Broadband Dual-Polarized Element With Rotated Sleeve Arms for Compact Dual-Band Antenna

A dual-polarized lower band (LB) antenna element is proposed in this letter. A pair of vertical arms and a pair of horizontal arms are designed with two cross Γ-shaped feeding lines together for ±45° polarizations. The sleeve arm can suppress the scattering for high-frequency electromagnetic wave and have almost negligible effect on low frequency. Meanwhile, unobstructed space for placing the higher band (HB) elements is reserved with surrounded scheme. The dual-band antenna (DBA) with four HB elements operating from 1.46–2.43 GHz and one LB element operating from 0.65–1.11 GHz is designed and fabricated. The simulated and measured results show that the stable radiation performance and low mutual interference for LB and HB elements are achieved in DBA.