RU2345512C2 - Portable shielded chamber - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: invention relates to electrical engineering and particularly portable shielded chamber design The invention may be used in research activities for assessing electromagnetic interference of different radio and electronic instruments. The side walls, top and bottom of the portable chamber are manufactured from current-conducting multi-layer corrugated material of "polymer film - current-conductive coating" type allowing for chamber stretching, compressing and smooth bending during installation at the working place. The content of multi-layer "polymer film - current-conductive coating"-Type material includes tape-like fragments absorbing electromagnetic radiation. The tape is manufactured from amorphous magnetic material.

EFFECT: reduction of chamber weight and cost, improvement of operation easiness due to avoidance of assembling and dissembling operations during chamber transportation from one room to another, preservation of required values of shielding effectiveness.

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Description

The invention relates to radio engineering and can be used to conduct research in the field of electromagnetic compatibility (EMC) of electronic devices (RES) for various purposes.

Known shielded cameras (EC) designed to protect the RES, studied by EMC parameters, from the effects of external electromagnetic fields and waves, as well as to protect the RES, designed to transmit, receive and process confidential information from leakage by electromagnetic radiation [1-2 ].

The closest in technical essence is a collapsible shielded camera (EC) integrated into the working room [3] (prototype of the invention), the side walls, floor and ceiling of which are made of conductive material in the form of a combination of flat plates (modules), which assembly, ECs are connected to each other by welded or glue seams, or bolted joints.

The disadvantages of the prototype are significant weight and high cost (the price of 1 m ^{2 of the} screen of a modular EC is 180-225 US dollars, when using facing materials based on cardboard - 90 US dollars) [3], as well as the complexity of the process of disassembling and assembling the EC when moving it from one workroom to another. At the same time, the main working parameter of the EC: the screening efficiency (EE) of the prototype is in some cases unnecessarily large and significantly exceeds the practically necessary values - for example, when testing RES according to the EMC parameters in the field, where the level of external interference by EMR is significantly less than in the city.

The technical result of the invention is to reduce weight and cost, increase ease of use by eliminating the processes of disassembly and assembly of the shielded camera when moving it from one room to another, the ability to change the shape and configuration of the shielded camera in accordance with the production need (depending on overall dimensions the investigated electronic means, the area of the room, the number of jobs inside the shielded camera, etc.) while maintaining the required values of e screening efficiencies.

The technical result is achieved due to the fact that the side walls, floor and ceiling of the portable shielded chamber are made of conductive material in the form of corrugated surfaces of multilayer material of the type "polymer film - conductive coating", allowing tension, compression and smooth bending when installed in the workplace.

The composition of the multilayer material of the type "polymer film - conductive coating" introduced absorbing fragments in the form of a tape of an amorphous soft magnetic alloy.

Figure 1 shows the appearance of a collapsible portable shielded camera of modular design (prototype of the invention) [3].

Figure 2 in two views: front (Figure 2A) and top (Figure 26) shows a portable shielded camera of the proposed design, made of corrugated multilayer material of the type "polymer film - conductive coating".

The portable shielded chamber of the proposed design contains side walls 1, floor 2 and ceiling 3, which are made of corrugated multilayer material of the type "polymer film - conductive coating".

The technical essence of the invention consists (see Figure 2) in that, due to the proposed design of a portable shielded camera (EC) in the form of an "accordion" (side walls 1, floor 2 and ceiling 3 are made of corrugated multilayer material of the type "polymer film - conductive coating ”), which allows both an increase (by stretching the corrugation) and a decrease (compression of the corrugation) of the longitudinal dimensions of the EC, as well as smooth bending of the corrugation without affecting the efficiency of shielding (EE) of the camera, you can change the shape and configuration of the EC in the ah. When moving the EC from one working room to another, the corrugation in the longitudinal direction is compressed to the minimum acceptable limit, after which the EC is transported. At the new workplace, the EC is installed taking into account production needs - by stretching and bending the corrugation in the right direction. There is no need to disassemble the EC at the old place and assemble the EC at the new workplace.

The required EE values are ensured by the use of a multilayer material of the type “polymer film - conductive coating” in the EC design, the reflecting and absorbing properties of which depend on the number of layers and the properties of the coating (layer deposited or chemically deposited conductor, metal foil). According to the value of EE at frequencies above 100 MHz, the EC of the proposed design, like the prototype, satisfies practical standards.

To expand the operating range of the EC due to lower frequencies, the composition of the multilayer material of the type "polymer film - conductive coating" includes absorbing electromagnetic energy fragments in the form of segments of tape 0.35 mm thick made of an amorphous soft magnetic alloy, the orientation of which is shown in Figure 2 dashed lines. These fragments do not impair the mechanical properties of the corrugation, but allow obtaining the required EE values at frequencies up to 10 kHz.

In addition to less weight and cost, the portable shielded camera of the proposed design compares favorably with the prototype with a significant improvement in ergonomic characteristics and ease of use while maintaining the required shielding efficiency.

LITERATURE

1. Grodnev I.I. Electromagnetic shielding in a wide range of frequencies. M .: Communication, 1972. - P.76.

2. Tsvetkov VV et al. Electronic warfare: radio intelligence and radio countermeasures. M .: Publishing. MAI, 1998 .-- S.99.

3. Kechiev L.N., Stepanov P.V. EMC and information security in telecommunication systems. M .: Publishing House "Technologies", 2005. - P.320.

Claims (1)

A portable shielded chamber for protection against electromagnetic radiation, the side walls, the floor and ceiling of which are made of conductive material, characterized in that the side walls, floor and ceiling of the shielded chamber are made in the form of corrugated surfaces of a multilayer material of the type “polymer film - conductive coating” that allow stretching, compression and smooth bending when installed in the workplace, while fragments absorbing electromagnetic radiation are introduced into the multilayer material s as a ribbon of an amorphous soft magnetic alloy.

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