NFC Antenna Array with Passive Relay Elements for Extended Communication Range
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Solution Overview
Problem
Existing near-field radiofrequency communication devices face challenges in achieving optimal communication quality and effectiveness due to variations in the size and position of secondary antennas in portable elements, such as hands-free access badges or mobile phones, which restrict the communication area and degrade NFC quality.
Innovation Solution
The implementation of a device with a primary antenna and passive relay antennas, where the passive relay antennas are juxtaposed with the primary antenna, have adjustable frequencies, and are not powered, allowing them to recycle and amplify the electromagnetic field, providing optimal communication regardless of the secondary antenna's size or position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single primary antenna is used, then the device complexity is reduced, but the communication area and effectiveness are restricted due to field intensity decreasing with distance from the center
Solution Approach 1:
The patent divides the antenna system into multiple independent primary antennas arranged in an array, each capable of being independently activated. This segmentation allows the communication device to cover a larger area by selecting and activating the most appropriate antenna based on the portable element's position, thereby resolving the contradiction between device complexity and communication area.
Solution Approach 2:
The patent implements dynamic selection and adjustment of antenna characteristics (such as number of turns) based on real-time detection of the portable element's position and size. This dynamic adaptation allows the system to optimize communication effectiveness for different scenarios, resolving the contradiction by making the antenna configuration flexible rather than fixed.
2Reliability
If multiple adjustable primary antennas with switches are used to adapt to different portable elements, then the communication effectiveness is improved, but the device complexity and cost increase significantly
Solution Approach 1:
The patent enables the antenna system to automatically detect the portable element's characteristics and self-adjust the optimal antenna configuration without requiring complex external control switches. The system performs self-diagnosis and self-adjustment, thereby improving communication effectiveness while reducing device complexity and cost.
Solution Approach 2:
The patent changes physical parameters of the antenna system (such as the number of turns in the coil) to adapt to different portable elements. By adjusting these parameters dynamically, the system achieves optimal communication effectiveness for various antenna sizes and positions without requiring multiple complete antenna sets or complex switching mechanisms.
3Measurement precision
If the primary antenna is centered to maximize field intensity, then the NFC quality is optimal at the center, but the communication area is restricted when portable elements are off-center or larger than the antenna
Solution Approach 1:
The patent segments the antenna system into multiple distributed primary antennas rather than relying on a single centered antenna. This segmentation allows the system to maintain optimal NFC quality at multiple locations by selecting the most appropriate antenna based on the portable element's position, thereby expanding the effective communication area while maintaining quality.
Solution Approach 2:
The patent applies local quality optimization by having different antennas with potentially different characteristics (such as different numbers of turns) positioned at different locations. Each antenna is optimized for its local region, and the system selects the appropriate antenna based on where the portable element is positioned, thereby maintaining optimal NFC quality across a larger overall area.
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 enhances the communication area and maintains optimal quality and effectiveness of near-field communication, reducing costs by eliminating the need for multiple active antennas and switches, while ensuring reliable communication across various portable elements.
Implementation Method 1
passive relay antennas...allowing them to recycle and amplify the electromagnetic field
Data Source
AI summary
Disclosed is a device (D′) for near-field radiofrequency communication with a portable element, the device including: at least one near-field communication primary antenna (A0) having a predetermined communication frequency (Fc); and a microcontroller (30′) electrically connected to the primary antenna, including a power supply source for the primary antenna and a receiver unit for the data (20′) received by the primary antenna. The communication device further includes: at least one passive relay antenna (A1 . . . A8), juxtaposed with the primary antenna, relay frequencies (F1 . . . F8), lying within a range of values around the predetermined communication frequency (Fc), but different from the predetermined communication frequency (Fc), electrically connected to the data receiver unit. Also included is a unit (C4) for adjusting the relay frequency. The communication device can be used to enlarge the near-field communication surface of the communication device.