Packaging and Integration of a Dual-Polarized MIMO Antenna with Pattern Diversity for Dual-Camera Wireless Capsule...

Area of Science:

• * Biomedical Engineering
• * Wireless Communications
• * Medical Imaging

Background:

• * Dual-camera wireless capsule endoscopy offers improved gastrointestinal diagnostic coverage.
• * Challenges include antenna placement, electromagnetic coupling, and reliable in-body communication.
• * Existing solutions face limitations in lossy biological environments and orientation variability.

Purpose of the Study:

• * To present a compact, camera-integrated, dual-polarized multiple-input multiple-output (MIMO) antenna for dual-camera capsule endoscopy.
• * To enhance in-body wireless communication reliability and mitigate orientation-dependent fading.
• * To provide a robust solution for next-generation gastrointestinal diagnostics.

Main Methods:

• * Design of a four-element dual-polarized MIMO antenna operating at 868 MHz.
• * Integration of two planar MIMO antenna modules with opposing cameras for polarization and pattern diversity.
• * Utilization of slot-loaded half-annular patch elements for stable impedance and dual polarization.
• * Experimental validation using tissue-mimicking phantoms and specific absorption rate (SAR) analysis.

Main Results:

• * Achieved antenna isolation > 23 dB and envelope correlation coefficients < 0.03.
• * Demonstrated diversity gain > 9.9 dB and realized gain of -33.7 dBi per element.
• * Confirmed robust impedance stability across gastrointestinal tissues and a link margin > 20 dB.
• * SAR analysis confirmed safety compliance with IEEE limits.

Conclusions:

• * The proposed camera-aware antenna integration offers a compact and reliable solution for dual-camera capsule endoscopy.
• * Enhanced wireless telemetry supports robust in-body communication under challenging conditions.
• * This advancement facilitates improved diagnostic accuracy and patient outcomes in gastrointestinal imaging.