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

─ 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 beamsteerable 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 HISSWG 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. Index Terms ─ Artificial ground structure (AGS), beamsteerable antenna, eigenvalue analysis, high-impedance surface (HIS), surface-wave guide (SWG).

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