Waves in frequency-independent single-mode 2-D artificial media with forced refraction

Abstract

Investigations of the waves in planar structures with anisotropic gratings proved that structures of this type demonstrated properties of 2D media with forced refraction. Parasitic modes and limited frequency range were typical for them. This study investigated the propagation of guided waves along metal grating lying between two metal screens inside parallel plate waveguide (PPW). Dominant T-mode was the focus of this study. This mode was studied theoretically by the method of integral equations (IE) and numerically with the help of an electromagnetic Ansys HFSS simulation. Both methods demonstrated that the investigated structure had the properties of a 2D medium with forced refraction independent of frequency. The modified structure contained metal grating and an additional 2D array of metal cylinders was also studied numerically. The numerical simulation demonstrated that an array of metal cylinders suppressed parasitic PPW mode and thus modified structure demonstrated properties of a single-mode frequency independent artificial media with forced refraction. The results have the potential for application in microwave and millimeter-wave planar quasi-optical lens antennas.