Asymmetric NFC Antenna Layout for Mobile Terminals
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Solution Overview
Problem
Near field communication (NFC) antennas in mobile terminals experience significant interference when overlapping, leading to resonance frequency deviations and reduced communication sensitivity and success rates during peer-to-peer networking due to their symmetric structure.
Innovation Solution
The NFC antenna is designed asymmetrically with respect to the terminal body's centerlines, allowing one part to oppose and another part to stagger when two mobile terminals are back to back, thereby reducing interference and maintaining resonance frequency within a bandwidth range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the NFC antenna is designed with a symmetric structure, then the antenna structure is simple and easy to manufacture, but when two mobile terminals are disposed back to back, the two NFC antennas exactly overlap with each other causing large mutual interference and resonance frequency deviation
Solution Approach 1:
The patent applies asymmetry by designing the NFC antenna structure to be asymmetric with respect to the terminal body's centerline. Specifically, the antenna is positioned such that its center does not coincide with the terminal's rear surface centerline, creating an asymmetric layout. This asymmetric design ensures that when two terminals are placed back-to-back for peer-to-peer communication, the antennas do not exactly overlap, thereby reducing mutual interference and resonance frequency deviation while maintaining manufacturing feasibility.
2Productivity
If the NFC antenna is positioned to maximize signal transmission area, then the communication capability is enhanced, but the resonance frequency deviation increases due to greater overlapping area with opposing antennas
Solution Approach 1:
The asymmetric positioning of the NFC antenna relative to the terminal body's centerline creates an optimal balance between communication capability and frequency stability. The antenna is positioned asymmetrically to reduce overlapping area during back-to-back operation, which stabilizes resonance frequency while maintaining sufficient signal transmission area for effective communication.
Solution Approach 2:
The patent modifies the positional parameters of the NFC antenna by offsetting it from the terminal's rear surface centerline. This parameter change (asymmetric positioning) optimizes the balance between communication performance and frequency stability by reducing the overlapping area with opposing antennas during peer-to-peer operation.
3Reliability
If the NFC antenna is designed with larger area to improve signal strength, then the communication sensitivity is improved, but the interference with opposing antennas increases causing resonance frequency deviation
Solution Approach 1:
The asymmetric design of the NFC antenna position relative to the terminal body allows the antenna to have sufficient area for good signal strength while reducing mutual interference. The asymmetric positioning ensures that even with a larger antenna area, the overlapping region with opposing antennas is minimized, thereby maintaining communication sensitivity while reducing resonance frequency deviation.
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 design results in lower resonance frequency deviations, higher communication sensitivity, and improved success rates during peer-to-peer networking, enhancing overall communication capability.
Implementation Method 1
A near field communication (NFC) antenna consists of a circuit board and a planar coil
Data Source
AI summary
A mobile terminal and a NFC antenna are provided. The mobile terminal includes: a terminal body, including a rear surface defined with a rear longitudinal centerline and a rear transverse centerline; near field communication antenna, disposed on the rear surface of the terminal body; wherein at least one of the rear longitudinal centerline and the rear transverse centerline pass through the near field communication antenna, and the near field communication antenna is disposed asymmetrically to the at least one of the rear longitudinal centerline and the rear transverse centerline. The mobile terminal according to the present disclosure shows a lower deviation of the resonance frequency when operating the P2P networking, and also shows high communication sensitivity, a high communication success rate, a strong communication capability, etc.