Antenna Structure with Proximity Sensing for SAR Compliance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional antenna structures for portable devices, such as hybrid laptops, fail to meet regulatory SAR limits when operating in tablet mode, and existing solutions that enhance antenna efficiency often elevate SAR values excessively, posing health risks to users.
Innovation Solution
An antenna structure comprising a substrate, radiation elements, a coupling element, a grounding element, and a feeding element, with a System in Package (SIP) component and a proximity sensing circuit, which adjusts transmission power based on user proximity to prevent high SAR values while maintaining efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If antenna efficiency is increased through conventional technologies, then radiation efficiency is improved, but SAR value increases excessively
Solution Approach 1:
The patent implements a proximity sensing circuit that dynamically detects user proximity to the antenna and adjusts transmission power in real-time. When a user is detected in proximity, the system automatically reduces transmission power to maintain SAR compliance while preserving antenna efficiency when no user is present
Solution Approach 2:
The system changes the operating parameter (transmission power) based on detected conditions. The proximity sensing circuit measures capacitance changes to determine user proximity, and the control system adjusts power levels accordingly, transforming a static antenna system into one with adaptive parameter control
2Adaptability or versatility
If two grounded capacitors are added for proximity sensing, then sensing capability is achieved, but antenna characteristics and sensing distance are degraded
Solution Approach 1:
The patent integrates multiple functions into the antenna structure itself. The coupling element serves dual purposes: it acts as both a resonant element for antenna operation and as a sensing electrode for proximity detection. This eliminates the need for separate sensing components that would interfere with antenna performance
Solution Approach 2:
The proximity sensing function is merged with the antenna structure by using the coupling element as the sensing electrode. The sensing circuit connects to the coupling element, combining the radiation function and sensing function into a unified structure that avoids the drawbacks of separate capacitor-based sensing solutions
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 proposed antenna structure increases performance while ensuring SAR values remain within safe limits, effectively balancing efficiency and user safety by dynamically adjusting transmission power in response to user proximity.
Implementation Method 1
The coupling element is separated from the coupling portion and coupling to the coupling portion
Implementation Method 2
The coupling portion serves as a sensing electrode for the proximity sensor circuit to measure a capacitance
Implementation Method 3
The first radiation element is disposed on the substrate, including a first radiation portion, a second radiation portion, and a feeding portion connected between the first radiation portion and the second radiation portion
Data Source
AI summary
The instant disclosure provides an antenna structure including a substrate, a first radiation element, a second radiation element, a coupling element, a grounding element, and a feeding element. The first radiation element is disposed on the substrate, including a first radiation portion, a second radiation portion, and a feeding portion connected between the first radiation portion and the second radiation portion. The second radiation element is disposed on the substrate, including a third radiation portion and a coupling portion connected with the third radiation portion. A gap is formed between the first radiation portion and the third radiation portion. The coupling element is disposed on the substrate. The coupling element is separated from the coupling portion and coupling to the coupling portion. The grounding element is coupled with the coupling element. The feeding element is coupled with the feeding portion and the grounding element.