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Cuming Pyramidal Absorber

Cuming Pyramidal EMI Absorbers

PPG Cuming Microwave Logo 

Made in the USA 

Cuming Microwave - A Global Supplier of Microwave Absorbing Materials, Radar Absorbers, Dielectric Materials, Anechoic Chambers, EMC Chambers for the Defense, Electronic, Telecom, Medical and Automotive Industries.
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YouTube Video

Cuming Very High Performance Pyramidal RF & Microwave Absorber

 C-RAM SFC HP

VERY HIGH PERFORMANCE BROADBAND RF ABSORBER

 

PYRAMIDAL

 

120 MHz - 50 GHz

 

Very High Performance Pyramidal RF Absorber

Data

 

PSA 

 

Velcro 

C-RAM SFC-HP is a series of very high performance broadband RF absorbers made from specially treated low density polyurethane foam.

The product is flexible and tolerant of physical abuse.

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

These products meet all of the fire retardancy requirements of NRL Specification 8093 tests 1, 2, and 3, MS-8-21 tests 1, 2, and 3, and T.I. drawing 2693066, as well as ASTM E-84-97a, Class A.

Optional Clean Room Coating (CRC) Meets Class 100,000 (ISO 8)

PHYSICAL CHARACTERISTICS AND
TYPICAL REFLECTIVITY AT NORMAL INCIDENCE (SFC-HP)
Model Height
in. (mm)
Weight
lbs. (kg)
Tips
Per Piece
Reflectivity in dB at Frequency (GHz)
0.1 0.3 0.5 1.0 3.0 6.0 10 18 36* 50*
SFC-8HP 9 (228) 4.5 (2.0) 100   9 18 31 39 45 50 55 55 55
SFC-12HP 14 (356) 6 (2.7) 64 4 15 29 35 42 45 50 55 55 55
SFC-18HP 20 (508) 8 (3.6) 25 9 30 35 40 45 50 52 55 55 55
SFC-24HP 26 (660) 11 (5) 16 12 34 39 44 50 50 55 55 55 55
SFC-36HP 36 (914) 16 (7.2) 9 18 35 40 45 51 52 55 55 55 55
Notes: * SFC-HP has been characterized at 36 and 50 GHz, but is not routinely measured at these frequencies.

Cuming High Performance Pyramidal & Walkway Absorber

 C-RAM SFC

HIGH PERFORMANCE BROADBAND RF ABSORBER

 

PYRAMIDAL

 

120 MHz - 50 GHz

 

Very High Performance Pyramidal EMI Absorber

 

Pyramidal Absorber (Click to Enlarge)      Cuming C RAM SFC Various Sizes (Clivk to Enlarge)

Optional Clean Room Coating (CRC) Meets Class 100,000 (ISO 8)

 

Old Style Pyramidal Absorber

Black Tip Option

 

Data

 

YouTube Video

C-RAM SFC is a series of high performance broadband RF absorbers made from specially treated low density polyurethane foam.

The product is flexible and tolerant of physical abuse.

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

These products meet all of the fire retardancy requirements of NRL Specification 8093 tests 1, 2, and 3, MS-8-21 tests 1, 2, and 3, and T.I. drawing 2693066, as well as ASTM E-84-97a, Class A

Typically, C-RAM SFC absorbers can handle up to 1.0 W/in² (2 kW/m²) of RF energy in a temperature controlled room, but this is dependent upon frequency and application.


C-RAM SFC-ODP

HIGH PERFORMANCE BROADBAND RF ABSORBER FOR OUTDOOR USE

 

PYRAMIDAL (Outdoor)

 

120 MHz - 50 GHz

 

Outdoor Pyramidal RF & Microwave Absorbers

Data

C-RAM ODP is a series of very high performance absorbers similar to C-RAM EVA.

C-RAM ODP is made from a lightweight open cell foam with large pores. This large pore size allows rain water to drain readily and dry quickly after rain stops. The RF lossy coating is not affected by repeated exposure to rain.

C-RAM ODP is dimensionally equivalent to the corresponding grades of C-RAM SFC. The reflectivity characteristics are identical to those of C-RAM SFC.

C-RAM ODP is a very resilient material. It stands up well to moderate physical abuse and tolerates repeated deformations without tear or cracks.

C-RAM ODP is processed using a fire retardant saturant, however it does not meet the NRL 8093 test #1, 2 and 3 for fire retardancy.

Consequently the product is not recommended for indoor usage.


 C-RAM SFC-WW

HIGH PERFORMANCE BROADBAND RF ABSORBER

 

WALKWAY

 

Walkway RF Absorber

 

Cuming Walkway Absorber for Turntable (Click to Enlarge)

Data

C-RAM SFC-WALKWAY is a series of high performance broadband RF absorbers, fabricated from standard C-RAM SFC pyramidal absorber.

The SFC absorber is fit with a low density polystyrene foam matching section to square the piece off, and the sides and top of the block are fit with a half inch (13mm) thick sheeting of fire retardant polyvinyl chloride (PVC) rigid foam.

