A Low-Profile Tightly Coupled Dipole Linear Array With High Cross-Polarization Discrimination (XPD)

This letter proposed a dual-polarized tightly coupled dipole linear array (TCDLA) with high cross polarization discrimination (XPD). Building upon conventional TCDLA architectures, this work develops enhanced configurations through capacitive coupling structures and matching material loading to broaden operational bandwidth. A dual-layer ground structure is implemented to achieve lower profile characteristics. For the first time, an interleaved array configuration is proposed to address the inherent poor XPD caused by asymmetric array distribution in conventional TCDLA. At last, 5.7:1 bandwidth ratio (0.35-2GHz) with 60° maximum scan angle is obtained by the proposed antenna, and its XPD exceeding 20 dB across the entire operating band.