Micore Reader IC Family; Directly Matched Antenna Design

All formulas on one page

Mifare 4K RFID Cards,NXP Mifare 4k Offset Printing Cards,Mifare 4K Proximity Cards,NXP Mifare 4k Pre-printed cards.

 Antenna design example In the following pages an antenna examples is shown. First of all the antenna coil is designed. In this example a two turns antenna with a rectangular size of 160mm x 180mm is used (one turn per each La and Lb). This coil is measured with an impedance analyzer.

Table 10: Example antenna coil

Inductance and resistance measurement, using an impedance analyzer

  Ls and Rs Ls, Rs, and Cp (resonance equivalent circuit)
L 2.7 µH 2.5 µH
R 1.1 0.95 Ω
C - 4pF

Mifare 4K Proximity Smart Cards,Mifare 4k Blank PVC Cards,NXP Mifare 4K printed cards,RFID Mifare 4K S70 Printing Cards.

Based on these values the tuning procedure is started, including the EMC low pass filter as proposed in section 4.1.2. The resulting circuit is shown in Fig 26, th e component values are shown in Ta ble 11: , and the matching result is shown in Fig 27 .

Mifare Classic 4K S70 Blank White Cards,Mifare Classic 4K S70 Offset Printing Cards,Mifare 4K Proximity Cards,

Fig 26. Example Antenna Circuit

Table 11: Resulting component values of the example antenna
Component Value
L0 1uH (e.g. TDK NL322522T-1R0J)
C02 56pF each (Ceramic NP0, tolerance ≤ ±2%)
C1 12pF each (Ceramic NP0, tolerance ≤ ±2%)
C21 82pF each (Ceramic NP0, tolerance ≤ ±2%)
C22 6.8pF each (Ceramic NP0, tolerance ≤ ±2%)
C3 1nF (Ceramic NP0, tolerance ≤ ±10%)
C4 100nF (Ceramic X7R, tolerance ≤ ±10%)
R1 2.2 kΩ
R1 820Ω
RS 4.7 Ω

Mifare 4K Full Color Offset Printing Cards,Mifare 4K Proximity Smart Cards,NXP Mifare 4K Printed Cards,Mifare 4K Proximity Contactless Cards.

This antenna meets the Q-factor requirements and fulfills the pulse shapes requirements according to [8] , and with a driving current of I TVDD = 112mA and a receive voltage of URxAC = 2.9Vpp at the receive pin an operating distance of approximately 10cm for a typical mifare card can be measured: >12cm (DESfire, fres = 14.6MHz) >10cm (Mifare 1K, fres = 16.5 œ 17MHz) >10cm (2x Mifare 1K, each fres = 16.5 œ 17MHz)

Table 12: Abbreviations
Acronym Description
ATQA Answer To reQuest type A
ATS Answer To Select
BCC Block Check Character (checksum)
CBC Cipher-Block Chaining
fc Carrier frequency (13.56 MHz)
fres Resonance frequency
FSCI Frame Size for proximity Card Integer
PCD Proximity Coupling Device (ISO/IEC 14443 term for reader/writer unit)
PICC Proximity Integrated Circuit Card
PPS Protocol and Parameter Selection
RATS Request for Answer To Select
REQA REQuest type A
RFU Reserved for Future Use
SAK Select AcKnowledge
UID Unique IDentification number

Mifare(14443A) 13,56 MHz RFID Proximity Antennas; Application Note
ISO/IEC 14443 higher bit rates with Micore; Application Note
Data Sheet; SL RC400 I Code Reader IC
MIFARE MF RC500; Highly Integrated ISO 14443A Reader IC
MIFARE MF RC 530 ISO14443A reader IC
MIFARE MF RC531; ISO 14443 Reader IC
MIFARE and I Code CL RC632 Multiple protocol contactless reader IC
ISO/IEC14443 Identification cards – Contactless integrated circuit(s) cards -Proximity cards
ISO10373-6 Identification cards -Test methods part 6: Proximity cards