Flex Suppressor
®
Magnetic Sheet for RFID
Overview
The KEMET Magnetic Sheet for radio frequency
identification (RFID) Flex Suppressor® prevents
interference between a loop antenna and metallic objects
and effectively improves the communication range of RFID.
The flexible sheet is a polymer base, blended with micron-
sized magnetic powders dispersed throughout the material.
These sheets improve the magnetic flux convergence and
can be cut into a variety of shapes and sizes.
Applications
• Cell phone with radio frequency identification (RFID)
function
• Contactless IC card
• RFID reader/writer
• RFID tag
Benefits
• Magnetic flux convergence improvement – increases the
relative permeability (u’) while keeping the magnetic loss
(u”) low.
• Effective carrier frequency 13.56 MHz and below
• Resistant to shock, not brittle
• Thin, flexible material used in portable equipment
• Virtually no limitation in where it can be used
• Less time required for installation
• Easily cut into any shape
• Easily laminates the Flex Suppressor® roll to the tag roll
• RoHS compliant and halogen-free
Sheet Type
Roll Type
One world. One KEMET
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
FS8005_MSR • 9/11/2018
1
Flex Suppressor
®
Magnetic Sheet for RFID
Part Number System
M4
Series Type
(100)-
Thickness
(100)- = 0.1 mm
(200)- = 0.2 mm
(300)- = 0.3 mm
(01)- = 0.1 mm
(02)- = 0.2 mm
(025)- = 0.25 mm
(03)- = 0.3 mm
240 X 240
Standard Dimensions
240 X 240 = Sheet 240 x 240 mm
240 X 20 M = Roll 240 mm x 20 m
240 X 30 M = Roll 240 mm x 30 m
240 X 50 M = Roll 240 mm x 50 m
220 X 185 = Sheet 220 mm x 185 mm
T0800
Adhesive Tape Thickness
M4
RM4A
T0800 = 0.03 mm
Blank = No adhesive tape
Specifications
Features
Series Type
Effective Carrier Frequency
Operating Temperature (°C)
Thickness (mm)
Standard Dimensions (mm)
–40 to +105
0.1/0.2/0.3
240 X 240
(Roll on request)
40 typical
50
40
13.56 MHz
60
50
High Magnetic Permeability &
Low Magnetic Loss Type
M4
13.56 MHz and below
–40 to +85
0.1/0.2/0.25/0.3
220 X 185
50 typical
13.56 MHz
RM4A
Permeability µ
Permeability µ
Permeability at 13.56 MHz
30
40
30
20
10
20
10
0
1
10
Frequency [MHz]
100
1,000
0
1
10
Frequency [MHz]
100
1,000
Specific Gravity
1
Surface Resistivity (Ω/sq.)
Approved Standard
RoHS
Halogen
Environment
PVC
Lead
Red Phosphorus
1
3.1 typical
1.0 X 10
7
typical
UL 94 HB
UL File No. E176124
Compliant
Free
Free
Free
Free
3.6 typical
–
Value in 23°C atmosphere.
Above specifications are for the Flex Suppressor® only (adhesives, etc., not included.)
