Cuming High Power Honeycomb RF & Microwave Absorber

C-RAM SFC-HC

HIGH POWER

BROADBAND HONEYCOMB

MICROWAVE ABSORBER

PYRAMIDAL

500 MHz - 18 GHz

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/in² of RF energy with a phenolic coated honeycomb.

Phenolic Coating

Air Velocity, ft/min.	Watts/in²
0	10
200	20
300	40
400	60
600	80

Neoprene Coating

Air Velocity, ft/min.	Watts/in²
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)
Model	Absorber Height in. (mm)	Weight lbs. (kg)	Tips / Piece	.08	.12	.3	.5	1	3	6	10	18	20
SFC-HC-3	3 (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

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	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.

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

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 MIL461

RF ABSORBER FOR EMC CHAMBERS

TRUNCATED PYRAMIDAL

MIL-STD 461/462G

RTCA-DO160

EN 1000-4-3

The C-RAM MIL461 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 MIL461 meets the requirements for MIL-STD 461/462G.

C-RAM MIL461, in an appropriate combination in a chamber, are an ideal absorber treatment for Immunity Test Chambers (EN 1000-4-3 and equivalent specifications).

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)
Model	Absorber Height in. (mm)	Weight lbs. (kg)	80	250	500	1K	10K
MIL461	21 (533.4)	14 (6.4)	6	6	>10	>10	>10