A slotted metagratings leaky-wave antenna with theoretical analysis

In this contribution, a new slotted metagratings based leaky-wave antenna (MGs LWA) featuring a wide beam-scanning is presented to overcome the limitation of the mutual coupling and the open-stopband effects in traditional LWA. The MGs LWA is comprised of a parallel-plate waveguide with a periodic MGs array etched on the top plate over a dielectric substrate with PEC-backed. An analytical theory is created as a conceptual model for the corresponding equivalent electromagnetic fields produced by slotted MGs, that generate the Z-matrix and S-matrix for a two-port structure from the electric and magnetic fields. Furthermore, an approximate analysis is derived using Green’s function to quantify mutual admittance coupling. This antenna has excellent success due to its ability to achieve a wide beam-scanning range with a high realized gain while still having a narrow beam width in the E-plane. With the utilizing results, the bandwidth range of 64% with continuous beam-scanned of 74° and narrow angular beamwidth up to 11.1° in the E-plane is obtained. Meanwhile, the beam-scanned sensitivity is 5.4°/GHz. The realized gain is up to 16.3 dBi. Finally, the MGs LWA is fabricated to approve the theoretical and simulation results. Thus, a low permittivity and thin substrate are selected to enable perfect beam-scanning for 5 G high-speed mobile communication systems.