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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. |
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High
Performance Hollow Pyramidal Absorber
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Model |
Features |
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C-RAM HPA
HIGH PERFORMANCE HIGH POWER RF ABSORBER
HOLLOW PYRAMIDAL
30 MHz - 10 GHz
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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 15 W/in 2
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. |
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TYPICAL PHYSICAL AND REFLECTIVITY CHARACTERISTICS OF C-RAM
HPA
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High
Performance Outdoor Pyramidal Absorber
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Model |
Features |
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C-RAM EVA
HIGH PERFORMANCE HIGH POWER RF ABSORBER
OUTDOOR PYRAMIDAL
120 MHz - 50 GHz
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C-RAM EVA is a series of very high performance pyramidal
absorbers suitable for exterior usage and capable of handling relatively
high power densities. Being a very porous material, C-RAM EVA is used in
anechoic chambers to cover air ducts, thereby reducing RF reflections.
C-RAM EVA is made from a very light, open cell foam with
large cell size of 15 pores/inch. This large pore size allows rainwater to
drain readily, drying quickly after the rain stops. The RF lossy coating on
the foam absorber is not affected by repeated exposure to rain. The large
open cells permit forced air circulation through the material increasing the
power handling capabilities to approximately 10 W/in 2
of RF power . Without forced air cooling,
the material can typically handle 2 W/in2. |
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C-RAM EVA PYRAMIDAL OUTDOOR PHYSICAL
CHARACTERISTICS
TYPICAL REFLECTIVITY AT NORMAL INCIDENCE (dB)
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Model |
Height
in. (mm) |
Weight
lb. (kg) |
Tips /
Piece |
Reflectivity
at Freq. (GHz) |
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.12 |
.3 |
.5 |
1 |
3 |
6 |
10 |
18 |
*36 |
*50 |
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EVA-4 |
4.3 (109) |
3 (1.4) |
144 |
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30 |
35 |
42 |
50 |
50 |
50 |
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EVA-6 |
6 (152) |
3.5 (1.6) |
100 |
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32 |
40 |
45 |
50 |
50 |
50 |
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EVA-8 |
8 (203) |
4.5 (2.0) |
64 |
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30 |
37 |
45 |
50 |
50 |
50 |
50 |
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EVA-12 |
12 (305) |
6 (2.7) |
36 |
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35 |
40 |
45 |
50 |
50 |
50 |
50 |
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EVA-18 |
18 (457) |
12 (5.4) |
16 |
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30 |
37 |
40 |
45 |
50 |
50 |
50 |
>45 |
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EVA-24 |
24 (610) |
17 (7.7) |
9 |
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30 |
35 |
40 |
45 |
50 |
50 |
50 |
50 |
>45 |
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EVA-36 |
36 (914) |
24 (10.9) |
4 |
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35 |
37 |
42 |
50 |
50 |
50 |
50 |
50 |
>45 |
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EVA-40 |
40 (1016) |
39 (18) |
4 |
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43 |
50 |
50 |
50 |
50 |
50 |
50 |
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EVA-48** |
48 (1219) |
38 (17) |
2 |
28 |
35 |
40 |
50 |
50 |
50 |
50 |
50 |
50 |
>45 |
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EVA-72** |
72 (1829) |
50 (23) |
1 |
33 |
40 |
45 |
50 |
50 |
50 |
50 |
50 |
50 |
>45 |
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High Performance
Clean Room RF Absorber
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Picture / Webpage |
Model |
Features |
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C-RAM CFC
HIGH PERFORMANCE RF ABSORBER
CLEAN ROOM
300 MHz - 10 GHz
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C-RAM CFC is a series of high performance broadband RF
absorbers designed for electronic and aerospace clean room applications. The
carbon loaded foam is completely embedded in a clean material, so there is
no dusting or release of conductive particles.
C-RAM CFC is made by embedding the corresponding grade of
C-RAM SFC Pyramidal absorber in a mating section of expanded polystyrene
foam, and sealing the back with a polyvinyl chloride plastic film. The
completed box is sprayed with a light blue antistatic coating, which can be
wiped clean and requires no special vacuuming to maintain clean room
conditions. |
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TYPICAL DIMENSIONS AND REFLECTIVITIES (dB)
OF C-RAM CFC GRADES
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Corner Block (Lossy
Foam) RF Absorber
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Picture / Webpage |
Model |
Features |
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C-RAM CORNER BLOCK
HIGH PERFORMANCE RF ABSORBER
CORNER BLOCK
120 MHz - 50 GHz
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C-RAM Corner Block is a carbon loaded urethane foam material
used to fit anechoic chamber materials, such as C-RAM SFC, into the corners
and edges of the chamber. These products meet all of the fire retardancy
requirements of NRL Specification 8093.
C-RAM Corner Block is made of the same material as the
pyramidal absorber it is being used with. It will have the same density and
impedance as the C-RAM SFC foam. |
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C-RAM CORNER BLOCK PHYSICAL
CHARACTERISTICS
TYPICAL REFLECTIVITY AT NORMAL INCIDENCE (dB)
|
Model |
Height
in. (mm) |
Weight
lb. (kg) |
Reflectivity
at Freq. (GHz) |
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.12 |
.3 |
.5 |
1 |
3 |
6 |
10 |
18 |
*36 |
*50 |
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CB-4 |
4.3 (109) |
3 (1.4) |
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30 |
35 |
42 |
50 |
50 |
50 |
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CB-6 |
6 (152) |
3.5 (1.6) |
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32 |
40 |
45 |
50 |
50 |
50 |
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CB-8 |
8 (203) |
4.5 (2.0) |
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30 |
37 |
45 |
50 |
50 |
50 |
50 |
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CB-12 |
12 (305) |
6 (2.7) |
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35 |
40 |
45 |
50 |
50 |
50 |
50 |
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CB-18 |
18 (457) |
12 (5.4) |
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30 |
37 |
40 |
45 |
50 |
50 |
50 |
>45 |
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CB-24 |
24 (610) |
17 (7.7) |
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30 |
35 |
40 |
45 |
50 |
50 |
50 |
50 |
>45 |
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CB-36 |
36 (914) |
24 (10.9) |
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35 |
37 |
42 |
50 |
50 |
50 |
50 |
50 |
>45 |
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CB-40 |
40 (1016) |
39 (18) |
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43 |
50 |
50 |
50 |
50 |
50 |
50 |
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CB-48** |
48 (1219) |
38 (17) |
28 |
35 |
40 |
50 |
50 |
50 |
50 |
50 |
50 |
>45 |
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CB-72** |
72 (1829) |
50 (23) |
33 |
40 |
45 |
50 |
50 |
50 |
50 |
50 |
50 |
>45 |
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