Wearable Antenna Side Frame Switching for Metal Strap Interference
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Solution Overview
Problem
Wearable electronic devices face challenges in maintaining stable antenna performance due to the varying materials of the straps, which can affect signal transmission and reception, especially when made of conductive materials.
Innovation Solution
The wearable electronic device incorporates a conductive side frame surrounding the PCB, with strategically positioned ground portions and a feeder to dynamically adjust the electrical path based on strap material, allowing for stable antenna performance by blocking signal flow to lug portions and detecting impedance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal strap is used for mounting the wearable electronic device, then the strap provides structural support and durability, but the antenna performance is reduced due to signal interference from the conductive material
Solution Approach 1:
The side frame is divided into multiple sections with selective ground portions that can be independently connected or disconnected. This segmentation allows the antenna structure to adapt its electrical characteristics based on whether a conductive strap is present, resolving the conflict between using metal straps for structural support and maintaining antenna performance.
Solution Approach 2:
The ground portions are configured to be selectively connected to the side frame based on the presence of a strap. This dynamic reconfiguration allows the antenna electrical path to change from a closed loop (when no strap is present) to an open path (when a conductive strap is present), thereby maintaining antenna performance across different wearing conditions.
2Device complexity
If the antenna electrical path is fixed, then the device structure is simple, but the antenna performance varies depending on the strap material
Solution Approach 1:
The ground portions are configured to be selectively connected to the side frame based on the presence of a conductive strap. When a metal strap is detected, the ground portions disconnect to prevent signal leakage; when no strap is present, they connect to form a complete antenna loop. This dynamic adaptation maintains antenna performance across different wearing conditions without requiring complex external sensors.
Solution Approach 2:
The antenna structure uses the strap's own presence to trigger the reconfiguration. The conductive strap itself acts as the detection mechanism, and the ground portions automatically reconfigure in response to the strap's electrical characteristics, eliminating the need for separate detection circuits or sensors.
3Reliability
If ground portions are added to selectively connect to the side frame, then antenna performance stability is improved, but device complexity increases
Solution Approach 1:
The ground portions are integrated directly into the side frame structure, merging the antenna support function with the grounding function. This integration eliminates the need for separate grounding components and reduces the overall device complexity while maintaining the ability to selectively reconfigure the antenna electrical path.
Solution Approach 2:
The side frame serves multiple functions: it provides structural support, acts as the antenna radiator, and incorporates the ground portions for electrical reconfiguration. This multi-functionality reduces the need for additional components and simplifies the overall device structure while enabling dynamic antenna performance optimization.
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 solution ensures stable antenna performance by adapting the electrical path according to strap material, preventing signal loss and enabling wireless communication in suitable frequency bands for the device's state of use.
Implementation Method 1
an antenna structure including a side frame 410 of a conductive material surrounding the PCB 430... a feeder 470 configured to apply an electrical signal to the side frame 410... configured to transmit and receive a wireless signal
Implementation Method 2
a plurality of ground portions 480 configured to selectively connect the side frame 410 to a ground... detecting a voltage standing wave ratio of the electrical signal... determining whether to change the electrical path
Implementation Method 3
If the strap includes a metal material, the performance of an antenna included in the wearable electronic device may be reduced... preventing signal loss
Data Source
AI summary
Disclosed is a wearable electronic device comprising an antenna. A wearable electronic device according to an embodiment may comprise: a housing comprising a front surface facing in a first direction, a rear surface facing in a second direction opposite to the first direction, and a lateral surface surrounding an inner space between the front and rear surfaces; a printed circuit board which is disposed in the inner space and comprises a ground; an antenna structure for transmitting/receiving radio signals; and a processor. The antenna structure may comprise: a wireless communication circuit disposed on the printed circuit board; a lateral frame made of a conductive material, the lateral frame forming at least a part of the lateral surface while surrounding the periphery of the printed circuit board, and the lateral frame comprising a pair of rung portions to which a strap is connected, a first connecting portion for connecting the pair of rung portions, and a second connecting portion for connecting the pair of rung portions while being opposite the first connecting portion; a feeding portion for applying an electric signal to the lateral frame; and a switching circuit comprising one or more ground portions for selectively connecting the printed circuit board and the lateral frame. The processor may operate the switching circuit such that an electric signal applied to the lateral frame in a first mode moves via the rung portions, and may operate the switching circuit such that an electric signal applied to the lateral frame in a second mode bypasses the rung portions.