Design of Triple-Resonance Substrate Integrated Waveguide Cavity-Backed Slot Antenna with Double Cavities

In this paper, a triple-resonance substrate integrated waveguide (SIW) cavity-backed slot antenna (CBSA) with double cavities is proposed. The antenna is divided into double cavities by loading a symmetrical row of shorting vias. The double cavities and non-resonant slot help to influence current distributions that excite a lower mode (half-TE110) and two higher modes (odd and even TE210). Reflection coefficients of the three frequency points are affected by the dimensions of the cavities and the slot. A prototype is measured which exhibits a peak gain of 6.3 dB and a triple-resonance at 6.72 GHz, 9.03 GHz and 10.31 GHz, respectively.