RF & Microwave Absorbers – Pyramidal, Hybrid & Ferrite Families | ETS-Lindgren
ETS‑Lindgren offers a comprehensive absorber portfolio for EMC, OTA and antenna measurement environments, spanning pyramidal and wedge foams, ferrite tiles, hybrid ferrite+foam systems, polystyrene hybrid panels, and specialized variants (curvilinear, high‑power, flat laminate, filter/vent foams, walkway). Coverage extends from sub‑GHz through mmWave with options for low‑profile rooms, high‑field immunity and compact ranges.
ETS‑Lindgren offers a comprehensive absorber portfolio for EMC, OTA and antenna measurement environments, spanning pyramidal and wedge foams, ferrite tiles, hybrid ferrite+foam systems, polystyrene hybrid panels, and specialized variants (curvilinear, high‑power, flat laminate, filter/vent foams, walkway). Coverage extends from sub‑GHz through mmWave with options for low‑profile rooms, high‑field immunity and compact ranges.
Key Benefits
- Broadband performance: solutions from 30 MHz up to 40–100 GHz depending on family and height.
- Space‑efficient options: ferrite tiles and hybrid systems deliver low depth for CISPR/ANSI semi‑anechoic rooms.
- High‑power capability: engineered variants handle elevated power densities and elevated temperatures for immunity and radar applications.
- Fire performance & durability: formulations tested to industry fire standards; FlexSorb™ treatment available for improved handling and wear.
- Measurement integrity: solutions optimized for ANSI C63.4, CISPR 16/25, MIL‑STD‑461 and OTA methods.
Main Features
- Pyramidal foam (EHP): broadband reflectivity reduction with multiple heights for tuning the LF cutoff; optional FlexSorb™ coating; fire‑retardant formulations.
- Wedge foam: same RF reflectivity as equivalent pyramid height; preferred on walls/backscatter‑sensitive zones in compact ranges.
- Flat laminate (lossy foam blocks): graded‑dielectric multilayer blocks for moderate absorption; easy to cut and place near positioners/fixtures.
- Filter/Vent foam (FF): airflow‑permeable geometry for enhanced power handling while maintaining absorber performance.
- Curvilinear absorber (CRV): contoured profile for chamber backwalls and hot‑spots where higher normal‑incidence attenuation is required in limited depth.
- High‑Power honeycomb (HP): phenolic honeycomb with lossy coating for high field densities and elevated temperature stability; supports vacuum “pump‑down”.
- Ferrite tile (FT‑1500/1500C): precision‑machined tiles minimize inter‑tile gaps; thin profile baseline for EMC rooms.
- Hybrid ferrite+foam (FerroSorb FS‑series): ferrite base plus matched foam for 30 MHz–40 GHz operation in semi‑anechoic rooms; high E‑field immunity capability.
- Polystyrene hybrid (DuraSorb DSH): closed‑cell, non‑hygroscopic panels with ferrite base for compact, durable installations (CISPR 25, MIL‑STD, small ANSI rooms).
Typical Applications
- EMC compliance chambers: CISPR 16/25, ANSI C63.4, MIL‑STD‑461 immunity/susceptibility and emissions.
- Wireless/OTA & antenna ranges: 5G FR1/FR2, WLAN, GNSS, radar, V2X and compact ranges with tight quiet‑zone constraints.
- Automotive & e‑Mobility: vehicle/EV‑component chambers with space‑efficient hybrid treatments.
- High‑field/immunity labs: absorbers engineered for elevated power densities and thermal robustness.
Additional Information
EMCO Elektronik (DACH) supports end‑to‑end absorber selection and chamber treatments: requirements capture, numerical modeling and layout, bill‑of‑materials definition, logistics and installation coordination, and site acceptance (NSA/SVSWR, field uniformity). We align absorber families to your standards, geometry and budget, and coordinate with your integrator for risk‑free deployment.
Family Comparison (overview)
| Family / Type | Representative Series | Core Use Case | Typical Frequency Envelope | Notes |
|---|---|---|---|---|
| Pyramidal Foam | EHP (3–72 in heights) | Broadband reflection control, OTA & EMC walls/ceilings | ~30 MHz to 40–100 GHz (height‑dependent) | Fire‑retardant; optional FlexSorb™ |
| Wedge Foam | EHP‑WG | Backscatter control in compact ranges | Similar to same‑height pyramids | Transition pieces available for tapered ranges |
| Flat Laminate | FL series | Near fixtures/positioners; moderate absorption | ~0.5–3 GHz and above (thickness‑dependent) | Graded‑dielectric multilayer; easy to cut |
| Filter/Vent Foam | FF‑3…FF‑36 | High airflow with absorber performance | ~80 MHz to 40 GHz (height‑dependent) | Higher power density with ventilation |
| Curvilinear | CRV‑15…CRV‑67 | Backwalls/hot‑spots; improved normal‑incidence loss | ~80/100–40 GHz (model‑dependent) | Contours extend LF performance in limited depth |
| High‑Power Honeycomb | HP‑3…HP‑24 | High field immunity / thermal stress | Broadband (height‑dependent) | Phenolic honeycomb; vacuum‑friendly |
| Ferrite Tile | FT‑1500 / 1500C | Low‑profile EMC rooms (LF baseline) | Sub‑GHz to low GHz | Precision‑machined tiles; thin profile |
| Hybrid Ferrite+Foam | FerroSorb FS‑200/300/980/1500H | EMC semi‑anechoic chambers | ~30 MHz to 18–40 GHz (series‑dependent) | High E‑field levels; space‑saving |
| Polystyrene Hybrid | DuraSorb DSH‑400H/600H/1250H | Compact, durable EMC rooms; automotive | ~30 MHz to 40 GHz | Closed‑cell, non‑hygroscopic; ferrite base |
