Using optimized eccentricity rexolite lens for electrical beam steering with inte-grated aperture coupled patch array

A. Karttunen (Corresponding Author), Jussi Säily, Antti Lamminen, J. Ala-Laurinaho, R. Sauleau, A.V. Räisänen

    Research output: Contribution to journalArticleScientificpeer-review

    18 Citations (Scopus)


    Design and measurement results of a beam-steering integrated lens antenna at 77 GHz are presented. An 8-element LTCC aperture coupled patch antenna feed array with a switching network is used to electrically steer the main beam in H-plane. A 100-mm diameter Rexolite (εr = 2.53) lens is simulated and tested. The eccentricity of the lens is optimized in an earlier work with ray-tracing simulations for improved beam-steering properties compared to the conventional extended hemispherical and elliptical lenses. The beamsteering properties including scan loss, main-beam width and direction, side-lobe levels, directivity, and cross-polarization are analyzed in detail with both simulations and radiation pattern measurements. As expected, the results show that the side-lobe and cross-polarization levels are not predicted accurately with large feed offsets using the ray-tracing simulations. Nevertheless, it is shown that the lens shape can be successfully optimized with the simple and fast ray-tracing simulations. The measured half-power beam-width at 77 GHz is 2.5°±0.2° up to the largest tested beam-steering angle of 30°. The optimized eccentricity low permittivity lens results in smaller scan loss than the conventional lenses.
    Original languageEnglish
    Pages (from-to)345-365
    Number of pages20
    JournalProgress In Electromagnetics Research B
    Publication statusPublished - 2012
    MoE publication typeA1 Journal article-refereed


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