Antenna Placement in Tablets Using Edge Zones
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Solution Overview
Problem
Arranging multiple antennas within a small form factor device, such as a tablet, is challenging due to interference issues, which limits product design and antenna performance, especially when common hand positions are considered.
Innovation Solution
Establishing an antenna zone along a particular edge of the device using non-interfering materials for the antennas, such as RF transparent materials, while employing other materials like metal in other regions to minimize interference and optimize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple antennas are placed in different edges of the device to avoid interference, then antenna performance is improved, but device design flexibility is reduced and material placement is restricted
Solution Approach 1:
Multiple antennas of different types (Wi-Fi, Bluetooth, NFC, cellular) are merged and co-located within a single antenna zone along one edge of the device, rather than being distributed across multiple edges. This consolidation maintains antenna performance through proper spacing and orientation while freeing other edges for design flexibility and material placement.
Solution Approach 2:
The patent transitions from a two-dimensional distribution of antennas across multiple edges to a one-dimensional linear arrangement along a single edge. This dimensional change allows antennas to be organized in a compact sequence (e.g., corner to corner along the top edge) that minimizes interference while releasing spatial constraints on other device surfaces.
2Object-affected harmful factors
If antennas are placed along multiple edges of the device, then interference between antennas is reduced, but the area available for other components and materials is decreased
Solution Approach 1:
All antennas are merged into a single designated zone along one edge of the device, concentrating the RF-transparent material requirement to a specific area. This allows the remaining majority of the device surface to be utilized for metal components, connectors, buttons, and speakers without concern for antenna interference.
Solution Approach 2:
The device structure is differentiated into two zones: an antenna zone with RF-transparent materials along one edge, and other regions with unrestricted materials like metal. This local quality differentiation allows optimal material selection in each zone while minimizing the impact on overall device area.
3Ease of operation
If antennas are placed near common hand positions, then device functionality is maintained, but antenna performance is adversely affected
Solution Approach 1:
The antenna zone is extracted and positioned at the top edge of the device, away from common hand positions at the bottom and sides. This extraction separates the antenna placement from user contact areas, ensuring that hands holding or typing on the device do not block or interfere with antenna operation.
4Adaptability or versatility
If the number of antennas is increased to support more wireless subsystems, then device functionality is improved, but antenna placement complexity and interference management become more difficult
Solution Approach 1:
Five different types of antennas (Wi-Fi, Bluetooth, NFC, and cellular antennas) are merged into a single antenna zone along the top edge of the device. This consolidation provides a structured framework for managing multiple antennas, where each type can be positioned sequentially with appropriate spacing and orientation to minimize mutual interference.
Solution Approach 2:
Within the antenna zone, different antenna types are segmented and positioned at specific locations (e.g., Wi-Fi and Bluetooth at one corner, NFC and cellular at the other corner). This segmentation allows each antenna type to be optimized for its specific frequency and radiation pattern while maintaining overall compactness.
Data Source
AI summary
Antenna placement techniques are described. In one or more embodiments, a computing device includes an antenna suite having multiple different kinds of antennas. An antenna zone for the antenna suite may be established along a particular edge of the computing device. Non-interfering materials (e.g., RF transparent material) may be used within the antenna zone and other materials (e.g., metal) may be employed for other regions of the device. The multiple different kinds of antennas in the antenna suite may then be disposed within the established antenna zone. The antennas may be placed to minimize interference between antennas and/or achieve performance objective for the suite of antennas. In one approach, a suite of five antennas may be placed along a top edge of a computing device in a landscape orientation.