This letter proposes a technique to enhance the performance of a square-ring antenna by exciting surface waves. An asymmetrical metasurface (MS) is utilized to control the surface-wave resonances at different planes. To excite the surface waves, various configurations have been considered, namely, square-ring element above, below, and within the MS. The latter design, with a 0.07 λo height profile, provides superior matching and gain performances compared to the others. It operates from 3.8 to 5 GHz (27% fractional bandwidth) with a stable realized gain up to 11.9 dBi in the broadside direction. A prototype of the structure, with a simple probe-feeding mechanism, was fabricated and measured. An excellent agreement was attained between the simulated and measured data.
- Low profile
- Metasurface (MS) ground plane
- Square-ring antennas
- Surface-wave antenna
ASJC Scopus subject areas
- Electrical and Electronic Engineering