Datasheet

110
www.lairdtech.com
111
www.lairdtech.com
EMI ESSENTIALSEMI ESSENTIALS
RFRET 4000 RETICULATED
FOAM ABSORBERS
RFRET 4000 is a reticulated foam absorber. Reticulated
foam is an urethane-based foam with a well-dened
open-cell structure. The cell size can be chosen to
optimize penetration of the conductive coating to
which it is adhered. Laird uses two separate processes
to produce its reticulated foam absorber. This unique
spray process applies a coating that is graded through
the thickness of the foam. The grading of the coating also
produces an electrical grading that results in a material with
excellent broadband reectivity reduction.
APPLICATIONS
RFRET broadband foam is commonly used around
antennas to provide isolation or side lobe reduction.
It can be die-cut into components for EMI reduction
inside microwave cavities and is used to manufacture
antenna hats and test boxes. It can be encapsulated
into a textile cover for use outdoors and fabricated into
blankets, covers and other components. Recently, it has
been used for a combination air/EMI lter in networking
equipment. The product can be made UL 94 HF1 for such
applications.
2 4 6 8 10 12 14 16 18
0
-5
-10
-15
-20
-2
-30
-35
TYPICAL PHYSICAL PROPERTIES
Size
4106 24” x 24”
4106 -.25 12” x 12”
4106 - S 4” x 6”
Thickness 0.50” nominal
Weight .092 lb/sq ft
Temperature Maximum 250 °F
Color Gray
Environmental
Withstands intermittent
exposure to water
without degradation
Reection Loss (dB)
Frequency (GHz)
Q-Zorb Typical reectivity performance
P/N 4106
Q-ZORB
®
3000 HP (HIGH PERMEABILITY)
ABSORBERS CA-19
Q-Zorb 3000 HP product line utilizes special shaped
magnetic llers in a polymeric binder to produce thin
sheets with excellent low frequency performance. The
product has very high permeabilities along with low
frequency magnetic loss. This allows relatively thin
sheets of material to perform at frequencies below 2
GHz. CA 19 comes in thickness ranges of .006” .15
mm to .020” .5 mm. and is very exible. The product is
available in rolls 13” wide and any length available. It
can be die cut into specic shapes and is supplied with a
pressure sensitive adhesive backing for ease of use.
Two standard part numbers of Q-Zorb 3000 are
available in the absorber sample kit. This allows the
engineer to see if this product will help solve any
specic EMI problem.
APPLICATIONS
Q-Zorb 3000 is used in situations where low frequency
(< 2 GHz) noise problems are occurring. Some
applications include:
• Die cut components placed in microwave cavities
• Place on top of noisy chip to reduce emissions
• Wrapped around cables to reduce conducted
emissions
• Used inside of board level shields to improve
shielding performance
0.05 0.35 0.64 0.94 1.23 1.53 1.82 2.12 2.41 2.71 3.00
R Loss (dB)
Frequency (GHz)
Reective Loss
0.15 mm
Thickness
0.50 mm
0
-0.5
-1.0
-1.5
-2.0
-2.5
-3.0
-3.5
-4.0
-4.5
-5.0
TYPICAL PHYSICAL PROPERTIES
Size
3535 .006” x 12” x 13”
3535-S .006” x 4” x 6”
3536 .020” x 12” x 13”
3536-S .020” x 4”x 6”
Permeability μ’ (1 MHz) 37
Electrical resistivity (Ω /□) 6 x 10
10
Specic gravity 3.1
Tensile strength (MPa) 1.9
Hardness (Durometer A) 70 ± 10%
Thermal conductivity
(W / mk)
1.0
Flammability UL94 V-0