Wideband Millimeter-Wave Substrate-Integrated Waveguide-Fed Metasurface Antenna

A wideband metasurface antenna operating at millimeter-wave spectrum in substrate-integrated waveguide (SIW) technology is proposed. Coupled by a slot etched on an SIW section, the proposed metasurface antenna achieves a wide 10 dB impedance bandwidth in simulation from 19.2 to 42.4 GHz, indicating a fractional bandwidth of 75%. The development of the proposed metasurface antenna can be divided into four stages, i.e., a slot antenna, dielectric loading, adding covered metasurface, and connecting to a transition. The input impedance and the resonance of these stages are elaborated in detail to explain the working mechanism. Parametric study is carried out to inspect into the design process. By analyzing the
$E$
-field distributions, the proposed metasurface antenna is characterized by TM
₁₀
mode, antiphase TM
₂₀
mode, and TM
₃₀
mode. Compared with other similar designs in the open literatures, the proposed metasurface antenna displays a widest impedance bandwidth. The dimension of the proposed metasurface antenna is
$0.80\,\,\lambda _{0} \times 0.72\,\,\lambda _{0} \times 0.24\,\,\lambda _{0}$
, where
$\lambda _{0}$
is the free-space wavelength at 30 GHz. The maximum gain within the interested frequency spectrum is 7.0 dBi.