Wearable Metal Frame Antenna Grounding for Multi-Band RF
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Solution Overview
Problem
Existing wearable devices face challenges in designing antennas that support various radio frequencies due to space constraints and the need for efficient radio frequency signal transmission and reception.
Innovation Solution
A wearable device design incorporating a metal frame, a display, a printed circuit board, a wireless charging coil, and a conductive member between the wireless charging coil and the PCB, where the wireless communication circuit transmits or receives RF signals using the metal frame and conductive member, with the conductive member and wireless charging coil acting as grounds for the metal frame, and the PCB having specific connection points for each component to optimize signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional antenna design is used in wearable devices, then the antenna can support specific radio frequencies, but the device cannot efficiently support multiple frequency bands due to space constraints
Solution Approach 1:
The metal frame is designed to serve dual purposes: as the structural housing of the wearable device and as an antenna element for wireless communication. This multi-functional design allows the same component to provide both mechanical support and electromagnetic radiation functions, thereby supporting multiple frequency bands without requiring additional dedicated antenna space.
Solution Approach 2:
The patent combines the antenna structure with the device housing (metal frame) and integrates it with the wireless charging coil structure. By merging these components, the design eliminates the need for separate antenna elements, maximizing space utilization and enabling multi-frequency operation within the constrained wearable form factor.
2Area of stationary object
If the metal frame is used as an antenna, then space is saved, but electromagnetic interference with other components may occur
Solution Approach 1:
A conductive member is introduced as an intermediary element positioned between the metal frame antenna and the wireless charging coil. This conductive member acts as a shielding barrier that redirects or absorbs electromagnetic fields, preventing direct interference between the antenna and charging coil while maintaining the integrated space-efficient design.
Solution Approach 2:
The internal structure is segmented into distinct functional zones: the metal frame for antenna function, the wireless charging coil for power transfer, and the conductive member for electromagnetic shielding. This spatial segmentation allows each component to perform its function independently while minimizing mutual interference through proper positioning and grounding.
3Area of stationary object
If components are closely integrated to save space, then device compactness is improved, but signal transmission quality may deteriorate
Solution Approach 1:
The conductive member is strategically positioned and shaped to provide localized electromagnetic shielding precisely where the antenna and wireless charging coil are in close proximity. This targeted shielding approach maintains signal transmission quality in critical areas while allowing compact integration elsewhere, ensuring reliable communication without sacrificing space 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
Enhances the ability of wearable devices to transmit and receive radio frequency signals efficiently across multiple frequency bands by optimizing the electrical connections and grounding of components, thereby improving antenna performance.
Implementation Method 1
The wireless communication circuit may be configured to transmit or receive a radio frequency (RF) signal using the metal frame
Implementation Method 2
the conductive member, the wireless charging coil, and the display may be configured to be a ground for the metal frame
Data Source
AI summary
A wearable device may include: a metal frame; a display; a printed circuit board (PCB); a wireless charging coil; a conductive member disposed between the wireless charging coil and the PCB, facing the wireless charging coil, and spaced apart from the wireless charging coil; and a wireless communication circuit disposed on the PCB. The wireless communication circuit may be configured to transmit or receive a radio frequency (RF) signal using the metal frame, the conductive member may be coupled to the wireless charging coil, and the conductive member, the wireless charging coil, and the display may be configured to be a ground for the metal frame.