A method for repairing a damaged area of a stealth composite structure having a stealth function using a scarf patch includes the steps of diagnosing the damaged area; deriving a repair area including the diagnosed damaged area; processing the scarf patch according to the derived repair area; machining a patch hole according to the derived repair area to remove the damaged area; and coupling the scarf patch to the patch hole so that an inner wall of the patch hole and a side surface of the scarf patch face.

The disclosure discloses a wide-frequency wave-absorbing metamaterial, which comprises a plurality of layers of substrates and microstructures respectively arranged on the substrates at different layers. The wave-absorbing frequency band of the wide-frequency wave-absorbing metamaterial is relatively wide. The disclosure further discloses an electronic device and a method for obtaining a wide-frequency wave-absorbing metamaterial. By using the foregoing manner, the disclosure can enable a wave-absorbing metamaterial to significantly increase a wave-absorbing bandwidth based on a relatively good electromagnetic wave absorbing effect.

The disclosure discloses a wide-frequency wave-absorbing metamaterial, which comprises a plurality of layers of substrates and microstructures respectively arranged on the substrates at different layers. The wave-absorbing frequency band of the wide-frequency wave-absorbing metamaterial is relatively wide. The disclosure further discloses an electronic device and a method for obtaining a wide-frequency wave-absorbing metamaterial. By using the foregoing manner, the disclosure can enable a wave-absorbing metamaterial to significantly increase a wave-absorbing bandwidth based on a relatively good electromagnetic wave absorbing effect.

Provided are an electromagnetic wave absorbing sheet which is a thin film and a low cost and has an excellent electromagnetic wave absorbing rate, a method of manufacturing the same, and an electronic device using the same. The electromagnetic wave absorbing sheet includes: at least one layer thin-film magnetic sheet which is separated into a plurality of fine pieces; a protective film that is adhered on one surface of the thin-film magnetic sheet; and a double-sided tape that is adhered on the other surface of the thin-film magnetic sheet.

Provided are an electromagnetic wave absorbing sheet which is a thin film and a low cost and has an excellent electromagnetic wave absorbing rate, a method of manufacturing the same, and an electronic device using the same. The electromagnetic wave absorbing sheet includes: at least one layer thin-film magnetic sheet which is separated into a plurality of fine pieces; a protective film that is adhered on one surface of the thin-film magnetic sheet; and a double-sided tape that is adhered on the other surface of the thin-film magnetic sheet.

A read chamber device disclosed for use within a radio frequency identification (RFID) scanning enclosure which provides a means of reading a plurality of cartons moving through the enclosure via a conveyor belt. The enclosure is positioned over a section of the conveyor belt, such that the plurality of cartons on the conveyor belt pass directly through the enclosure. The read chamber device that may be positioned centrally to the enclosure and projects a read zone via an antenna positioned centrally within the read chamber device. The read chamber device provides for tuning the read zone via a movable metal plate comprising absorber material components secured to it, that is positioned at variable distances to partially or fully cover the read zone. The metal plate is moved into the read zone to obstruct a percentage of radio frequency energy from escaping the read zone, and thus narrowing the total read field.

A read chamber device disclosed for use within a radio frequency identification (RFID) scanning enclosure which provides a means of reading a plurality of cartons moving through the enclosure via a conveyor belt. The enclosure is positioned over a section of the conveyor belt, such that the plurality of cartons on the conveyor belt pass directly through the enclosure. The read chamber device that may be positioned centrally to the enclosure and projects a read zone via an antenna positioned centrally within the read chamber device. The read chamber device provides for tuning the read zone via a movable metal plate comprising absorber material components secured to it, that is positioned at variable distances to partially or fully cover the read zone. The metal plate is moved into the read zone to obstruct a percentage of radio frequency energy from escaping the read zone, and thus narrowing the total read field.

In one embodiment, an antenna system includes a device for attenuating undesirable radiation from an antenna. The device includes a perimeter plate adapted to be located around the perimeter of the antenna. The perimeter plate has one or more concentric perimeter bands, where each perimeter band comprises an array of distinct EM-field-suppressing features. The surface of each suppressing features is metallic. The dimensions, arrangement, and number of the suppressing features are such that the features form a meta-material and the perimeter plate attenuates back-lobe and/or side-lobe radiation generated by the antenna.

A wavelength selective structure for selectively reflecting or absorbing incident electromagnetic visible or infrared radiation. The wavelength selective structure includes a wavelength selective structure with a plurality of layers, including a compound layer forming a plurality of surface elements, an electrically isolating intermediate layer, wherein the compound layer is in contact with a first surface of the electrically isolating intermediate layer, and a continuous electrically conductive layer in contact with a second surface of the electrically isolating intermediate layer. The compound layer includes at least one metallic layer and at least one dielectric layer. The selective surface has at least one resonance band for selectively reflecting or absorbing visible or infrared radiation based on a resonant electromagnetic coupling between the plurality of surface elements and the continuous electrically conductive layer.

A wavelength selective structure for selectively reflecting or absorbing incident electromagnetic visible or infrared radiation. The wavelength selective structure includes a wavelength selective structure with a plurality of layers, including a compound layer forming a plurality of surface elements, an electrically isolating intermediate layer, wherein the compound layer is in contact with a first surface of the electrically isolating intermediate layer, and a continuous electrically conductive layer in contact with a second surface of the electrically isolating intermediate layer. The compound layer includes at least one metallic layer and at least one dielectric layer. The selective surface has at least one resonance band for selectively reflecting or absorbing visible or infrared radiation based on a resonant electromagnetic coupling between the plurality of surface elements and the continuous electrically conductive layer.