A wideband antenna fed by substrate integrated waveguide (SIW) is presented, after introducing two pairs of metallic vias inside the SIW and placing two rectangular resonators beside the conventional patch antenna, three resonated modes can be achieved. By moving these two higher frequency modes close to the resonated mode of the patch antenna, bandwidth is broadened. Base on the triple-mode antenna element, we develop a antenna array which consists of 4 elements and a SIW feeding network. The 2x2 array can be designed and fabricated with single-layer printed-circuit board (PCB). The measured -10dB impedance bandwidth of the antenna array is 18.2% (40.9-49.1GHz) with peak gain of 10.4-14.0dBi and the cross-polarization level of better than 20 dB.
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