A system includes a light source, a receiver, and an enclosure. The light source is configured to emit an optical signal and the receiver is configured to detect a received optical signal including at least a portion of the emitted optical signal scattered by an external target. The enclosure includes a housing and a semiconductor window. The semiconductor window includes a semiconductor material configured to allow at least a portion of the emitted optical signal and the received optical signal to pass through the semiconductor window. The enclosure, including the housing and the semiconductor window, is configured to attenuate radio-frequency (RF) electromagnetic radiation.

Provided is an electromagnetic wave shielding film capable of easily adhering to an object, excellent in electrical connection stability, and excellent in transparency, shielding performance, and environmental resistance. The electromagnetic wave shielding film of the present invention has a first insulating layer, a transparent metal layer, a second insulating layer, and a conductive adhesive layer laminated in this order, in which a thickness of the second insulating layer is 10 to 500 nm, the conductive adhesive layer contains a binder component and spherical conductive particles, a median size of the spherical conductive particles is 3 to 50 μm, and a content ratio of the spherical conductive particles is 5 to 20 mass % with respect to 100 mass % of the conductive adhesive layer.

The device consists of a container manufactured from a metamaterial with the property of transparency to visible light, for the holding of electrical or electronic devices, which electromagnetically protects the same and renders them electromagnetically undetectable. The purpose of the device is to guarantee user confidentiality in the use of the electromagnetic waves associated with telecommunications, by means of the use of a type of container that encloses any type of telecommunication device or appliance, with the potentiality that the insertion thereof into said container prevents the detection by means of electromagnetic waves of said appliance, and therefore makes impossible the tracing of said appliance by electromagnetic remote sensing means, including mobile telephony, radiofrequencies, or satellite telecommunication means such as GPS, Galileo, or other systems, without it being necessary to switch off said appliance beforehand.

The present invention provides a transparent EMI shielding film that includes a first transparent polymeric substrate layer. A first conductive mesh layer having a first pattern is printed on the first layer, the conductive mesh having a line width from approximately 5 μm to approximately 500 μm and having a space between two adjacent conductive lines of 100 μm to 1000 μm. The conductive mesh blocks electromagnetic signals. A second transparent polymeric layer is positioned over the first transparent polymeric substrate layer having the first conductive mesh layer printed thereon. A second conductive mesh layer having a second pattern is printed on the second transparent polymeric layer, the second pattern being substantially identical to the first pattern, and being substantially identically positioned above the first pattern in order to maximize transparent spaces between adjacent conductive lines. The transparency is approximately 80% or greater in a visible light spectral region.

A microwave device includes a microwave cavity, a frame, and a window having an electrically insulating substrate and a structure of metallic wires supported by the substrate. The frame defines a perimeter of an opening in the microwave cavity and the frame is conductive and grounded. The window spans the opening and is arranged to reflect RF radiation back into the cavity and to shield the outside of the microwave cavity from RF radiation. The window is optically transparent. Each metallic wire of the structure is electrically connected to the frame and the width of each metallic wire is between 100 nanometres and 30 micrometres.

Provided is an electromagnetic-wave interference type electromagnetic-wave absorbing sheet that can favorably absorb electromagnetic waves in a desired frequency band while having high flexibility and light transmittance and being handled easily. The electromagnetic-wave absorbing sheet having flexibility and light transmittance includes an electric resistance film 1, a dielectric layer 2 and an electromagnetic-wave shielding layer 3 that each have light transmittance and that are stacked. The electric resistance film is formed of a conductive organic polymer, and the electromagnetic-wave shielding layer has an aperture ratio of 35% or more and 85% or less.

The present invention provides a transparent EMI shielding film that includes a first transparent polymeric substrate layer. A first conductive mesh layer having a first pattern is printed on the first layer, the conductive mesh having a line width from approximately 5 μm to approximately 500 μm and having a space between two adjacent conductive lines of 100 μm to 1000 μm. The conductive mesh blocks electromagnetic signals. A second transparent polymeric layer is positioned over the first transparent polymeric substrate layer having the first conductive mesh layer printed thereon. A second conductive mesh layer having a second pattern is printed on the second transparent polymeric layer, the second pattern being substantially identical to the first pattern, and being substantially identically positioned above the first pattern in order to maximize transparent spaces between adjacent conductive lines. The transparency is approximately 80% or greater in a visible light spectral region.

Provided is an electromagnetic wave shielding film capable of easily adhering to an object, excellent in electrical connection stability, and excellent in transparency, shielding performance, and environmental resistance. The electromagnetic wave shielding film of the present invention has a first insulating layer, a transparent metal layer, a second insulating layer, and a conductive adhesive layer laminated in this order, in which a thickness of the second insulating layer is 10 to 500 nm, the conductive adhesive layer contains a binder component and spherical conductive particles, a median size of the spherical conductive particles is 3 to 50 μm, and a content ratio of the spherical conductive particles is 5 to 20 mass % with respect to 100 mass % of the conductive adhesive layer.

An impedance matching film 10 includes a mixture containing indium oxide and tin oxide and being a main component of the impedance matching film, the mixture having an amorphous structure. The impedance matching film 10 for impedance matching has a Hall mobility of 5 cm.sup.2/(V.Math.s) or more. The impedance matching film 10 has a thickness of 16 nm or more and less than 100 nm.

An electromagnetic shielding member (11) includes a substrate (12) having a three-dimensional shape, and a conductive layer member (13) that is disposed on the substrate (12) and reflects an electromagnetic wave in a wavelength-selective manner.