A Wideband Substrate Integrated Waveguide Slot Antenna with Quad Modes

This paper presents a quad-mode slot antenna based on the substrate integrated waveguide (SIW) structure. A SIW antenna is designed at first, and two slots are etched on the patch, to radiate energy in the same phase. By analyzing the electric field distributions of the selected mode, several pairs of shorting vias are arranged inside the SIW cavity. Consequently, the lower modes (TE
₃₁₀
mode and TE
₁₂₀
mode) are moved upward and merged with the TE
₃₂₀
mode and a high-order mode. Hence, a wideband SIW slot antenna with quad modes is achieved. The proposed antenna shows an impedance bandwidth of 16.4% and a peak gain of 9 dBi from the simulated results.