At DMCRF, we provide the best RF absorber for RF Shield Room and EMC testing, designed to ensure accurate and reliable Antenna and EMC measurements.
RF Absorber and Microwave Absorber
RF Absorber Foam | RF Absorber Material
Contact DMCRF Shop for pricing and availability on Foam RF Absorber. Retrofit and anechoic chamber upgrade services and immediate scheduling available.
We specialize in high-quality RF Foam absorbers designed to effectively mitigate unwanted radio frequency signals, ensuring the integrity and accuracy of your electronic systems.
Our product line includes a wide range of RF Absorbers, from pyramidal and convoluted RF Absorber Foam to flexible magnetic sheets, suitable for anechoic chambers, RF shielding enclosures, and wireless test environments. Each product is engineered for superior absorption across a broad frequency spectrum.
Standard RF Absorber
DMC RF and Microwave Pyramidal Foam absorbers are made of carbon-impregnated low-density Polyurethane foam and come in various sizes and colors, Our PY-HY series absorbers provide excellent performance in normal incidence and off-angle incidence in Anechoic chamber with excellent impedance matching with Ferrite tiles and support wide frequency bands of operation up to 40 GHz..,
High-Performance Pyramidal Foam EMC Absorber
DMC series offers premium quality high power RF and Microwave Pyramidal Foam absorber, made of Polyurethane(PU) foam and are available in various size and color.
- Frequency range 30MHz to 40GHz
- Typical reflectivity as high as -35dB
- Power handling capacity 1.5kW/m2, 540 V/m CW Radiated field strength
- Fire Retardant per NRL-8093 1,2,3, UL 94 and DIN 4102-B2
- Continuous working temperature up-to 90°C
- RoHS Compliant
- Zero Carbon dust
Broadband High-Performance RF and Microwave Pyramidal Foam Absorber
DMC series offers premium quality Broadband high-performance RF and Microwave Pyramidal Foam absorber with heavy carbon-impregnated low-density Polyurethane foam to give better attenuation and performance.
- Frequency range 80MHz to 100GHz
- Typical reflectivity as high as -50dB
- Power handling capacity 1.5kW/m2,540 V/m CW Radiated field strength
- Fire Retardant per NRL-8093 1,2,3, UL 94 and DIN 4102-B2
- Continuous working temperature up-to 90°C
- RoHS Compliant
- Zero Carbon dust
Convoluted Microwave Absorber
DMC offers Polyurethane Convoluted Absorbers that are used in millimeter-wave test chambers and in areas where non-specular/ near field scattering signals are to be minimized.
- Frequency range 8GHz to 80GHz
- Typical reflectivity as high as -30dB
- Fire Retardant per NRL-8093 1,2,3, with Zero Halogen
- Continuous working temperature up-to 90°C
- RoHS Compliant
- Zero Carbon dust
High Performance Hybrid absorber
DMC offers premium quality high performance Expanded Polypropylene (EPP) absorbers made of the molding process and the State-of-the-art carbon synthesis process ensures extremely high uniformity of carbon powder density throughout the absorber.
High Performance Pyramidal Hybrid Absorber – Expanded Polypropylene (EPP)
DMC series of Ultra-premium high performance Polypropylene Hybrid Absorbers are made of molding process and the State-of-the-art carbon synthesis process ensures extremely high uniformity of carbon powder density throughout the absorber.
- Frequency range 30MHz to 40GHz
- Typical reflectivity as high as -49dB
- Plug and Pull install
- Power handling capacity 4.8kW/m2, 1353 V/m CW Radiated field strength
- Fire Retardant per NRL-8093 1,2,3, UL 94:2013, HBF and DIN 4102 and Class B2
- Continuous working temperature up-to 120°C
- Clean Room suitable per ISO 14644 Class5
- Water Resistant per GB/T 4208-2017
- RoHS and REACH Compliant
- Zero Carbon dust
Broadband High Performance Pyramidal Microwave Absorber – Expanded Polypropylene (EPP)
DMC series of Ultra-premium high performance Polypropylene Microwave Absorbers are made of molding process and State-of-the-art carbon synthesis process to ensure extremely high uniformity of carbon powder density throughout the absorber.
