Broadband High Directivity Multi-Beam Emission Through Transformation Optics Enabled Metamaterial Lenses

Zhihao, Jiang and Micah , D. Gregory and Douglas, H. Werner (2012) Broadband High Directivity Multi-Beam Emission Through Transformation Optics Enabled Metamaterial Lenses. Trento : Università degli Studi.

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    A new broadband two- and three-dimensional, polarization independent embedded coordinate transformation is introduced that is capable of mapping the radiation from an embedded omnidirectional source into any desired number of highly directive beams pointed in arbitrary directions. This transformation requires anisotropic materials, yet is spatially invariant and thereby can be readily implemented by currently existing metamaterial technologies. Moreover, the performance of the transformation is not sensitive to small material parameter variations, thus enabling a broad operational bandwidth. To validate the concept, a broadband 3D coordinate transformation metamaterial lens fed by a simple monopole antenna was designed, fabricated and characterized, achieving a quad-beam radiation pattern over a 1.26:1 bandwidth with approximately 6 dB realized gain improvement in the H-plane. In addition, the near-field coupling between the monopole and the lens was carefully tuned to accomplish a remarkable 70% broadening of the impedance bandwidth compared to the monopole antenna operating alone. It is also shown from the field simulations that the realized metamaterial lens provides both near-field and far-field 3D collimating effects.

    Item Type: Departmental Technical Report
    Publisher policy set phrase: "(c) 2012 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works".
    Department or Research center: Information Engineering and Computer Science
    Subjects: Q Science > QC Physics (General) > QC760 Electromagnetism
    T Technology > TA Engineering (General). Civil engineering (General) > TA174 Engineering Design
    T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7885 Computer Engineering
    Report Number: DISI-12-030
    Repository staff approval on: 15 Oct 2012 15:36

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