Dual-band Dual-Polarized Array Antenna Based on Filtering Elements

A dual-band dual-polarized array antenna based on filtering elements without using extra filtering circuit is proposed. The proposed array antenna consists of one low-band (LB) element with four filtering high-band (HB) elements around it. The two operating bands of the dual-band array antenna are respectively 1.7-2.7 GHz (LB) and 3.3-4.2 GHz (HB). Based on the filtering response of these elements, the isolation between LB and HB elements can be largely improved compared with normal antenna elements. The isolation between LB element and HB element is more than 25 dB. In addition, the radiation properties of the antenna elements operating in different bands are not distinctively affected by each other. These merits make the proposed dual-band array antenna suitable for massive multiband array applications.