Scattering of linearly polarized microwave radiation from a dielectric target including the interaction between target elements.

Abstract

The theory for finding the internal field within a dielectric helix when the radiation has a wavelength larger than the diameter of the helical wire is presented. Intensities are calculated and compared to an experiment and to the theoretical results of an earlier paper that does not include the self-interaction effect. The internal field is defined in terms of a polarization matrix that is assumed to be constant across any cross section of the helix. It is found that target self-iteractions have a significant effect on the internal field. It is also noted that this effect for the far field intensities, although significant and generally a better fit to the data, is not profoundly different. That is, the effects of a more appropriately constructed internal field are less important than the geometry effect in the far field.

AI evidence extraction

Main findings

A theory is presented to calculate the internal field within a dielectric helix for incident linearly polarized microwave radiation when the wavelength is larger than the helix wire diameter. Including target self-interactions significantly affects the internal field, and yields far-field intensity predictions that are generally a better fit to experimental data, though geometry effects dominate far-field behavior.

Outcomes measured

• internal field within a dielectric helix
• far-field scattering intensities

{
    "study_type": "engineering",
    "exposure": {
        "band": "microwave",
        "source": null,
        "frequency_mhz": null,
        "sar_wkg": null,
        "duration": null
    },
    "population": null,
    "sample_size": null,
    "outcomes": [
        "internal field within a dielectric helix",
        "far-field scattering intensities"
    ],
    "main_findings": "A theory is presented to calculate the internal field within a dielectric helix for incident linearly polarized microwave radiation when the wavelength is larger than the helix wire diameter. Including target self-interactions significantly affects the internal field, and yields far-field intensity predictions that are generally a better fit to experimental data, though geometry effects dominate far-field behavior.",
    "effect_direction": "unclear",
    "limitations": [],
    "evidence_strength": "insufficient",
    "confidence": 0.7399999999999999911182158029987476766109466552734375,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "microwave radiation",
        "scattering",
        "dielectric target",
        "dielectric helix",
        "linear polarization",
        "internal field",
        "self-interaction",
        "far field",
        "intensity",
        "polarization matrix"
    ],
    "suggested_hubs": []
}

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