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Microwave Absorber
   

Honeycomb Pyramidal Microwave Absorber

PPG Cuming Microwave Logo

 

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.

    
 

ROHS

 

 

High Power Honeycomb 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.

 

 

Phenolic Coating

Air Velocity, ft/min.

Watts/inČ

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

Absorption (dB) at Freq. (GHz)

.08

.12

.3

.5

1

3

6

10

18

20
                           

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

 

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.

 

 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)

Absorption (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

 

Cuming


Last Updated: April 26, 2018
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