Strap Antenna Interconnect for Compact Mobile RF Performance
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Solution Overview
Problem
Mobile devices, such as smartwatches, face challenges in accommodating multiple antennas due to limited space and interference from metal enclosures, leading to restricted bandwidth and signal strength, and increasing device size is undesirable.
Innovation Solution
The integration of antennas in wrist straps that connect to internal components via direct or capacitive connections, avoiding metallic cradles, allowing for flexible and efficient antenna placement and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are integrated into mobile devices, then communication functionality is improved, but device size increases and signal interference occurs
Solution Approach 1:
The antenna system is divided into separate modular components including UWB antenna, Wi-Fi antenna, and Bluetooth antenna, each operating independently at different frequency bands. This segmentation allows multiple antennas to function simultaneously without mutual interference while maintaining a compact overall device structure.
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement and different orientation angles for various antennas within the limited device volume. By positioning antennas at different angles and layers, the system maximizes signal isolation and bandwidth utilization without increasing device footprint.
2Productivity
If antenna bandwidth is increased, then communication efficiency is improved, but signal interference from metal enclosures worsens
Solution Approach 1:
The patent introduces RF-transparent materials and strategically positioned openings in the metal enclosure as intermediaries between the antennas and the external environment. These intermediaries allow wideband RF signals to pass through while blocking harmful interference from the metal enclosure, thereby maintaining communication efficiency across extended frequency ranges.
Solution Approach 2:
The metal enclosure is designed with localized RF-transparent regions at specific positions corresponding to antenna locations, while maintaining metallic shielding in other areas. This local modification allows targeted signal transmission without compromising overall device shielding effectiveness.
3Reliability
If device size is increased to accommodate antennas, then antenna performance is improved, but device portability deteriorates
Solution Approach 1:
The patent employs nested antenna designs where smaller antennas are positioned within or alongside larger antenna structures. This nesting approach allows multiple antenna functions to be packed into minimal space while maintaining the performance characteristics of each antenna type, thereby preserving device portability.
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
Enables efficient use of available space, enhances signal strength, and maintains device compactness by routing antennas and sensors through RF transparent features, optimizing power transfer and reducing signal interference.
Implementation Method 1
a radio frequency (RF) transparent interconnect that electrically connects the at least one antenna in the strap to at least one of the electronic components in the capsule
Implementation Method 2
The RF transparent interconnect may include a capacitive connection between the at least one antenna in the strap and one or more transmission lines in the capsule
Data Source
AI summary
The disclosed systems and mobile electronic devices may include a capsule that houses various electronic components. These systems may also include a cradle that is configured to removably couple with the capsule. Still further, these systems may include a strap connected to a first end of the cradle. The strap itself may include at least one antenna. The systems may also include a radio frequency (RF) transparent interconnect that electrically connects the antenna in the strap to at least one of the electronic components in the capsule. Various other methods of manufacturing, systems, and apparatuses are also disclosed.