Belarusian State University of Informatics and Radioelectronics

Information Security Department

Lab of Advanced Materials and Elementsfor Electronics and Superconductive Electronics

Technologies for wideband electromagnetic shields and absorbers

Knitted technology for electromagnetic shields and absorbers, including:

usage of microwire; knitted fabrics metallization by vacuum deposition; nanosize metal particles deposition on a developed surface of

porous materials (organic and inorganic) by electroless deposition;

liquid-containing composite materials forming; Composite material using powder conductive and dielectric

fillers; Designing the wideband electromagnetic shields and

radioabsorbers based on the developed composite materials.

Knitted technology for electromagnetic shields and absorbers Technology offers formation of

4 m wide knitted linen with both plain surface and geometrical non uniformity that can be formed in single technological step.

High throughout; Flexibility; Dimensional stability; High durability; Air penetration; Obtaining different shape items.

Technology with nanosize metallic particles incorporated into flexible polymer matrix The technology is based on

reaction of chemical sorption and electroless deposition that enables formation of nanosize metallic clusters within flexible polymer matrix.

Crystallites size 5–100 nm Materials resistivity: Ni 2.5·10–3 Ω·cm; Co 5·10–2 Ω·cm.

Liquid incorporation in threads and fibers

While material forming micro- and nanosized liquid particles of complicated shape are obtained

Application

Land object masking; Protection against intensive electromagnetic pulse

exposure; Protection against electromagnetic terrorism; Information security; Electromagnetic compatibility; Electromagnetic measurements; Radioecology.

Frequency analysisof signal reflected off the target

Scattering cross-section 50 m2; Target range 100 m; Decrease of radar target detection range up to 5 times.

Optical methods of target detection

Spectral-polarization propertiesof liquid-containing materials

Spectral-polarization properties of optical and radio ranges absorber adapted for sandy backgrounds

Protective means for object masking against the vegetation background in optical and radio ranges of EMR

Protective means for object masking against the sandy background in optical and radio ranges of EMR

Thermal contrast of the target covered by absorber in the medium IR (3-5 m) range

Target distance, 10 m; Air temperature, –10°С; Thermal contrast of masked target 0.32; Thermal perceptibility decrease, times 2.8

Thermal picture of non-masked target Thermal picture of masked target

Thermal contrast of the target covered by absorber in the far IR (8-12 m) range

Target distance 2 m; Ambient air temperature, 20°С; Surface temperature of heated target, 100°С; Material surface temperature, 25°С; Thermal contrast of masked target 0.25; Thermal perceptibility decrease, times 4

Demonstrationof thermal masking system operation

Demonstration of thermal masking system operation (VMADS)

Operating frequency 95 GHz Human skin heating time 2 s Skin surface heating temperature 45°С Penetration depth to 1 mm

Protection against intensive electromagnetic pulse exposure

Radiation parameters Radiated power 20 kW, Pulse duration 400 ns, Repetition period 50 Hz, Pulse stuffing frequency 37 GHz.

Materials characteristics Max thickness (sine cover) 3 mm, Attenuation – not lower than 20 dB.

Electromagnetic compatibility and measurements

Radioelectronic equipment including on-board systems (shielding of interference of elements and devices);

Antennas (blends and shields to decrease lateral radiation, decrease of interference);

Measurement systems (antenna grounds, mobile anechoic chambers).

Protective materials application for blocking of illegal access to electronic devices

Electronic passport data reading procedure

Normal mode Procedure blocked by applying EMR absorber

Protection of human organism against technical means’ EMR

Protection of radio communication users including mobile phones protection;

Protection of personal computers users, consumer radioelectronics users;

Protection of service personnel of radio engineering systems.

Protection of PC users

General parameters Operating frequency range 30–1000 MHz, EMR attenuation 20–30 dB, Operating temperature range –30…+70°C.

Comfort Flexible air-permeable vest

capable to attenuate EMR.Can be used to protect PC users. External grounding application is not required.

Protection of PC users

General parameters Operating frequency range 100–1000 MHz, EMR attenuation 8–30 dB, Operating temperature range –30…+70°C.

Compensator-M Optically transparent product

which prevents propagation of electromagnetic radiation from PC to user.

Developed materials application in human protection means

Simulation of spatial distribution of mobile phone EM field and its interaction with human head tissues with protective EM shield and without it

Application in human protection means

EM shielding protection means possess more than 30 dB effectiveness and about 10…25 % EM power reflection in the frequency range 1…150 GHz;

Perspectives of developed materials application in protection means for mobile phones users were analyzed mathematically;

Mobile phone radiated power is locally decreased by 500 times.

Mobile phone EMR indicator

General parameters Operating frequency range 200-2000 MHz, Operating temperature range –20…+40°C, Weight 250 g, Dimension 1609525 mm, USB interface 2.0.

Intended for estimation of electromagnetic radiation produced by mobile phone, fast check of EMR protection means efficiency.

Mobile phone EMR indicator

Mobile phone EMR indicator displays radiated power level in watts on embedded LCD monitor. It can be connected to a personal computer to display a radiation timing diagram and process the obtained data using special software.

Developed materials application in human protection means

Protected house development to provide information security both in acoustic and electromagnetic leakage paths

Protected house development

Advantages High acoustic signal suppression efficiency, avoid active

protective means utilization (noise generator); Optical transparency of designing materials; Mobility and fast assemblage ability; Low cost and small weight; Combined optically transparent panels for modular

protective houses to prevent information leakage by electromagnetic and acoustic paths.

Sound-insulating coefficient measuring equipment

Equipment structure 1 – metal pipe; 2 – LF generator Г3-118; 3 – power amplifier LV-103; 4 – loudspeaker; 5 – measurement microphone; 6 – sound-level meter ВШВ-003; 7 – experimental sample.

Optically transparent sound-absorbing cellular material

General parameters Operating frequency range 60–8000 Hz, Sound signal attenuation 7–31 dB, Operating temperature range –20…+50°C, Thickness 10 mm, Weight 1.7 kg/m2

Sound-insulating coefficient measurement results

1 – single-layered material; 2 – multi-layered material.

Protective house design to provide information security both in acoustic and electromagnetic leakage paths

The house has modular structure comprised of panels providing suppression of electromagnetic radiation and acoustic signals. Panels are transparent to observe the presence of a foreign man or object.

Our staff

Dr. Leonid Lynkov, Prof., research supervisor, Head of the Information Security DepartmentEmail: leonid@bsuir.by

Dr. Alexander Proudnik, Assoc. Prof., senior researcher,

Dr. Timofei Borbotko, Assoc. Prof., senior researcher,

Dr. Natalia Kolbun, Assoc. Prof., senior researcher

Contact information

220013Republic of BelarusMinskP. Brovka Str., 6Tel/fax: +375 17 2938939

Dr., Prof. Leonid Lynkov, Research supervisor of the Lab of Advanced Materials and Elements for Electronics and Superconductive Electronics,Head of the Information Security DepartmentEmail: leonid@bsuir.by