Grip Sensor Antenna Layout for SAR-Compliant Power Gain
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Solution Overview
Problem
Existing wireless communication devices face limitations in transmission power due to specific absorption rate (SAR) constraints, and the addition of a grip sensor complicates the recognition distance, affecting radiation performance and SAR compliance.
Innovation Solution
An electronic device design incorporating a first antenna, a second antenna connected via a feeding line, a grip sensor, and an inductor to extend the recognition distance and improve radiation performance while maintaining SAR compliance, using a segmented antenna pattern and capacitors for antenna matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If transmission power is increased to improve radiation performance, then radiation performance is improved, but SAR value increases and may exceed compliance limits
Solution Approach 1:
The patent implements dynamic transmission power adjustment based on real-time grip sensor feedback. The system continuously monitors the recognition distance between the device and human body, and dynamically modifies transmission power levels accordingly. When the grip sensor detects a shorter recognition distance, the system reduces transmission power to maintain SAR compliance, and when the distance increases, the system can increase power to improve radiation performance.
Solution Approach 2:
The patent employs a feedback mechanism where the grip sensor continuously provides information about the recognition distance to the transmission power control system. This closed-loop feedback enables the system to automatically adjust transmission power based on the actual spatial relationship with the human body, ensuring SAR compliance while maximizing radiation performance within safe limits.
2Length of stationary object
If grip sensor recognition distance is extended to improve radiation performance, then radiation performance is improved, but the device may output maximum transmission power at distances that exceed SAR measurement specifications
Solution Approach 1:
The system dynamically adjusts transmission power based on the actual recognition distance detected by the grip sensor. Even though the recognition distance is extended, the transmission power is continuously modified to ensure that at any given distance, the SAR value remains within compliance limits. This dynamic adjustment prevents the device from outputting maximum power at distances that would exceed SAR specifications.
Solution Approach 2:
The extended recognition distance system incorporates feedback control where the grip sensor's detection of human body proximity triggers automatic transmission power reduction. This feedback mechanism ensures that regardless of the extended recognition distance, the transmission power is always adjusted to maintain SAR compliance, preventing harmful electromagnetic exposure.
3Power
If a segmented antenna pattern is used to improve radiation performance, then radiation performance is improved, but device complexity increases
Solution Approach 1:
The patent divides the antenna system into multiple segments or elements with different radiation patterns. Each antenna segment can be independently controlled or activated based on the operational requirements and grip sensor feedback. This segmentation allows the system to optimize radiation performance for different frequency bands and transmission scenarios while managing overall system complexity through modular design.
Solution Approach 2:
The segmented antenna structure is designed to serve multiple functions across different frequency bands and operational modes. By making the antenna system multi-functional, the patent reduces the need for completely separate antenna systems for different purposes, thereby improving radiation performance while controlling the increase in device complexity through universal design principles.
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 extended recognition distance allows for increased maximum transmission power, enhancing radiation performance and securing a larger SAR margin without significant power consumption changes.
Implementation Method 1
an inductor electrically connecting the first antenna and the second antenna to each other
Implementation Method 2
at least one capacitor configured to match the first antenna and the second antenna
Implementation Method 3
The grip sensor may be configured to sense a user approaching the electronic device, based on an amount of a change in a capacitance of the sensing pad
Data Source
AI summary
An electronic device for performing wireless communication includes: a feeding line; a first antenna; a second antenna connected to the first antenna through the feeding line; a grip sensor disposed adjacent to and connected to the first antenna; at least one capacitor configured to match the first antenna and the second antenna; and an inductor electrically connecting the first antenna and the second antenna to each other.