WG 8 N 1673 Test PCD Assembly for

WG 8 N 1673 Test PCD Assembly for Additional (Small) Antenna Classes Reasoning, Requirements and Definitions Late DIN comment to FCD Ballot ISO/IEC 10373 -6/FPDAM 8 = WG 8 N 1638 (SC 17 N 3836) Source: Infineon Technologies, NXP Semiconductors Berlin, April 2010

Table of Contents n Reasoning n Requirements ¬ Coupling factor ¬ Homogenous field area n Definitions ¬ Calibration coil 2 ¬ Test PCD antenna 2 tuning ¬ Test PCD assembly 2 n Conclusion 10/31/2021 Page 2

Reasoning (1) n 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 n Power dissipation at Rext may get critical high! 10/31/2021 Page 3

Reasoning (2) n 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 H(d= 37. 5 mm, r) [A/m] r [m] 10/31/2021 Page 4

Reasoning (3) n Low Bit rate Test PCD Assembly ¬ Rant = 1 Ohm ¬ -> Change Power Range from 10 W to 15 W n 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 10/31/2021 Page 5

Requirements (1) n Coupling factor between new small Test PCD antenna and PICC antenna of supported Classes shall be less than for current configuration. n Coupling factor of current configuration ¬ PICC antenna coil = Reference PICC ¬ k = 5. 5 % ¬ Target: k < 5. 5 % for new assembly k(d, r = 0) [%] d [m] 10/31/2021 Page 6

Requirements (2) n 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. n Definition of new smaller calibration coil for field strength determination with Class 4 area. 10/31/2021 Page 7

New Calibration coil 2 (1) n 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 n. H 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 m. V (peak-to-peak) per A/m (rms)]. 10/31/2021 Page 8

New calibration coil 2 (2) n New Figure 10/31/2021 Page 9

New Test PCD antenna 2 (1) n The test PCD antenna 2 shall have a diameter of 100 mm and its construction shall conform to following drawings. 100 mm Antenna coil Ground compensation coil 10/31/2021 Page 10

New Test PCD antenna 2 (2) n New test PCD antenna 2 matching for Bit rates fc/128 to fc/16 n Same quality factor (Q ≈10) as with high Bit rate antenna, inductance approx. 300 n. H. 10/31/2021 Value Unit Remarks C 1 a 100 p. F Voltage range 200 V C 1 b 4. 7 p. F Voltage range 200 V C 2 270 p. F Voltage range 200 V C 3 68 p. F Voltage range 200 V C 4 2 -27 p. F Voltage range 200 V Rext 2, 7 Ω Power range 20 W Page 11

New Test PCD assembly 2 (1) n 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. 10/31/2021 Page 12

New Test PCD assembly 2 (2) n Area of homogenous field: H(d, r) H(d, 0) d = 37. 5 mm, 150 mm antenna r [m] 10/31/2021 H(d, r) H(d, 0) d = 23 mm, 100 mm antenna r [m] Page 13

New Test PCD assembly 2 (3) n Coupling factor ¬ PICC antenna coil = Reference PICC 4 (Class 4) k(d, r = 0) [%] -> k < 5. 5 % achieved! 10/31/2021 d [m] Page 14

Conclusion n 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. H(d= 23 mm, r) [A/m] r [m] ¬ Small Test PCD assembly always with Sense coils 2 ¬ Use of Small Test PCD assembly for Class 4, Class 5 and Class 6 10/31/2021 Page 15