Dual-Polarized Filtering Antenna Array for 5G Base Station Applications

In this paper, a dual-polarized antenna array with filtering characteristic is designed with simple structure for sub-6GHz frequency band. The antenna array consists of six filtering antenna elements where each element includes a radiation patch, a feeding patch and a reflector. On the feeding patch of each element, an octagonal slot is cut for adjusting the impedance and enhancing impedance matching. A 1 to 6 micro -strip power divider is designed to excite the antenna array. As shown in the measured results, this 5G array exhibits the reflection coefficient vertical bar S-11 vertical bar of smaller tan -10 dB, the gain of more than 13.2 dBi, the first sidelobe suppression above 15 dB and out of band gain suppression of 243 dBi over the frequency band.