Design and Experimental Demonstration of an X-Band Hemispherically-Shaped Conformal Frequency Selective Surface

Le résumé fourni par la source

A technique to design hemispherically shaped conformal frequency selective surfaces (FSS) is presented. The technique utilizes a Goldberg polyhedron discretization resulting in hexagonal unit cells. The hexagonal unit cells are populated with a multilayered stack of three metallic claddings separated by dielectric spacers. The arrangement forms a passband covering the X-band. A geometrical scaling technique is used to compensate for varying unit cell dimensions associated with the Goldberg polyhedron. Full-wave simulations of the conformal FSS show excellent agreement with the theoretical performance predicted by unit cell simulations. The FSS was fabricated using a 5-axis additive manufacturing technique using ABS plastic and conductive silver paste. Measured results show good agreement throughout the passband. A special postprocessing technique was developed to synthesize an effective Gaussian beam illumination from far field data. The technique provides improved agreement in the stopband where edge diffraction can be significant in the ideally zero field region.

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