Broadband Surface-Wave Antenna With a Novel Nonuniform Tapered Metasurface

A broadband surface-wave antenna with a monopole-like radiation pattern is presented. The antenna provides a wide bandwidth by two techniques, including the utilization of a novel nonuniform tapered metasurface that has smaller inner rectangular patches for exciting two resonant modes of TM
₀₁
and TM
₀₂
simultaneously, and a reduction of ground-plane size for constructively increasing surface-wave fields. The measured results show that the proposed antenna achieves a wide bandwidth of 33.1% (4.56-6.37 GHz) for a low profile of about 0.06 λ
₀
and has an average gain of 6.34 dBi.