Wearable Metal-Frame Antenna Feeding Across Multiple Frequency Bands
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Solution Overview
Problem
Wearable electronic devices face challenges in maintaining efficient antenna radiation due to the influence of the human body, which varies by frequency band, leading to degraded performance in mid-frequency and high-frequency bands when power is fed to specific points on the metal frame.
Innovation Solution
The device feeds power to a first point on the metal frame closer to the rear cover for low-frequency bands to utilize the human body as an antenna ground, and to a second point closer to the display for mid-frequency and high-frequency bands to minimize the body's interference, using conductive structures for electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single feeding point is used for all frequency bands, then the device structure is simplified, but the antenna radiation efficiency is degraded across certain frequency bands
Solution Approach 1:
The patent implements a dynamic feeding system that selects between multiple feeding points on the metal frame based on the operating frequency band. This dynamic adaptation allows the antenna to maintain high radiation efficiency across different frequency bands (low-frequency, mid-frequency, and high-frequency bands) by optimizing the feeding location for each band's specific requirements
Solution Approach 2:
The system changes the feeding point parameter (location on the metal frame) based on the operating frequency band. By adjusting which feeding point is active, the system optimizes the electrical characteristics of the antenna for different frequency ranges, thereby maintaining high radiation efficiency across all bands
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 approach enhances antenna radiation efficiency by optimizing ground utilization across different frequency bands, preventing degradation and interference, thereby improving communication performance.
Implementation Method 1
a metal frame forming at least a portion of a side surface of the wearable electronic device... the wireless communication circuit feeds power to a first point of the metal frame... to receive a signal in a first frequency band
Data Source
AI summary
A wearable electronic device according to an embodiment may include a metal frame forming at least a portion of a side surface of the wearable electronic device, a display mounted on the metal frame, a rear cover forming a rear surface of the wearable electronic device, a printed circuit board (PCB) disposed in a space formed by the rear cover and the metal frame, and a wireless communication circuit disposed on the PCB, wherein the wireless communication circuit feeds power to a first point of the metal frame, which having a first height from the rear cover, to receive a signal in a first frequency band, and feeds power to a second point of the metal frame, which has a second height from the rear cover that is higher than the first height to receive a signal in a second frequency band higher than the first frequency band.