Antenna Configuration for Compact Wireless Devices
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Solution Overview
Problem
There is a challenge in designing compact wireless electronic devices that can effectively handle multiple communications bands while minimizing interference between antennas and other components, requiring innovative antenna configurations within limited space.
Innovation Solution
The solution involves using a housing with metal sidewalls as an antenna ground and forming antennas from capacitively coupled component layers, including a display and touch sensor layers, with peripheral and rear face antennas to handle different frequency bands, such as using a wireless power coil as a radio-frequency antenna for cellular signals and metal traces on a plastic support for light-based components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional separate antenna structures are used for different communications bands, then each antenna can be optimized for its specific frequency range, but the device size increases and antennas may interfere with each other
Solution Approach 1:
The patent combines multiple antenna functions into a single integrated structure. The housing serves as a common ground plane for multiple antennas operating at different frequency bands, eliminating the need for separate ground structures for each antenna. This merging approach reduces overall device volume while maintaining reliable antenna performance across multiple communications bands.
Solution Approach 2:
The housing structure serves multiple functions simultaneously: it provides mechanical support, acts as an antenna ground plane, and serves as a shield against electromagnetic interference. This multi-functionality allows the device to support multiple communication bands without requiring additional dedicated structures, thereby reducing device size while maintaining performance.
2Adaptability or versatility
If multiple antennas are incorporated to cover growing communications bands, then frequency coverage is improved, but antenna interference and component interference increase
Solution Approach 1:
The patent converts potentially harmful electromagnetic interference into beneficial shielding effects. The housing, when used as a ground plane, creates electromagnetic shielding that protects sensitive internal components from interference while simultaneously supporting multiple antennas. The metal housing acts as a Faraday cage, converting what would be interference pathways into protective barriers.
Solution Approach 2:
The housing ground plane serves as an intermediary structure between multiple antennas and internal electronics. It provides a common reference potential that isolates antennas from each other, preventing mutual interference while allowing them to operate simultaneously at different frequency bands. The ground plane mediates electromagnetic fields, directing energy away from sensitive components.
3Volume of moving object
If compact antenna structures are used to reduce device size, then device portability is improved, but antenna performance and signal transmission may deteriorate
Solution Approach 1:
The patent transitions from planar antenna designs to three-dimensional configurations by utilizing the housing structure as a vertical ground plane. This dimensional change allows antennas to achieve resonant lengths appropriate for their operating frequencies within a compact footprint. The housing extends the effective antenna structure in the third dimension, maintaining signal transmission performance while reducing device volume.
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 configuration allows for efficient transmission and reception of wireless signals across various frequency bands, including cellular and wireless local area network signals, without the need for bulky antenna structures, enhancing the performance and compactness of wireless electronic devices.
Implementation Method 1
The antenna resonating element may be formed from a stack of capacitively coupled component layers at the front face of the device
Implementation Method 2
The housing may form an antenna ground. The antenna ground and an antenna resonating element may be used in forming an antenna
Data Source
AI summary
An electronic device such as a wristwatch may have a housing with metal portions such as metal sidewalls. The housing may form an antenna ground for an antenna. An antenna resonating element for the antenna may be formed from a stack of capacitively coupled component layers such as a display layer, touch sensor layer, and near-field communications antenna layer at a front face of the device. An additional antenna may be formed from a peripheral resonating element that runs along a peripheral edge of the device and the antenna ground. A rear face antenna may be formed using a wireless power receiving coil as a radio-frequency antenna resonating element or may be formed from metal antenna traces on a plastic support for light-based components.