Microwave Absorber
Board Level Shield
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Microwave Absorber Board Level Shield
Laird Technologies Microwave Absorber Board Level Shields (ABLS)
technology for EMI shielding solutions utilizes a combination of Q-
Zorb RFSW surface wave absorbers and board level shields to create
a product design to meet specific application requirements.
Q-Zorb RFSW surface wave absorbers are thin, magnetically loaded
elastomeric sheets designed to provide emi protection at high
angles of incidence for surface wave attenuation.
Board level shields provide isolation of board level components,
minimizes crosstalk and susceptibility without impacting system
speed. This combination product incorporates a stamped metal
housing and an absorbing elastomer that is designed to meet the
specific needs of your application.
Features and Benefits:
• ABLS has enhanced shielding effectiveness at frequencies
from 1 – 40 Ghz
• Use inside of microwave housings to reduce internal resonance and
lower the "Q" of the microwave cavity
• Minimizes crosstalk and susceptibility without impacting system speed
• Effective in isolating antennas from ground plane reflections
• Custom shapes and other material options are available
• Provides isolation of board level components
• Low height down to 0.04” (1,0mm) to accommodate
mother/daughter board configurations
• Secure cover design is ideal for applications that could be subject to
shock and vibration
Applications
• Any application requiring board level shielding
• Wireless handsets, PC cards
• High frequency communications equipment, basestations
• PDAs
• Desktop and laptop computers
For sales information:
In Asia please telephone +86 755 2714 1166
In Europe please telephone +49 8031 2460 0
In the USA please telephone +1-800-843-4556
or visit:
www.lairdtech.com
• Portable and non-portable electronic devices
Engineered antenna, emi, telematics and thermal applications
Microwave Absorber
Board Level Shield
Microwave Absorbers
Q-Zorb RFSW surface wave absorbers are thin, magnetically loaded elastomeric sheets
designed to provide attenuation at high angles of incidence for surface wave attenuation.
They are nominally manufactured in the thickness range of 0.010” to 0.125” (0.4mm to
3.2mm).
The elastomeric-based absorbers are available in a variety of choices. All of the parts
utilized in our ABLS product offering utilize our silicone elastomer which has a wide
temperature range (-60
O
F – 350
O
F).
Each of these products offers a UL-V0 rating and is RoHS compliant.
In the ABLS product offering, the absorber material is acting to reduce internal resonances
which often occur at higher frequencies. Although the data listed below shows electrical
performance from 2-18 GHz, the material offers shielding effectiveness from 1-40 GHz.
Material Options
Part
Number
2960
2234
2236
2238
2296
2240
2257
2272
2242
Product
Category
RFSW
RFSW
RFSW
RFSW
RFSW
RFSW
RFSW
RFSW
RFSW
Elastomer
Type
Silicone
Silicone
Silicone
Silicone
Silicone
Silicone
Silicone
Silicone
Silicone
Thickness
in (mm)
0.010” (0.3)
0.020” (0.5)
0.030” (0.8)
0.040” (1.0)
0.050” (1.3)
0.060”(1.5)
0.080” (2.0)
0.100” (2.5)
0.125” (3.2)
Frequency (GHz)
Range
12-18
12-18
12-18
8-12
8-12
8-12
4-8
2-4
2-4
Typical Material Performance
0
-5
Reflection Loss (dB)
Standard Surface Mount Shields Two-Piece
Two-piece board level shields offer users the flexibility to inspect or repair shielded
components without having to risk board damage by removing the entire shield or incur
any tooling costs. Covers snap on and off with ease, which makes repair of the component
under the shield quicker and easier and reduces board re-work. Two-piece shields are
available unassembled*, and are designed to survive drop, shock and no-rattle tests.
*Pre-assembly is an option. Consult Sales.
Typical Reflection Loss Properties of Q-Zorb
6
8
10
12
14
16
18
2
4
-10
-15
-20
-25
-30
2234
Frequency (GHz)
Standard Two-Piece Board Level Shields
Part
Number
BMIS-201-F
BMIS-202-F
BMIS-203-F
BMIS-204-F
BMIS-205-F
BMIS-206-F
BMIS-209-F
BMIS-210-F
Surface
Area
.253
2
(163.10
2
)
.402
2
(259.21
2
)
1.033
2
(666.16
2
)
1.548
2
(998.56
2
)
1.461
2
(942.50
2
)
1.879
2
(1212.392)
2.997
2
(1933.36
2
)
2.080
2
(1342
2
)
Overall
Dimension
.538 x .476
(13.66 x 12.10)
.650 x .650
(16.50 x16.50)
1.032 x 1.032
(26.21 x 26.21)
1.260 x 1.260
(32.00 x 32.00)
1.500 x 1.000
(38.10 x 25.40)
1.450 x 1.326
(36.83 x 33.68)
1.747 x 1.747
(44.37 x 44.37)
1.732 x 1.201
(44.02 x 30.50)
Overall
Frame
.100
(2.54)
.142
(3.60)
.200
(5.08)
.236
(6.00)
.236
(6.00)
.200
(5.08)
.384
(9.75)
.118
(3.00)
32 mm
44 mm
44 mm
56 mm
56 mm
56 mm
56 mm
24 mm
32 mm
36 mm
44 mm
40 mm
56 mm
40 mm
700
300
225
250
300
120
450
0.5 g
1.0 g
1.6 g
1.6 g
1.5 g
3.2 g
1.0 g
0.4
0.8
1.1
1.1
1.3
3.1
2.6
Tape
Width
24 mm
Tape
Pitch
20 mm
Parts
Per Reel
1000
Weight
(FR)
0.3 g
Weight
(CY)
0.2
2238
2240
2016
2960
*Please consult sales and order the standard shield part number (BMIS-XXX-X) and note
the addition of the absorber part number (XXXX).
Any information furnished by Laird Technologies and its agents is believed to be accurate and reliable. Responsibility for the use and application of Laird Technologies materials rests with the end
user since Laird Technologies and its agents cannot be aware of all potential uses. Laird Technologies makes no warranties as to the fitness, merchantability, or suitability of any Laird Technologies
materials or products for any specific or general uses. Laird Technologies shall not be liable for incidental or consequential damages of any kind. All Laird Technologies products are sold pursuant
to the Laird Technologies domestic terms and conditions of sale in effect from time to time, a copy of which will be furnished upon request.
EMI-SPEC-MICRO-ABSORBLS-0706
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