Dr. Ilker Gunay Profile

Dr. Ilker Gunay

at ASELSAN AS

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Proceedings Article | 4 October 2023 Presentation + Paper

Design and verification of periodic metallic mesh structures for optical windows

İlker Günay, Tolga Yelboğa, Asım Egemen Yılmaz

Proceedings Volume 12646, 1264607 (2023) https://doi.org/10.1117/12.2676354

KEYWORDS: Diffraction, Design and modelling, Electrical conductivity, Windows, Electromagnetism, Dielectrics, Sapphire, Optical transmission, Electromagnetic interference

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RADAR Cross Section (RCS) is an essential factor in modern defense applications for detection and identification of platforms. Careful management of RCS requirements is crucial from initial design phase to integration stage. Electrooptical sensors create discontinuities on the frame of the platform which can negatively impact the low RCS requirement. To ensure the low RCS requirement, discontinuities, either as protrusion or opening, shall be electrically conductive and optically transparent. The use of metasurfaces, designed with a periodic mesh structure, is a widely adopted approach meeting these requirements. Electromagnetic and optical performance of periodic mesh structure depend on parameters such as shape of elements, dimensions of elements, interelement spacing, substrate material parameters etc. This paper starts with the analysis of electromagnetic shielding effectiveness of periodic mesh structure via equivalent circuit method (ECM) and Floquet Port Modes. ANSYS HFSS and CST MWS software are used for the analysis of Floquet Port Modes. Analysis results are compared with measurements via coaxial holder method stated in ASTM D 4935 standard. Samples used in coaxial holder is produced with photolithography. Aligned dual antennae method referred in IEEE 299 is used as verification technique. Additionally, diffraction effects from the mesh structure are analyzed and measured in the visible and mid-wave range.

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