Split Multi-Band Internal Antenna Architecture for Mobile Devices
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Solution Overview
Problem
Conventional internal antenna designs for mobile computing devices face challenges in achieving efficient multi-band operation while maintaining compliance with SAR limits and compact form factors, often resulting in reduced performance and increased SAR values above regulatory limits.
Innovation Solution
A split multi-band/single sub-band internal antenna architecture is implemented, comprising two internal antenna elements: one for downlink UMTS operations in the 2100 MHz frequency band and another for tri-band GSM operation in the 850/1800/1900 MHz frequency bands, or 900/1800/1900 MHz frequency bands, allowing for efficient coverage of all four frequency bands with improved SAR performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional internal antenna designs (PIFA or paper-clip) are used, then the device can achieve basic antenna functionality, but the SAR value exceeds the FCC limit of 1.6 mW/g
Solution Approach 1:
The patent divides the antenna system into multiple separate antenna elements (first internal antenna element, second internal antenna element, third internal antenna element) instead of using a single conventional antenna. Each element is optimized for specific frequency bands, allowing better control of electromagnetic radiation distribution and SAR reduction while maintaining multi-band functionality and regulatory compliance.
Solution Approach 2:
The patent applies different design configurations to different antenna elements positioned at different locations within the device. Each antenna element has optimized characteristics for its specific position and frequency band requirements, enabling localized optimization of radiation patterns to reduce SAR while maintaining overall system performance and compliance.
2Adaptability or versatility
If antenna elements are added to cover all four frequency bands, then frequency band coverage is improved, but device complexity increases
Solution Approach 1:
The patent designs antenna elements that can operate across multiple frequency bands (GSM 850/1800/1900 and UMTS 2100) to provide universal coverage. The second internal antenna element specifically supports tri-band GSM operation, while the first and third elements handle downlink UMTS and other bands, allowing the system to achieve multi-band functionality through specialized elements working together rather than requiring all elements to cover all bands.
Solution Approach 2:
The patent segments the frequency band coverage responsibility among different antenna elements. Instead of one complex antenna trying to cover all bands, each element is optimized for specific bands (e.g., first element for downlink UMTS 2100, second element for GSM 850/1800/1900, third element for other bands), simplifying the design of individual elements while achieving comprehensive multi-band coverage collectively.
3Volume of moving object
If compact form factor is maintained, then device size is reduced, but antenna performance and SAR compliance become more difficult to achieve
Solution Approach 1:
The patent utilizes three-dimensional space within the compact device by positioning antenna elements at different locations and orientations (first element near top, second element near bottom, third element at different position). This spatial distribution allows each element to have adequate radiation space despite the compact overall device form factor, maintaining performance and SAR compliance through intelligent 3D arrangement rather than increasing device size.
Solution Approach 2:
The patent integrates multiple antenna elements within the compact device housing by nesting them in different internal spaces. The antenna elements are positioned to coexist within the limited volume, with each element utilizing different spatial zones and radiation patterns to achieve adequate performance without increasing the external dimensions of the device.
Data Source
AI summary
Various embodiments of an internal multi-band antenna architecture for a mobile computing device are described. An internal antenna architecture for a mobile computing device may include multiple antenna elements, including a first internal antenna element configured to operate in a downlink frequency sub-band of at least one frequency band for communication in a first mode, and a second internal antenna element configured to operate in an uplink frequency sub-band of the at least one frequency band for communication in the first mode. Other embodiments are described and claimed.