A compact uniform circular array antenna for circularly polarized higher-order OAM beam generation through modes superposition.

PAPER pubmed PloS one 2026 Engineering / measurement Effect: unclear Evidence: Insufficient

Read original paper → DOI: 10.1371/journal.pone.0337197 PMID: 41616022 Evidence Lab

Abstract

This paper presents the design and validation of a compact uniform circular array (UCA) antenna for the generation of a higher-order orbital angular momentum (OAM) beam. The array combines the fifth-order OAM generated by individual ring patch antenna elements with the first-order OAM mode of the array to radiate the resultant sixth-order OAM beam through mode superposition. A dual-feed configuration is employed to achieve a 90-degree phase difference using differential feed lengths. Sequential rotation of elements ensures circular polarization without the need for complex feeding networks. Characteristic Mode Analysis (CMA) confirms the excitation of TM61 degenerate modes from ring patch antenna responsible for the fifth-order OAM radiation. The antenna operates at 3.55 GHz and achieves significant mode purity with an axial ratio below 3 dB. The proposed design is a single-layer, low-profile antenna that is suitable for narrowband OAM-based wireless sensor and communication systems, enabling high-order mode generation with a reduced number of array elements.

AI evidence extraction

At a glance

Study type

Engineering / measurement

Effect direction

unclear

Population

—

Sample size

—

Exposure

RF · 3550 MHz

Evidence strength

Insufficient

Confidence: 74% · Peer-reviewed: yes

Main findings

A compact uniform circular array antenna design is presented and validated to generate a resultant sixth-order OAM beam via superposition of fifth-order OAM from ring patch elements and first-order OAM from the array. The antenna operates at 3.55 GHz, achieves an axial ratio below 3 dB, and CMA indicates excitation of TM61 degenerate modes associated with fifth-order OAM radiation.

Outcomes measured

Antenna design for higher-order OAM beam generation
Circular polarization performance (axial ratio < 3 dB)
Mode purity (significant mode purity reported)
Excitation of TM61 degenerate modes (CMA confirmation)
Operation at 3.55 GHz

View raw extracted JSON

{
    "study_type": "engineering",
    "exposure": {
        "band": "RF",
        "source": null,
        "frequency_mhz": 3550,
        "sar_wkg": null,
        "duration": null
    },
    "population": null,
    "sample_size": null,
    "outcomes": [
        "Antenna design for higher-order OAM beam generation",
        "Circular polarization performance (axial ratio < 3 dB)",
        "Mode purity (significant mode purity reported)",
        "Excitation of TM61 degenerate modes (CMA confirmation)",
        "Operation at 3.55 GHz"
    ],
    "main_findings": "A compact uniform circular array antenna design is presented and validated to generate a resultant sixth-order OAM beam via superposition of fifth-order OAM from ring patch elements and first-order OAM from the array. The antenna operates at 3.55 GHz, achieves an axial ratio below 3 dB, and CMA indicates excitation of TM61 degenerate modes associated with fifth-order OAM radiation.",
    "effect_direction": "unclear",
    "limitations": [],
    "evidence_strength": "insufficient",
    "confidence": 0.7399999999999999911182158029987476766109466552734375,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "uniform circular array",
        "UCA",
        "orbital angular momentum",
        "OAM",
        "circular polarization",
        "ring patch antenna",
        "Characteristic Mode Analysis",
        "CMA",
        "TM61",
        "3.55 GHz",
        "mode superposition",
        "axial ratio",
        "wireless sensor",
        "communication systems"
    ],
    "suggested_hubs": []
}

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

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