A Wearable Button Antenna Sensor for Dual-Mode Wireless Information and Power Transfer

Area of Science:

• Wearable antenna design
• Wireless power transfer
• Biomedical sensors

Background:

• Simultaneous wireless information and power transfer (SWIPT) is crucial for next-generation wearable devices.
• Existing solutions often face challenges in efficiency and integration.
• On-body communication and off-body energy harvesting require specialized antenna designs.

Purpose of the Study:

• To propose a novel wearable button antenna sensor for SWIPT.
• To optimize transfer efficiency for both information and power.
• To validate the performance through prototyping and measurements.

Main Methods:

• Design and simulation of a button antenna sensor with dual-band functionality.
• Integration of an artificial magnetic conductor (AMC) for a low-profile and stable design.
• Prototyping and experimental validation of the antenna sensor's performance.

Main Results:

• Achieved omni-directional radiation in the 3.5 GHz WiMAX band for on-body communication.
• Obtained circularly polarized broadside radiation in the 5 GHz WLAN band for power harvesting.
• Demonstrated high radiation efficiency (>80%) and low specific absorption rate (SAR) below safety limits.

Conclusions:

• The proposed wearable button antenna sensor effectively supports SWIPT.
• The design offers efficient on-body information transmission and off-body energy harvesting.
• The validated concept is suitable for advanced wearable technology integration.