Low-Profile, Wideband, and Decoupled Dual-Polarized Antenna Array Loaded with T-SRR, CNL, and DGS

A dual-polarized antenna array loaded with hybrid decoupling structures is proposed in this article. This special hybrid decoupling method combines interception and neutralization to simultaneously suppress co-and cross-polarized mutual couplings over a wide band. A novel tree-structured split-ring resonator (T-SRR) is proposed and analyzed. The loaded T-SRR baffles realize wideband coupling wave intercepting. In the meantime, it significantly reduces the profile of array. Later, as a complement of interception decoupling, coupled neutralization line (CNL) and defected ground structure (DGS) are introduced to generate an extra neutralizing coupling path. After the hybrid structures are loaded, the proposed array operates within 1.7–2.6 GHz (42%), and the maximum in-band mutual coupling level is reduced from -12.5 dB to -20 dB. Furthermore, the profile of the proposed array decreases from 0.25k0 to 0.1k0, exhibiting a 60% reduction. These merits make it suitable for miniaturized wireless communication systems. Compared with other dual-polarized antenna array decoupling methods, the proposed technique drastically reduces the overall profile while maintaining wide bandwidth. The radiation pattern decoupling and optimization effects of the hybrid decoupling method are also considerable.