Walkway absorber provides an effective access path for servicing the transmit and receive areas of an anechoic chamber.

C-RAM SFC & ODP  PYRAMIDAL & WALKWAY PHYSICAL CHARACTERISTICS
TYPICAL REFLECTIVITY AT NORMAL INCIDENCE (dB)

Model

Absorber

Height

in. (mm)

Walkway

Overall

 Height

in.

Weight

 lbs. (kg)

Walkway

(2.5 x)

Tips

per

Piece

Reflectivity (dB) at Frequency (GHz)

.08

.12

.3

.5

1

3

6

10

18

*36

*50

                               

SFC-3

3.0 (76)

6.3

2.9 (1.3)

256

          26

32

39

45

50

50

SFC-4

4.3 (109)

7.3

3.0 (1.4)

144

 

 

 

 

 

30

35

42

50

50

50

SFC-6

6.0 (152)

9.0

3.5 (1.6)

100

 

 

 

 

 

32

40

45

50

50

50

SFC-8

8.0 (203)

11.0

4.5 (2.0)

64

 

 

 

 

30

37

45

50

50

50

50

SFC-12

12.0 (305)

15.0

6.0 (2.7)

36

 

3

13

 27

35

40

45

50

50

50

50

SFC-18

18.0 (457)

21.0

12.0 (5.4)

16

 

6

26

30

37

40

45

50

50

50

50

SFC-24

24.0 (610)

27.0

17.0 (7.7)

9

 7

9

30

35

40

45

50

50

50

50

50

SFC-36

36.0 (914)

39.0

24.0 (10.9)

4

9

15

35

37

42

50

50

50

50

50

50

SFC-40

40.0 (1016)

43.0

39.0 (18)

4

11

16

35

38

43

50

50

50

50

50

50

SFC-48**

48.0 (1219)

51.0

38.0 (17)

2

14

21

35

40

50

50

50

50

50

50

50

SFC-72**

72.0 (1829)

75.0

50.0 (23)

1

26 28

38

45

50

50

50

50

50

50

50

SFC-96

96.0 (2438)

99.0

58 (26.5)

1

28

32

40

44

50

50

50

50

50

50

50

* SFC has been characterized at 36 and 50 GHz, but is not routinely measured at these frequencies.

** SFC-48 and -72 are generally supplied in the "twisted" configuration.

The base of the SFC-48 is 18 x 36" (457 x 914 mm).

The SFC-72 has the standard 24" (610 mm) base.

Absorber Operational Temperature Range: -40° C to +120° C (adhesives or coatings may reduce the range)

 

Permittivity

Reflectivity performance of a walkway is degraded from that of the SFC absorber comprising it, due to reflections from the PVC skin. The degradation becomes more significant with increasing frequency; below 1GHz, the degradation is small, at 10 GHz, reflectivity is limited to about 25 dB, in mm-wave applications, other methods of accessing equipment should be considered, such as removing and replacing absorber before beginning testing.

C-RAM SFC WALKWAY can be made from any grade of the standard SFC absorber, but SFC-24 is the largest standard size. Pieces are generally 24 in x 48 in (610 x 1220 mm), or 24 in x 24 in (610 x 610 mm). Other custom sizes can be made, as well as steps, ramps, and cutouts for pedestals.

TYPICAL REFLECTIVITY (BISTATIC) AT OFF-NORMAL INCIDENCE
(Multiply numbers in chart by dB values in tables above)
Absorber Height
in Wavelengths
Off-normal angle (0° = normal, 90° = grazing)
45° 5 55° 60° 65° 70° 75° 80°
4.0 1.00 0.95 0.86 0.75 0.70 0.60 0.51 0.43
2.0 0.90 0.82 0.74 0.66 0.58 0.49 0.42 0.34
1.0 0.72 0.65 0.58 0.50 0.44 0.37 0.31 0.25
0.5 0.48 0.43 0.37 0.31 0.25 0.20 - -

Cuming High Performance Wedge Absorber

 C-RAM SFC-W

HIGH PERFORMANCE RF ABSORBER

 

WEDGE SHAPED

 

500 MHz - 50 GHz

 

Cuming C-RAM SFC-W Wedge RF Absorber

Data

C-RAM SFC-WEDGE is a series of high performance broadband absorbing materials of wedge configuration. SFC-WEDGE complements the pyramidal SFC product, and is made using the same process and materials.

SFC-WEDGE therefore possesses the same desirable properties, including fire retardancy compliance with NRL-8093 Tests 1, 2 and 3.

C-RAM SFC-WEDGE is designed for use in special applications where energy is directed at very wide angles, as in the case of energy propagation down the taper of a tapered chamber, and on chamber side walls, ceiling and floor in very long and narrow chambers.

The wedge design eliminates backscatter at these high incidence angles.

