A radiation-shielding attenuation structure and method of forming the attenuation structure, wherein the attenuation structure is made by additively manufacturing a concrete material that includes one or more attenuation dopants configured to enhance the radiation shielding of the concrete material. The one or more attenuation dopants may be configured in the concrete material to attenuate one or more types of radiation, such as electromagnetic radiation, gamma radiation, X-ray radiation, or neutron radiation. The attenuation structure formed by the concrete material may be additively manufactured on-site according to a model that has already been pre-certified for safe or secure use, thereby providing a repeatable and reproducible process that can reduce lead times and fabrication costs. The attenuation structure may be easily modified during the additive manufacturing process to have different concrete mixtures with different attenuation characteristics, which increases the tailorability and flexibility in design of the attenuation structure.

Embodiments of the present invention relate to electromagnetic interference (EMI) shielding structures. Rectangular EMI shielding panels are formed that include a first and second ends. A pair of rectangular EMI shielding panels are affixed orthogonal to each other at their first ends. The pair of rectangular EMI shielding panels are successively overlapped with each other to thereby form a plurality of interconnected EMI shielding planes. The pair of rectangular EMI shielding panels are affixed to each other at their second ends to form a helical EMI shielding structure that unfolds to an unfolded state and folds to a folded state along its center axis. Here, the plurality of interconnected EMI shielding planes are each angularly offset from each other about the center axis to form a helical structure when in the unfolded state. The EMI shielding panels include an encapsulating layer and/or metallic layer.

A board includes a first magnetic conductive plate and a second magnetic conductive plate. The first magnetic conductive plate has a first magnetic conductive direction. The second magnetic conductive plate overlaps with the first magnetic conductive plate. The second magnetic conductive plate has a second magnetic conductive direction. The first magnetic conductive direction and the second magnetic conductive direction cross.

An electromagnetic wave absorber and an electromagnetic wave anechoic room using the absorbers. The electromagnetic wave absorber has improved electromagnetic wave absorption characteristics at high frequencies in spite of having a hollow structure. The electromagnetic wave absorber includes a hollow shell with a bottom that is a rectangle. A part of a surface of the hollow shell and an outer face of a planar extension lie in planes that are not parallel to any side of the rectangle. At least the plane that is not parallel to any side of the rectangle is included in a surface of an electromagnetic wave absorption member.

A radio frequency shield door system is provided. The radio frequency shield door system provides an effective RF and electromagnetic seal between a door and the perimeter of the doorway through a continuous interface of conductive or magnetic material between peripheral sealing surface of the door and a perimeter frame of the doorway. The perimeter frame may provide spring-loaded contact rails electrically or magnetically coupled thereto so that when the door is in a closed configuration a RF seal is formed between the interfacing sealing surface and contract rails, yet the door is still readably between an open configuration and closed configuration.

An external electromagnetic shielding device is provided. The external electromagnetic shielding device includes a bottom shield, a conductive cover being in a grid-like shape and arranged above the bottom shield, and a rolling module. The conductive cover includes a top shield spaced apart from the bottom shield, a lateral shield connected to the top shield, and a plurality of supports that are fixed to the lateral shield. The supports include a bottom support in an annular arrangement, and any two of the supports are spaced apart from each other. The rolling module includes a rolling unit and a linkage unit that is connected to the rolling unit and the bottom support. When the linkage unit is coiled on or released from the rolling unit, the bottom support can be moved to allow the lateral shield to fold or unfold between the bottom shield and the top shield.

A lightweight transportable containerized shelter includes wall panels made of a non-metal composite material coated at least on its inner face with a metal layer for EMI protection. The several wall panels are secured to a metal structural frame without the use of fasteners so as to define a containerized transportable shelter. The shelter meets ISO standards 668 and 1496. The shelter provides a continuous barrier to electromagnetic signals. Moreover, the containerized shelter is amenable to nine high stacking as required for ISO certification.

A method according to one embodiment includes securing a first plurality of conductive sheets to a surface, applying a conductive tape to a first plurality of joints between conductive sheets of the first plurality of conductive sheets, and securing a second plurality of conductive sheets to the first plurality of conductive sheets without fully penetrating the first plurality of conductive sheets. In such an embodiment, each of a second plurality of joints between conductive sheets of the second plurality of conductive sheets is offset relative to the first plurality of joints.

A protective housing for shielding against electro-magnetic field (EMF) radiation includes a conductive mesh, a frame coupled to the conductive mesh and configured to define a shape of the conductive mesh, and a frame cover coupled to the frame and the conductive mesh, the frame cover including a main body coupled to the frame, a first swivel portion rotatably coupled to a first end of the main body, and a second swivel portion rotatably coupled to a second end of the main body, the first and second swivel portions corresponding to an entry of the protective housing.

Electromagnetically shielding an enclosable structure having a floor, walls, a ceiling, and at least one closeable opening by applying a shielding wallcovering to at least a portion of one of the walls and applying a second type of shielding material to at least a portion of the enclosable structure, wherein the second type of shielding material differs from the shielding wallcovering. The shielding wall covering is wallpaper comprising a metal-coated broad good and a resin. Other types of shielding material may include a transparent, shielding window covering such as NiCVD coated screen of woven silk fibers; shielded flooring such as a layered combinations of Kevlar non-woven as a base layer, nickel-coated non-woven layers, and a PCF toughened polymer; and a transition shielding strip made of a base layer of the shielding wallpaper with a PCF toughened polymer coating over a portion of the strip.