Cuming Very High Performance Pyramidal RF & Microwave Absorber

C-RAM SFC HP

VERY HIGH PERFORMANCE BROADBAND RF ABSORBER

PYRAMIDAL

120 MHz - 50 GHz

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)
Model	Height in. (mm)	Weight lbs. (kg)	Tips Per Piece	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 Optional Clean Room Coating (CRC) Meets Class 100,000 (ISO 8) Black Tip Option	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: • NRL Specification 8093 tests 1, 2, and 3 • MS-8-21 tests 1, 2, and 3 • T.I. drawing 2693066 • ASTM E-84-97a, Class A • UL94 rated HF-1 Typically, C-RAM SFC absorbers can handle up to 1.0 W/in² (1.55 kW/m²) of RF energy in a temperature controlled room, but this is dependent upon frequency and application. The product is black throughout, and generally is sprayed with a light blue surface coating, both for cleanliness and to provide better light reflection inside a chamber. The absorber can be left unpainted if requested.

C-RAM SFC-ODP HIGH PERFORMANCE BROADBAND RF ABSORBER FOR OUTDOOR USE PYRAMIDAL (Outdoor) 120 MHz - 50 GHz	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	C-RAM SFC-WW 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	Minimum Reflectivity (dB) at Frequency (GHz)
Model	Absorber Height in. (mm)	Walkway Overall Height in.	Weight lbs. (kg) Walkway (2.5 x)	Tips per Piece	.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	40	50	50
SFC-4	4.3 (109)	7.3	3.0 (1.4)	144						30	35	42	42	50	50
SFC-5	5 (127)	3.2 (1.5)	3.3 (1.5)	144						34	38	40	43	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-72 and -96 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)

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)
Absorber Height in Wavelengths	45°	50°	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

C-RAM SFC-W 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)
Model	Height in.	Weight lbs.	Wedge Rows Per Piece	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

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 Lightweight Convoluted Microwave Absorber

C-RAM CFA

FLEXIBLE FOAM SHEET

BROADBAND MICROWAVE ABSORBER

Convuluted

2 GHz - 85 GHz

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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Cuming Very High Performance Pyramidal RF & Microwave Absorber

Cuming High Performance Pyramidal & Walkway Absorber

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