A Second Order Decoupling Design Using a Resonator and an Interdigital Capacitor for a Mimo Antenna Pair

Wang, Ziyang; Zhao, Luyu; Chen, Aobo; Yin, Yingzeng

doi:10.2528/pierl17012301

Cited by 6 publications

(4 citation statements)

References 19 publications

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“…Several techniques have been proposed in the literature to improve isolation within MIMO antenna elements, for instance, implementation of neutralization lines [5,6] and decoupling networks such as modi ed T-shaped [7], metamaterial inspired structure [8]. Also, combining decoupling structures with other techniques such as a matching network in [9] and an interdigital capacitor in [10] provides improved isolation levels. Authors in [11,12] have implemented comb-shaped and modi ed T-shaped ground planes for isolation enhancement.…”

Section: Introductionmentioning

confidence: 99%

“…Further, a combined methodology of implementing both CMA and metamaterials proposed in [31][32][33] suggests a unique approach to improving isolation levels within MIMO antenna elements. The designs proposed in [5][6][7][8][9][10][11][12] exhibit a high level of isolation levels (S 12 >-20dB) along with wide bandwidth; however, structures are quite complex and bulky. The technique implemented in [13] does improve isolation level to -15dB but has a large area, whereas in [14], high isolation is achieved within a narrow bandwidth.…”

Section: Introductionmentioning

confidence: 99%

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RETRACTED: Design of Metamaterial Loaded Wideband Sub-6GHz 2×1 MIMO Antenna with Enhanced Isolation Using Characteristic Mode Analysis

Sharma

Khanna

Kapur

2022

Preprint

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In this paper, a modified rhombus-shaped antenna for a sub-6GHz range of 5G is designed and analyzed using characteristic mode analysis (CMA). The proposed antenna is extended to form a 2×1 MIMO antenna with a wide bandwidth of 2600MHz (3.2-5.8GHz). The high level of mutual coupling (|S21|=-12.31dB at 4.75GHz) exhibited by MIMO antenna is mitigated with the help of modified hexagonal-shaped mu-negative (MNG) metamaterial unit cells. Using CMA, MNG unit cells are placed such that orthogonal modes are generated within MIMO antenna elements resulting in a high isolation level (S21>-25dB) for the entire bandwidth (with peak value of -34.4dB at 4.75GHz). This also aids in the miniaturization of MIMO antenna by the close placement of antenna elements with an edge-to-edge gap of 0.13λ (λ is the resonating frequency). The proposed MIMO antenna with MNG unit cells (called MNG-MIMO) retains wide-bandwidth (2600 MHz), a low envelope correlation coefficient (ECC <0.001), high diversity gain (DG=9.9dB), the high radiation efficiency of 82%, and exhibits circular polarization (Axial ratio <3dB) in the frequency range of 4.56-4.89GHz. In order to highlight the practicality of the proposed MNG-MIMO antenna, it is extended to form an eight-element MNG-MIMO antenna (called eight-element MNG-MIMO) with a large ground plane of 170×80mm2. The simulated response of eight-element MNG-MIMO indicates no change in efficiency and ECC levels with a minor variation in isolation is observed. Thus with a compact volume of 990mm3, the proposed design is fit for various 5G and IoT applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

RETRACTED: Design of Metamaterial Loaded Wideband Sub-6GHz 2×1 MIMO Antenna with Enhanced Isolation Using Characteristic Mode Analysis

Sharma

Khanna

Kapur

2022

Preprint

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“…With further requirements of high data rate and reliable link quality, multiple-input-and-multipleoutput (MIMO) technology has been greatly introduced in modern wireless communication. As an important part, massive antenna elements are utilized to exploit multipath environments and provide multiplexing/diversity channel gain [1][2][3]. However, this generally leads to large overall size and poor isolation.…”

Section: Introductionmentioning

confidence: 99%

Compact Four-Element Mimo Antenna System Based on Substrate-Integrated-Waveguide Cavities

Niu¹,

Tan²

2020

PIER Letters

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A compact four-element multiple-input-and-multiple-output (MIMO) antenna system is proposed based on substrate-integrated-waveguide (SIW) cavities. By bisecting a square SIW cavity, two rectangle half-mode cavities with opened edges are formed. They are arranged side by side sharing a row of metallic vias. Then two narrow T-shaped slots are etched along symmetry planes to divide these two cavities into four quarter-mode sub-cavities. Excited by feeding ports, four antenna elements with compact size are constructed, which radiate incident wave through opened cavity edges and etched slots. Moreover, antenna isolation can be easily improved by adjusting slot length though these elements interconnect. A prototype with the cavity size of 0.22λ 0 × 0.86λ 0 × 0.04λ 0 has been fabricated. The fabricated MIMO antenna system exhibits the center frequency of 3.51 GHz, port isolation of 14 dB, envelope correlation coefficient of 0.03, peak gain of 4.9 dBi, and high efficiency of 77.4%. The compact size and effective isolation improvement make the proposed design attractive for practical applications.

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“…However, two antenna elements constructed in an HM SIW cavity have been rarely studies up to now. On the other hand, a number of techniques have been proposed to enhance the isolation between antenna elements, such as optimization of antenna configuration [8], introduction of isolating elements [9,10], and utilization of a decoupling network [11]. However, MIMO antennas adopting these methods usually have large overall size, complex structures, and low radiation efficiency [12].…”

Section: Introductionmentioning

confidence: 99%

Compact Two-Element Mimo Antenna Based on Half-Mode Siw Cavity With High Isolation

Niu¹,

Tan²

2019

PIER Letters

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A compact two-element multiple-input-multiple-output (MIMO) antenna with high isolation is proposed in this paper. It is based on a half-mode substrate-integrated-waveguide (SIW) cavity where three edges are shorted by metallic vias, and one edge is opened to radiate cavity energy into free space. Fed by coaxial ports, two antenna elements are constructed in the SIW cavity, and a narrow T-shaped slot is introduced to enhance the isolation between them. High port isolation can be achieved by adjusting the slot length although these antenna elements are connected with each other. A prototype has been fabricated and measured. With the compact cavity size of 0.22λ 0 × 0.44λ 0 , the fabricated antenna achieves the operating frequency of 3.51 GHz, enhanced isolation of 18.0 dB, low envelope correlation coefficient of 0.006, peak gain of 5.2 dBi, and high efficiency of 82.6%. Therefore, the proposed MIMO antenna has potential applications for wireless communication.

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A Second Order Decoupling Design Using a Resonator and an Interdigital Capacitor for a Mimo Antenna Pair

Cited by 6 publications

References 19 publications

RETRACTED: Design of Metamaterial Loaded Wideband Sub-6GHz 2×1 MIMO Antenna with Enhanced Isolation Using Characteristic Mode Analysis

RETRACTED: Design of Metamaterial Loaded Wideband Sub-6GHz 2×1 MIMO Antenna with Enhanced Isolation Using Characteristic Mode Analysis

Compact Four-Element Mimo Antenna System Based on Substrate-Integrated-Waveguide Cavities

Compact Two-Element Mimo Antenna Based on Half-Mode Siw Cavity With High Isolation

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