Double-Layer Frequency Selective Surface-Based Corner Reflector for Indoor Self-Localization Systems in the W-band

One possibility to enable low complexity and robust indoor self-localization systems operating at the W-band (75 GHz to 110 GHz) is the deployment of chipless infrastructure. To do so, frequency-coded radar targets are placed in designated coordinates, where a stopband structure is placed into the aperture of a metallic corner reflector (CR). In this work, an alternative is presented by designing a passband double-layer frequency selective surface (FSS) and assembling it in the shape of a CR. The FSS is formed by a Jerusalem cross on one side and a square ring on the other side. The measured resonance frequency, f <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">res</inf> , differs for both transverse electric (92 GHz) and transverse magnetic (79 GHz) plane waves, which is attributed to manufacturing tolerances. Regardless, the f <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">res</inf> shifts less than 3.5 % up to 45° for both polarizations. The resulting CR assembly presents a notch as frequency-coded response between 80 GHz to 90 GHz.