A Novel Beam-Steerable Antenna Using HIS-SWG Reconfigurable Artificial Ground Structure

摘要

An artificial ground structure (AGS) which can be switched between the high-impedance surface (HIS), the surface-waveguide (SWG) and the HIS-SWG hybrid structure is proposed for the design of a beam-steerable antenna. The AGS is reconfigured with PIN diodes inserted on the bottom ground. The antenna radiates a broadside far-field pattern when the AGS is reconfigured into an HIS, and it steers its main beam to the endfire direction when the AGS exhibits as an HIS-SWG hybrid structure. The reconfigured HIS and SWG are analyzed using the Brillouin dispersion theory and the eigenvalue analysis, respectively. A prototype of the proposed beam-steerable antenna is fabricated and measured. The measured results including the reflection coefficients and radiation patterns validate the antenna performance.