Decoupling of a Wideband Dual-Polarized Large-Scale Antenna Array With Dielectric Stubs

Abstract

A technique of decoupling dielectric stubs (DDS) is proposed for mutual coupling reduction of wideband, dualpolarized, and large-scale antenna arrays in this paper, where a low dielectric constant DDS is mounting on a dual-polarized and wideband antenna array seamlessly. The decoupling mechanism of the proposed DDS is qualitatively explained. By properly optimizing the dielectric constant and dimensions of the dielectric stubs, the DDS can reduce the mutual couplings between array elements efficiently. The dielectric stubs are considered as perturbations to slightly localize the electromagnetic fields radiated from the antenna element to lower the space wave coupling. The advantages of the proposed decoupling technique are wideband, low cost, high efficiency, and suitable for large-scale antenna arrays. For demonstration, 4 × 4 dual-polarized and wideband antenna arrays with and without the DDS are simulated, measured, and compared. The simulated results show that the antenna array with the DDS can achieve all port-to-port isolations over 25 dB from 4.4 to 5.0 GHz for all the coupling paths, which are 7 dB higher than the counterparts without the DDS. Moreover, the total efficiencies of the antenna elements with the proposed DDS are also improved. The measured results agree well with the simulated, verifying the effectiveness of the proposed method of DDS for decoupling of large-scale antenna arrays.

Mutual Decoupling for Massive MIMO Antenna Arrays by Using Triple-Layer Meta-Surface

“…Therefore, it increases the design complexity of the ADS. The array with TMS in this work has a lower profile than the array proposed in [32]. In addition, a low dielectric constant of the DDS is needed because a higher dielectric constant negatively deteriorates the impedance match of the antenna element.…”

“…However, it is not available to be scaled up to dual-polarized arrays because it will increase the coupling in the orthogonal modes. Many decoupling methods for the massive MIMO arrays have been reported [27][28][29][30][31][32]. A non-resonant metasurface (NMS) with a was proposed in [27] to suppress the propagation of the space waves.…”

“…A new method of decoupling dielectric stubs (DDS) is proposed as perturbations to constrain the electromagnetic fields of the array element [32]. However, dielectric stubs with low permittivity are needed to reduce transmission loss.…”

Design and implementation of elliptical mantle cloaks for polarization decoupling of two tightly spaced interleaved co-frequency patch array antennas

“… References Characteristics Method of decoupling Edge to edge element Spacing Complexity of decoupling method Decoupling level (pol. isolation) (dB) Frequency (GHz) Antenna type 51 Modified array antenna decoupling surface Defected ground structures 0.034 λ 0 High with 3D structure and two-stage design 26 3.7 Patch 52 Ceramic superstrate-based decoupling method 0.28 λ 0 Medium with 3D structure 25 3.5 Dipole 53 Central-symmetry decoupling technique 0.11 λ 0 Low 22 2.5 Patch 54 Mixed radiation modes 0.11 λ 0 Medium with 3D structure 23 2.5 Patch 55 Decoupling dielectric stubs 0.27 λ 0 Medium with 3D structure 20 4.75 Patch 56 Frequency selective surface 0.22 λ 0 Medium with 3D structure 18 4 Patch 57 Array-antenna decoupling surface 0.0...…”

Decoupling of Dual-Polarized Antenna Arrays Using Non-Resonant Metasurface

“…In [ 26 ], a 4 × 4 staggered array with diversified phase laggings and coupling level lower than −25 dB is designed by loading the ADS. In [ 27 ], the decoupling dielectric stubs (DDS) are proposed to reduce the mutual couplings of a 4 × 4 antenna array below −25 dB from 4.4 to 4.8 GHz. However, it requires a relatively high profile (half wavelength).…”