Wearable Antennas for Health Monitoring Systems

Wearable antennas form the backbone of modern wireless health monitoring, yet most published work treats them in isolation — evaluating RF performance on a bench or phantom without connecting antenna choices to actual clinical outcomes. This paper takes a different approach. Rather than reviewing antenna designs in a vacuum, it places the antenna firmly within the complete signal path: from biosensor to wireless link to clinical interface, examining how each design decision ripples through system performance.
The paper surveys the main antenna topologies suited for on-body use — microstrip patches, textile antennas, flexible substrate designs, embedded watch antennas, and the newer graphene-printed and 5G millimetre-wave arrays — evaluating each against a consistent set of criteria: on-body radiation efficiency, specific absorption rate (SAR), mechanical durability over a realistic garment lifetime, fabrication complexity, and suitability for actual clinical environments. Wireless Body Area Network (WBAN) standards, especially IEEE 802.15.6, are examined alongside practical frequency band selection, system link budgets, and the electronics integration constraints that determine whether a working antenna prototype ever becomes a deployable medical device.
The literature review has been substantially expanded to include recent advances from 2021 to 2026, covering graphene-based flexible antennas, 5G mmWave MIMO arrays, AI-assisted antenna optimisation, biodegradable substrate designs, and hybrid implantable-to-wearable relay links. Specific clinical applications — ambulatory ECG, fall detection in the elderly, post-operative remote monitoring, and rehabilitation — are discussed in terms of what each application actually demands from the antenna, not just the RF performance numbers it produces.
The paper concludes by identifying the research gaps that genuinely matter: the body variability problem that Cotton and Scanlon flagged in 2009 and which remains unsolved; the near-complete absence of long-term fabric reliability data; the ISM band congestion that no antenna design can fix on its own; and the substantial gap between RF prototypes and clinically validated, regulatory-cleared devices. Directions for future work are grounded in these actual gaps rather than speculative extrapolation.

Wearable Antennas, WBAN, IEEE 802.15.6, BLE, Body Area Network, SAR, Textile Antennas, Health Monitoring, IoMT, ECG, Remote Patient Monitoring, 5G mmWave, Graphene Antenna, AI Antenna Design

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