A Compact Button Antenna with Dual-Band and Dual-Polarization for Wearable Body Area Networks.

Micromachines · 2025 · No effect · Insufficient evidence

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No effectInsufficient evidencePaper 2406

A compact button antenna for WBANs is reported to operate in the 2.45 GHz and 5.8 GHz ISM bands, with measured free-space and on-body tests supporting dual-band and dual-polarization performance. SAR simulations on a human model were reported as significantly…

Study snapshot

PublicationMicromachines · 2025

Study typeengineering

Reported directionNo effect

Evidence ratingInsufficient

Abstract

This paper presents a compact, dual-band, dual-polarization button antenna for Wireless Body Area Networks (WBANs) that operates in the 2.45 GHz and 5.8 GHz Industrial, Scientific, and Medical (ISM) bands. The antenna is engineered in the lower band from 2.33 to 2.8 GHz (18.3% fractional bandwidth) as a linearly polarized, top-loaded monopole, which provides an omnidirectional radiation pattern for on-body communication. In contrast, it functions as a cross-dipole in the higher band, achieving a fractional bandwidth of 66.4% (4.8-9.57 GHz) and a 3 dB axial ratio (AR) bandwidth of 57.4%, producing a broadside radiation with circular polarization for off-body communications. Prototype measurements in both free-space and on-body settings confirm the antenna's robust performance, successfully validating its dual-band operation, dual-polarization characteristics. Furthermore, Specific Absorption Rate (SAR) simulations conducted on a human model demonstrate that the values are significantly below the established safety limits, confirming the antenna's suitability for practical wearable applications.

Machine Enhanced Logic

AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeengineering

Effect directionno_effect

PopulationNot supplied

Sample sizeNot supplied

ExposureRF

Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

Outcomes measured

Antenna performance (dual-band operation, bandwidth, polarization, radiation patterns) in free-space and on-body settings
Specific Absorption Rate (SAR) simulation results on a human model relative to safety limits

Limitations

No numeric SAR values are provided in the abstract.
SAR results are described as simulations on a human model; details of model, assumptions, and standards/limits are not specified in the abstract.
No sample size or participant details are provided for the on-body measurements.

View raw extracted JSON

{
  "study_type": "engineering",
  "exposure": {
    "band": "RF",
    "source": "wearable (WBAN) antenna",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Antenna performance (dual-band operation, bandwidth, polarization, radiation patterns) in free-space and on-body settings",
    "Specific Absorption Rate (SAR) simulation results on a human model relative to safety limits"
  ],
  "main_findings": "A compact button antenna for WBANs is reported to operate in the 2.45 GHz and 5.8 GHz ISM bands, with measured free-space and on-body tests supporting dual-band and dual-polarization performance. SAR simulations on a human model were reported as significantly below established safety limits.",
  "effect_direction": "no_effect",
  "limitations": [
    "No numeric SAR values are provided in the abstract.",
    "SAR results are described as simulations on a human model; details of model, assumptions, and standards/limits are not specified in the abstract.",
    "No sample size or participant details are provided for the on-body measurements."
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "wearable",
    "WBAN",
    "button antenna",
    "2.45 GHz",
    "5.8 GHz",
    "ISM band",
    "dual-band",
    "dual-polarization",
    "circular polarization",
    "on-body",
    "SAR"
  ],
  "suggested_hubs": [
    {
      "slug": "occupational-exposure",
      "weight": 0.1,
      "reason": "Wearable/on-body RF device context, but not an occupational study."
    }
  ]
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.3390/mi17010028
PubMed: 41597809

Read the original paper →

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