Flexible Antenna Design on PDMS Substrate for Implantable Bioelectronics Applications.

Area of Science:

• Biomedical Engineering
• Electromagnetics
• Antenna Design

Background:

• Implantable antennas are crucial for wireless medical devices.
• Existing designs often face challenges with flexibility, bandwidth, and performance in biological environments.
• Circular polarization is desirable for robust signal transmission in vivo.

Purpose of the Study:

• To present a novel flexible, circularly polarized antenna for biomedical implants.
• To evaluate its performance in simulated biological tissues.
• To address the need for high-performance, adaptable antennas in implantable systems.

Main Methods:

• A new flexible antenna model with a square ground and small gap was designed.
• Passive components were used for impedance matching and circular polarization.
• Simulations were conducted using single-layer and multi-layer pork tissue models.
• Prototype performance was tested in a tissue model.

Main Results:

• The antenna achieved a wide axial ratio bandwidth of 250 MHz (2.28–2.53 GHz).
• Simulations in single and multi-layer tissue models predicted antenna performance.
• The prototype demonstrated a measured impedance bandwidth of 500 MHz in the 2.4 GHz ISM band.
• The antenna exhibits low-profile characteristics.

Conclusions:

• The proposed flexible, circularly polarized antenna meets key requirements for biomedical implantable applications.
• The design shows promising performance in simulated biological environments.
• This work contributes to the advancement of wireless communication for medical implants.