13.56MHz NFC Tag Design

1. Design

1) Card type design: 47x80mm max.

2) Button type design: 20mm dia. max.

3) Miniature rectangular: 9x23mm dia. max.

4) Miniature circular: 6-10 mm dia. max.

if necessary use a magnetic film backing

line width = 0.2 –1.0 mm

line gap = same as line width

2. Materials

Plastic backing: thickness = 0.075-0.125 (0.1mm)

PVC: er = 3.0, tand = 0.01

PET: 3.0, 0.005 (SKC, Korea)

PI: 3.4, 0.002

polyester (Mylar): 3.2, 0.005

PEI (Ultem): 3.2, 0.001

PEN: 3.2, 0.005

http://members.tm.net/lapointe/Plastics.htm

Conductor: silver gravure inks (PG-007, Paru Co.): resistivity = 50 micro-ohm cm, thickness = 0.010mm

Magnetic material:

mur = 95, tand(m) = 0.01, thickness = 0.1mm (3M AB5012)

mur = 175, tand(m)=0.001, thickness = 0.1mm (3M AB5010RF)

3. Design information

- Tag IC connected to the coil

- Tag IC equivalent circuit

- Coil equivalent circuit

- Tag equivalent circuit with parasitics of connection included

- Internal capacitance

1) NXP chips

17pF, 50pF

2) Microchip

Realize 1.40uH, 2.76uH, 4.59uH inductors without external capacitor

- NXP chip dimensions

[Existing Tag Designs]

1. Card Type

- TNP (Taiwan)

- 유비터치

- Infineon Technologies AG:

Coil on Module package technology

eID card

RF link between the chip module and the card coil

2. Button shape

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3. Miniature

Murata Magicstrap: smallest NFC tag