- Frequency range 80MHz to 100GHz
- Typical reflectivity as high as -60dB
- Plug and Pull install
- Power handling capacity 4.8kW/m2, 1353 V/m CW Radiated field strength
- Fire Retardant per NRL-8093 1,2,3, UL 94:2013, HBF and DIN 4102 and Class B2
- Continuous working temperature up-to 120°C
- Clean Room suitable per ISO 14644 Class5
- Water Resistant per GB/T 4208-2017
- RoHS and REACH Compliant
- Zero Carbon dust
Broadband Pyramidal High frequency mmW (Millimeter wave) EM Absorber – Expanded Polypropylene (EPP)
DMC series of Ultra-premium high performance Polypropylene mmW Absorbers are made of molding process and State-of-the-art carbon synthesis process to ensure extremely high uniformity of carbon powder density throughout the absorber
- Frequency range 1GHz to 80GHz
- Typical reflectivity as high as -50dB
- Plug and Pull install
- Power handling capacity 4.8kW/m2, 1353 V/m CW Radiated field strength
- Fire Retardant per NRL-8093 1,2,3, UL 94:2013, HBF and DIN 4102 and Class B2
- Continuous working temperature up-to 120°C
- Clean Room suitable per ISO 14644 Class5
- Water Resistant per GB/T 4208-2017
- RoHS and REACH Compliant
- Zero Carbon dust
High Performance Pyramidal Hybrid Absorber – Expanded Polystyrene (EPS)
DMC premium quality high performance Polystyrene Hybrid Absorbers are made of molding process and the State-of-the-art carbon synthesis process ensures extremely high uniformity of carbon powder density throughout the absorber
- Frequency range 30MHz to 40GHz
- Typical reflectivity as high as -42dB
- Plug and Pull install
- Power handling capacity 1kW/m2
- Fire retardant to UL94 HBF, DIN4102-B2, EN11925
- Continuous working temperature up-to 70°C
- Clean Room suitable per Class 10000/ ISO 14644-1 Class 4
- RoHS and REACH Compliant
- Zero Carbon dust
High Performance Pyramidal Microwave Absorber – Expanded Polystyrene (EPS)
DMC premium quality high performance Polystyrene Microwave Absorbers are made of molding process and the State-of-the-art carbon synthesis process ensures extremely high uniformity of carbon powder density throughout the absorber
- Frequency range 80MHz to 100GHz
- Typical reflectivity as high as -50dB
- Plug and Pull install
- Power handling capacity 1kW/m2
- Fire retardant to UL94 HBF, DIN4102-B2, EN11925
- Continuous working temperature up-to 70°C
- Clean Room suitable per Class 10000/ ISO 14644-1 Class 4
- RoHS and REACH Compliant
- Zero Carbon dust
High Power RF Microwave Foam Absorber
High performance flame retardant and high power RF foam absorbers are available from DMC. These absorbers are hollow broadband microwaves composed of heat-resistant non-woven fabric that has been soaked in microwave absorbing agent and flame retardant.
- Frequency range 30MHz to 100GHz
- Typical reflectivity as high as -50dB
- Power handling capacity 6kW/m2
- Fire Retardant per NRL-8093 1,2,3, UL 94 and DIN 4102-B2
- Continuous working temperature up-to 150°C
- RoHS Compliant
- Zero Carbon dust
High Temperature Handling RF and Microwave Absorber
DMC offers heat resistant rubber based RF absorbers handling temperature from 50°C to 150°C with broadband frequency range of operation from 1GHz to 40GHz. The pyramid structure and lossy material of the absorber provides excellent reflectivity performance at normal incidence and off angle incidence.
