EMI / RFHigh Performance Absorbers
Global EMC provide a wide range of anechoic absorber for RF, EMC and microwave applications. Specifically designed to reduce or eliminate the reflections from electromagnetic waves by absorbing the energy, dissipating the waves and turning it into heat energy. Designed to cover a wide frequency range, our portfolio of anechoic absorbers range from microwave absorbers, through to high power and hybrid absorbers.
PLEASE NOTE – MINIMUM ORDER VALUE OF £ 9,000 GBP or $10,000 USD APPLIES TO ALL ABSORBER ENQUIRIES.
Microwave Absorbers
Microwave Pyramidal absorbers are designed specifically for the use in Antenna measurement, 5G and Radar test chambers. The absorber using ‘progressive impedance’ absorbs the radio wave/microwave through a resistive structure having a progressive shape, this converts the electromagnetic energy to heat energy.
Global EMC offers two different types of Microwave pyramidal absorber: The RLTF-xxx range and the GDSxxx range.
RLTF-250/450/650/900 – This NEW product is a solid homogeneous resistive doped polystyrene system. This product has some major advantages including zero shedding (to cleanroom standard), precise and gap-less fit, extended lifespan, damage resistant and cleanable.
GDSxxx – This is the doped foam type, used for many years and has proved to be fully compliant in antenna measurement test chambers. This traditional option is more cost-effective.
RLTF-xxx Range
| Length (mm) | Part No. | Base size (mm) | Weight Kg/m² | Normal incidence return loss (-dB) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 200 MHz | 300 MHz | 500 MHz | 1 GHz | 3 GHz | 5 GHz | 10 GHz | 15 GHz | 40 GHz | |||||
| 250 | RLTF-250 | 600x600 | 7.7 | N/O | N/O | 17 | 25 | 40 | 45 | >55 | >55 | >55 | |
| 450 | RLTF-450 | 600x600 | 13 | N/O | 17 | 25 | 35 | 45 | 50 | >55 | >55 | >55 | |
| 650 | RLTF-650 | 600x600 | 15.5 | 20 | 25 | 30 | 40 | 50 | 50 | >55 | >55 | >55 | |
GDSxx Range
| Length (mm) | Part No. | Base size (mm) | Weight Kg/m² | Normal incidence return loss (-dB) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 100 MHz | 200 MHz | 300 MHz | 500 MHz | 1.5 GHz | 3 GHz | 5 GHz | 10 GHz | 15 GHz | 40 GHz | |||||
| 50 | GDS50 | 500x500 | 1.8 | N/O | N/O | N/O | N/O | N/O | 20 | 25 | 30 | 35 | 40 | |
| 100 | GDS100 | 500x500 | 3.3 | N/O | N/O | N/O | N/O | 15 | 30 | 35 | 40 | 45 | 50 | |
| 200 | GDS200 | 500x500 | 6.3 | N/O | N/O | N/O | 15 | 28 | 38 | 45 | 50 | 50 | 50 | |
| 300 | GDS300 | 500x500 | 9 | N/O | N/O | N/O | 20 | 3O | 40 | 45 | 55 | 55 | 60 | |
| 400 | GDS400 | 500x500 | 12 | N/O | N/O | 17 | 23 | 32 | 42 | 45 | 55 | 55 | 60 | |
| 500 | GDS500 | 500x500 | 15 | N/O | 17 | 20 | 28 | 35 | 45 | 50 | 60 | 60 | 60 | |
| 700 | GDS700 | 250x500 | 21 | 12 | 20 | 25 | 30 | 40 | 50 | 55 | 60 | 60 | 60 | |
| 1000 | GDS1000 | 334x334 | 30 | 15 | 27 | 32 | 37 | 45 | 55 | 60 | 60 | 60 | 60 | |
Hybrid Pyramidal Absorbers
Hybrid Pyramidal absorbers are designed specifically for the use over ferrite tiles. The resistive doping is far less than normal pyramidal absorbers and is very specific.
Global EMC offers two different types of Hybrid pyramidal absorber: The RLTxxx range and the GDSxxx-H3 range.
Compatible Chamber Type/Applications: SAC-3m-C, SAC-10m-C, FAC-3m-PCE, FAC-3m-C, CISPR12/25-V, CISPR12/25-C, MIL-STD461G, DEF-STAN59-411
RLT250/450/650/900 – This NEW product is a solid homogeneous resistive doped polystyrene system. This product has some major advantages including zero shedding (to cleanroom standard), precise fit and gap-less fit, extended lifespan, damage resistant and cleanable.
GDSxxx-H3 – This is the doped foam type, used for many years and has proved to be fully compliant in CISPR16-4-1 3m, 5m and 10m EMC test chambers. This traditional option is more cost-effective.
RLT-xxx Range
| Length (mm) | Part No. | Base size (mm) | Weight Kg/m² | Normal incidence return loss (-dB) | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 100 MHz | 500 MHz | 1 GHz | 5 GHz | 10 GHz | 40 GHz | |||||
| 250 | RLT-250 | 600x600 | 4.7 | 16 | 18 | 11 | 14 | 15 | 30 | |
| 450 | RLT-450 | 600x600 | 8.7 | 20 | 17 | 20 | 25 | 35 | 40 | |
| 650 | RLT-650 | 600x600 | 13.6 | 22 | 20 | 22 | 28 | 40 | 40 | |
| 900 | RLT-900 | 600x600 | 18.4 | 23 | 24 | 24 | 30 | 40 | 40 | |
| RLT250 applied to edge of swing doors | ||||||||||
GDSxx-H3 Range
| Length (mm) | Part No. | Normal incidence return loss (-dB) | |||||||
|---|---|---|---|---|---|---|---|---|---|
| 30 MHz | 100 MHz | 500 MHz | 1 GHz | 5 GHz | 10 GHz | 18 GHz | |||
| 300 | GDS300-H3 | 15 | 22 | 20 | 15 | 17 | 20 | 22 | |
| 500 | GDS500-H3 | 15 | 23 | 22 | 17 | 18 | 20 | >30 | |
| 850 | GDS850-H3 | 17 | 25 | 27 | 25 | 25 | 35 | >45 | |
High Power Absorbers
Global EMC’s High powered phenolic layered honeycomb is constructed into lossy carbon pyramidal absorber.