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
FS8005_MSR • 9/11/2018
2
Flex Suppressor
®
Magnetic Sheet for RFID
Table 1 – Ratings & Part Number Reference
Part Number
Series
Thickness
mm
Tape
Thickness
mm
0.03
--
0.03
--
0.03
--
0.03
--
0.03
--
0.03
0.03
0.03
--
0.03
--
0.03
--
mm
Tape Thickness
Permeability
at 13.56 MHz
40
40
40
40
40
40
40
40
40
40
40
50
50
50
50
50
50
50
at 13.56 MHz
Permeability
Specific
Gravity
Typical
3.1
3.1
3.1
3.1
3.1
3.1
3.1
3.1
3.1
3.1
3.1
3.6
3.6
3.6
3.6
3.6
3.6
3.6
Typical
Specific
Gravity
Surface
Resistivity
Ω/sq. typical
1.0 X 10
7
Weight
g
19.04
3,479.17
3,966.67
33.41
35.75
4,176.25
4,468.75
50.11
52.45
4,175.83
4,370.83
16.31
30.96
29.31
38.29
36.63
45.61
43.96
g
Weight
M4(100)-240X240T0800
M4(100)-240X50M
M4(100)-240X50MT0800
M4(200)-240X240
M4(200)-240X240T0800
M4(200)-240X30M
M4(200)-240X30MT0800
M4(300)-240X240
M4(300)-240X240T0800
M4(300)-240X20M
M4(300)-240X20MT0800
RM4A(01)-220X185T0800
RM4A(02)-220X185T0800
RM4A(02)-220X185
RM4A(025)-220X185T0800
RM4A(025)-220X185
RM4A(03)-220X185T0800
RM4A(03)-220X185
Part Number
M4
M4
M4
M4
M4
M4
M4
M4
M4
M4
M4
RM4A
RM4A
RM4A
RM4A
RM4A
RM4A
RM4A
0.1
0.1
0.1
0.2
0.2
0.2
0.2
0.3
0.3
0.3
0.3
0.1
0.2
0.2
0.25
0.25
0.3
0.3
mm
1.0 X 10
7
1.0 X 10
7
1.0 X 10
7
1.0 X 10
7
1.0 X 10
7
1.0 X 10
7
1.0 X 10
7
1.0 X 10
7
1.0 X 10
7
1.0 X 10
7
1.0 X 10
7
1.0 X 10
7
1.0 X 10
7
1.0 X 10
7
1.0 X 10
7
1.0 X 10
7
1.0 X 10
7
Ω/sq. typical
Surface Resistivity
Series
Thickness
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
FS8005_MSR • 9/11/2018
3
Flex Suppressor
®
Magnetic Sheet for RFID
Applications
Communication disturbance by metal
(degraded communication range)
Effect of magnetic sheet
(improved communication range)
Transmission
distance
increases
IC Card
Transmission
distance
decreases
Magnetic energy
is consumed as
electric current
inside the metal
Functions as magnetism
deflection yoke
Metal part (e.g. case)
FLEX SUPPRESSOR
®
Media
Magnetic field
lines
Loop antenna
Media
Magnetic flux
Reader
Metal
Absorbed
magnetic flux
Magnetic flux
Reader
Magnetic sheet
Metal
Passing
magnetic flux
Devices
Mobile phone
Notebook PC and tablet
RFID card reader/writer
RFID card and tag
RFID Transmission
Quality Improvement
For communication distance
improvement
Application example in a cell phone with RFID function.
Communication distance
enhancement
RFID antenna
FLEX SUPPRESSOR
®
Laminating the Flex Suppressor
®
roll to the tag roll
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
FS8005_MSR • 9/11/2018
4
Flex Suppressor
®
Magnetic Sheet for RFID
Applications (cont’d)
Communication distance evaluation of a cell phone RFID antenna.
RFID
circuit board antenna for mobile
phones ( A b out 4 0 mm × 3 0 mm)
Circ uit b oard antenna only
(in o p en s pac e)
Circ uit b oard antenna with
a met al p late in it s proximit y
RM4A ins t alle d b et ween the
c irc uit b oard an d a met al p late
I S O / I EC
18 0 9 2 c ompat ib le
C ont ac tl es s reader/ wr iter
Mea s urement of the ma ximum
c ommuni c at i on dis t an c e of b oth of
the a b ove (3 l evels)
160
Communication distance (mm)
140
120
100
80
60
40
20
0
Circ uit b oard
antenna only
Circuit board antenna
+ metal plate
Circuit board antenna
+ RM4A + metal plate
* This data does not represent guaranteed values.
© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard
Fort Lauderdale, FL 33301 USA • 954-766-2800 • www.kemet.com
FS8005_MSR • 9/11/2018
5
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