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RF & Microwave Absorber
     

Cuming Pyramidal EMI Absorbers

PPG Cuming Microwave Logo 

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.

A Complete Line of EMI Absorbers and EMI Suppression Materials

 

 

ROHS 

 

Very High Performance Pyramidal Absorber

Picture

Model

Features

Very High Performance Pyramidal RF Absorber 

C-RAM SFC HP

 

VERY HIGH PERFORMANCE BROADBAND RF ABSORBER

 

PYRAMIDAL

 

120 MHz - 50 GHz

 

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.

HP Absorber Performance

Absorber Off Angle Performance

 

 

High Performance Pyramidal & Walkway Absorber

Picture

Model

Features

Very High Performance Pyramidal EMI Absorber

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

C-RAM SFC

 

HIGH PERFORMANCE BROADBAND RF ABSORBER

 

PYRAMIDAL

 

120 MHz - 50 GHz

 

Data

 

PSA

 

Velcro

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

 

Old Style Pyramidal Absorber

Outdoor Pyramidal Absorbers

C-RAM SFC-ODP

 

HIGH PERFORMANCE BROADBAND RF ABSORBER FOR OUTDOOR USE

 

PYRAMIDAL (Outdoor)

 

120 MHz - 50 GHz

 

Data

 

PSA

 

Velcro

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.

Walkway Absorber

C-RAM SFC-WW

 

HIGH PERFORMANCE BROADBAND RF ABSORBER

 

WALKWAY

 

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.

Cuming Walkway Absorber for Turntable (Click to Enlarge)

C-RAM SFC  PYRAMIDAL & WALKWAY PHYSICAL CHARACTERISTICS

TYPICAL REFLECTIVITY AT NORMAL INCIDENCE (dB)

Model

Absorber Height
in. (mm)

Walkway

Overall Height

in.

Weight lb. (kg)

 

Walkway  (2.5 x below)

Tips /
Piece

Absorption (dB) at Freq. (GHz)

.08

.12

.3

.5

1

3

6

10

18

*36

*50

SFC-3 3.0 (76) NA   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

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.

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.

 

 

Permittivity 

 

High Performance Wedge Absorber

Picture

Model

Features

Cuming C-RAM SFC-W Wedge Absorber

C-RAM SFC-W

 

HIGH PERFORMANCE RF ABSORBER

 

WEDGE SHAPED

 

500 MHz - 50 GHz

 

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 PHYSICAL DATA

TYPICAL REFLECTIVITY AT NORMAL INCIDENCE (dB)

 

Convoluted Microwave Absorber

Picture

Model

Features

Convoluted EMI Absorber

C-RAM FAC

 

HIGH PERFORMANCE

BROADBAND 

MICROWAVE ABSORBER

 

CONVOLUTED

 

3 GHz - 77 GHz

 

Data 

 

PSA

 

Velcro

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 (dB)

Model

3GHz

6GHz

10GHz

15GHz

30GHz

77GHz

Height
in. (mm)

Weight
lb. (kg)

FAC 1.5

-

20

30

35

40

 

1.5 (38)

1 (0.45)

FAC 3.0

20

30

40

45

50

 

3.0 (64)

1.8 (0.82)

FAC 4.0

25

30

40

45

50

 

4.0 (102)

2.3(1.1)

 

Convoluted, Reticulated Foam Absorber

Picture

Model

Features

Convoluted EMI Absorbers

C-RAM

 

RFA (Outdoor)

 

HIGH PERFORMANCE

BROADBAND 

MICROWAVE ABSORBER

 

CONVOLUTED

 

2 GHz - 50 GHz

 

Data 

 

PSA

 

Velcro

C-RAM RFA is a series of RF absorbers optimized for performance at frequencies above 10 GHz. Made from a very uniform, open-cell, small pore urethane foam, C-RAM RFC works wellC-RAM RFA is a series of RF absorbers optimized for performance at frequencies above 10 GHz. Made from a very uniform, open-cell, small pore urethane foam, C-RAM RFC works well up to and above 50 GHz, and meets the fire retardancy requirements of NRL 8093. The material is intended primarily for indoor use in anechoic chambers and other test facilities.

C-RAM RFC is very similar in construction and performance to the analogous convoluted absorber, C-RAM FAC. C-RAM RFC would be used when air flow through the piece is required, such as over an air duct, or for cooling air in a high power application.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.

TYPICAL DIMENSIONS AND REFLECTIVITIES (dB)

OF C-RAM RFC

TYPICAL DIMENSIONS AND REFLECTIVITIES (dB)

OF C-RAM RFA

 

Cuming 

     

 
   

 

 

 Last Updated: February 16, 2017

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An Electro Mechanical Research and Development (EMRAD) Corporation, Company

 
     
 

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