤1.30×A  Expression (1)
0.60×A≤C≤0.963×A  Expression (2).

For example, a system may include a radome to be attached to a vehicle bumper fascia; an antenna array on a Printed Circuit Board (PCB), the antenna array is between the PCB and the radome, the antenna array comprising a Transmit (Tx) antenna configured to transmit Tx radar signals via the radome and the vehicle bumper fascia, and a receive (Rx) antenna configured to receive Rx radar signals based on the Tx radar signals; and an absorbing spacer in a spacer area between the PCB and the radome, the spacer area separating the Tx antenna from the Rx antenna, the absorbing spacer configured to absorb reflected signals formed by reflection of the Tx radar signals from the vehicle bumper fascia.

Disclosed is a radio-wave-transmissive cover of a vehicle radar, which exhibits a metallic color and is imparted with improved radio-wave transmission performance. The radio-wave-transmissive cover may include an optical film formed by simultaneously depositing an aluminum (Al) material and a low-melting-point material, such that a radio wave radiated from an antenna of a radar, for example, provided in a vehicle is transmitted. The radio-wave-transmissive cover includes a substrate, and an optical film including aluminum (Al) and a low-melting-point metal having a melting point less than the melting point of aluminum (Al) on the surface of the substrate.

In a meta-structure having multifunctional properties according to an exemplary embodiment of the present invention, a plurality of unit blocks controlling a property of a wave is combined on a plane or in a space in a predetermined pattern to form one structure, at least one of the plurality of unit blocks is formed to have a different size, and a frequency range of a wave controlled is changed according to the size of the unit block.

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.

An electronic device is provided. The electronic device includes a housing including a front surface plate, a rear surface plate, and a side surface portion providing a side surface, a first support positioned between the front surface plate and the rear surface plate and connected to the side surface portion, a display, a wireless communication circuit configured to transmit or receive a signal through an antenna radiator, camera circuitry positioned between the first support and the rear surface plate, and a conductive pattern positioned between the first support and the rear surface plate and at least partially overlapping with the camera circuitry when viewed from a top of the rear surface plate, and electrically connected to a ground of the electronic device, some electromagnetic waves, which travel toward the camera circuitry, among electromagnetic waves radiating from the antenna radiator, flow to the ground through the conductive pattern.

An electromagnetic energy absorber comprising a thin electrically-conductive ground plane as a base. Dielectric layers are positioned over the ground plane and high impedance surface (HIS) as a top layer. The impedance layer can be formed by loading the lumped resistor to a metallic grating like an FSS (Frequency Selective Surface). An air-spacer between the substrates has replaced the problem of the large electrical thickness of the substrate with effective permittivity. Metamaterial structures enable control over the resonant frequencies, and performance is enhanced over a broad frequency band. In addition, two broadband reflective-type linear to orthogonal polarization converters are disclosed that provide improved bandwidth and angular stability performance.

A wellbore servicing tool. The wellbore servicing tool comprises a tool body, an electromagnetic transmitter coupled to the tool body, an electromagnetic receiver coupled to the tool body and spaced apart from the electromagnetic transmitter, wherein a portion of the tool body between the electromagnetic transmitter and the electromagnetic receiver defines a direct signal path between the electromagnetic transmitter and the electromagnetic receiver, and an absorbing material coupled to the tool body in the direct signal path between the electromagnetic transmitter and the electromagnetic receiver, proximate to the electromagnetic receiver.

A method includes obtaining a base housing for electronic components. The base housing attenuates radiation entering the base housing by a base amount. An inner volume of the base housing defined by an inner surface of the base housing experiences attenuated radiation. The method also includes affixing one or more inserts to the inner surface of the base housing to further attenuate the attenuated radiation in corresponding one or more areas of the inner volume.

Disclosed is an absorbent structure which is a honeycomb structure extending between two end faces and which includes tubular cells, each cell having walls delimiting the cell, the walls extending between the two end faces, the walls being formed from a dielectric material, at least one cell having at least one strip of electrically conductive coating arranged in at least one wall or over a surface of at least one wall, the honeycomb structure being characterized by parameters chosen so that the absorbent structure provides an attenuation of at least 10 dB for each incident wave in a frequency range having a frequency spread greater than or equal to 15 GHz.