Compact Dual-Frequency Microstrip Antenna Array With Increased Isolation Using Neutralization Lines

Yu, Yantao; Yi, Lijun; Liu, Xiaoya; Gu, Zhaokai

doi:10.2528/pierl15081709

Cited by 6 publications

(3 citation statements)

References 15 publications

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“…Several types of transmission lines that directly connect adjacent antenna elements have also been applied to reduce the mutual coupling. These transmission lines provide effective decoupling current pathways; examples include neutralization lines [30][31][32] and feedforward lines [33]. A second class of mutual coupling suppressors relies on the construction of decoupling networks behind the radiators.…”

mentioning

confidence: 99%

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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confidence: 99%

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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“…However, the coupling is difficult to control when more than two closely spaced antennas are employed. e second type of decoupling for MIMO antenna involves inserting a decoupling structure between the antenna elements to block or suppress the coupling, which includes defected ground structure [5], complementary split-ring resonator [6], electromagnetic bandgap [7], neutralization line [8], T-shaped stub [9], and ring strip [10]. However, these structures increase the space between antenna elements, which results in larger antenna sizes.…”

Section: Introductionmentioning

confidence: 99%

Dual-Band 2 × 2 MIMO Antenna with Compact Size and High Isolation Based on Half-Mode SIW

Elobied

Yang

Xie

et al. 2020

International Journal of Antennas and Propagation

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This paper presents a close-spaced dual-band 2 × 2 multiple-input multiple-output (MIMO) antenna with high isolation based on half-mode substrate integrated waveguide (HMSIW). The dual-band operation of the antenna element is achieved by loading a rectangular patch outside the radiating aperture of an HMSIW cavity. The HMSIW cavity is excited by a coaxial probe, whereas the rectangular patch is energized through proximity coupling by the radiating aperture of HMSIW. The antenna elements can be closely placed using the rotation and orthogonal arrangement for a 2 × 2 array. Small neutralization lines at the center of the MIMO antenna can increase the isolation among its elements by around 10 dB in the lower band and 5 dB in the higher band. A prototype of the MIMO antenna is fabricated and its performance is measured. The measured results show that the resonant frequencies are centered at 4.43 and 5.39 GHz with bandwidths of 110 and 80 MHz and peak gains of 6 and 6.4 dBi, respectively. The minimum isolation in both bands is greater than 35 dB. The envelope correlation coefficient is lower than 0.005 within two operating bands.

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“…In the world, there have been many proposed antennas for applications to next-generation mobile communications systems, namely 5G, which focus on the design of micro-strip antennas or PIFA antennas with dimensions compact, meet the good insulation and radiation at the appropriate frequency. A number of research results on antennas for typical 5G systems may be included in the studies [2][3][4][5], most of which focus on single antennas, only a few are studying about MIMO systems, further studies about MIMO antenna with most mutual reduction by methods changing the direction and the position. These methods have a big disadvantage, that is increasing the distance between the antennas to increase the size of the MIMO antenna system, which will cause the change of the antenna position and is hard to apply to designing antennas for devices in the system 5G, where almost all devices must meet the criteria of compact.…”

Section: Introductionmentioning

confidence: 99%

Design of high isolation dual-band MIMO antenna using single neutral line

My¹

2019

jst

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A dual-band MIMO antenna with a high isolation is presented in this paper. The proposed MIMO antenna consists of two identical E-shaped micro-strip antennas which are designed on an FR4 substrate. The antenna is designed for radiating at 2.6 GHz and 5 GHz that can be used for the applications of 4G and 5G systems, respectively. Neutral line technique is used for mutual coupling reduction between the E-shaped antenna. Good isolation characteristics are obtained by using single micro-strip line connected between two elements of MIMO antenna. The antenna is fabricated and measured, and good agreement is achieved between the experimental and simulated results.

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Compact Dual-Frequency Microstrip Antenna Array With Increased Isolation Using Neutralization Lines

Cited by 6 publications

References 15 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

Dual-Band 2 × 2 MIMO Antenna with Compact Size and High Isolation Based on Half-Mode SIW

Design of high isolation dual-band MIMO antenna using single neutral line

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