The GDS500-HPP and GDS900-HPP are built with high temperature tolerant phenolic cement into a hollow profile so as to minimise airflow impedance. Available in two lengths of 500mm and 900mm.
The heat resistant honeycomb construction allows heat dissipation and inhibits heat build-up.
Base Dimensions: 500mm x 500mm.
Full Specification
| Length (mm) | Part No. | Static handling | 3m/second handling | Normal incidence return loss (-dB) | ||||
|---|---|---|---|---|---|---|---|---|
| 200 MHz | 500 MHz | 1 GHz | 10 GHz | |||||
| 500 | GDS500-HPP | >15Kw/m² | >20Kw/m² | 15 | 25 | 35 | 50 | |
| 900 | GDS900-HPP | >15Kw/m² | >15Kw/m² | 20 | 25 | 45 | 50 | |
Long Hollow Absorbers
The Global EMC ‘Hollow pyramid absorber’ is designed to give excellent return loss performance and compliance.
The GDS-CAH system has a rigid structure so that it does not deflect under its own weight even when 2 metres long.
This absorber system has a true broadband performance from 30MHz to 18GHz+ and does not suffer the problems of employing two technologies: Magnetic permeability of Ferrite tiles versus Progressive Impedance of resistive pyramidal absorbers.
This multi-layered absorber system is unique to Global EMC and the resultant performance causes compliance to CISPR EMC emission standards and all IEC/EN 61000.4.3 EMC immunity standards.
Base Dimensions: Base dimensions: GDS-CAH1300 – 334 x 334mm, GDS-CAH1600 – 400 x 400mm, GDS-CAH2000 – 500 x 500mm, GDS-CAH2400 – 600 x 600mm.
Compatible Chamber: SAC-10m-C-LP (10m CISPR16-1-4 compliant).
Full Specification
| Length (mm) | Part No. | Normal incidence return loss (-dB) | ||||||
|---|---|---|---|---|---|---|---|---|
| 30 MHz | 150 MHz | 300 MHz | 500 MHz | 3 GHz | 10 GHz | |||
| 1300 | GDS-CAH1300 | 15 | 27 | 30 | 35 | 50 | 50 | |
| 1600 | GDS-CAH1600 | 17 | 30 | 35 | 40 | 50 | 50 | |
| 2000 | GDS-CAH2000 | 20 | 33 | 37 | 45 | 50 | 50 | |
| 2400 | GDS-CAH2400 | 22 | 35 | 40 | 50 | 50 | 50 | |
Wedge Absorbers
Wedge absorbers give around 20% more anechoic performance than full peak absorbers at frequencies below 1 GHz, due to their greater mass. The wedge system is used where a low-frequency bias is required.
Using the 20% mass the Wedge absorber system can save money by using smaller pyramids and the microwave performance is excellent with a return loss of -40dB at 8 x wavelength.
Global EMC’s wedge pyramid absorber gives excellent performance in compact chambers.
Compatible chambers/applications: MIL-STD461G, CISPR12/25, ETSI, Radio/Low Microwave Work.
Full Specification
| Length (mm) | Part No. | Normal incidence return loss (-dB) | ||||||
|---|---|---|---|---|---|---|---|---|
| 50 MHz | 100 MHz | 300 MHz | 1000 MHz | 5 GHz | 10 GHz | |||
| 300 | GDS300-W | N/O | N/O | 18 | 30 | 35 | 40 | |
| 400 | GDS400-W | N/O | 12 | 20 | 30 | 40 | 40 | |
| 500 | GDS500-W | N/O | 17 | 25 | 32 | 40 | 40 | |
| 700 | GDS700-W | 15 | 20 | 30 | 35 | 40 | 40 | |
Special Absorbers
The principal of this type of absorber is to mimic free space by ‘progressive impedance’ that is, to progressively absorb the radio wave/microwave through a resistive structure having a progressive shape, this converts the electromagnetic energy to heat energy.
The available thicknesses are:
25mm thick (part No GLD - block 25).
50mm thick (part No GLD - block 50).
75mm thick (part No GLD – block 75).
Block foam absorbers use graded doping, the available thicknesses are:
25mm thick, performance >-17dB above 5GHz (part No GLD-FL-25).
50mm thick, performance >-17dB above 2.5GHz (part No GLD-FL-50).
100mm thick, performance >17dB above 1.2GHz (part No GLD-FL-100).
Other Special Absorbers products: Machinable bar/sheet stock, rubber flat sheet 1.2mm~10mm thickness, walkway block absorber (for antenna measurement chambers), thin layer (lossy) doped foam, ultra-performance microwave absorbers that can reach -70dB return loss, anti-back-scatter absorbers, Chebyshev absorber layouts.
PLEASE NOTE – A MINIMUM ORDER VALUE OF £ 9,000 GBP or $10,000 USD APPLYS TO ALL ABSORBER ENQUIRIES.