Nfc transmission module antenna and rf design guide. There are two pins. Way to design an nfc antenna for the pn7120chip. 2 rf interface figure 6. To tune the antenna and calculate the correct values for the components the following document is used.
It reviews basic electromagnetic theories on antenna coils a procedure for coil design. The efficient transfer of energy from the reader to the tag depends on the loop antenna tuned to the carrier frequency usually 1356 mhz. Nfc transmission module antenna and rf design guide an144511 from nxp semiconductors. How to design a 1356 mhz customized antenna for st25 nfc rfid tags.
Introduction nfc tag host rf if tag antenna control logic non volatile memory serial if rw this guide provides how to design the antenna to be connected to the nfc tag lsi. We would like to show you a description here but the site wont allow us. The application note will provide the required understanding to design application specific antennas and dimensioning rf parts to achieve the best performance for a communication according. Rf interface module the rf communication interface is based on the iso14443b specification.
The antenna connection is the interface from the rf module to the outside world. Nfc tag antenna design guide 3 11 purpose of this guide 1. It also explains how to determine the tuningmatching network to place between this antenna and the pn7120. The tag and reader antennas are inductances mutually coupled by the magnetic field similarly to a voltage transformer see figure 1.
Device on the rf side the dynamic nfc tag chip needs to be connected to an external antenna to operate. This application note is intended to give a practical guide to design and dimension antennas and rf parts for contactless reader as well as nfc devices. Figure 1 shows an outline of the system using an nfc near field communication tag. This section is written for rf coil designers and rfid system engineers.
Standalone antenna performances evaluation and final rf system validation pn7120 tuningmatching network nfc antenna within its final environment are also covered by this document. The st25 nfc near field communication and rfid radio frequency identification tags extract their power from the reader field. Nfc transmission module antenna and rf design guide 11 144511 on request rf amplifier for nxp contactless nfc reader ics 22 142522 on request windows hardware abstraction layer hal software development kit sdk for nxp nfc ic pn531 usbserial pn532 serial pn51x serial. The efficiency of the voltage transfer can be increased significantly with high q circuits.
Its impedance matches the device internal tuning capacitance value c. In the reader antenna coil is transferred to the tag antenna coil and vice versa. This document describes in detail the properties of the antenna for the pn532 chip.