An apparatus for reducing interference in an antenna from a radio wave is provided. A method for blocking an electromagnetic wave signal port is used. A WiFi antenna is enclosed by using an electromagnetic wave blocking material (such as an aluminum metal mesh) to form an enclosure surrounding the WiFi antenna. The enclosure is provided with one or more electromagnetic wave signal ports, to form an electromagnetic wave selection enclosure (wave selection enclosure). When a wavelength satisfies a requirement, an electromagnetic wave having a signal with sufficient strength, or a signal in an appropriate direction with insufficient strength (for example, entering the signal port in a route closer to a linear route) is allowed to enter the enclosure and communicate with the antenna, reducing or eliminating mainly interference in the antenna in the enclosure from another co-frequency electromagnetic wave outside the enclosure.

A tile for reducing a radar wave reflection from a surface, the tile being a flexible surface sheet which is adhesively attachable to the surface, wherein the flexible surface sheet reduces the radar wave reflection from the surface at a frequency, the frequency being a frequency between 1 GHz and 12 GHz; and, wherein the flexible surface sheet is a laminate of layers, wherein at least one of a top surface and a bottom surface of the flexible surface sheet is adapted to be adhesively attachable to the surface, and wherein the laminate of layers comprises: a first layer comprising a polymer matrix into which a particulate filler is dispersed, wherein the particulate filler has radar absorbing properties; a second layer comprising a polymer matrix, the second layer adjoining the first layer, wherein the polymer matrix of at least one of the first and the second layer is thermoplastic polyurethane.

At least some embodiments of the present disclosure provide a roofing accessory that includes a radiofrequency radiation shielding non-woven fiber composite material. The radiofrequency shielding non-woven fiber composite material includes a first fiber type that includes a conductive material, where the radiofrequency shielding non-woven fiber composite material has a sufficient amount of the first fiber type so as to result, when the radiofrequency shielding non-woven fiber composite material is positioned on a roof structure, in the radiofrequency shielding non-woven fiber composite material allowing for shielding a predetermined percentage of electromagnetic radiation passing through the roof structure. The radiofrequency shielding non-woven fiber composite material includes a second fiber type that includes a non-conductive material. The first fiber type and the second fiber type are randomly dispersed within the radiofrequency shielding non-woven fiber composite.

A radar-absorbing fiber-reinforced structure includes a fiber composite discharging part. The fiber composite discharging part includes a first electrode part and a second electrode part, which are spaced apart from each other by a dielectric layer and receive different voltages. The fiber composite discharging part is configured to discharge plasma in response to a voltage difference thereby changing a reflected wave or transmitted wave of a radar incident on the radar-absorbing fiber-reinforced structure to reduce reflectivity of the radar. At least one of the first electrode part and the second electrode part include a conductive fiber having a tensile strength equal to or more than 0.5 GPa.

The present invention relates to a multipurpose shielding or attenuating fabric for blocking up to 99.9% of an electromagnetic field (EMF) and RFID radiating from 5G and other cellular towers. The fabric can be used in strollers, pet carriers, umbrellas, and other devices for protecting from 5G radiation. The fabric can also include an integrated 5G detection chip for detecting 5G radiation impinging on the fabric. The fabric includes shielding particles woven into the fabric for shielding from 5G radiation. The fabric, configured into various device embodiments, protects adults, children, and pets from the harmful effects of 5G radiation and eliminates the need to keep a child or pet indoors.

An RFID reading enclosure having a Faraday cage including a cage floor and a cage hood hinged to the cage floor. The cage hood includes a RF blocking fabric formed on a frame with the interior of the Faraday cage having a volume between 4.5 and 30 ft.sup.3. There are at least two RFID antennas positioned to transmit signals into the Faraday cage, with the two RFID antennas having a transmission axis along different orientations.

A capacitive stealth composite structure includes a plurality of structural layers stacked in a thickness direction, and the number of layers of the structural layers is three or more, wherein each of the structural layers consists of a plurality of electromagnetic wave absorbing patterns and a plurality of insulation patterns alternately arranged in a horizontal direction. The electromagnetic wave absorbing patterns in each of the structural layers are aligned with the insulation patterns of an adjacent structural layer, and the insulation patterns in each of the structural layers are aligned with the electromagnetic wave absorbing patterns of an adjacent structural layer.

The invention relates to a pocket for a garment, in particular to a pocket comprising a rear side configured to be turned towards the body of a person and a front side which is connected to the rear side and configured to face away from the body of a person. The invention also relates to a garment provided with at least one pocket according to the invention.

This disclosure provides systems, methods, and devices related to a metasurface skin cloak. In one aspect, a metasurface skin cloak includes a dielectric layer and a plurality of blocks disposed on the dielectric layer. The dielectric layer is disposed over a surface including a feature on the surface. Each block of the plurality of blocks has a shape that is symmetric about two perpendicular axes. The metasurface skin can render the feature on the surface not optically detectable.

Provided are systems and methods for cloaking an object on a ground plane. A thin dielectric metasurface is used to reshape the wavefronts distorted by the object in order to mimic the reflection pattern of a flat ground plane. To achieve such carpet cloaking, the reflection angle is made equal to the incident angle everywhere on the object by providing a graded metasurface with a designed phase gradient. This provides additional phase to the wavefronts to compensate for the phase difference amongst lightpaths induced by the geometrical distortion. One exemplary metasurface is described which is designed for the microwave range using highly sub-wavelength dielectric resonators. The approach can be applied to hide any scatterer under a metasurface of class C1 (first derivative continuous) on a groundplane not only in the microwave regime, but also at other frequencies, including higher frequencies, up to the visible.