PHYSICAL CHARACTERISTICS AND
TYPICAL REFLECTIVITY AT NORMAL INCIDENCE (SFC-WEDGE)
Model Height
in.
Weight
lbs.
Wedge Rows
Per Piece
Reflectivity in dB at Frequency (GHz)
0.1 0.3 0.5 1.0 3.0 6.0 10 18 36 50
SFC-4W 4 5 12         27 32 37 45 45 45
SFC-6W 6 8 10         30 37 40 45 45 45
SFC-8W 8 10 8       30 35 45 47 47 47 47
SFC-12W 12 13 6       35 37 45 47 47 47 47
SFC-18W 18 16 4      30 35 45 47 47 47 47 47
SFC-24W 24 22 3   30  35 40 45 48 50 50 50 50
SFC-36W 36 30 2   35 38 42 45 48 50 50 50 50
SFC-48W 48 45 2   35 40 46 48 50 50 50 50 50
Notes:  SFC-W Standard Base Dimensions are 24" x 48", 24" x 24" also available

Cuming Convoluted Microwave Absorber

C-RAM FAC

HIGH PERFORMANCE

BROADBAND

MICROWAVE ABSORBER

 

CONVOLUTED

 

3 GHz - 77 GHz

 

Convoluted EMI Absorber

Data


C-RAM FAC is a series of high performance broadband microwave absorbers, made from light weight, very flexible urethane foam treated with a dielectric lossy material, which also imparts great fire retardancy.

The product meets NRL 8093.

C-RAM FAC is a convoluted product; the front face is rippled or convoluted like an egg carton, the convolutions provide an impedance taper, which is very effective in minimizing front face reflections, especially at higher frequencies.

TYPICAL DIMENSIONS

REFLECTIVITY PERFORMANCE in dB (C-RAM FAC)

Model

Height
in. (mm)

Weight
lb. (kg)

3GHz

6GHz

10GHz

15GHz

30GHz

77GHz

FAC 1.5

1.5 (38)

1 (0.45)

-

20

30

35

40

 

FAC 3.0

3.0 (64)

1.8 (0.82)

20

30

40

45

50

 

FAC 4.0

4.0 (102)

2.3 (1.1)

25

30

40

45

50

 

FAC 5.0

5.0 (127)

2.8 (1.27)

25

30

40

45

50

53


Cuming Outdoor Convoluted Microwave Absorber

 C-RAM RFA (Outdoor)

RFA Absorber Has Been Discontinued

See CFA Absorber Below

 

HIGH PERFORMANCE

BROADBAND

MICROWAVE ABSORBER

 

Convuluted

 

2 GHz - 50 GHz

 

Convoluted EMI Absorbers

Data


C-RAM RFA is a similar convoluted absorber available in various thickness grades. It is made from a large-pore open-cell urethane foam (approx 15 pores/inch).

This open cell structure makes C-RAM RFA ideal for outdoor applications, where rain can drain quickly through the piece, and residual moisture can evaporate quickly.

For optimum resistance to moisture, C-RAM RFA uses a different fire retardancy mechanism. While it is self-extinguishing, this material is not rated to NRL 8093 standards.

TYPICAL DIMENSIONS

REFLECTIVITY PERFORMANCE in dB (C-RAM RFA)

Model

Height
in. (mm)

Weight
lb. (kg)

2GHz

5GHz

10GHz

15GHz

20GHz

50GHz

RFA 075

0.75 (19)

0.5 (.25)

-

12

15

17

18

 

RFA 175

1.75 (45)

0.8 (.35)

12

18

25

28

30

 

RFA 375

3.75 (95)

1.5 (.70)

25

32

37

40

40

 

Cuming Lightweight Convoluted Microwave Absorber

 C-RAM CFA

 

FLEXIBLE FOAM SHEET

 BROADBAND MICROWAVE ABSORBER

 

Convuluted

 

2 GHz - 85 GHz

 

Cuming C-RAM CFA Absorber 

 

Data

C-RAM® CFA is a series of lightweight, flexible, multilayered, carbon loaded broadband RF absorber sheet material.

The front surface of the material has a shallow convoluted shape.

It is designed to provide typically -20 dB reflectivity reduction in a frequency range based on the material grade.

The product is flexible enough to conform to moderately contoured surfaces, and can readily be cut with a saw or electric knife to complex shapes.

C-RAM® CFA is used for reducing reflections inside anechoic chambers, radomes, around antennas, inside test boxes and for modifying antenna radiation patterns.

TYPICAL DIMENSIONS

REFLECTIVITY PERFORMANCE in dB (C-RAM CFA)

Model

Height
in. (mm)

Weight
lb. (kg)

2GHz

2.5GHz

3.5GHz

4.5GHz

10GHz

50GHz

85GHz

CFA 19

0.75 (19)

1.25 (.57)

-

-

-

20

20

20 20

CFA 30

1.13 (29)

1.75 (.8)

-

-

20

20

20

20 20

CFA 60

2.25 (57)

3.3 (1.5)

-

20

20

20

20

20 20
CFA 115 4.5 (114) 6.5 (2.95)

20

20

20

20

20

20 20


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