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Flexible Absorbent Material (FAM)

Feature

  • Provide effective EMI suppression in a wide frequency range (10MHz to 18GHz)
  • Ultra thin and extremely flexible, can be freely arranged in space
  • Non-conductive adhesive backing (UL Recognized) available
  • Effective in preventing resonance and suppressing coupling
  • High surface resistance (106 -109 ohms)
  • Easy and fast to process
  • Can be cut any shape easily

Application

  • Notebooks, PCs, workstations
  • LNBs for satellite systems
  • Mobile communications equipment
  • Base Stations for mobile phones and PHS
  • Peripheral devices for computers
  • Wireless equipment
  • Mobile Phones, PHS
  • High speed clocks
  • RFID (Radio Frequency Identification) systems
  • NFC (Near field communication)
  • Wireless Charger

Application for RFID

Besides the application of EMI, FAM can be a solution for RFID on metal also. It suitable for LF(125KHz) and HF(13.56MHz) bands. It can deal with the malfunction problems when RFID Reader/Writer or RFID tag attached on metal (recover maximum 80% efficiency of the original distance). By this way can save more space from RFID to metal.

RFID reader

Thermal Gap fillers

RFID tag only

RFID tag + metal

RFID tag + FAM + metal

100% original distance 5% max original distance 80% max original distance

 

msds rohs sample

Material List :
Property Unit FAM1 FAM3 FAM5 Test Method

Operating Temperature

-40 ~ +85

-40 ~ +85

-40 ~ +85

-

Applicable Frequency

GHz

0.01 - 8

0.1 - 18

0.01 - 18

-

Magnetic Inductivity (μ’@1MHz)

-

25

50

115

-

Material

-

Magnetic Particles + Rubber

Magnetic Particles + Rubber

Magnetic Particles + Rubber

-

Thickness Range

mm

0.12 - 2.50

0.25/0.50/0.75

0.05 - 0.50

-

Max. Dimension

mm

400 x 400

400 x 400

210 x 297(A4)

-

Surface Resistance

ohm

106

109

106

ASTM D257

Tensile Strength

Kgf / cm²

25

101

30

ASTM D412

Thermal Conductivity

W / mK

1.2

1.3

0.5

ASTM D5470

Specific Gravity

g / cm³

3.6

4.8

2.7

ASTM D792

RoHS Compliance

-

2002/95/EC

2002/95/EC

2002/95/EC

-

Halogen-Free

-

No

No

Yes

-

Material List :
Property Unit FAM7 FAM8 Test Method

Operating Temperature

-30 ~ +120

-30 ~ +120

-

Applicable Frequency

GHz

0.01 - 1.0

0.01 - 1.0

-

Magnetic Inductivity (μ’@1MHz)

-

140

450

-

Material

-

Firing Ferrite Core

Firing Ferrite Core

-

Thickness Range

mm

0.08/0.12

0.12/0.22

-

Max. Dimension

mm

130 x 130

130 x 130

-

Surface Resistance

ohm

109

109

ASTM D257

Tensile Strength

Kgf / cm²

-

-

ASTM D412

Thermal Conductivity

W / mK

-

-

ASTM D5470

Specific Gravity

g / cm³

3.8

3.8

ASTM D792

RoHS Compliance

-

2002/95/EC

2002/95/EC

-

Halogen-Free

-

Yes

Yes

-

Item 0.9 GHz 1.8 GHz 2.4 GHz Application Examples

FAM1

0.20mm

-0.22dB ( 4.9%)

-0.35dB ( 7.7%)

-0.50dB (10.9%)

[Shielding Box]
[Power Supply]
[Mobile Phone]
[GPS] [Battery]
[IC] [NB] [NFC]
[RFID tag/reader] [Wireless Charger]

0.25mm

-0.40dB ( 8.8%)

-0.63dB (13.5%)

-0.84dB (17.6%)

0.33mm

-0.90dB (18.7%)

-1.25dB (25.0%)

-1.56dB (30.2%)

0.60mm

-1.32dB (26.2%)

-1.49dB (28.9%)

-1.75dB (33.2%)

1.0mm

-1.70dB (32.7%)

-2.35dB (41.8%)

-3.04dB (50.3%)

1.5mm

-2.51dB (43.9%)

-3.32dB (53.4%)

-3.85dB (58.8%)

2.0mm

-3.31dB (53.3%)

-4.21dB (62.1%)

-4.66dB (65.8%)

2.5mm

-4.46dB (64.2%)

-5.79dB (73.6%)

-5.64dB (73.4%)

FAM3

0.25mm

-0.25dB ( 5.6%)

-0.57dB (12.3%)

-0.90dB (18.7%)

[Mobile Phone] [NB]
[RFID tag/reader] [NFC] [Wireless Charger]

0.50mm

-0.46dB ( 9.9%)

-0.88dB (18.3%)

-1.32dB (26.2%)

0.75mm

-0.97dB (20.0%)

-1.42dB (27.9%)

-2.20dB (39.7%)

FAM5

0.05mm

-0.21dB ( 4.7%)

-0.50dB (11.0%)

-0.84dB (17.8%)

[Shielding Box] [GPS]
[Power Supply] [IC]
[Mobile Phone] [NB]
[Battery] [NFC]
[RFID tag/reader] [Wireless Charger]

0.10mm

-0.46dB ( 9.9%)

-0.88dB (18.3%)

