A dual-band antenna array with electromagnetic transparent feeding network for mobile communications

This is the authors' abstract. We don't add key points for this paper.

In this paper, a compact dual-band shared-aperture dual-polarized antenna array with electromagnetic transparent feeding networks is proposed for mobile communications. The proposed antenna array is composed of a 2 × 5 array antenna operating in the low-band (LB: 1.7–2.7 GHz), and a 3 × 8 array antenna operating in the high-band (HB: 3.3–3.8 GHz, i.e. N78 band). The electromagnetic transparent feeding network is realized by introducing interlaced narrow cavities over a frequency selective surface (FSS), and the feeding networks lie inside the interlaced narrow cavities to excite the antenna arrays. In addition, the FSS offers low-pass property in the LB and high-pass property in the HB. Therefore, the FSS efficiently suppresses the cross-band coupling between the LB and HB antenna arrays. A prototype of the dual-band antenna array with the proposed electromagnetic transparent feeding network is fabricated. Experimental results show both the LB and HB antennas exhibit stable radiation patterns, and satisfactory antenna realized gains, half-power beamwidth, and cross-polarization discriminations. Moreover, the antenna array achieves high cross-band isolation (20 ~ 35 dB) and realizes ±45° and ±60° beam scanning in the LB and HB. The proposed antenna array is expected to be used for the fifth-generation base station in the mobile environment.