ANT-1356M【PDF 1/6 页】ANTENNA RFID COIL 13.56MHZ

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ib technology

Data Sheet

ANTENNA_1356.PDF

6 Pages

Last Revised 18/02/08

Micro RWD MF (Mifare) Antenna Specification

The MicroRWD MF (Mifare) module has been designed to interface to a simple high Q

antenna coil of around 1uH inductance together with some capacitor and resistor

components. The antenna coil and passive components form the “tuned” RLC (Resistor-

Inductor-Capacitor) circuit, which is designed to resonate at the 13.56 MHz carrier

frequency and have a Q factor of 35-40. For the 125 kHz family of MicroRWD

modules, the low Q antenna (700uH) has a relatively wide tolerance of inductance so

the capacitor components are fixed and mounted on the RWD module itself – pins AN1

and AN2 connect to an external antenna coil directly. For the 13.56 MHz MicroRWD

modules, the antenna Q is higher and the inductance tolerance is narrow. For this reason

the capacitor components are external to the module to allow fine-tuning and adjustment

of the LC circuit as shown below. The external resistors are used to limit the antenna

current and correct the antenna Q to 35-40 range.

Approx 3cm max

MicroRWD

65mm diameter coil, 2 turns 0.45mm diameter

Enamelled Cu wire (26 SWG), approx 1uH

C1 = 22pF

AN1 (pin 9)

5-50pF trimming

capacitor

Rext

C3 = 220pF

GND (pins 7/13)

C4 = 220pF

AN2 (pin 12)

Centre tap not required

for simple antenna

Rext

typically < 0.5R

C2 = 22pF

All capacitors ceramic 50v minimum

NPO/COG types +/- 5% or better

Directly connected antenna arrangement

For maximum range and performance the following factors should be considered:

1) Maximum range and coupling between transponder and RWD is based on the ratio

of their antenna diameters. Very approximately the RWD antenna loop diameter

should be 2-3 times the diameter of the transponder coil. The basic method of

communication is via magnetic flux linkage (like an air-cored transformer) so the

more lines of flux that intersect the transponder coil, the better the overall

performance. For ISO card transponders there is little benefit in using an RWD

antenna larger than 10cm diameter. Circular antenna coils generally give a more

uniform flux distribution

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