Low-SAR Antenna Design and Implementation for Mobile Phone Applications

2021 · Benefit · Low evidence

← Research stream

BenefitLow evidencePaper 1113

Study snapshot

Publicationmanual · 2021

Study typeengineering

Reported directionBenefit

Evidence ratingLow

Abstract

Low-SAR Antenna Design and Implementation for Mobile Phone Applications Bao Lu, Bo Pang, Wei Hu, Wen Jiang. Low-SAR Antenna Design and Implementation for Mobile Phone Applications. IEEE Access. 30 June 2021. doi: 10.1109/ACCESS.2021.3093720. Abstract This paper presents a novel approach for designing low-SAR (specific absorption rate) terminal antenna. First of all, the relationship between the magnetic field and the SAR value is deduced by using the electric field formula of SAR and Maxwell’s equations. Then, by using the boundary conditions of the medium, the interaction mechanism between the radiated magnetic field of the antenna and the magnetic field inside human tissue is studied. Next, the relationship between the surface current and the radiated magnetic field of antenna is constructed. The approach of reducing the antenna radiated magnetic field is proposed by directly adjusting the antenna surface current, so that the SAR of human tissues is reduced. Finally, two low-SAR antennas are designed according to the proposed approach. The simulation and measurement results of the two low-SAR antennas show that the -6 dB bandwidth of both antennas is 2.4-2.49 GHz, which can meet the 2.4 G WLAN frequency band. At the same time, compared with the reference antenna, the peak values of 10 g average SAR of two antennas are reduced by more than 30%. In addition, the measured efficiencies of the two low-SAR antennas are higher than 40% in the operating frequency range. The validity of the proposed approach is proved by the simulation and measurement results of the antenna, which can be used to guide the SAR reduction design of mobile terminal antennas. Open access paper: ieeexplore.ieee.org

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 directionbenefit

PopulationNot supplied

Sample sizeNot supplied

ExposureRF · 2445 MHz

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

The authors propose a low-SAR terminal antenna design approach based on adjusting antenna surface current to reduce the radiated magnetic field. For two designed antennas operating at 2.4–2.49 GHz, simulations and measurements indicate the peak 10 g average SAR is reduced by more than 30% compared with a reference antenna, with measured efficiencies above 40% in the operating band.

Outcomes measured

10 g average SAR (peak)
-6 dB bandwidth (2.4–2.49 GHz)
antenna efficiency

Limitations

No human participant population described (engineering/simulation and measurement study).
SAR values are reported as relative reductions; absolute SAR levels are not provided in the abstract.
Details of measurement setup, tissue model, and reference antenna are not provided in the abstract.

View raw extracted JSON

{
  "study_type": "engineering",
  "exposure": {
    "band": "RF",
    "source": "mobile phone",
    "frequency_mhz": 2445,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "10 g average SAR (peak)",
    "-6 dB bandwidth (2.4–2.49 GHz)",
    "antenna efficiency"
  ],
  "main_findings": "The authors propose a low-SAR terminal antenna design approach based on adjusting antenna surface current to reduce the radiated magnetic field. For two designed antennas operating at 2.4–2.49 GHz, simulations and measurements indicate the peak 10 g average SAR is reduced by more than 30% compared with a reference antenna, with measured efficiencies above 40% in the operating band.",
  "effect_direction": "benefit",
  "limitations": [
    "No human participant population described (engineering/simulation and measurement study).",
    "SAR values are reported as relative reductions; absolute SAR levels are not provided in the abstract.",
    "Details of measurement setup, tissue model, and reference antenna are not provided in the abstract."
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "low-SAR",
    "specific absorption rate",
    "terminal antenna",
    "mobile phone",
    "surface current",
    "magnetic field",
    "2.4 GHz",
    "WLAN",
    "10 g average SAR",
    "antenna efficiency"
  ],
  "suggested_hubs": []
}

AI can be wrong. Always verify against the paper.

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: 10.1109/access.2021.3093720
PubMed: Not supplied

Read the original paper →

Related papers

← Back to the Research Library