Display Shield Antenna Layout for Wearable Body Detuning
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Solution Overview
Problem
Antenna design for small electronic devices, particularly wearable devices, is challenging due to constrained form factors and body effects that cause detuning, attenuation, and shadowing, especially when multiple antennas are required for various communication standards.
Innovation Solution
Integrate a display shield as a multiband antenna that is electrically isolated from the user's body, grounded to the device enclosure, and tuned by antenna tuning circuits, allowing it to function as a radiating element across multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the antenna size is increased to improve radiation efficiency, then radiation efficiency is improved, but the device form factor constraint is violated
Solution Approach 1:
The display shield is merged with the antenna function, where the display shield serves dual purposes: protecting the display and functioning as the antenna radiating element. This integration allows the antenna to utilize the existing display shield structure, eliminating the need for a separate antenna component and enabling larger effective antenna area within the constrained device form factor.
Solution Approach 2:
The display shield is designed to perform multiple functions simultaneously: it acts as a physical shield for the display, a structural component of the device, and the antenna radiating element for wireless communication. This multi-functionality resolves the contradiction by maximizing the utility of existing structural components rather than adding separate antenna elements.
2Ease of operation
If the antenna is positioned close to the user's body, then the device is more comfortable to wear, but body effects cause detuning, attenuation, and shadowing
Solution Approach 1:
The display shield acts as an intermediary structure between the antenna and the user's body. By positioning the display shield (which functions as the antenna) at the rear of the device away from the body, it serves as a mediator that maintains adequate separation to reduce body effects while still allowing the device to be comfortably worn. The display shield's structural presence helps manage the interaction between the antenna and body proximity.
3Adaptability or versatility
If multiple antennas are implemented to support various communication standards, then communication versatility is improved, but device complexity and space consumption increase
Solution Approach 1:
The antenna system employs dynamic tuning capabilities through integrated tuning circuits that can adjust the resonant frequency of the display shield antenna. This dynamic adjustment allows a single antenna structure to adapt to multiple communication frequency bands and standards, replacing the need for multiple fixed-frequency antennas and reducing overall system complexity.
Solution Approach 2:
The antenna system changes its operating parameters (frequency, impedance) through integrated tuning circuits that modify the electrical characteristics of the display shield antenna. By dynamically changing these parameters, a single antenna can support multiple communication standards across different frequency bands, avoiding the need for multiple physical antennas.
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
The integrated display shield antenna mitigates body effects, enhances radiation efficiency, and optimizes available space by functioning as both a protective shield and a multiband antenna, reducing the need for additional components.
Implementation Method 1
the display shield is configured to receive and/or transmit radio frequency waves
Implementation Method 2
the display shield is grounded at least partially by the one or more shield grounding clips
Data Source
AI summary
An electronic device is provided having an antenna that also functions as a display shield for a display of the device. The display shield can separate components for a display module from other electrical components of the electronic device. The display shield can be grounded to an enclosure of the device at least partially by one or more shield grounding clips, and configured to receive and/or transmit radio frequency waves.