-1.10dB (22.6%)

0.20mm

-0.62dB (13.4%)

-1.05dB (21.8%)

-1.40dB (27.4%)

0.30mm

-0.76dB (16.2%)

-1.20dB (24.2%)

-1.70dB (32.4%)

0.50mm

-1.10dB (22.6%)

-1.50dB (29.0%)

-2.30dB (40.9%)

*Test result will vary when different application.
Thermal Gap pads Item FT0302 FT0504 FT0705 FT0906 FT1107 FT1309 FT1510

OD(mm)

3.0

5.0

7.0

9.0

11.0

13.0

15.0

ID(mm)

2.0

4.0

5.0

6.0

7.0

9.0

10.0

Return Loss – Frequency :

Return Loss (dB)

0.5

1

2

3

4

5

6

7

8

9

10

20

30

Absorb Rate (%)

11

21

37

50

60

69

75

80

86

89

90

99

99.9

FAM1 (0.2 - 0.6mm) FAM1 (1.0 - 2.5mm) FAM3 (0.25 - 0.75mm) FAM2
Ceramic Heat Spreader Non-silicone Thermal Pad Thermal Adhesive Tape LED Thermal Pad
Examples for Sheet Shape :

Wrap around cable

Apply to flat cable

Apply to IC top

Apply between ICs

Apply to case and between boards

Flexible Absorbent Material Flexible Absorbent Material Flexible Absorbent Material Flexible Absorbent Material Flexible Absorbent Material

 

 

Test Example : Notebook + FAM ( before and after)*mouse over

MCPCB Thermal Pad
Thermal Paste Thermal Compound Manufacturer

 

LF/HF RFID on-metal application :

When RFID tag or RFID reader/writer attached on metal surface, the read distance will become much shorter than expect. The traditional design is to increase the space between RFID antenna and metal but cause the RFID device with a big thickness. FAM can be a solution to improve the read distance for LF (125/134.2KHz) and HF (13.56MHz) bands. After insert FAM between RFID antenna and metal surface, the read distance can recover maximum 80% efficiency than the original distance with no metal. Due to FAM with small thickness, a slight figure can be designed easily than before.

FAQ :

Q1 : How to use FAM for an RFID tag?
A1 : Attach FAM with antenna / inlay tightly and embed into any shape as you need. When the tag attached on metal surface, please use FAM side, not antenna side.

 

Q2 : How to use FAM for an RFID reader/writer?
A2 : Insert FAM between reader’s antenna area and circuit board tightly to get a compact design. When use the reader/writer, please don’t use antenna side to attach the metal surface.

 

Q3 : Can I use FAM for UHF RFID?
A3 : FAM is a kind of magnetic material so it works well in LF/HF RFID (Magnetic- field) but not works in UHF RFID (Electric-field).

 

Q4 : How to choose FAM thickness?
A4 : FAM has standard thickness as page 2. You can test different thickness with your RFID device directly to compare which thickness can get the best distance. It's a fast and easy function to evaluate FAM.

 

Q5 : Why I can’t get a good read distance after using FAM?
A5 : When FAM close RFID device, the inductance in LC circuit will increase and the response frequency will become higher. If your tag’s response frequency is far away reader’s response frequency, the read range will become shorter than before. In such a case, re-design the antenna to adjust L and C to get a reasonable response frequency will be the best function.

 

Q6 : What FAM dimension should I use?
A6 : When FAM cover the whole RFID antenna area can get the best performance.

 

Q7 : How is the performance if I assemble small piece FAM to cover the whole RFID antenna?
A7 : The performance will the same the whole piece FAM.

 

Q8 : Is there any different for FAM two sides?
A8 : FAM is a well mixed material with one single layer design so the two sides are the same.

 

 

Read Distance (Reference) :

ISO
Card

no
metal

on
metal

FAM1

FAM3

FAM5

0.2
mm

0.25
mm

0.33
mm

0.6
mm

1.0
mm

1.5
mm

2.0
mm

2.5
mm

0.25
mm

0.50
mm

0.75
mm

0.05
mm

0.1
mm

0.2
mm

0.3
mm

0.5
mm

Icode2

11

0

5.5

6.5

6.5

8

7.5

7

7

7

6

6.5

7

4.5

8

7

6.5

6

TI 2048

14

0

4

5

5.5

9

7

7

6

6

4.5

8.5

9

5.5

7

7

5.5

5

EM4100

19

4.5

8

9

9.5

12

7.5

5

4

4

9.5

12

9

11

12

4

4

3

*The read distance unit is cm
*Different reader will cause different read distance
Which FAM Is for You?
FAM1 FAM3 FAM5 FAM7 FAM8

Operating Temperature

-40 ~ +85

-30 ~ +120℃

Magnetic Inductivity (μ’@1MHz)

25

50

115

140

450

Material

Magnetic Particles + Rubber

Firing Ferrite Core

Min. Thickness

0.12mm

0.25mm

0.05mm

0.08mm

0.12mm

Max. Thickness

2.5mm

0.75mm

0.5mm

0.12mm

0.22mm

Max. Dimension

400x400mm

400x400mm

210x297mm(A4)

130x130mm

130x130mm

Surface Resistance

106

109

106

109

109

RoHS Compliance

2002/95/EC

Halogen-Free

No

Yes

Best Application

RFID/NFC

EMI RFID/NFC

EMI RFID/NFC

EMI RFID/NFC

EMI