Configurable NFC Antenna for Secure WLAN Key Exchange
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Solution Overview
Problem
Server information handling systems in data centers face limitations with existing wireless communication methods, such as WLAN and WPAN, due to security concerns and design challenges, particularly in densely packed environments, where NFC's low bandwidth and limited range hinder its adoption for efficient communication.
Innovation Solution
A configurable NFC antenna system that selectively isolates portions of conductive material to support non-NFC communications at frequencies like 2.4, 5, and 60 GHz, managed by a baseboard management controller (BMC) using a multiplexor to interface with NFC and WLAN/WPAN transceivers, ensuring secure authentication and encryption before allowing non-NFC communications, and utilizing additional methods like infrared or ultraviolet illumination for key exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If WLAN or WPAN wireless communication is implemented in server information handling systems, then communication flexibility and administrator access are improved, but security risks increase due to potential signal interception by malicious attackers
Solution Approach 1:
The NFC antenna is segmented into multiple conductive portions that can be selectively activated. The antenna structure includes first, second, third, and fourth conductive portions that can be independently configured to support different communication protocols (NFC at 13.56 MHz or WLAN/WPAN at 2.4/5/60 GHz), allowing the system to divide the antenna's functionality based on security requirements
Solution Approach 2:
The antenna system dynamically reconfigures its electrical characteristics through switching mechanisms controlled by the BMC. The antenna transitions between NFC mode and WLAN/WPAN mode based on authentication status, with the controller adjusting impedance matching networks and conductive path configurations to optimize performance for the active protocol while preventing unauthorized access
2Adaptability or versatility
If a dedicated WLAN or WPAN chip and antenna are implemented, then wireless communication capability is improved, but the physical space required in the densely packed data center environment increases
Solution Approach 1:
The NFC antenna structure is designed to serve multiple functions: it operates as an NFC antenna at 13.56 MHz for secure authentication and key exchange, and simultaneously functions as a WLAN/WPAN antenna at 2.4 GHz, 5 GHz, or 60 GHz for data communication. This multi-functional design eliminates the need for separate dedicated antennas for each protocol
Solution Approach 2:
The patent merges the NFC antenna structure with WLAN/WPAN antenna requirements by configuring the same conductive portions to support both NFC and wireless LAN personal area network protocols. The antenna elements and impedance matching networks are designed to accommodate both frequency ranges and protocol requirements within a single integrated structure
3Reliability
If NFC communication is used for secure authentication, then security is improved, but data transfer bandwidth and communication range are limited
Solution Approach 1:
The system performs NFC-based authentication and encryption key exchange as a preliminary action before enabling WLAN/WPAN communication. The secure NFC interaction establishes trusted credentials and encryption parameters in advance, allowing the higher-bandwidth WLAN channel to be activated only after security is verified
Solution Approach 2:
NFC serves as an intermediary mechanism for secure key exchange and authentication. The NFC channel acts as a trusted mediator that establishes security parameters before the system transitions to the WLAN/WPAN channel for actual data transfer, combining the security benefits of NFC with the bandwidth benefits of WLAN
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables efficient and secure wireless communication by reconfiguring the NFC antenna to support multiple protocols within a small footprint, enhancing security through authentication and encryption, reducing the risk of malicious interception, and allowing for more rapid data transfer with increased bandwidth.
Implementation Method 1
A NFC antenna coil transmits and receives signals by NFC communications at a NFC frequency of 13.56 MHz and/or by wireless local area network (WLAN) and/or wireless personal area network (WPAN, i.e., Bluetooth) communications at WLAN/WPAN frequencies of 2.4, 5 and 60 GHz
Data Source
AI summary
A server information handling system baseboard management controller (BMC) includes an NFC transceiver that communicates NFC signals through an NFC antenna structure. The BMC selectively configures the NFC antenna structure to isolate portions of conductive material for use as an antenna in non-NFC communications, such as wireless local area network communications (WLAN) at 2.4 or 5 GHz or wireless personal area network (WPAN) communications at 2.4 or 60 GHz. In one embodiment, WLAN and WPAN communications are encrypted with a key provided through NFC or other types of wireless communication, such as visible, infrared or ultraviolet light signals.