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A Simulation Study of Triband Low SAR Wearable Antenna
Wazie M Abdulkawi1, Asad Masood2, N Nizam-Uddin2,3
1Department of Electrical Engineering, College of Engineering in Wadi Addawasir, Prince Sattam Bin Abdulaziz University, Wadi Addawasir 11991, Saudi Arabia.
Micromachines
|July 8, 2023
Summary
This study introduces a novel flexible antenna operating at 2.45 GHz, 5.8 GHz, and 8 GHz for ISM, WLAN, and X-band applications. The antenna demonstrates high efficiency and low specific absorption rate (SAR) values, ensuring safety.
Area of Science:
- Electromagnetics and Antenna Design
- Wireless Communication Systems
- Biomedical Engineering (SAR analysis)
Background:
- Industrial, Scientific, and Medical (ISM) and Wireless Local Area Network (WLAN) applications require robust antenna solutions.
- X-band frequencies are crucial for various advanced communication systems.
- Existing flexible antennas may face challenges in multi-band operation and safety compliance.
Purpose of the Study:
- To design and simulate a flexible antenna capable of operating across multiple frequency bands (2.45 GHz, 5.8 GHz, 8 GHz).
- To evaluate the antenna's performance, including reflection coefficient, efficiency, and gain.
- To assess the specific absorption rate (SAR) and analyze performance under deformation.
Main Methods:
- Antenna design utilizing a flexible Kapton polyimide substrate (1.8 mm thickness, permittivity 3.5).
- Full-wave electromagnetic simulations performed using CST Studio Suite.
- Specific absorption rate (SAR) simulations conducted using a three-layered phantom; deformation tests simulated.
Main Results:
- Achieved reflection coefficient below -10 dB across all target frequency bands (2.45 GHz, 5.8 GHz, 8 GHz).
- Demonstrated high antenna efficiency (up to 83%) and appropriate gain values.
- Recorded SAR1g values (0.34, 1.45, 1.57 W/Kg) well below the FCC limit of 1.6 W/Kg.
Conclusions:
- The proposed flexible antenna successfully operates in multiple frequency bands relevant to ISM, WLAN, and X-band applications.
- The design exhibits excellent performance characteristics and maintains SAR levels within safety standards, even under simulated deformation.
- This flexible antenna presents a promising solution for versatile wireless communication systems requiring adaptability and safety.
