Triband planar shared‐aperture antenna array with similar‐shaped radiation patterns

In this paper, a triband planar shared‐aperture antenna array is proposed. The proposed antenna array could obtain similar‐shaped radiation patterns at three operating frequency bands. The total structure includes two radiation patch layers, a ground layer and a feeding network layer. Metal vias are used to excite the stacked patches, leading to three resonant frequencies. To verify the proposed antenna array, a 4 × 4 prototype with the overall size of 6.4 × 5.3 × 0.7 cm3 is fabricated and measured. The measured |S11| < −10 dB bandwidths are 13.34–13.82, 17.95‐18.61, and 23.8–25.15 GHz, and measured realized gains are 10.8, 11, and 14.4 dB at 13.5, 18, and 24 GHz.