Multiple-Band Antenna Corner Positioning for SAR Reduction
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Solution Overview
Problem
The challenge in cellular device design is to miniaturize multi-functional devices while minimizing the specific absorption rate (SAR) and maintaining hearing aid compatibility, as internal antennas are close to the user's head and can cause interference with other components.
Innovation Solution
A multiple-band antenna design for mobile wireless communications devices featuring a dielectric substrate with electrically conductive traces forming a primary and secondary radiator, spaced apart to operate across various frequency bands with low correlation, exploiting characteristic modes for reduced SAR and improved ergonomics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If internal antennas are used to reduce device size, then device footprint is reduced, but specific absorption rate (SAR) increases
Solution Approach 1:
The patent positions the antenna at the corner of the device housing, utilizing three-dimensional spatial arrangement rather than planar placement. This corner positioning creates maximum distance from the user's head in multiple directions, effectively reducing SAR while maintaining compact device dimensions.
Solution Approach 2:
The patent introduces a ground plane structure as an intermediary element between the antenna and other device components. This ground plane serves as a shielding barrier that reduces electromagnetic interference with other components while also helping to control the antenna radiation pattern to minimize head exposure.
2Ease of operation
If internal antennas are used to improve ergonomics, then ease of operation is improved, but hearing aid compatibility deteriorates
Solution Approach 1:
The corner positioning of the antenna in three-dimensional space creates optimal separation from the user's ear and hearing aids during typical device usage, improving hearing aid compatibility while maintaining ergonomic design.
3Adaptability or versatility
If multiple antennas are installed to support multi-functionality, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent designs a single antenna structure that can operate across multiple frequency bands and support different communication functions. The antenna is configured with multiple feed points and can be selectively activated depending on the required function, eliminating the need for separate dedicated antennas for each function.
Solution Approach 2:
The patent combines multiple antenna functions into a single integrated antenna structure with multiple feed points. This unified design reduces the total number of antenna components while maintaining support for multiple communication standards and frequency bands.
4Volume of moving object
If internal antennas are used to reduce device size, then volume is reduced, but interference with other components increases
Solution Approach 1:
The patent introduces a ground plane structure as an intermediary element between the antenna and other device components. This ground plane serves as a shielding barrier that reduces electromagnetic interference with other components while also helping to control the antenna radiation pattern.
Solution Approach 2:
The corner positioning of the antenna in three-dimensional space naturally provides spatial separation from other components housed in the device, reducing interference while maintaining compact overall device size.
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
The solution enables efficient operation across multiple frequency bands with low correlation, reducing SAR and interference, thus enhancing device usability and compatibility while maintaining a compact form factor.
Implementation Method 1
A multiple-band antenna design for mobile wireless communications devices featuring a dielectric substrate with electrically conductive traces forming a primary and secondary radiator, spaced apart to operate across various frequency bands with low correlation, exploiting characteristic modes for reduced SAR
Data Source
AI summary
A mobile wireless communications device may include a housing, a wireless transceiver carried by the housing and having a primary output, and a secondary output, and a multiple-band antenna carried by the housing and coupled to the wireless transceiver. The multiple-band antenna may include a dielectric substrate and a pattern of electrically conductive traces thereon defining a primary radiator and a secondary radiator spaced apart from the primary radiator. The primary radiator may include a first elongate member having a primary feed coupled to the primary output, and a first reference member spaced from the first elongate member and at least partially laterally surrounding the first elongate member and coupled to a reference voltage. The secondary radiator may include a second elongate member having a secondary feed coupled to the secondary output.