Meandering Sensing Pad for Antenna Interference Reduction
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Solution Overview
Problem
The integration of a proximity sensor with an antenna element in mobile devices often leads to undesired resonant modes due to interference, affecting the antenna's performance and making it difficult to meet Specific Absorption Rate (SAR) requirements.
Innovation Solution
An electronic device design featuring a dielectric substrate with a meandering structure in the sensing pad, which reduces interference with the antenna elements by incorporating a meandering second connection element, allowing the antenna to cover multiple frequency bands while minimizing resonant mode interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a proximity sensor sensing pad is integrated with an antenna element in a mobile device, then the device can meet SAR requirements through proximity detection, but the sensing pad causes undesired resonant modes and negatively affects antenna performance
Solution Approach 1:
The sensing pad is segmented into multiple branches (first branch, second branch, third branch, fourth branch) connected through meandering connection elements. This segmentation allows the sensing pad to be electrically isolated from the antenna elements while maintaining proximity detection functionality, thereby eliminating undesired resonant modes.
Solution Approach 2:
The meandering connection elements serve as intermediary structures between the sensing pad branches and ground voltage. These connection elements with meandering structures provide electrical connection while maintaining physical separation and reducing electromagnetic coupling between the sensing pad and antenna elements, thus preventing harmful resonant interference.
2Loss of energy
If the sensing pad is designed with a meandering structure to reduce interference, then antenna radiation efficiency improves by 30%, but the device complexity increases due to the meandering connection elements
Solution Approach 1:
The connection elements are designed with meandering (curved/wavy) structures instead of straight lines. This meandering geometry increases the electrical path length and reduces electromagnetic coupling with the antenna elements, thereby improving antenna radiation efficiency by 30% while maintaining a planar structure that can be easily manufactured.
3Measurement precision
If the sensing pad branches are positioned to overlap with antenna elements in vertical projection, then proximity detection accuracy improves, but the interference with antenna elements increases
Solution Approach 1:
The sensing pad branches are positioned to overlap with antenna elements in the vertical projection (planar view) to maintain accurate proximity detection, but the meandering connection elements and ground coupling create electrical isolation in the third dimension (through the dielectric substrate). This dimensional separation allows the sensing pad to function accurately without interfering with antenna elements.
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 design enhances antenna radiation efficiency by approximately 30% and increases the detectable distance of the sensing pad by about 10%, improving the device's ability to pass SAR testing and supporting wideband operations such as LTE.
Implementation Method 1
a sensing pad of the proximity sensor tends to negatively affect the antenna element and even causes the antenna element to generate undesired resonant modes
Implementation Method 2
The first radiation element, the second radiation element, and the third radiation element are disposed on the first surface of the dielectric substrate. An antenna structure is formed by the first radiation element, the second radiation element, and the third radiation element
Data Source
AI summary
An electronic device includes a dielectric substrate, a first radiation element, a second radiation element, a third radiation element, and a sensing pad. The first radiation element includes a first branch, a second branch, and a first connection element. The first connection element is coupled between the first branch and the second branch. The second branch is coupled to a ground voltage. The second radiation element has a feeding point. The third radiation element is coupled to the feeding point. An antenna structure is formed by the first radiation element, the second radiation element, and the third radiation element. The sensing pad includes a third branch, a fourth branch, and a second connection element. The second connection element is coupled between the third branch and the fourth branch. The second connection element has a meandering structure.