Decoupling HPRF Module from Handheld Device to Reduce RF Exposure
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Solution Overview
Problem
Current wireless devices pose a safety hazard due to high exposure to radio frequency radiation, as measured by Specific Absorption Rate (SAR), which existing solutions have not adequately addressed, especially when used in close proximity to the human body or head.
Innovation Solution
The system decouples and duplicates the high power radio frequency (HPRF) module with its associated antenna from the wireless device, using a low power communications link to maintain connectivity while placing the HPRF-LPC device at a distance from the human head, utilizing ultra-wideband technologies to reduce SAR levels to 0.16 W/kg or lower.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the HPRF module is integrated into the wireless device, then communication functionality is maintained, but RF exposure to human increases
Solution Approach 1:
The system divides the wireless communication system into two separate devices: a low-power communications (LPC) wireless device that the user holds, and a high-power radio frequency-low power communications (HPRF-LPC) device that remains at a distance from the user. The HPRF module is extracted from the handheld device and placed in a separate stationary or wearable device, segmenting the RF radiation source from the user's body while maintaining communication functionality through the paired devices working together.
Solution Approach 2:
The HPRF module along with its associated antenna is extracted from the handheld wireless device and placed in a separate HPRF-LPC device that can be positioned away from the user's head and body. This extraction removes the primary RF radiation source from proximity to the user, directly reducing SAR exposure while the extracted module continues to provide high-power communication capabilities through the paired connection.
2Object-affected harmful factors
If the HPRF module is placed at a distance from the human head, then SAR value is reduced, but device complexity increases
Solution Approach 1:
The system merges the LPC wireless device with the HPRF-LPC device through a low-power communications link, creating a unified communication system where the two devices work together as a single logical unit. This merging allows the system to function as one integrated communication solution while physically separating the HPRF module from the user, reducing SAR without requiring completely separate independent systems.
Solution Approach 2:
The LPC wireless device acts as an intermediary between the user and the HPRF-LPC device. It receives user input and relays it to the HPRF module through the LPC link, while the HPRF module processes the high-power transmission. This intermediary role allows the system to maintain simple user interaction while managing the complexity of the distributed architecture behind the scenes.
3Object-affected harmful factors
If protective materials are used to reduce RF energy, then RF protection is provided, but antenna radiation pattern is negatively impacted
Solution Approach 1:
Instead of placing protective materials around the antenna in the handheld device (which would interfere with the radiation pattern), the HPRF module with its antenna is extracted and placed in a separate HPRF-LPC device that can be positioned away from the user's body. This extraction eliminates the need for protective materials that would compromise antenna performance, as the physical distance alone provides sufficient SAR reduction while maintaining optimal antenna radiation characteristics.
Data Source
AI summary
The present invention for reducing exposure of human to radio frequency radiation comprising a wireless device which comprises a high power radio frequency (HPRF) module, and a low power communications (LPC) module coupled to a switch and further coupled to a control unit and to the baseband unit or to the application processor of the hybrid wireless device; and a high power radio frequency-low power communications (HPRF-LPC) device which comprises a high power radio frequency (HPRF) module coupled to a processor and further coupled to a low power communications (LPC) module. Replication of the HPRF module in the wireless device and its function into the HPRF-LPC device enables communications between the HPRF-LPC device located at a distance away from the human head with a base station and reduces RF energy exposure. The present invention significantly reduces the RF exposure contributing to head SAR of 0.16 W/kg or lower averaged over one gram of tissue.