Complementary Metasurfaces for Guiding Electromagnetic Wave

Abstract

Waveguides are critically important components in microwave, THz, and optical technologies. Due to recent progress in two-dimensional materials, metasurfaces can be efficiently used to design novel waveguide structures which confine the electromagnetic energy while the structure is open. Here, we introduce a special type of such structures formed by two penetrable metasurfaces which have complementary isotropic surface impedances. We theoretically study guided modes supported by the proposed structure and discuss the corresponding dispersion properties. Furthermore, we show the results for different scenarios in which the surface impedances possess non-resonant or resonant characteristics, and the distance between the metasurfaces changes from large values to the extreme limit of zero. As an implication of this work, we demonstrate that there is a possibility to excite two modes with orthogonal polarizations having the same phase velocity within a broad frequency range. This property is promising for applications in leaky-wave antennas and field focusing.

Time-Code-Spatial Modulated IRS-Aided Radar Localization in NLoS Scenario

“…Intelligent Reflecting Surfaces (IRS) have been used in communication systems for signal-to-noise (SNR) ratio enhancement [1], capacity increase [2], and radio-based localization [3] by controlling the radio waves in frequency, amplitude, phase, polarization, and propagation direction [4], [5], [6]. Recently, IRS is being considered for assisting the radar systems in non-line-of-sight (NLoS) scenarios [7], and the merits of signal enhancement in IRS-aided multiple inputs multiple outputs (MIMO) radar systems have already been analyzed [8].…”