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NBT2000A8K0T4
OPTIGA
Authenticate NBT
™
Antenna design guide
About this document
Scope and purpose
The scope of this document is to provide antenna designers with a set of guidelines for the development of coils
intended for use with the OPTIGA
Authenticate NBT bridge tag devices. It contains information about
™
important electrical parameters as well as some design examples. The recommendations in this document are
for guidance only.
The purpose of this document is to provide product details relevant to designing an NFC antenna to optimize
the contactless performance.
Intended audience
This document is primarily intended for antenna designers who want to understand the principles to design an
antenna for the OPTIGA
Authenticate NBT.
™
User guide
Please read the sections "Important notice" and "Warnings" at the end of this document
Revision 2.1
www.infineon.com
2024-04-26
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Summary of Contents for Infineon OPTIGA Authenticate NBT
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Page 1: About This Document
This document is primarily intended for antenna designers who want to understand the principles to design an antenna for the OPTIGA Authenticate NBT. ™ User guide Please read the sections "Important notice" and "Warnings" at the end of this document Revision 2.1 www.infineon.com 2024-04-26... -
Page 2: Table Of Contents
OPTIGA Authenticate NBT ™ Antenna design guide Table of contents Table of contents About this document ..............1 Table of contents . - Page 3 OPTIGA Authenticate NBT ™ Antenna design guide Table of contents 4.2.3 Resulting design, Class 6 shield antenna ..........21 4.2.4 Verification .
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Page 4: List Of Tables
OPTIGA Authenticate NBT ™ Antenna design guide List of tables List of tables Table 1 Components of the equivalent circuit ........... . . 9 Table 2 PG-USON-8-8 package capacitance . -
Page 5: List Of Figures
OPTIGA Authenticate NBT ™ Antenna design guide List of figures List of figures Figure 1 OPTIGA Authenticate NBT documentation landscape ........6 ™... -
Page 6: Introduction
OPTIGA Authenticate NBT ™ Antenna design guide 1 Introduction Introduction This chapter provides an explanation of how this guide fits into the OPTIGA Authenticate NBT documentation ™ landscape and a short product overview. Chapter 2 provides more information about components of a bridge tag as well as electrical and geometrical parameters of an antenna. -
Page 7: Nfc I2C Bridge Tags
OPTIGA Authenticate NBT ™ Antenna design guide 1 Introduction NFC I2C bridge tags NFC Bridge Tags are dual-interface tags that enable contactless features for IoT devices via an I2C controller interface, allowing for a touch-and-go experience with a mobile phone. On one side, the NFC Bridge Tags include a contactless passive NFC interface and on the other side, a contact-based I2C target interface that connects to the MCU of the IoT device. -
Page 8: Product Overview
Antenna design guide 2 Product overview Product overview The OPTIGA Authenticate NBT is part of Infineon’s OPTIGA Authenticate product family. It is a ready-to-use ™ ™ dual-interface device that offers a contactless passive NFC interface and an I2C target interface to the host MCU. -
Page 9: Equivalent Circuit For A Bridge Tag
OPTIGA Authenticate NBT ™ Antenna design guide 2 Product overview 2.1.1 Equivalent circuit for a bridge tag Figure 4 depicts an electrical equivalent circuit of a OPTIGA Authenticate NBT bridge tag. The given electrical ™ elements represent the bridge tag's main components, with the focus on its NFC interface. OPTIGA™... -
Page 10: Carrier Material
OPTIGA Authenticate NBT ™ Antenna design guide 2 Product overview 2.1.3 Carrier material All materials exhibit certain dielectric and thermal properties. Different parameters influence the relative permittivity (dielectric constant) of carrier materials. For FR4, for example, the thickness of the material, resin content, and glass weave style possess an impact on the capacitive component of the antenna. -
Page 11: Geometrical And Electrical Parameters Of An Antenna
OPTIGA Authenticate NBT ™ Antenna design guide 2 Product overview Geometrical and electrical parameters of an antenna The following sections provide information on both the geometrical and electrical parameters of the antenna, along with fundamental formulas that explain the relationships between these parameters. 2.2.1 Physical antenna dimensions In general, the larger the antenna, the better the power transfer from the NFC reader to the tag (tag-only use... -
Page 12: Electrical Antenna Parameters
a , b , t, g, w, d, p, N coil To estimate the inductance, the Infineon Card Coil Calculator tool (refer to Chapter 4) can be used. 2.2.3.2 Coil capacitance (Ccoil) The capacitance (C ) is mainly affected by the close distance between the coil turns. -
Page 13: Resonance Frequency (F )
(IC). Its value is always a trade-off between maximum power range and minimal loading effect of the card on the NFC reader. Note: Infineon recommends keeping the coil's quality factor as high as possible with the respective antenna manufacturing technology in order to achieve a balanced overall quality factor of the chip-antenna system. - Page 14 OPTIGA Authenticate NBT ™ Antenna design guide 2 Product overview • Do not place the GND plane (or any other supply plane) underneath the NFC antenna • Do not route copper traces underneath the NFC antenna • Wiring, components and objects should be kept away from the NFC antenna When designing the product housing, ensure the following: •...
