ECCOSORB® AN is a carbon-loaded, multilayer polyurethane foam absorber tailored for broadband free-space RF absorption. It’s engineered to reflect less than –17 dB of normal incident energy at frequency ranges determined by its thickness.
Key Performance Advantages
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Lightweight and flexible construction
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Broadband EMI reduction
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RoHS/REACH compliant
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Rated up to 90°C (194°F) service temperature
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UL94-HBF flame retardant rating
Where Eccosorb® AN Used
Applications span across a wide range of RF-critical environments:
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Anechoic and test chambers to reduce reflections
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Antenna shrouding to improve pattern integrity and reduce backlobes
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Mitigating crosstalk between adjacent antennas
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RCS (Radar Cross-Section) testing support
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Radar system testing while maintaining personnel safety
Thickness Options & Operating Frequency Ranges
| Grade | Frequency Range (>17 dB) | Nominal Thickness | Typical Weight |
|---|---|---|---|
| AN-72 | > 20 GHz | 0.6 cm (0.24”) | 0.25 kg (0.6 lb) |
| AN-73 | > 7.5 GHz | 1.0 cm (0.39”) | 0.50 kg (1.1 lb) |
| AN-74 | > 3.5 GHz | 1.9 cm (0.75”) | 0.70 kg (1.5 lb) |
| AN-75 | > 2.4 GHz | 2.9 cm (1.14”) | 0.80 kg (1.8 lb) |
| AN-77 | > 1.2 GHz | 5.7 cm (2.24”) | 1.50 kg (3.3 lb) |
| AN-79 | > 600 MHz | 11.4 cm (4.49”) | 2.95 kg (6.5 lb) |
Converting Options: Waterjet vs. Die-Cutting
| Requirement | Best Choice | Why |
|---|---|---|
| Thick absorber blocks or large 3D shapes | Waterjet cutting | Clean edges, complex geometry, no crushing of foam |
| High-volume thin foam parts | Steel-rule die-cutting | Fast, precise, cost-effective, ideal for repeated patterns |
We routinely hold tight tolerances, apply pressure-sensitive adhesives, and laminate to metal or plastic carriers when required.
Surface, Handling & Mounting Options
ECCOSORB® AN features:
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White front surface that faces the RF energy
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Black back surface designed for mounting
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Optional aluminum foil backing when a metal surface is not available
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Sealed environmental versions available, including nylon-coated, polyurethane-coated, or PVC-sealed constructions with fastening options