Q Factor Analysis of Reflectarray Elements Investigating the Effects From Angle of Incidence Using Floquet Modes

    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; Floquet expansions; microstrip; antennas; microstrip arrays; quality (Q) factor; reflectarray; waveguides; VARIABLE SIZE; ARRAY ANTENNA; PATCHES; DESIGN; Engineering, Electrical & Electronic; Telecommunications

    Abstract

    A theoretical approach to investigate the effects of incidence angle on reflection properties of reflectarray elements is developed for the first time. Utilizing coupled-mode theory and Floquet analysis, the dependence of reflection coefficient on incidence angles and plane of incidence is presented in terms of Q factors. A unit cell excited by a plane wave at different incidence angles is shown to have varying coupling conditions and reflection properties. Emphasis is laid on elements located on planes where extremities in performance tend to occur. Anomalous phase characteristics are observed for particular polarization and incidence angles. The antenna element properties are assessed in terms of maximum reflection loss and slope of the reflection phase. A thorough analysis is performed at K-a band and the results obtained are verified using full-wave simulations. Reflection coefficients over a 749-element reflectarray aperture for a broadside radiation pattern are presented for a couple of cases and the effects of coupling conditions in conjunction with incidence angles are demonstrated. The presented theory provides explicit physical intuition and guidelines for efficient and accurate reflectarray design.

    Journal Title

    Ieee Transactions on Antennas and Propagation

    Volume

    62

    Issue/Number

    10

    Publication Date

    1-1-2014

    Document Type

    Article

    Language

    English

    First Page

    5017

    Last Page

    5028

    WOS Identifier

    WOS:000343608600011

    ISSN

    0018-926X

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