Novel Dual-Band Decoupling Network for Two-Element Closely Spaced Array Using Synthesized Microstrip Lines

Lin, Kai-Chi; Wu, Cheng-Hsun; Lai, Chi-Hui; Ma, Tzyh‐Ghuang

doi:10.1109/tap.2012.2207687

Cited by 68 publications

(26 citation statements)

References 32 publications

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“…It is obvious that both patch elements exhibit good impedance matching in the range from 3.3-3.6 GHz, where the reflection coefficient < -10 dB. They also exhibit excellent isolation levels for the cross-pol ports, i.e., they are as high as 35 It is readily observed that the port isolation of the same polarization has been significantly improved over the entire operational band. In particular, |S13| (|S24|) is decreased from -18.67 dB (-18.36 dB) to -32.19 dB (-25.42 dB), witnessing a reduction in the coupling levels of ~13.52 dB (~ 7.06 dB).…”

Section: Mutual Coupling Reduction Mechanismsmentioning

confidence: 94%

“…2 ( |S23| and |S14| ) remain very low and almost unchanged. In comparison with most previously reported isolation elements and strategies, which are effective in only one specific direction , use high-Q decoupling networks [34][35][36][37][38], or introduce modified ground planes [39], our decoupling approach is suitable over a wide frequency range for both polarizations and for large arrays with arbitrary lattice configurations. Furthermore, when compared to a recently reported dual-polarized array decoupling technology that depends on a ~1.3 λ0 inter-element separation [41], our approach with its much smaller Accepted for publication in IEEE Transactions on Antennas and Propagation inter-element distance, ~0.6 λ0, is more suitable for high-density arrays.…”

Section: Mutual Coupling Reduction Mechanismsmentioning

confidence: 99%

“…A second class of mutual coupling suppressors relies on the construction of decoupling networks behind the radiators. There are two versions of these networks, i.e., distributed [34][35][36][37] and lumped [38] ones. A third set of mutual coupling reducers involves simply rearranging the radiator positions within the array without resorting to any auxiliary structure.…”

mentioning

confidence: 99%

“…This specificity limits their applications to only single-polarized arrays; it is ineffective for dual-/multi-polarized arrays . The decoupling networks suffer from quite narrow bandwidths and, hence, cannot be applied to wideband arrays [34][35][36][37][38]. The ground plane related strategies can only be utilized when the ground planes are limited in size and, hence, they cannot be applied to large arrays [39].…”

mentioning

confidence: 99%

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Mutual Coupling Reduction Using Meta-Structures for Wideband, Dual-Polarized, and High-Density Patch Arrays

Tang

Chen

Wang

et al. 2017

IEEE Trans. Antennas Propagat.

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-A mutual coupling reduction strategy that employs meta-structures is introduced for wideband, dual-polarized, high-density, planar, patch antenna arrays. The meta-structures consist of two types of resonators: grounded capacitively loaded loops (GCLLs) and π-shaped elements. By incorporating the meta-structures into the array configuration, the isolation levels between adjacent radiating elements in both the E-and H-plane orientations are improved by as much as 7.15 dB. The surface current distribution behaviors of the array with only the GCLLs and with only the π-shaped elements are investigated thoroughly to explain the mutual coupling reduction mechanisms. A proof-of-concept array was constructed and tests were performed that validate the reported design principles and simulation results. M. (5G) communication systems [1,2]. It has several unique advantages that arise from its ability to facilitate the presence of additional signal channels instead of requiring the use of extra frequency spectrum or power. Benefits include being able to increase the data capacity and to make the system more adaptable. Index TermsMIMO approaches are based on antenna arrays. With the ever increasing demand for more capacity, it is anticipated that massive MIMO will be central to 5G systems; and it will be facilitated by compact dense arrays. However, strong inter-element coupling occurs when the element spacing is small; it dramatically increases the spatial correlations and seriously deteriorates the signal-to-interference-plus-noise -ratio (SINR) [3]. Consequently, mutual coupling effects between array elements have attracted intense attention.There exist a plethora of reported approaches that are capable of reducing the mutual coupling in the physical layer. However, because of known fundamental physical limitations [4], it cannot be eliminated completely. Nevertheless, mutual coupling reduction can significantly improve the performance of MIMO systems.In general, the existing, most widely used mutual coupling reduction strategies can be classified into the following three categories. One approach focuses on introducing a variety of compact isolation elements between the radiators. The choices have been rather diverse. They include parasitic elements, such as monopoles [5], scatterers [6], and radiation patches [7]. Also, they include electromagnetic band-gap (EBG) structures, such as mushroom-like EBG structures [8], F-shaped EBG structures [9], and uniplanar compact EBG structures [10,11]. Defected ground structures (DGSs), such as periodic rectangular slits [12], back-to-back U-shaped slots [13], T-shaped slots [14], and loop slots [15] have also been used. More recently, numerous metamaterial-inspired structures have been considered, such as folded single split ring resonators [16], grounded split-ring resonators (GSRRs) [17], multiple split-ring resonators (MSRRs) [18] While the above strategies have reduced mutual coupling, one witnesses certain drawbacks accompanying each of them. As a result, their widespre...

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Section: Mutual Coupling Reduction Mechanismsmentioning

confidence: 94%

Section: Mutual Coupling Reduction Mechanismsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Mutual Coupling Reduction Using Meta-Structures for Wideband, Dual-Polarized, and High-Density Patch Arrays

Tang

Chen

Wang

et al. 2017

IEEE Trans. Antennas Propagat.

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“…When two linearly polarized antennas are placed orthogonally to each other, they can decrease the mutual coupling and offer polarization diversity [18,19]. The mutual coupling between adjacent antenna elements can be reduced by using decoupling networks such as 180 • hybrid coupler and coupled resonator [20,21]. These networks will decouple the input ports of adjacent antennas by providing an electromagnetic field such that it cancels the EM fields introduced between the adjacent antennas.…”

Section: Introductionmentioning

confidence: 99%

Compact 2×1 Mimo Antenna System for Lte Band

Malathi¹,

Thiripurasundari²

2017

PIER C

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Abstract-A compact 2 × 1 multiple input multiple output (MIMO) antenna system is designed to operate in the LTE band 40 (2.3-2.4) GHz. The proposed antenna consists of two circular patches fed using microstrip line. The antenna was initially designed to resonate at 5 GHz. Size reduction of 55.17% compared to conventional patch antenna is obtained after the inclusion of circular complementary split ring resonator (CSRR) in the ground plane. The resonating frequency was shifted to 2.34 GHz, thereby the board size is compact (50 × 25 × 1.6 mm 3 ). The designed antenna covers a bandwidth of 2.3 to 2.374 GHz with a maximum return loss of −27 dB at 2.34 GHz and isolation of −33.5 dB between the ports. The simulated correlation coefficient is approximately zero, and the total active reflection coefficient is 0.142 at the resonating frequency which are within the acceptable limits. The realized gain for the antenna is −8.9 dB.

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Compact MIMO Antenna Systems

2019

Low‐cost Smart Antennas

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Novel Dual-Band Decoupling Network for Two-Element Closely Spaced Array Using Synthesized Microstrip Lines

Cited by 68 publications

References 32 publications

Mutual Coupling Reduction Using Meta-Structures for Wideband, Dual-Polarized, and High-Density Patch Arrays

Mutual Coupling Reduction Using Meta-Structures for Wideband, Dual-Polarized, and High-Density Patch Arrays

Compact 2×1 Mimo Antenna System for Lte Band

Compact MIMO Antenna Systems

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