Smart Watch Antenna Layout for Tight Space and Low Interference
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Solution Overview
Problem
Wearable devices, particularly smart watches, face challenges in effectively utilizing limited space for antenna design due to their compact size and integration of communication functions, leading to difficulties in implementing multiple antennas without interference from the human body and metal components.
Innovation Solution
The wearable device incorporates an antenna design that utilizes the space between the screen component and the metal middle frame, employing an antenna bracket with a metal cable or flexible printed circuit, which is positioned away from the user's arm and internal components to minimize interference, and includes a slot antenna between the circuit board and metal frame to enhance bandwidth and aesthetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are integrated into the smart watch, then communication functionality is improved, but space utilization becomes difficult due to the compact size
Solution Approach 1:
The antenna is nested within the existing structural layers of the smart watch, specifically positioned between the screen component and the metal middle frame. This allows the antenna to occupy otherwise unused space within the device's cross-section, enabling multi-antenna integration without increasing the overall device volume.
Solution Approach 2:
The antenna is arranged in the thickness direction (Z-axis) of the smart watch rather than occupying lateral space. By utilizing the vertical dimension between existing components, the design accommodates multiple antennas within the constrained footprint of the device.
2Volume of moving object
If the antenna is positioned closer to the screen component, then space is saved, but interference from metal components increases
Solution Approach 1:
An insulating bracket is introduced as an intermediary component between the antenna and the metal middle frame. This bracket electrically isolates the antenna from the conductive metal frame, preventing unwanted electromagnetic coupling and interference while maintaining the compact spatial arrangement.
Solution Approach 2:
The antenna is positioned in a specific local region between the screen component and metal frame, and the insulating bracket is applied selectively at the interface with the metal frame. This localized insulation approach addresses interference only where it occurs without compromising overall space utilization.
3Volume of moving object
If the antenna is positioned closer to the user arm, then compact design is achieved, but human body absorption degrades antenna performance
Solution Approach 1:
The antenna is extracted from the traditional position near the user arm and repositioned in the internal space between the screen component and metal middle frame. This extraction removes the antenna from the harmful influence zone of human body absorption while maintaining the compact external dimensions of the device.
4Ease of manufacture
If traditional antenna designs are used, then manufacturing is simple, but multi-antenna integration is difficult
Solution Approach 1:
The insulating bracket serves multiple functions simultaneously: it provides electrical insulation between the antenna and metal frame, acts as a mechanical support structure for the antenna, and facilitates the integration of multiple antennas within the same device. This multi-functional component simplifies the overall manufacturing process while enabling complex antenna configurations.
Data Source
AI summary
This application provides a wearable device, including a wearable body. The wearable body includes a cover, a screen component, an antenna bracket, a first antenna, a metal middle frame, a circuit board, and a bottom cover. The cover and the bottom cover are respectively connected to two sides of the metal middle frame, the screen component is connected to a side of the cover facing the bottom cover, and the circuit board is located in a space enclosed by the metal middle frame, the screen component, and the bottom cover. An accommodating space is jointly enclosed by an end of the screen component, an inner wall of the metal middle frame, and an inner wall of the cover, the antenna bracket is disposed in the accommodating space, and the first antenna is disposed on the antenna bracket and is connected to the circuit board by using a feedpoint.