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A couple of decades have passed since the advent of electromagnetic metamaterials. Although the research on artificial microwave materials dates back to the middle of the 20th century, the most prominent development in the electromagnetics of artificial media has happened in the new millennium. In the last two decades, the electromagnetics of one-, two-, and three-dimensional metamaterials acquired robust characterization, measurement, and design tools (e.g., [1,2,3,4,5,6,7,8]). Novel fabrication techniques have been developed. Many exotic effects involving metamaterials and metasurfaces, which initially belonged in a scientist’s lab, are now well understood by practicing engineers. Therefore, when accepting the Guest Editor role for this Special Issue, I decided that it was the right moment to bring up and refresh the metamaterial concepts, which had to become a designer’s tools of choice in the present-day electronics, microwaves, and photonics.

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Category: Science