PIER Letters
Progress In Electromagnetics Research Letters
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By O. Abu Safia, M. Nedil, M. C. E. Yagoub, and W. Yusuf

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In this paper, an optically transparent (OT) compact 4×4 Butler matrix (BM) operating at 2.4 GHz for Wi-Fi applications is proposed. The device has structured grids refined in quadrilateral cell shapes. The dimensions of cells are chosen based on a simple formulawhich guarantees a minimum required transparency levelin conjunction with a limited rounds of optimizations. A theoretical optical transparency value of 76.2% has been obtained without affecting the excellent electrical performance of the BM. Moreover, complimentary square split ring resonators (CS-SRRs) are patterned in the ground plane of each transparent transmission line in the BM. This loading technique provides a relative size reduction of 16.6% compared to a conventional structure. Simulated and measured results of the proposed design agree well with conventional BM's results. The proposed technique and its related features can be expanded to other microwave devices.

O. Abu Safia, M. Nedil, M. C. E. Yagoub, and W. Yusuf, "Optically Transparent Compact 4×4 Butler Matrix for Wi-Fi Applications," Progress In Electromagnetics Research Letters, Vol. 58, 119-124, 2016.

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