Mobile Device Speaker Antenna Integration for Wideband Operation
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Solution Overview
Problem
Designing a wideband antenna element that is small in size is challenging due to the limited inner space of mobile devices, which affects their wireless communication capabilities across various frequency bands.
Innovation Solution
Integrating an antenna element with a speaker element, where the antenna forms a 3D structure using separate radiation elements and a coupling gap, along with a tuning circuit and matching circuits to cover frequency bands from 700 MHz to 3000 MHz, allowing for LTE wideband operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wideband antenna element is designed to cover multiple frequency bands, then the wireless communication capability is improved, but the antenna size increases and cannot be accommodated in the limited inner space of mobile devices
Solution Approach 1:
The antenna element is integrated within the speaker element structure. The radiation elements are disposed inside the speaker element's nonconductive portion, utilizing the existing space of another component rather than adding separate antenna space. This nesting approach allows the antenna to be accommodated within the limited inner space of the mobile device while maintaining wideband operation capability across multiple frequency bands
Solution Approach 2:
The antenna design transitions from a planar 2D structure to a three-dimensional configuration by extending radiation elements across multiple surfaces (first surface and second surface) of the speaker element. This 3D arrangement allows for more complex radiation patterns and impedance matching networks to be packed into a compact volume, enabling wideband operation without proportionally increasing the overall antenna footprint
2Volume of moving object
If the antenna element is made compact to fit limited space, then the device size is reduced, but it becomes difficult to achieve wideband operation across multiple frequency bands
Solution Approach 1:
The antenna element is divided into multiple separate radiation elements (first radiation element and second radiation element) with distinct functions. The first radiation element extends across surfaces for primary radiation, while the second radiation element provides coupling and impedance matching. This segmentation allows each element to be optimized for specific frequency ranges, collectively achieving wideband operation from 700 MHz to 3000 MHz within a compact structure
Solution Approach 2:
The speaker element's nonconductive portion serves dual purposes: as the speaker housing structure and as the substrate for mounting the antenna radiation elements. The coupling gap between radiation elements serves both as a physical separator and as an impedance matching mechanism. This multi-functionality reduces the overall device volume by eliminating separate components while maintaining wideband communication capabilities
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 a compact antenna design that supports wideband operation while reducing Specific Absorption Rate (SAR) and maintaining efficient impedance matching across the specified frequency bands.
Implementation Method 1
The antenna element includes a signal source, a first radiation element, and a second radiation element. The signal source is coupled to a feeding point. The first radiation element is coupled to the feeding point. The second radiation element is coupled to the feeding point.
Data Source
AI summary
A mobile device includes a speaker element and an antenna element. The speaker element includes a conductive portion and a nonconductive portion. The nonconductive portion has a first surface and a second surface which are opposite to each other. The antenna element is adjacent to the nonconductive portion. The antenna element includes a signal source, a first radiation element, and a second radiation element. The signal source is coupled to a feeding point. The first radiation element is coupled to the feeding point. The first radiation element extends from the first surface onto the second surface. The second radiation element is coupled to the feeding point. The second radiation element is disposed on the second surface. The second radiation element is separate from the first radiation element. A coupling gap is formed between the first radiation element and the second radiation element.