Theoretical Analysis on Reflection Properties of Reflectarray Unit Cells Using Quality Factors

    Authors

    K. K. Karnati; Y. Yusuf; S. Ebadi;X. Gong

    Comments

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    Abbreviated Journal Title

    IEEE Trans. Antennas Propag.

    Keywords

    Cavity resonators; coupled mode analysis; microstrip antennas; quality; (Q) factor; rectangular waveguides; reflectarray; MICROSTRIP REFLECTARRAY; VARIABLE SIZE; ELEMENT; DESIGN; PATCHES; ANTENNA; Engineering, Electrical & Electronic; Telecommunications

    Abstract

    In this paper, a novel theoretical approach to extract the reflection coefficient of reflectarray unit cells is developed. The approach is applied to single-resonance unit cell elements under metallic-waveguide incidence. Using this theory, effects of different physical parameters on reflection properties of unit cells can be thoroughly studied without the need of full-wave simulations. It is shown that the reflectarray unit cell falls into three coupling regions depending on its physical dimensions and substrate properties, which lead to either well-behaved or inadequate reflection phase. Detailed analysis is performed for Ka-band reflectarray unit cells and verified by full-wave simulations. Reflectarray unit cells with different substrate thicknesses, patch widths, and dielectric constants are fabricated and measured. The measurement data closely matches both the theory and full-wave simulations. The presented theory provides valuable physical insight and guidelines for optimization of reflectarray unit cells.

    Journal Title

    Ieee Transactions on Antennas and Propagation

    Volume

    61

    Issue/Number

    1

    Publication Date

    1-1-2013

    Document Type

    Article

    Language

    English

    First Page

    201

    Last Page

    210

    WOS Identifier

    WOS:000312996000024

    ISSN

    0018-926X

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