Superdirectional loop antenna

By integrating a central electric dipole element within a miniature loop antenna and optimizing impedance, the design enhances directivity and compactness, addressing the challenges of maintaining radiation efficiency during miniaturization.

FR3154871A1Active Publication Date: 2025-05-02COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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Patent Information

Application Number
FR2023011854
Authority / Receiving Office
FR · FR
Patent Type
Applications
Current Assignee / Owner
Filing Date
2023-10-31
Publication Date
2025-05-02
Estimated Expiration
2043-10-31

AI Technical Summary

Technical Problem

Existing miniature loop antennas face challenges in maintaining directivity outside their plane, especially during miniaturization, which affects their ability to achieve high compactness and directional radiation.

Method used

The design incorporates a central electric dipole element circumscribed within a main loop antenna, with specific impedance optimization and connection port configurations to enhance directivity and maintain orthogonal radiation.

Benefits of technology

This configuration allows for improved directivity and compactness, enabling the antenna to maintain high radiation efficiency even at low C/X values, facilitating its use in compact networks and reducing the antenna's size without compromising directivity.

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Abstract

The invention relates to an antenna (1), comprising a main radiating element (2) of the loop antenna type, a first connection port (3) and a second connection port (4) arranged on either side of the main radiating element (2), a central element (5) of the electric dipole type, circumscribed within the main radiating element (2), the central element (5) being composed of two branches (6, 7) arranged symmetrically with respect to an axis of symmetry (8) passing through the first connection port (3) and the second connection port (4), the central element (5) being fed at a third connection port (9) located on the axis of symmetry (8), the main radiating element (2) and the central element (5) being coplanar. Figure for the abstract: Fig. 3
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Citation Information

Patent Citations

  • Loop antenna including impedance tuning gap and associated methods

    EP2178166A1

  • RFID tag with enhanced readability

    US7298343B2