A Simple Decoupling Network With Filtering Response for Patch Antenna Arrays

Abstract

Facing the demand for decoupling and filtering for large-scale antenna arrays in modern communication systems, a transmission-line-based scheme is proposed and studied in this article. Different from other decoupling networks published recently featuring narrow decoupling bandwidths and high spurious levels, the proposed approach uses simple T-shaped networks where decoupling and filtering responses are realized simultaneously, leading to high frequency selectivity and improved decoupling bandwidth. The proposed design is a simple one-dimension configuration but powerful for two-dimension arrays. Based on the study case of a 4×4 dual-polarized patch array, theoretical analysis and full-wave simulation are carried out to verify the performance in the decoupling and frequency selectivity of this method. A prototype is further fabricated, assembled, and measured to demonstrate the performance of the proposed method in practice. The measured and simulated results are consistent with each other where a low insertion loss of around 0.6 dB is observed. The results denote that the proposed method is easily realized with a very small effect on the radiation performance of antenna elements, making it to be a potential and valuable decoupling and filtering solution for large-scale arrays.

Wideband decoupling technique for two‐element antenna array by using pixel neutralization line

“…Therefore, using decoupling technology to improve port isolation is an important issue. [2][3][4][5][6][7][8] Scholars all around the world have devoted to proposing different kinds of techniques to reduce mutual coupling, such as artificial structures, 9,10 characteristic modes (CMs), 11 capacitive, 12 parasitic elements, 13 decoupling networks, [14][15][16] neutralization line (NL), 17 and so forth. In the study by Nie et al, 18 two sets of feeding structures have the common ground plane between the two ports acquired by the adoption of a nonuniformly symmetric-coupled coplanar waveguide, which achieves high isolation.…”

“…S 21 = 0 is a requirement to guarantee high isolation, and from(14), it is inferred that y′ 21 = 0 can ensure S 21 = 0. It is worth noting that the matrix elements in Y 11 , Y 12 , Y 21 , and Y 22 can be acquired from the EM simulated results of the 86-port network.…”

Miniaturized Wide Scanning Angle Phased Array Using EBG Structure for 5G Applications

“…It is essential to reduce the coupling between antennas while reducing the spacing. Before this work, there are many mutual coupling reduction methods to be proposed, for example, decoupling networks [6,7], periodic structures such as electromagnetic bandgap structures [8,9], parasitic decoupling structures [10], and dummy elements [11].…”

A Novel Aperture-Loaded Decoupling Concept for Patch Antenna Arrays

“…In general, there are four aspects of decoupling methods, categorized by the physical active areas: a) loading decoupling surfaces above the antenna apertures [10], [13]- [15], b) introducing decoupling resonators, electromagnetic band gap structures, or dummy elements in between antenna elements [11], [16]- [20], c) etching or adding decoupling structures on the ground plane of the antennas [21]- [23], and d) utilizing decoupling networks at feeding layers [2]- [6], [12], [24]- [28].…”

“…Compared to the above works, decoupling methods carried out at the feeding layer often have great advantages of the low profile, small influence on radiation performance of the elements as well as the applicability of different antenna configurations [2]- [6], [12], [26]- [28]. Notice that injecting additional signal to the desired node to cancel the parasitic effect is a common method in microwave network field.…”