Development of flexible durable multi-slotted antenna for wearable applications.

Area of Science:

• Electromagnetics and Antenna Design
• Wearable Technology
• Materials Science

Background:

• Flexible materials are increasingly vital for wearable antennas in body area networks (BAN).
• Existing flexible substrates present limitations in thermal stability and environmental resistance.
• Wearable devices require compact antennas for seamless integration and reliable signal transmission.

Purpose of the Study:

• To design and characterize a compact, multi-slotted antenna for wearable applications.
• To utilize a flexible, durable silicone rubber substrate for enhanced performance and environmental resilience.
• To evaluate the antenna's performance, including gain, efficiency, and specific absorption rate (SAR), under various conditions.

Main Methods:

• A multi-slotted antenna was designed and fabricated on a silicone rubber substrate.
• The antenna's performance was simulated and measured, focusing on resonance frequency, gain, and radiation efficiency.
• Specific absorption rate (SAR) was calculated to ensure compliance with FCC standards.
• Bending characteristics were analyzed to assess performance stability.

Main Results:

• The designed antenna exhibits a compact size (14 × 12 × 2 mm³) and resonates at 5.8 GHz with a peak gain of 2.46 dBi.
• The antenna achieves a radiation efficiency of approximately 80% over the 5.5–6.5 GHz band when loaded with a hand model.
• The achieved SAR value of 1.56 W/kg (for 1g of tissue) meets FCC standards.
• The multi-slotted antenna demonstrates stable performance even when subjected to bending.

Conclusions:

• The proposed multi-slotted antenna, fabricated on a silicone rubber substrate, offers a compelling solution for wearable applications.
• Its compact size, high radiation efficiency, and stable performance under bending make it suitable for diverse uses.
• Potential applications include military, medical, GPS, RFID, and fitness tracking devices.