- Frequency range 1GHz to 40GHz
- Typical reflectivity as high as -35dB
- Power handling capacity 2kW/m2
- Water and UV resistant
- Fire Retardant per NRL-8093 1,2,3, UL 94 and DIN 4102-B2
- Continuous working temperature up-to 150°C
- RoHS Compliant
- Zero Carbon dust
High Power Handling RF and Microwave Absorber
DMC offers high power RF absorbers handling frequency range from 80MHz to 40GHz. The specially treated honeycomb material with pyramid structure provides broadband reflectivity performance in high power testing environment.
- Frequency range: 80 MHz to 40 GHz
- Light weight high-power handling material with hexagonal cell
- Power handling capacity up to 10 kW/m2
- Compliant with fire-retardancy (NRL 8093 Tests 1, 2, 3)
- ROHS and REACH compliant.
- Operating Temperature from -50ºC～+100ºC, Humidity range 40% -80%
- Product life under controlled environment of 15+ years
Ultra High Power Handling RF and Microwave Absorber
DMC provides extremely powerful RF absorbers with a 30 kW/Sqm handling capacity. This silicon carbide pyramid absorber is suitable for use in vacuum and has strong heat conductivity.
- Made of inorganic sintered material
- Can be easily installed with the metal T-shaped slot on base plate
- It is highly reliable
- Power handling capacity of at least 30 kW/Sqm
Special Purpose RF And Microwave Absorber
DMC offers custom shape and size of broadband premium quality high performance absorbers of both Polyurethane and Expanded Polypropylene (EPP) absorbers for EMC chamber and Antenna chamber application.
Broadband High Performance RF and Microwave Flat Absorber – Polyurethane (PU)
DMC series of Ultra-premium high performance Polypropylene Hybrid Absorbers are made of the molding process and the State-of-the-art carbon synthesis process ensures extremely high uniformity of carbon powder density throughout the absorber.
- Frequency range 80MHz to 100GHz
- Typical reflectivity as high as -50dB
- Power handling capacity 1.5kW/m2,540 V/m CW Radiated field strength
- Fire Retardant per NRL-8093 1,2,3, UL 94 and DIN 4102-B2
- Continuous working temperature up-to 90°C
- RoHS Compliant
- Zero Carbon dust
Broadband High Performance RF and Microwave Flat Absorber – Expanded Polypropylene (EPP)
DMC series of Ultra-premium high performance Polypropylene Flat Absorbers are made of molding process and State-of-the-art carbon synthesis process to ensure extremely high uniformity of carbon powder density throughout the absorber.
- Frequency range 1GHz to 40GHz
- Typical reflectivity as high as -39dB
- Power handling capacity 4.8kW/m2, 1353 V/m CW Radiated field strength
- Fire Retardant per NRL-8093 1,2,3, UL 94:2013, HBF and DIN 4102 and Class B2
- Continuous working temperature up-to 120°C
- Clean Room suitable per ISO 14644 Class5
- Water Resistant per GB/T 4208-2017
- RoHS and REACH Compliant
- Zero Carbon dust
Broadband High Performance RF and Microwave Truncated Absorber
DMC series of RF and Microwave Pyramidal Foam absorbers are available in Truncated version and are made by removing 20% of pyramid absorber tips to give similar performance as standard pyramid absorbers at low frequency with ferrite tiles and they are are mainly used in EMC chambers
- Frequency range 30MHz to 40GHz
- Typical reflectivity as high as -30dB
- Power handling capacity 1.5kW/m2,540 V/m CW Radiated field strength
- Fire Retardant per NRL-8093 1,2,3, UL 94 and DIN 4102-B2
- Continuous working temperature up-to 90°C
- RoHS Compliant
- Zero Carbon dust
Broadband High Performance RF and Microwave Wedge Absorber
DMC Polyurethane Wedge Absorbers are mainly used in Antenna test chambers, Compact range and GTEM cells.