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Page 15: Design Flow
OPTIGA Authenticate NBT ™ Antenna design guide 3 Design flow Design flow Figure 8 depicts the antenna design flow for the OPTIGA Authenticate NBT bridge tag. ™ Start antenna design process · Antenna size and shape · Chip specific on-chip capacitance ·... -
Page 16: Design Examples
4.1.2 Calculation with Card Coil Calculator The Infineon Card Coil Calculator enables the assessment of antenna design parameters. The tool provides a graphical user interface for entering and adjusting physical antenna/coil parameters, such as dimension, technology, and used materials. The coil inductance, capacitance, resistance and the resulting resonance frequency f of the IC-coil system can be calculated. -
Page 17: Figure 10 Product And Package Selection
OPTIGA Authenticate NBT ™ Antenna design guide 4 Design examples Figure 10 Product and package selection After selecting the target device, the physical dimensions of the coil covering the length and width of the coil, the width of the track, the gap between the windings, the number of turns, material specific parameter values and the electrical parameters can be entered. -
Page 18: Figure 11 Class 5 Antenna Physical Parameters
OPTIGA Authenticate NBT ™ Antenna design guide 4 Design examples Figure 11 Class 5 antenna physical parameters By pressing the "Calculate results" button, the electrical parameters of the coil (L and R ) and the coil coil coil resulting resonance frequency f (in unloaded and threshold condition) are computed and displayed. -
Page 19: Figure 12 Class 5 Antenna Electrical Parameters
OPTIGA Authenticate NBT ™ Antenna design guide 4 Design examples Figure 12 Class 5 antenna electrical parameters The coil design parameters are determined by iterating the physical parameters for the coil and re-running the calculation. These physical parameters of the coil must be taken into account when designing the antenna on the PCB. -
Page 20: Resulting Design, Class 5 Shield Antenna
OPTIGA Authenticate NBT ™ Antenna design guide 4 Design examples 4.1.3 Resulting design, Class 5 shield antenna Figure 14 depicts the Class 5 PCB antenna directly attached to the OPTIGA Authenticate NBT Secure Shield. ™ Figure 14 NBT Secure Shield with Class 5 antenna 4.1.4 Verification After finishing the antenna design and PCB manufacturing processes, the resonance frequency (f... -
Page 21: Target Specification
OPTIGA Authenticate NBT ™ Antenna design guide 4 Design examples 4.2.1 Target specification The following are the target specifications for the design example: • Antenna dimensions: 20 mm x 25 mm, rectangular, Class 6 (refer to [1]) Carrier material: FR4, ε •... -
Page 22: Verification
OPTIGA Authenticate NBT ™ Antenna design guide 4 Design examples Figure 17 Shield antenna – Class 6 flexible mount (default configuration) 4.2.4 Verification Table 8 lists the measurements for the Class 6 sized antenna connected to the NBT Secure Shield with the 10 cm UMCC cable, which is a component of the OPTIGA Authenticate NBT Development Kit and the ™... -
Page 23: Calculation With Card Coil Calculator
OPTIGA Authenticate NBT ™ Antenna design guide 4 Design examples 4.3.2 Calculation with Card Coil Calculator The design parameters for the Class 6 sized antenna, direct mount can be seen in the figure below. Compared to the flexible mount example, in this scenario the UMCC cable as well as the two U.FL connectors do not need to be considered for the calculation. -
Page 24: Verification
OPTIGA Authenticate NBT ™ Antenna design guide 4 Design examples Figure 20 Shield antenna – Class 6 direct mount Note: The Class 6 antenna designs, "flexible mount" and "direct mount", are combined in a single shield antenna. The primary difference is the number of turns required to adjust the coil inductance. To implement such a combined design, dedicated solder bridges are integrated into the antenna. -
Page 25: Figure 21 20 Mm X 20 Mm Antenna Physical And Electrical Parameters
OPTIGA Authenticate NBT ™ Antenna design guide 4 Design examples Figure 21 20 mm x 20 mm antenna physical and electrical parameters User guide Revision 2.1 2024-04-26... -
Page 26: Power Matching
OPTIGA Authenticate NBT ™ Antenna design guide 5 Power matching Power matching The power matching circuitry optimizes the transfer of energy from the antenna to the OPTIGA Authenticate NBT tag. A power matching network is placed between the IC and the antenna in a ™... -
Page 27: References
Infineon Technologies AG: OPTIGA Authenticate NBT, Release Notes (latest revision) ™ Infineon Technologies AG: OPTIGA Authenticate NBT, Extended Datasheet (latest revision) ™ Infineon Technologies: Infineon Developer Center, Infineon Card Coil Calculator 4.0 - https:// softwaretools.infineon.com/tools/com.ifx.tb.tool.infineoncardcoilcalculator User guide Revision 2.1 2024-04-26... -
Page 28: Glossary
OPTIGA Authenticate NBT ™ Antenna design guide Glossary Glossary inter-integrated circuit (I2C) International Electrotechnical Commission (IEC) The international committee responsible for drawing up electrotechnical standards. International Organization for Standardization (ISO) microcontroller unit (MCU) One or more processor cores along with memory and programmable input/output peripherals. near field communication (NFC) printed circuit board (PCB) surface-mounted device (SMD) -
Page 29: Revision History
OPTIGA Authenticate NBT ™ Antenna design guide Revision history Revision history Reference Description Revision 2.1, 2024-04-26 Editorial changes Revision 2.0, 2024-03-28 Major customer release Revision 1.1, 2023-07-07 Editorial changes Revision 1.0, 2023-05-12 Initial release User guide Revision 2.1 2024-04-26... -
Page 30: Disclaimer
Infineon Technologies, All Rights Reserved. of any kind, including without limitation warranties of Infineon Technologies’ products may not be used in non-infringement of intellectual property rights of any any applications where a failure of the product or third party.
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