WG8 N 1673

Late DIN comment to FCD Ballot ISO/IEC 10373-6/FPDAM8

= WG8 N 1638 (SC17 N 3836)

Source: Infineon Technologies, NXP Semiconductors

Berlin, April 2010

Test PCD Assembly for Additional (Small) Antenna Classes

Reasoning, Requirements and Definitions

Page 219.04.23

Table of Contents

Reasoning

Requirements

¬ Coupling factor

¬ Homogenous field area

Definitions

¬ Calibration coil 2

¬ Test PCD antenna 2

¬ Test PCD antenna 2 tuning

¬ Test PCD assembly 2

Conclusion

Page 319.04.23

Reasoning (1) Definition of additional smaller antenna Classes requires

extended operating field strength range.

¬ Hmax value up to 18 A/m (rms) to be generated by Test PCD assembly

Power dissipation at Rext may get critical high!

Page 419.04.23

Reasoning (2) Calculation:

¬ 18 A/m (rms) ->Simulation-> Iant = 3.75 A (rms)

¬ Power loss at:

– Rant = 1 Ohm: 14 W

– Rant = 4.7 Ohm: 66 W

0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10

2

4

6

8

10

12

14

16

18

2020

0

H1z xA 0, 0.0375, ( )

0.10 xAr [m]

H(d= 37.5 mm, r)[A/m]

Page 519.04.23

Reasoning (3) Low Bit rate Test PCD Assembly

¬ Rant = 1 Ohm

¬ -> Change Power Range from 10 W to 15 W

High Bit rate Test PCD Assembly

¬ Rant = 4.7 Ohm

¬ Cannot be used for Classes 4, 5, 6

¬ -> New smaller Test PCD assembly antenna required

Page 619.04.23

Requirements (1) Coupling factor between new small Test PCD antenna and PICC

antenna of supported Classes shall be less than for current configuration.

Coupling factor of current configuration

¬ PICC antenna coil = Reference PICC

¬ k = 5.5 %

¬ Target: k < 5.5 % fornew assembly

0 0.01 0.02 0.03 0.04 0.050

1

2

3

4

5

6

7

8

9

10

k% 0 m z02, ( )

37.5 mm

z02d [m]

k(d, r = 0)[%]

Page 719.04.23

Requirements (2) Distance between new small Test PCD antenna and DUT shall be

chosen in a way to maximize homogenous field area at DUT position.

¬ Target: Homogenous magnetic field with an area of Class 4.

Definition of new smaller calibration coil for field strength determination with Class 4 area.

Page 819.04.23

New Calibration coil 2 (1) Coil characteristics

¬ The coil on the calibration coil card 2 shall have one turn. The outer size of the coil shall be 47 mm × 24 mm with corner radius 2 mm. Relative dimensional tolerance shall be ± 2 %.

– NOTE 1 The area over which the field is integrated is approximately 1100 mm2

¬ The coil shall be made as a printed coil on printed circuit board (PCB) plated with 35 μm copper. Track width shall be 500 μm with a relative tolerance of ± 20 %. The size of the connection pads shall be 1,5 mm × 1,5 mm.

– NOTE 2 At 13,56 MHz the approximate inductance is 140 nH and the approximate resistance is 0,3 Ω.

¬ The open circuit calibration factor for this coil is 0,118 V (rms) per A/m (rms) [Equivalent to 333 mV (peak-to-peak) per A/m (rms)].

Page 919.04.23

New calibration coil 2 (2) New Figure

Coil 46 mm × 24 mm1 turn

ISO/IEC 7810 ID-1 outline

Connections

Page 1019.04.23

New Test PCD antenna 2 (1) The test PCD antenna 2 shall have a diameter of 100 mm and

its construction shall conform to following drawings.

Ground compensation coil

Antenna coil

100 mm

Page 1119.04.23

New Test PCD antenna 2 (2) New test PCD antenna 2 matching for Bit rates fc/128 to fc/16

Same quality factor (Q ≈10) as with high Bit rate antenna, inductance approx. 300 nH.

Value Unit Remarks

C1a 100 pF Voltage range 200 V

C1b 4.7 pF Voltage range 200 V

C2 270 pF Voltage range 200 V

C3 68 pF Voltage range 200 V

C4 2-27 pF Voltage range 200 V

Rext 2,7 Ω Power range 20 W

Page 1219.04.23

New Test PCD assembly 2 (1) The sense coils and test PCD antenna shall be assembled

parallel and with the sense and antenna coils coaxial and such that the distance between the active conductors is 23 mm as shown in following figure.

23 mm 23 mm

DUT

Active conductors

Sense coil 2a Test PCD antenna Sense coil 2b

Calibration coil 2

Page 1319.04.23

New Test PCD assembly 2 (2) Area of homogenous field:

d = 37.5 mm, 150 mm antenna d = 23 mm, 100 mm antenna

r [m] r [m]

H(d, r)H(d, 0)

H(d, r)H(d, 0)

Page 1419.04.23

New Test PCD assembly 2 (3) Coupling factor

¬ PICC antenna coil = Reference PICC 4 (Class 4)

-> k < 5.5 % achieved!d [m]

k(d, r = 0)[%]

Page 1519.04.23

Conclusion Power losses of new small Test PCD assembly:

¬ 18 A/m (rms) ->Simulation-> Iant = 2.35 A (rms)

¬ Power loss at:

– Rant = 2.7 Ohm: 15 W -> o.k.

¬ Small Test PCD assembly always with Sense coils 2

¬ Use of Small Test PCD assembly for Class 4, Class 5 and Class 6

r [m]

H(d= 23 mm, r)[A/m]

0 0.02 0.04 0.06 0.08 0.10

2

4

6

8

10

12

14

16

18

20

H1z xA 0, 0.023, ( )

xA