Broadband Hybrid Pyramidal Absorbers

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Broadband hybrid pyramidal absorbers

PU foam based pyramid absorbers 3640

These PU foam based pyramid absorbers are the most popular solution for 3, 5 and 10 m EMC chambers in the market.

Solution for 3, 5 and 10 m EMC chambers in the market

These absorbers are the most popular solution for 3, 5 and 10 m EMC chambers in the market. They are composed of pyramidal, full tip SAM or truncated SMT pulsing the matching layer to separate the pyramidal part from the ferrite part. Through optimization, this product has a superb performance across 30 MHz to 18 GHz. The ferrite performs from 30 MHz to 1 GHz and the foam performs above 1 GHz.

Prototypes are made and the design is tested. Results become part of a valuable feedback loop for refining our design further.

Broadband Pyramidal Absorber is a low density polyurethane foam, filled with high loss dielectric material in open cell structure and finished with blue paint.

The general base size is 60 cm x 60 cm with 50 mm to 1200 mm height pyramidal. It’s flexible and light weight, can be attached on the wall easily. It is a high performance broadband RF absorber and widely used for Anechoic Chambers.

3640-300 (300 mm height PU foam based pyramid absorber)

Characteristics

Our Absorbers have a pyramid-shaped appearance, with blue color (it can be selected as request)
Pliable and flexible, these pyramids won’t bend after long-term use, and its absorbing properties is guaranteed for 10 years.
Oxygen index ≥ 29% (GB/T2406-93), which is B2 level (GB8624-1997) level flame retardant.
Good environmental performance, all raw materials can meet environmental requirements, non volatile, no smell and non-toxic.
Working conditions: general indoor application
- Long-time working temperature: -50 °C ~ 90 °C Short-time working temperature: -100 °C ~ 120 °C
- Relative humidity: 55% ± 15% Frequency range: 30 MHz ~ 110 GHz

Installation method:

An environmental protective adhesive is generally used to paste the absorbers on the shield body (inside of the Faraday cage). If the absorber height is below 500mm, Velcro installation can be applied. Fasteners can also be used to install the absorbers to facilitate the replacement of absorbers and the relocation of chambers when is necessary.

Schematic diagram of PU foam based microwave absorbers

Technical drawing of PU foam based pyramid absorbers

Product specification and part numbers

Part number	Base size (mm*mm)	Pyramid quantity per unit	Unit size ACB (mmmmmm)	Standard weight (kg/m2)
3640-50	600 x 600	900	50 x 18.5 x 15	1.5
3640-96	600 x 600	225	96 x 36 x 20	2.2
3640-190	600 x 600	81	190 x 65 x 50	4
3640-300	600 x 600	36	300 x 100 x 60	7
3640-495	600 x 600	16	495 x 145 x 65	11
3640-700	600 x 600	9	700 x 195 x 130	16
3640-1000	300 x 300	1	1000 x 300 x 150	22
3640-1200	400 x 300	1	1200 x 400 x 200	25

Bold items are 98% on stock

Reflection loss / Shielding performance

Part number	Reflection loss under vertical incidence (-dB @ GHz)											Power handling capacity
Part number	0.03	0.08	0.3	0.5	1	3	6	10	18	40	100	kW/m2
3640-50							30	35	40	50	45	1.5
3640-96						30	35	40	45	50	45	1.5
3640-190					27	35	40	45	50	50	48	1.5
3640-300				25	35	40	50	50	50	50	47	1.5
3640-495			20	30	40	45	50	50	50	50	48	1.5
3640-700		8	25	35	40	50	50	50	50	50	48	1.5
3640-1000		11	30	40	45	50	50	50	50	50	47	1.5
3640-1200	5	13	35	40	50	50	50	50	50	50	47	1.5
These values are measured under laboratory conditions. Results may differ in other situation. Please read our Guarantee.

Please note:

For the data below 500 MHz is obtained by low-frequency coaxial test method (GJB5239-2004).
For the data above 1 GHz is obtained by far-field RCS test method (GJB2038A-2011)
The performance data listed in the above table is the guaranteed data. The measured data is equal to or better than the guaranteed data.
The bold Part Number is a stock item and can be delivered immediately
Certification: CE RoHS

Technical Datasheet

3640 - PU Foam Based Pyramid Absorbers TDS.pdf

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Broadband Hybrid Pyramidal Absorbers