Broadband Microwave Truncated Absorber 300mm

Broadband High Performance RF and Microwave Truncated Absorber

DMC Truncated Series foam absorbers are mainly used in EMC Chambers. RF Truncated Absorber are made by removing 20% Pyramid absorber tips to give same performance as Standard Pyramid in low frequency range. The advantage of RF Truncated Absorber are to provide large working space inside chamber , stronger resistance capability against mechanical damage and eliminating drooping of tips.

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

Part number reference:
DMC-PU-TR-300, DMC-PU-TR-500, DMC-PU-TR-700, DMC-PU-TR-1000

Datasheet

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TYPICAL REFLECTIVITY AT NORMAL INCIDENCE OVER FREQUENCY RANGE IN dB

Model Number	30 MHz	80 MHz	300 MHz	500 MHz	1 GHz	3 GHz	6 GHz	10 GHz	18 GHz	40 GHz
DMC-PU-TR-HY-300	11	20	17	18	15	13	17	22	25	28
DMC-PU-TR-HY-500	13	23	20	20	16	18	22	25	28	30
DMC-PU-TR-HY-700	15	25	21	20	20	20	25	28	30	30
DMC-PU-TR-HY-1000	17	27	25	25	25	30	30	35	30	30

DMC-PU-TR-HY-300

DMC-PU-TR-HY-500

DMC-PU-TR-HY-700

Frequently Asked Questions

What is an RF and Microwave Truncated Absorber?

It is a foam RF absorber where the pyramid tip is truncated, designed to reduce electromagnetic reflections in EMC and RF test chambers.

Why is the absorber “truncated”?

About 20% of the pyramid tip is removed, which provides additional chamber space and improves mechanical durability without significantly affecting low-frequency performance.

What frequency range does the absorber support?

The absorber operates across 30 MHz to 40 GHz, covering most EMC and microwave testing applications.

What is the typical reflectivity of this absorber?

Typical reflectivity levels reach approximately −30 dB, depending on absorber size and frequency.

Where are truncated RF absorbers commonly used?

They are mainly used in EMC compliance chambers, antenna testing facilities, and RF measurement laboratories.

What material is used in this absorber?

The absorber is made from carbon-impregnated polyurethane foam, which efficiently absorbs electromagnetic energy.

What is the power handling capability?

It can handle approximately 1.5 kW/m² with a CW radiated field strength around 540 V/m.

Is the absorber fire-retardant?

Yes. It complies with NRL-8093, UL-94, and DIN 4102-B2 fire safety standards.

What is the maximum operating temperature?

The absorber can operate continuously at temperatures up to 90 °C in RF testing environments.

What benefits does it provide in RF testing?

It helps reduce RF reflections, improve EMC measurement accuracy, increase chamber space, and enhance mechanical durability.

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