Antenna Module Proximity Sensor Overlap for SAR Compliance
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Solution Overview
Problem
Conventional electronic apparatuses face challenges in maintaining safe electromagnetic radiation levels while ensuring communication quality, as existing sensing systems have a limited range and cannot effectively detect radiation at the central part of the antenna, making it difficult to comply with safety standards like SAR and TRP.
Innovation Solution
An antenna module with a circuit board, proximity sensor, and sensing antenna patch is designed, where the proximity sensor is mounted on the bottom surface and electrically connected to the sensing antenna patch, which is assembled on the inner surface of the housing, allowing for an enlarged sensing range and improved radiation performance by overlapping the communication antenna pattern's orthogonal projection with the sensing antenna patch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensors are used at both ends of the communication antenna to detect distance, then the SAR value can be maintained within safe range, but the sensing range is limited and the central part of the antenna cannot be detected
Solution Approach 1:
The patent transitions from a one-dimensional sensing approach (only at both ends of the antenna) to a two-dimensional coverage by placing sensing antenna patches across the entire antenna surface, including the central part. This dimensional expansion enables comprehensive detection of the electromagnetic field distribution throughout the antenna structure, resolving the limitation of restricted sensing range while maintaining SAR safety compliance.
Solution Approach 2:
The patent divides the antenna surface into multiple sensing zones by placing multiple sensing antenna patches at different locations, including both ends and the central part of the communication antenna. Each patch independently detects the electromagnetic field in its local region, and the combined data provides comprehensive coverage of the entire antenna structure, thereby expanding the overall sensing range.
2Adaptability or versatility
If the sensing antenna patch is placed on the housing inner surface overlapping the communication antenna pattern, then the sensing range is enlarged, but the device complexity increases
Solution Approach 1:
The patent merges the sensing antenna patches with the existing communication antenna structure by placing them on the same housing inner surface where the communication antenna pattern is formed. The sensing patches utilize the same electromagnetic field environment as the communication antenna, allowing them to detect field distribution without requiring separate sensing structures, thereby expanding sensing range while minimizing additional complexity.
Solution Approach 2:
The housing inner surface serves multiple functions: it acts as the mounting surface for the communication antenna pattern and simultaneously as the substrate for the sensing antenna patches. This multi-functional use of the housing inner surface allows the sensing system to leverage the existing structural space, expanding sensing coverage without proportionally increasing device complexity.
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
This configuration enhances the sensing range to meet safety requirements while maintaining communication quality by allowing the electronic apparatus to adjust radiation power based on object proximity, ensuring compliance with safety standards and optimal communication performance.
Implementation Method 1
The sensing antenna patch is assembled on the inner surface of the housing and electrically connected to the proximity sensor
Implementation Method 2
sensors are used in collaboration with the sensing antennas to detect a distance between the electronic apparatus and human body
Data Source
AI summary
An antenna module and an electronic apparatus are provided. The electronic apparatus includes a housing and the antenna module. The housing has an inner surface. The antenna module includes a circuit board, a proximity sensor and a sensing antenna patch. The circuit board is disposed in the housing, and has a top surface and a bottom surface opposite to the top surface. The circuit board has a communication antenna pattern on the top surface. The proximity sensor is mounted on the bottom surface. The sensing antenna patch is assembled on the inner surface of the housing and electrically connected to the proximity sensor. An orthogonal projection of the communication antenna pattern on the inner surface overlaps the sensing antenna patch on the inner surface.