High‐Isolation Low‐Profile ME Dipole Antenna Design With Wideband Hybrid Decoupling Techniques

This letter proposes a low‐profile magneto‐electric (ME) dipole antenna for in‐band full‐duplex (IBFD) systems. The designed antenna consists of a crossed ME dipole with cross‐shaped copper pillars serving as magnetic arms. One polarization is fed via an H‐shaped slot coupled by a T‐shaped power divider at one port. The other port adopts a differential feeding setup, utilizing an external 180° power divider. By integrating hybrid decoupling techniques, the prototype achieves a port‐to‐port isolation exceeding 45 dB within an overlapping −10 dB impedance bandwidth of 46.8% (1.70–2.73 GHz). By enlarging the dipole dimensions and optimizing current distribution through the cross‐shaped copper pillar structure, the profile height is reduced from 0.25 λ₀ in conventional designs to 0.13 λ₀. Measurement results show that Port 1 exhibits a gain range of 7.2–9.5 dBi, while Port 2 achieves 6.3–7.7 dBi. Additionally, the measured radiation efficiency exceeds 70% across the 1.70–2.73 GHz band. These characteristics make the antenna a promising candidate for IBFD base station systems.