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Ultra-Miniaturized Dual-Band MIMO Antenna for Biomedical Implantable Devices in Wireless Health Monitoring Systems
Tahir Bashir1, Shunbiao Chen1, Guanjie Feng1
1College of Integrated Circuit Science and Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, China.
Biosensors
|March 27, 2026
Summary
This study introduces an ultra-miniaturized four-port dual-band multi-input multi-output (MIMO) antenna for implantable medical devices. The novel antenna design supports reliable wireless communication for biomedical telemetry and power transfer applications.
Area of Science:
- Biomedical Engineering
- Antenna Theory
- Wireless Communications
Background:
- Wireless communication is crucial for modern implantable medical devices.
- Existing antennas often face challenges with miniaturization, dual-band operation, and performance within the human body.
- The need for efficient data telemetry and wireless power transfer in devices like capsule endoscopies and pacemakers is increasing.
Purpose of the Study:
- To propose and validate an ultra-miniaturized four-port dual-band MIMO antenna for wireless biomedical implantable devices.
- To evaluate the antenna's performance in both simulated and realistic human body environments.
- To confirm its suitability for wireless power transfer and high-data rate telemetry.
Main Methods:
- Design of a partial meandered structure for miniaturization (8 × 6.4 × 0.5 mm³).
- Full-wave electromagnetic simulation of the antenna within homogeneous and heterogeneous body phantoms (large intestine, heart).
- Analysis of key performance metrics including reflection coefficients, gain, impedance bandwidth, mutual coupling, SAR, and link budget.
Main Results:
- Achieved excellent performance with reflection coefficients below -30 dB and gains up to -17.5 dBi.
- Demonstrated -10 dB impedance bandwidths of 170 MHz and 370 MHz at 1.4 GHz and 2.45 GHz, respectively.
- Confirmed reliable communication (>20 m range, up to 100 Mbps) and safety (SAR compliance), with strong MIMO channel parameter performance.
Conclusions:
- The proposed ultra-miniaturized, dual-band MIMO antenna is highly suitable for wireless biomedical implants.
- Its performance characteristics, including isolation and radiation pattern, make it ideal for wireless health monitoring systems.
- The antenna design offers a promising solution for advanced implantable medical device communication.
