Integrated decoupling and matching network incorporated in the ground plane of a compact monopole array

Abstract

Nonlinear optical loop mirror based on standard communication fiber, J Lightwave Technol 15 (1997), 642-646. 11. J.M. Baptista, S.F. Santos, G. Rego, O. Frazão, and J.L. Santos, Micro-displacement or bending measurement using a long-period fibre grating in a self-referenced fibre optic intensity sensor, Opt Commun 260 (2006), 8-11.ABSTRACT: Compact arrays enable various applications such as antenna beam-forming and multi-input, multi-output (MIMO) schemes on limited-size platforms. The reduced element spacing in compact arrays introduces high levels of mutual coupling which can affect the performance of the adaptive array. This coupling causes a mismatch at the input ports, which disturbs the performance of the individual elements in the array and affects the implementation of beam steering. In this article, a reactive decoupling network for a 3-element monopole array is used to establish port isolation while simultaneously matching input impedance at each port to the system impendence. The integrated decoupling and matching network is incorporated in the ground plane of the monopole array, providing further development scope for beamforming using phase shifters and power splitters in double-layered circuits.

Compact-Transmission-Line Decoupling and Matching Network of Three-Element Array for Wireless Applications

“…The decoupling circuit for the antenna array with three elements by using the eigenmode method [32,33] is very complicated, in which at least two couplers are required, so it is not included in the comparison. Table 2 gives previous works on using the conjugate matching method [34][35][36][37] to decouple three-element antenna arrays. According The envelope correlation coefficient (ECC) represents the correlation between antenna patterns, and its formula is as follows:…”

“…In addition, the circuit utilizes a star instead of a triangular decoupling structure, which is more effective for folding the circuit at the area surrounded by the array. Consequently, the area occupied by the matching and decoupling network is greatly reduced compared with the existing schemes [34][35][36][37]. Compared with [37], which has the best performance in miniaturization, the solution presented in this paper has a relative size reduction of 17%.…”

“…The design of the decoupling network in [34] is investigated using lumped components, which are implemented with microstrip transmission lines by Kuroda's identity. In the design principle stage of [35,36], transmission lines are used directly, which greatly reduces the circuit area. Decoupling circuits using coupled resonators are presented in [37].…”

Mutual coupling reduction in antenna arrays using the novel mushroom electromagnetic band gap and defected ground structure

“…5 Another method is to design decoupled networks to achieve impedance match, so that electromagnetic energy is coupled into the network without being received by adjacent array elements. [6][7][8] The complementary split ring resonator printed on the substrate can also suppress the mutual coupling. 9 In [10][11][12] defected ground structures (DGS) achieve the purpose of enhancing port isolation by preventing the propagation of surface waves on the ground plane.…”

“…Similarly, mutual coupling can also be suppressed by eliciting branch structures from the ground 5 . Another method is to design decoupled networks to achieve impedance match, so that electromagnetic energy is coupled into the network without being received by adjacent array elements 6–8 . The complementary split ring resonator printed on the substrate can also suppress the mutual coupling 9 .…”