Development of A Multi-Band Shared-Aperture Antenna Array

In multi-band shared-aperture antennas for base station, the cross-band couplings have severe influences on the performance of higher-band antennas. In this work, those influences are attributed to the secondary radiation field problem. For solving this problem, an L-band (0.76 - 0.88 GHz) antenna with electromagnetic-transparent characteristics is designed. This L-band antenna has M-band (1.9 - 2.7 GHz) and H-band (3.3 - 3.9 GHz) electromagnetic-transparent characteristics. Furthermore, an L/M dual-band array and an L/H dual-band array are designed for proving electromagnetic-transparent characteristics. The simulated results validate the applicability of this proposed antenna for massive MIMO base station antenna developments.