Stacked Patch and Coil Antenna Layout for Compact Multi-Radio Devices
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Solution Overview
Problem
The challenge in electronic devices is the interference and space constraints that arise from overlapping coils and antennas, leading to performance degradation due to the use of conductive materials and the need for a wide mounting space for UWB antennas.
Innovation Solution
The solution involves a stacked structure with a first antenna having a patch shape and a second antenna with a coil shape, separated by a dielectric material and surrounded by a magnetic material, which minimizes overlap and interference, allowing for a more efficient use of space and improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple coils and antennas are provided to support wireless charging, MST, NFC, and UWB technologies, then the functional versatility is improved, but the mounting space requirement increases and interference occurs between overlapping components
Solution Approach 1:
The patent transitions from planar arrangement to three-dimensional stacked arrangement by placing the patch antenna and coil antenna on different layers separated by a dielectric layer. This vertical stacking enables multiple antennas to coexist in a limited space without overlapping in the same plane, thereby reducing interference and minimizing the required mounting area while maintaining support for multiple wireless technologies.
Solution Approach 2:
The patent implements a nested configuration where the coil antenna is positioned within the projection area of the patch antenna, or vice versa, allowing one antenna structure to be contained within the spatial envelope of another. This nesting approach maximizes space utilization and enables multiple antenna functions within a compact footprint.
2Area of stationary object
If coil patterns are reduced in size to prevent overlapping, then the mounting space is reduced, but antenna performance degrades
Solution Approach 1:
By moving the antenna structures to different vertical layers separated by a dielectric, the patent allows each antenna to maintain its optimal size and shape for performance without being constrained by planar overlap requirements. The vertical separation eliminates interference while preserving the electrical characteristics and radiation patterns of each antenna type.
3Reliability
If magnetic materials are used to satisfy coil pattern characteristics, then the antenna performance is improved, but the cost increases
Solution Approach 1:
The patent applies magnetic materials selectively only in the regions where coil antennas are positioned, rather than using them throughout the entire antenna assembly. This localized application minimizes the quantity of expensive magnetic material required while still providing the necessary magnetic field enhancement and performance characteristics for wireless charging and NFC functions.
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 reduces interference among antennas and coils, enhances performance, and provides flexibility in designing antenna patterns, while utilizing magnetic materials effectively for each characteristic.
Implementation Method 1
a dielectric material disposed between the first layer and the second layer
Implementation Method 2
a magnetic material disposed under the dielectric at a position corresponding to the second antenna
Data Source
AI summary
An electronic device, according to various embodiments of the present disclosure, may comprise: a first layer including a first antenna having a patch shape, and a second antenna at least partially surrounding the first antenna and having a coil shape; a second layer including a first pattern disposed at a position corresponding to the first antenna and configured to operate as a ground of the first antenna, and a second pattern electrically connected to the second antenna; a dielectric disposed between the first layer and the second layer; and a magnetic material disposed under the dielectric at a position corresponding to the second antenna.