Daewoochem

EMI / EMC & Stealth Material

EMI Shielding / Absorbing Material

Daewoo Chem's EMI shielding and absorbing materials are developed to address electromagnetic interference (EMI) in communication, automotive, aerospace, and defense environments. Verified shielding and absorption performance has been achieved across wide bands including X-Band and Ku-Band, with a reflection + absorption composite structure.

EMI Shielding EMI Absorber X-Band Ku-Band Stealth EMC

X-Band SE Verification Results

In S-Parameter based tests of our X-Band (8~13 GHz) reflection + absorption material, one side achieved stable shielding of 99.96%, while the opposite side achieved absorption rates of 85~99.4%.

99.96 % Stable shielding rate (one side, X-Band)

85 ~ 99.4 % Absorption rate (opposite side, X-Band)

3 mm Reference sample thickness

Key Verification Results

Thickness (mm)	Frequency (GHz)	Shielding (%)	Absorption (%)	Applications
3	0 ~ 1.5	99.68	-	EMI shielding for consumer electronics (laptop, smartphone, TV), inverters, and automotive applications
3	8 ~ 13	99.999999	-	Defense / intelligence communication rooms, server rooms, secure meeting rooms (anti-eavesdropping), stealth electronic equipment, X-Band radar protection, shielded chambers, high reliability / high security environments
3	8 ~ 13	-	90	General commercial communication modules, microwave transceivers
3	8.85 ~ 10	-	96.84	Military and civil aircraft radar, marine radar, weather radar, satellite communication components, high-frequency test equipment, R&D RF systems
3	9.44	-	99.684	X-Band radar systems, satellite communication equipment, precision RF communication equipment, precision test instruments

Application Fields

Antenna · Measurement General / high-performance antennas, precision measuring instruments

Aerospace · Satellite · Military Satellite comms, aircraft/military radar, high-resolution surveillance radar

Communication Infrastructure Microwave backhaul, satellite ground stations, phased array antennas, EMI suppression

Stealth · Radome Stealth structures, internal radome reflection reduction, and more

Key Conclusions

Low S21 (transmission) maintained across the entire high-frequency band

Reflection + absorption composite structure realized

Superior weight reduction / design flexibility versus conventional metal shielding

Applicable to communication RF modules, automotive electronics, military radar protection equipment

This indicates that the material provides superior interference suppression performance in real-world environments compared to simple metal shielding materials.

Ku-Band Absorber Performance

Achieved RL -27 dB with 99.8% absorption at 17.7 GHz; an additional high-performance sample reached RL -40.5 dB with 99.991% absorption at 11.5 GHz.

Standard Sample · 17.7 GHz RL -27 dB Absorption 99.8 %

High-Performance Sample · 11.5 GHz RL -40.5 dB Absorption 99.991 %

Application Fields

Applicable to satellite communication, aircraft radar, military surveillance radar, stealth structures, and more.

Wideband Coverage

Stable absorption and shielding performance across wide high-frequency bands, from X-Band (8~13 GHz) up to Ku-Band (12~18 GHz).

Keywords: EMI Shielding, EMI Absorber, X-Band, Ku-Band, Stealth, EMC