- Frequency range 500MHz to 100GHz
- Typical reflectivity as high as -50dB
- Power handling capacity 1.5kW/m2,540 V/m CW Radiated field strength
- Fire Retardant per NRL-8093 1,2,3, UL 94 and DIN 4102-B2
- Continuous working temperature up-to 90°C
- RoHS Compliant
- Zero Carbon dust
High Performance RF and Microwave Walkway Absorber – Expanded Polypropylene (EPP)
DMC walkway absorber structure is topped with a higher density Polypropylene laminate. PP-WW series offer excellent load bearing and wear characteristics. The material’s ability to withstand higher loads than most walkway materials is due to the construction technique. The standard Walkway absorbers are available in 600mmx600mm or 600mmx1200mm footprint dimensions. Custom sizes and shapes can be provided. The walkway absorber is taller than standard absorber. We generally recommend using walkways one size smaller than surrounding absorbers. Typical reflectivity data can be provided upon request.
- Frequency range 500MHz to 40GHz
- Typical reflectivity as high as -45dB
- Max load capacity 302 kg/m2
- Power handling capacity 4.8kW/m2, 1353 V/m CW Radiated field strength
- Fire Retardant per NRL-8093 1,2,3, UL 94:2013, HBF and DIN 4102 and Class B2
- Continuous working temperature up-to 120°C
- Clean Room suitable per ISO 14644 Class5
- Water Resistant per GB/T 4208-2017
- RoHS and REACH Compliant
- Zero Carbon dust
Ferrite Absorber and Ferrite tiles for EMC Chamber
DMC Ultra-premium high performance Ferrite carbon based Hybrid Absorber are made of molding process and the State-of-the-art carbon synthesis process ensures extremely high uniformity of carbon powder density throughout the absorber. DMC-FC-PY-HY series hybrid absorbers provide excellent performance in normal incidence and off angle incidence in EMI/EMC test chambers.
DMC Broadband Ferrite absorbers
DMC Ferrite based electromagnetic wave absorber are used with combination of ferrite tiles. It has operating frequencies from 30 MHz to 40 GHz and thanks to its compact size, the Ferrite Series is suitable for maximizing chamber internal space.
- Frequency range 30MHz to 40GHz
- Typical reflectivity as high as -50dB
- Power handling capacity 1.8kW/m2, 1353 V/m CW Radiated field strength
- Fire Retardant per NRL-8093 1,2,3, UL 94:2013, HBF and DIN 4102 and Class B2
- Continuous working temperature up-to 120°C
- Clean Room suitable per ISO 14644 Class5
- Water Resistant per GB/T 4208-2017
- RoHS and REACH Compliant
- Zero Carbon dust
DMC Ferrite tiles for EMC Chamber
DMC Ferrite tiles are precision machined to have almost zero dimensional tolerance which helps in proper alignment of tiles, reduce gap between tiles resulting in better performance and Normalized site attenuation of EMC chambers per ANSI C63.4 and applications per CISPR 16-1-4 and IEC 61000-4-3
- Frequency range 30MHz to 1GHz
- Typical reflectivity as high as -38dB
- Impedance matched with DMC polyurethane and Polypropylene hybrid absorbers
- Fire Resistant
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FAQ's
What are RF Absorbers?
RF absorbers are specialized foam materials designed in Pyramidal, Convoluted and Wedge shapes to attenuate (reduce) radio frequency (RF) and microwave signals by absorbing electromagnetic energy instead of reflecting it. They are commonly used in EMC test chambers, Anechoic chambers, Radar cross-section (RCS) ranges, and Antenna measurement facilities to minimize reflections across wide frequency bands and create controlled RF quiet test environments.
What are the common types of RF absorbers for EMC testing?
1. Ferrite Tile Absorbers – Thin, rigid panels that work effectively at low frequencies (30 MHz – 1 GHz).
2. Pyramidal Foam Absorbers – Lightweight, carbon-loaded polyurethane foam shaped into pyramids, effective at higher frequencies (500 MHz – 110 GHz).
3. Pyramidal Hybrid RF Absorbers – Combination of ferrite tiles (for low frequencies) with foam pyramids (for high frequencies), providing broadband performance.
