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High Power Microwave Absorber
Honeycomb Pyramidal Microwave Absorber PPG Cuming Microwave Logo Made in the USA
Cuming Microwave is the only full service supplier in the world offering a complete line of dielectric, artificial dielectrics, ray domes, RF absorbers and anechoic chambers for the international aerospace and electronics and defense industries.
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Microwave Absorber Index

Honeycomb High Power- Pyramidal

Honeycomb Radar - Flat Sheet

High Power Hollow Pyramidal

MIL-STD 461/462 E & RTCA-DO160 Absorber


Cuming High Power Honeycomb RF & Microwave Absorber

C-RAM SFC-HC

HIGH POWER

BROADBAND HONEYCOMB

MICROWAVE ABSORBER

 

PYRAMIDAL

500 MHz - 18 GHz

 

High Power Honeycomb RF & Microwave Absorber

 

Data

C-RAM SFC-HC is a series of high power broadband honeycomb RF and microwave absorbers made from specially treated pyramidal honeycomb.

Using a steep pyramid design, which provides an impedance gradient, C-RAM SFC-HC provides premium performance in anechoic chambers at both normal and off-normal incidence angles.

C-RAM SFC-HC absorbers, with no forced air, can handle up to 10 W/inČ of RF energy with a phenolic coated honeycomb.

 

 

Phenolic Coating

Air Velocity, ft/min.

Watts/inČ

0

10

200

20

300

40

400

60

600

80

Neoprene Coating

Air Velocity, ft/min.

Watts/inČ

100,

6

300

12

C-RAM SFC-HC PYRAMIDAL HONEYCOMB PHYSICAL CHARACTERISTICS
TYPICAL REFLECTIVITY AT NORMAL INCIDENCE (dB)

Model

Absorber Height
in. (mm)

Weight

 lbs. (kg)

Tips /
Piece

Reflectivity (dB) at Freq. (GHz)

.08

.12

.3

.5

1

3

6

10

18

20

SFC-HC-3

3Œ (82) 2.25 (1.0) 256         12 25 30 35 38 38

SFC-HC-4

4.3 (109)

3.0 (1.4)

144

 

 

 

 

20

25

30

40

40

40

SFC-HC-5

5 (127)

3.3 (1.5)

144

23

28

35

40

45

45

SFC-HC-6

6.0 (152)

3.5 (1.6)

100

 

 

 

 

23 28 35 40 45 45

SFC-HC-8

8.0 (203)

4.5 (2.0)

64

 

 

 

21

25

32

40

45

45

45

SFC-HC-12

12.0 (305)

6 (2.7)

36

 

3

13

24

30

35

40

45

45

45

SFC-HC-18

18.0 (457)

12 (5.4)

16

 

6

20

27

34

35

42

45

45

45

SFC-HC-24

24.0 (610)

16 (7.2)

9

7

9

25

30

35

40

44

45

45

45

Cuming Honeycomb Radar Absorber

 C-RAM HC

LIGHTWEIGHT, STRUCTURAL, BROADBAND

HONEYCOMB RADAR ABSORBER

 

FLAT SHEET

 

Flat Honeycomb Radar Absorber

 

Data

C-RAM HC is a series of radar absorbing products made from Nomex/phenolic or glass/phenolic honeycomb with a proprietary lossy coating.

Typically, Nomex/phenolic is used in most applications. The hexagonal open cell structure provides a high strength-to-weight ratio, making C-RAM HC an ideal material for aircraft parts, such as fairings, covers, and leading edges, which must combine strength, light weight, and low radar cross section. Honeycomb is also ideal for cavity backed spiral antenna applications.

The open cells permit forced air cooling, allowing high-power applications.

On special order skins can be provided on the core, typically glass, Kevlar, or AstroQuartz skins can be provided.

Custom composite shapes are also available per customer drawings.

C-RAM HCGR X/Y:

Gradient loaded flat sheets with reflectivity as follows, where X = thickness and Y=reflectivity.

0.500" -15 dB minimum 10GHz to 18 GHz

0.750" -15 dB minimum 8 GHz to 18 GHz

1.000" -15 dB minimum 6 GHz to 18 GHz

 

C-RAM HCGI X/Y:

Gradient loaded flat sheets with insertion loss tuned to customer requirements, where X = thickness in inches and Y = insertion loss in dB/inch.

Maximum insertion loss is 20 dB/inch.

 

C-RAM HCUI X/Y:

Uniformly loaded flat sheets with insertion loss tuned to customer requirements, where X = thickness and Y = insertion loss in dB/inch.

Maximum insertion loss is 30 dB/inch.


Cuming High Power Hollow Pyramidal RF & Microwave Absorber

 C-RAM HPA

HIGH PERFORMANCE RF ABSORBER FOR MEDIUM HIGH POWER  

 

HOLLOW PYRAMIDAL

 

30 MHz - 40 GHz

 

Hollow Pyramidal RF Absorber

 

Data

C-RAM HPA is a hollow pyramidal RF absorber
designed to provide high levels of absorption in
high power applications. Typical uses include
the hot spots in test rooms or anechoic
chambers where heating due to concentrated
power might damage conventional materials or
lead to danger of smoke and fire. Power
densities of up to 2 W/in2 have been handled
successfully. C-RAM HPA is usually used with
other products such as C-RAM SFC or C-RAM
EVA in an anechoic chamber application.

 

C-RAM HPA consists of lightweight, hollow
pyramids. The pyramids are formed by folding
relatively thin sheets of lossy foam plastic into
shape and bonding them to a foam back panel.
As an option, small vent holes may be bored
through the walls of the absorber, allowing
forced cooling air to be blown through the piece
from behind.

TYPICAL REFLECTIVITY AT NORMAL INCIDENCE (dB) (SFC-HPA)

Model

Height
in. (mm)

Weight
lb. (kg)

Tips
Per Piece

30MHz

100MHz

300MHz

1GHz

3GHz

10+GHz

HPA-36

38 (965)

12 (5.5)

4

-

5

25

35

45

50

HPA-48

50 (1270)

16 (7.3)

4

5

10

30

45

50

50


 Cuming MIL-STD 461/462G & RTCA-DO160 Absorber

 C-RAM SFC-EM

 RF ABSORBER FOR EMC CHAMBERS

TRUNCATED PYRAMIDAL

 

MIL-STD 461/462G

RTCA-DO160

EN 1000-4-3

 

MIL STD 461 RF Absorber

 

Data

The C-RAM SFC-EM product is similar to standard C-RAM SFC pyramidal grades, but having the tips of the pyramids truncated. This saves space in small chambers and provides a more rugged product, eliminating the possibility of tip breakage.

 

C-RAM SFC-24 EM meets the requirements for MIL-STD 461/462G.

 

C-RAM SFC-36 EM and C-RAM SFC-24 EM, in an appropriate combination in a chamber, are an ideal absorber treatment for Immunity Test Chambers (EN 1000-4-3 and equivalent specifications).


 
MIL-STD-461/462 Absorber Layout

C-RAM SFC-EM TRUNCATED PYRAMIDAL PHYSICAL CHARACTERISTICS
TYPICAL REFLECTIVITY AT NORMAL INCIDENCE (dB)

Model

Absorber Height

in. (mm)

Weight

 lbs. (kg)

Reflectivity (dB) at Freq. (MHz)

80 250 500 1K 10K
SFC-24EM 20 (510) 17 (7.7) 8 24 35 38 40
SFC-36EM 31 (760) 25 (11.4) 13 29 37 40 40
SFC-48EM 42 (1067) 35 (16) 16 32 39 40 40


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