Decoupling of Microstrip Antennas With Defected Ground Structure Using the Common/Differential Mode Theory

Qian, Bingyi; Chen, Xiaoming; Kishk, Ahmed A.

doi:10.1109/lawp.2021.3064972

Cited by 56 publications

(13 citation statements)

References 24 publications

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“…[18][19][20] The envelope cross-correlation (ECC) is used to verify the independence of radiation patterns of elements and it can be calculated from the complex far-field patterns. 21,22 A comparison between reference and proposed antennas for ECC is plotted in Figure 5c. The proposed design has a lower value of below 0.005, which is lower than the reference design.…”

Section: Experimental Validation and Resultsmentioning

confidence: 99%

Isolation enhancement for four‐element MIMO antenna by using novel meandering technique

Cheng

Wang

2022

Micro & Optical Tech Letters

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The paper proposes a four‐element printed multiple‐input‐multiple‐output (MIMO) antenna with high isolation achieved by employing a compact decoupling method. The optimal shaping (meandering) of the monopole strip is adopted to realize decoupling at the working frequency band ranging from 5.004 to 5.320 GHz. The ports isolation S 21 ${S}_{21}$ and S 41 ${S}_{41}$ are improved by using self‐meandering technology with transmission zero occurring at the frequencies of 5.004 and 5.320 GHz, respectively. Meanwhile, the isolation S 31 ${S}_{31}$ is also greatly increased. The decoupling technique can significantly improve the isolations between the four ports of the proposed antenna, without the extra‐added structure. A four‐element MIMO antenna with an edge‐to‐edge spacing of 0.069 λ 0 ${\lambda }_{0}$ ( λ 0 ${\lambda }_{0}$ is the wavelength at 5.162 GHz in free space) is fabricated and measured. In the experiment, the proposed MIMO antenna has a relative bandwidth (reflection coefficient of −10 dB) of 6.12% with a range from 5.004 to 5.32 GHz. In addition, this design can significantly obtain higher port isolation, antenna efficiency, gain, and a lower envelope correlation coefficient (ECC).

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Section: Experimental Validation and Resultsmentioning

confidence: 99%

Isolation enhancement for four‐element MIMO antenna by using novel meandering technique

Cheng

Wang

2022

Micro & Optical Tech Letters

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“…To reduce the mutual coupling between adjacent antennas, a lot of decoupling methods have been proposed [4][5][6][7][8][9][10] and one of the effective methods is to place a defective ground structure (DGS) between two adjacent antennas [11]. To further reduce the degree of mutual coupling, parasitic loading is introduced to generate contrary coupling, while [12] has proposed the technique of embedding non-radiating elements between antenna elements to alter the current distribution that results in affecting the antenna radiation and achieves the purpose of reducing the mutual coupling.…”

Section: Introductionmentioning

confidence: 99%

Decoupling Technique Based on Field Distribution on Ground Plane for WLAN MIMO Antenna Applications

Zhou¹,

Ma²,

Pang³

et al. 2023

ACES Journal

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An efficiently-decoupling method for multiple-input multiple-output (MIMO) antenna systems is proposed in this paper. A planar-modified monopole antenna operating at the WLAN band is chosen as the antenna unit. The antenna structure is based on the printed circuit board technique. By observing and analyzing the ground plane’s field distribution generated by high-order modes, it is found that several stable minimum current points can be excited along the edges of the ground plane. In doing so, a high isolation can be obtained if the other antenna is placed at one of these points. The measured results and simulated results have a good agreement with each other, which well validates the proposed design concept. In addition, compared with the traditional decoupling technology, this method can improve the isolation between antennas without adding additional structures, which has excellent practicality in wireless communication system applications.

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“…In the past few decades, researchers have made much effort to reduce the interferences between array elements, and different methods have been proposed [ 16 , 17 , 18 , 19 , 20 , 21 ]. The first method is directly suppressing the propagation of surface wave coupling and space wave coupling, such as electromagnetic bandgap (EBG) structures [ 16 ], defected ground (DGS) [ 17 ], and resonators [ 18 ]. These methods can effectively reduce the coupling of the array based on the frequency responses of these decoupling structures, yet these decoupling structures usually work in a narrow band.…”

Section: Introductionmentioning

confidence: 99%

Decoupling of Dual-Polarized Antenna Arrays Using Non-Resonant Metasurface

Luo

Mei

Zhang

et al. 2022

Sensors

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A non-resonant metasurface (NRMS) concept is reported in this paper to improve the isolation of dual-polarized and wideband large-scale antenna arrays. By properly designing the NRMS, it can perform stable negative permeability and positive permittivity along the tangential direction of the NRMS within a wide band, which can be fully employed to suppress the mutual couplings of large-scale antenna arrays. At the same time, the proposed NRMS can also result in positive permittivity and permeability along the normal direction of the NRMS, which guarantees the free propagation of electromagnetic waves from antenna arrays along the normal direction. For demonstration, a 4×4 dual-polarized antenna array loading with the proposed NRMS is designed to improve the isolations of the antenna array. The simulations demonstrate that the isolations among all ports are over 24 dB from 4.36 to 4.94 GHz, which are experimentally verified by the measured results. Moreover, the radiation patterns of antenna elements are still maintained after leveraging the proposed NRMS. Due to the simple structure of the proposed NRMS, it is very promising to be widely employed for massive MIMO antenna arrays.

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Decoupling of Microstrip Antennas With Defected Ground Structure Using the Common/Differential Mode Theory

Cited by 56 publications

References 24 publications

Isolation enhancement for four‐element MIMO antenna by using novel meandering technique

Isolation enhancement for four‐element MIMO antenna by using novel meandering technique

Decoupling Technique Based on Field Distribution on Ground Plane for WLAN MIMO Antenna Applications

Decoupling of Dual-Polarized Antenna Arrays Using Non-Resonant Metasurface

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