4. Truncated EMC Absorbers – Used where space is limited or for specific frequency bands for higher attenuation over low, mid and higher frequency range for bigger Quiet zone area.
What are the best RF absorbers for EMC testing?
The “best” absorber depends on the test requirements:
- Ferrite tiles for low-frequency EMC compliance testing (CISPR, MIL-STD-461, etc.).
- Pyramidal RF foam absorbers for antenna and high-frequency EMC testing.
- Pyramidal Hybrid RF absorbers when wideband coverage (30 MHz – 40+ GHz) is required.
- Truncated absorbers Truncated absorbers are often used in hybrid chambers (with ferrite tiles beneath), balancing broadband performance (30 MHz – 18 GHz+) while keeping chamber size and cost efficient
What are the best RF absorbers for Antenna testing?
Pyramidal Foam RF Absorbers
- Most widely used for antenna test ranges (anechoic chambers).
- Provide excellent broadband absorption (500 MHz – 110 GHz).
- Tall pyramids (e.g., 12”–36”) deliver higher performance at lower frequencies.
- Ideal for far-field and near-field antenna measurements.
Wedge Absorbers
- Used in very high-performance chambers where ultra-low reflectivity is required.
- Reduce specular reflections better than pyramids by avoiding parallel surfaces.
Convoluted/Flat Foam Absorbers
- Used where space is restricted or in compact antenna test ranges (CATR).
- Provide decent absorption at higher frequencies in smaller chambers.
How do RF absorbers reduce reflections?
RF absorbers work by converting incident electromagnetic energy into heat through resistive or magnetic losses. Instead of reflecting into the chamber, the energy is dissipated inside the absorber material, reducing standing waves and improving measurement accuracy. The impedance matching happens between permittivity of free space and carbon content in foam material to enhance absorption
What makes pyramidal foam absorbers effective?
The tapered pyramid shape provides a gradual impedance transition between free space and the absorber material, minimizing reflections. Taller pyramids generally improve low-frequency performance, while shorter pyramids are effective at higher frequencies. The electrical length of absorber matches with wavelength of operating frequency to give optimal attenuation and ½ wavelength and Quarter wavelength with reflectivity curve values vs frequency
Can hybrid absorbers be used to cover wide frequency ranges?
Yes. Hybrid absorbers combine ferrite tiles (low-frequency absorption) with pyramidal foam (high-frequency absorption). This makes them ideal for EMC compliance test chambers that need broad coverage from 30 MHz up to 40+ GHz.
What reflectivity levels should I expect or target?
- Ferrite tiles: –10 dB to –20 dB (30 MHz–1 GHz).
- Foam absorbers: –30 dB to –60 dB (500 MHz–40+ GHz).
- Hybrid absorbers: –20 dB at 80 MHz, improving to –40 dB or better above 1 GHz.
Your target depends on compliance standards and measurement accuracy requirements.
What installation considerations are important?
- Surface preparation: Ensure walls are flat and sealed before installing ferrite tiles.
- Adhesive & mounting: Use recommended adhesives or mechanical fasteners for secure placement.
- Alignment: Tiles and foam should be properly aligned to avoid gaps, which can degrade performance.
- Chamber design: Absorber thickness and type should match the chamber size and frequency range.
How are RF absorbers maintained and installed?
Installation:
Typically done in two stages – ferrite tiles mounted on walls/ceiling, followed by foam absorbers glued or mechanically fixed on top.
Maintenance:
- Regularly inspect for dust, moisture, or physical damage.
- Use vacuum cleaning or gentle compressed air for foam absorbers.
- Keep humidity below recommended levels to prevent foam degradation.
- Replace damaged absorbers promptly to maintain performance.
How do ferrite absorbers differ from foam absorbers?
- Ferrite absorbers: Compact, heavy, and effective at low frequencies (30 MHz–1 GHz).
- Foam absorbers: Lightweight, bulky, and effective at higher frequencies (>500 MHz).
- Key difference: Ferrite tiles rely on magnetic losses, while foam absorbers rely on resistive losses from carbon loading