WG8 N 1673 Late DIN comment to FCD Ballot ISO/IEC /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 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 Reasoning (1) Definition of additional smaller antenna Classes requires extended operating field strength range. ¬H max value up to 18 A/m (rms) to be generated by Test PCD assembly Power dissipation at Rext may get critical high!

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

Page 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 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 % for new assembly d [m] k(d, r = 0) [%]

Page 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 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 mm 2 ¬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 New calibration coil 2 (2) New Figure

Page 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 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. ValueUnitRemarks C1a100pFVoltage range 200 V C1b4.7pFVoltage range 200 V C2270pFVoltage range 200 V C368pFVoltage range 200 V C42-27pFVoltage range 200 V R ext 2,7ΩPower range 20 W

Page 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.

Page 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] H(d, r) H(d, 0)

Page 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 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]