NFC Charging Pad Antenna Segmentation for Off-Center Phone Alignment
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Solution Overview
Problem
Recent smartphones with NFC antennas located on the upper portion of their back face, rather than the periphery, experience limited or impossible near-field communication (NFC) with conventional inductive chargers due to misalignment and interference from metal covers, which are designed for peripheral NFC antennas.
Innovation Solution
A near-field communication device with two secondary NFC antennas positioned at opposite ends of conductive metal pads on two carriers, allowing for electromagnetic fields perpendicular to the primary NFC antenna, expanding the communication zone and enabling effective NFC with off-center NFC antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the NFC antenna is located on the periphery of the charging device, then uniform communication zone is provided over the entire surface, but communication with smartphones having off-center NFC antennas (on upper back face) is limited or impossible
Solution Approach 1:
The NFC antenna is divided into multiple segments arranged along at least one diagonal of the rectangular support, rather than being positioned peripherally. This segmentation allows the antenna to cover diagonal areas including corners, creating overlapping communication zones that accommodate both peripheral and off-center smartphone NFC antenna positions.
Solution Approach 2:
The NFC antenna arrangement transitions from a peripheral circular pattern to a diagonal linear arrangement across the rectangular support. This dimensional change enables coverage of corner areas and creates extended communication zones that intersect to cover the entire surface, including areas near smartphone edges where off-center antennas are located.
2Device complexity
If a single NFC antenna is used on the charging device, then device complexity is reduced, but communication zone coverage is insufficient for off-center smartphone antennas
Solution Approach 1:
Instead of using multiple complete NFC antennas, the single NFC antenna is segmented into multiple sections arranged along the diagonal. Each segment contributes to the overall communication zone, and their combined effect provides extended coverage equivalent to multiple antennas while maintaining simpler hardware architecture.
Solution Approach 2:
The single NFC antenna is extended along the diagonal dimension of the rectangular support, maximizing its reach across the charging surface. This diagonal orientation allows the antenna to cover corner areas and create extended communication zones that a centrally or peripherally positioned antenna could not achieve.
3Adaptability or versatility
If the NFC antenna is positioned to cover corner areas, then communication with edge-located smartphone antennas is improved, but uniform communication zone over the entire surface may be compromised
Solution Approach 1:
The diagonal NFC antenna is divided into segments that create multiple communication zones. These zones overlap in the center area and extend toward the corners, ensuring that corner areas are covered while maintaining uniform communication capability across the entire charging surface through the overlapping zones.
Solution Approach 2:
The diagonal arrangement of the NFC antenna along the rectangular support's diagonal creates communication zones that naturally overlap in the center and extend to corners. This geometric configuration ensures both corner coverage and central uniformity simultaneously, as the diagonal orientation maximizes surface coverage efficiency.
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
The solution effectively expands the NFC communication zone to include the edges of the device, allowing communication with smartphones having NFC antennas on their upper back face, even when covered with metal, by generating additional electromagnetic fields that complement the primary NFC field.
Implementation Method 1
a first near-field communication antenna (A1) located on a first support (PCB10)
Implementation Method 2
a second near-field communication antenna (A2), a first winding portion (A21) of which is located on one end of the first support (PCB10) and a second winding portion (A22) of which is located on one end of the second support (PCB20), the two ends being located on one and the same side of the device
Data Source
AI summary
A device for near-field communication with a portable user apparatus, includes: a first communication antenna located on a first carrier; a first device for activating the first antenna located on a second carrier, which is facing the first carrier and mechanically connected to the first carrier by pads. The pads are made of conductive metal and the device also includes: a second antenna, a first winding portion of which is located on one end of the first carrier and a second winding portion of which is located on one end of the second carrier, the two ends facing one another. The first portion and second portion of each winding electrically connected by a pad, the second antenna emitting an electromagnetic field, a main component of which is perpendicular to a main component of the electromagnetic field emitted by the first antenna; and a second device for activating said second antenna.