Antenna Group Power Control for SAR-Compliant Call Modes
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Solution Overview
Problem
Existing electronic devices face challenges in managing electromagnetic wave emissions to comply with SAR and power density regulations, particularly when in close proximity to the human body, leading to potential health risks and unnecessary communication performance degradation.
Innovation Solution
The electronic device adjusts transmission power for multiple antenna groups based on specific power control conditions, distinguishing between situations where power control is necessary (e.g., near the head) and unnecessary (e.g., using a speakerphone), using sensors to identify grip states and applying SAR backoff operations only when needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If transmission power is limited to comply with SAR and power density regulations, then electromagnetic wave emissions are controlled, but communication performance deteriorates
Solution Approach 1:
The patent divides the antenna system into multiple antenna groups with different spatial orientations. Each antenna group is independently controlled based on its specific radiation characteristics and proximity to body parts. This allows selective power adjustment for individual antenna groups rather than uniform power reduction across all antennas, thereby maintaining communication performance while controlling electromagnetic wave emissions in directions where they are most likely to affect the human body.
Solution Approach 2:
The system dynamically determines power control conditions based on real-time sensor inputs (proximity sensors, grip detection sensors) that detect whether the device is near body parts. The transmission power is adjusted dynamically according to the detected usage scenario - applying power control only when necessary (e.g., when held near the head or body) and maintaining full power when not in close proximity, thus resolving the contradiction between emission control and performance maintenance.
2Object-affected harmful factors
If power control operations are applied to all antenna groups, then electromagnetic wave emissions are controlled, but communication performance unnecessarily degrades
Solution Approach 1:
Different power control conditions are configured for different antenna groups based on their specific radiation patterns and proximity to body parts. The system identifies which antenna groups actually require power control and applies it only to those, leaving other antenna groups operating at full power. This selective approach prevents unnecessary communication performance degradation while still controlling electromagnetic wave emissions where needed.
Solution Approach 2:
Instead of applying power control uniformly to all antenna groups (excessive action), the system applies power control only to the specific antenna groups that require it based on detected usage conditions (partial action). This avoids the unnecessary performance degradation that would result from blanket power reduction across the entire antenna system.
3Object-affected harmful factors
If transmission power is reduced to meet SAR reference values, then human body absorption is limited, but wireless communication is blocked or limited
Solution Approach 1:
The system uses sensors to dynamically detect whether the device is in close proximity to body parts and whether power control conditions are met. Transmission power is reduced only when the sensor detects that the device is near the body and SAR limits would be exceeded. When the device is not near the body or usage patterns indicate low risk, full transmission power is maintained, ensuring wireless communication remains available without unnecessarily limiting it.
Solution Approach 2:
The patent applies power control selectively to specific antenna groups that are oriented toward or in close proximity to body parts, while other antenna groups continue operating at full power. This spatially differentiated approach ensures that wireless communication availability is maintained through alternative antenna groups even when power control is applied to certain groups for SAR compliance.
Data Source
AI summary
An electronic device includes: at least one first antenna included in a first antenna group; at least one second antenna included in a second antenna group; a communication circuit operatively connected to the at least one first antenna and the at least one second antenna; a sensor; a memory; and a processor connected to the communication circuit, the sensor, and the memory. The electronic device may identify the state of the electronic device by using the sensor based on a call reception. The processor may identify whether a power control condition configured for at least one of the first antenna group and the second antenna group is satisfied. The processor may adjust a transmission power supplied to at least one antenna included in an antenna group in which a power control condition is satisfied in response to a situation in which the power control condition is satisfied.