To realize wideband high‐gain dual‐polarized radiation, the proposed antenna array consists of two microstrip feeding networks and two groups, altogether 13 metal radiation patches. One group, namely four of the patches, are two‐layer stacked octagonal patches excited by feeding networks directly, and the other group of nine patches, are parasitic rectangular patches for improving both impedance bandwidth and gain level. The height of the antenna array is 7 mm (∼0.083λ 0@3.55 GHz). The measured impedance bandwidths for VSWR < 1.5 at both ports are 12.6% (3.35–3.8 GHz). The isolation between the two ports is greater than 20 dB over the whole operating band. The measured gain is 16.2 dBi and the cross‐polarization level is less than −15 dB. The proposed structure possesses the features of low cost, low profile, high gain, wide band, and so forth.
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Yang et al. (2015) studied this question.