Nested Wireless Charging and NFC Antenna Design
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Solution Overview
Problem
Existing wireless antennas face reduced charging efficiency and deteriorated NFC recognition due to interference between loop antennas for magnetic induction wireless charging and NFC functions.
Innovation Solution
A wireless antenna design with a loop antenna for NFC integrated inside a loop antenna for wireless charging, optimized by adjusting the distance and number of turns between coil members to satisfy resistance (R) and quality factor (Q) values defined by the Wireless Power Consortium and Power Matters Alliance, enhancing both charging and NFC efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a loop antenna for wireless charging and a loop antenna for NFC are provided together in a small smartphone, then both wireless charging and NFC functions are supported, but charging efficiency is reduced and NFC recognition efficiency is deteriorated due to interference between the two loop antennas
Solution Approach 1:
The NFC loop antenna is nested inside the wireless charging loop antenna, with the NFC antenna positioned in the central region surrounded by the charging antenna. This nested configuration allows both functions to coexist in a compact space while minimizing mutual interference through optimized spatial arrangement and electromagnetic field isolation.
2Volume of moving object
If the distance between the NFC loop antenna and wireless charging loop antenna is reduced to save space, then device compactness is improved, but interference between the antennas increases causing reduced charging and NFC efficiency
Solution Approach 1:
The patent applies different structural characteristics to different regions of the antenna system. The NFC antenna is positioned in the central region with specific turn configurations, while the charging antenna surrounds it with optimized spacing. This local differentiation allows compact overall dimensions while maintaining adequate electromagnetic isolation between the two functional areas.
3Reliability
If the number of turns in the NFC loop antenna is increased to improve NFC signal strength, then NFC recognition efficiency is improved, but the resistance increases and interference with wireless charging function worsens
Solution Approach 1:
The patent optimizes the number of turns in the NFC loop antenna within a specific range to achieve the desired balance. By carefully controlling the turn count parameter, the design achieves sufficient NFC signal strength while limiting resistance increase and minimizing interference with the wireless charging function, thereby optimizing overall system performance.
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 improves wireless charging efficiency and NFC recognition efficiency by minimizing interference, ensuring the R value ranges from 4Ω to 6Ω and Q value from 23 to 27, thus optimizing the performance of both functions.
Implementation Method 1
a magnetic-induction method, a magnetic-resonance method, and an electromagnetic-wave method may be mentioned
Implementation Method 2
NFC technology is non-contact near-field wireless communication using a frequency band of 13.56 MHz
Data Source
AI summary
A wireless antenna can include a wireless communication antenna including a first wireless communication coil, and a second wireless communication coil; and a wireless charging antenna including a wireless charging coil, in which the wireless charging coil is disposed inside the first wireless communication coil, the second wireless communication coil is disposed inside the wireless charging coil, the wireless communication antenna further includes a coil connection member traversing the wireless charging coil to interconnect the first wireless communication coil and the second wireless communication coil, and a width of a winding of the second wireless communication coil is less than a width of a winding of the first communication coil.