Mutual Coupling Reduction by Novel Fractal Defected Ground Structure Bandgap Filter

Wei, Kun; Li, Jianying; Wang, Ling; Xing, Zijian; Xu, Rui

doi:10.1109/tap.2016.2591058

Cited by 239 publications

(117 citation statements)

References 9 publications

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“…To eliminate mutual coupling between the antenna elements of a MIMO system, various design techniques are reported such as the use of defected ground structure (DGS), which exhibits band stop property over the operating band. However, the design utilizes large edge‐to‐edge space geometry due to placement of DGS in between the antenna elements.…”

Section: Introductionmentioning

confidence: 99%

Reduced edge‐to‐edge spaced MIMO antenna using parallel coupled line resonator for WLAN applications

Mark

Singh

Mandal

et al. 2019

Micro & Optical Tech Letters

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In this paper, a pair of parasitic parallel coupled line resonators (PCLR) is printed between the two patches that reduce the mutual coupling in multiple‐input‐multiple‐output (MIMO) antenna system. The proposed design offers reduced edge‐to‐edge spacing of 3.5 mm (0.066λo, λo is the free space wavelength) at 5.7 GHz. The proposed decoupling structure of length 0.49λo and area 0.05λo × 0.49λo consists of a pair of parallel coupled lines, placed between the antenna elements and provides a band stop properties over the desired operating band that helps to eradicate the near coupled field. The PCLR decoupling structure helps to improve the isolation and bandwidth by 16 dB and 0.22 GHz, respectively, at the resonating frequency without any change in radiation characteristics of the MIMO system. Moreover, the antenna system yields a good broadside gain of 6.43 dBi, efficiency 70–85%, with acceptable channel diversity performances over the entire operating band (5.47–5.9 GHz). Good agreements between the simulated and measured results make the proposed design approach suitable for a closely packed MIMO system.

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Section: Introductionmentioning

confidence: 99%

Reduced edge‐to‐edge spaced MIMO antenna using parallel coupled line resonator for WLAN applications

Mark

Singh

Mandal

et al. 2019

Micro & Optical Tech Letters

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“…Several techniques have been proposed to reduce the mutual coupling while the array elements are maintained close to each other. These methods utilize different parasitic elements, defected ground structures (DGS) polarization conversion isolators, metamaterial‐based DGSs, and electromagnetic band‐gap structures, and can considerably reduce the mutual coupling. However, they have some limitations: 1‐ they need a larger space or multiple layers for implementation, which increases the total size or the physical separation between antenna elements or leads to destructive effects on the radiations, 2‐ they have high design and fabrication complexity and cost, and 3‐ their back‐side radiation is increased which causes the front‐to‐back ratio and so the array gain to be reduced.…”

Section: Introductionmentioning

confidence: 99%

Design of a very closely‐spaced antenna array with a high reduction of mutual coupling using novel parasitic L‐shaped strips

Zaker

2018

Int J RF Microw Comput Aided Eng

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A very closely‐spaced 2 × 1 microstrip‐patch array antenna is proposed for present and future modern compact array systems. Between the antennas, a novel isolation structure developed from two parasitic L‐shaped strips with only one via for each one is presented to reduce the mutual coupling more than 53 dB at the resonant frequency in 10 GHz in comparison with the conventional array without any isolators. Unlike the other methods, this isolator has a simple and cost‐effective structure with a good performance, low destructive effects on the radiation and resonance position, low design and fabrication complexity, and simple optimization method which can notably block the surface and space waves between the antennas. Simplified semi‐analytical expressions and a guided‐wave‐length‐based parametric study are conducted on key geometrical parameters of the isolator circuit model to determine their effects on the overall behavior. To validate the technique and present its advantages, the final design has been fabricated, measured, and compared with the selected recently proposed suitable works. A good agreement was also achieved in comparison with the simulated results.

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“…Various efficient techniques and different types of isolation structures have been designed and analyzed to reduce the mutual coupling between MSAs. They include the optimization of the antenna dimensions so that the surface wave is not excited, printing various patterns on or within the substrate known as an electromagnetic bandgap structure, , or etching structures away from ground plane known as defected ground structure (DGS) , . The appropriate design of the extra structure in between the antennas creates an indirect signal coming via the further coupling path that opposes the signal going directly from element to element.…”

Section: Introductionmentioning

confidence: 99%

Mutual coupling suppression of closely spaced microstrip antennas by ladder‐shaped conducting wall

Alsultan

Yetkin

2018

Int J Communication

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Summary To reduce the mutual coupling between two closely microstrip antennas (MSAs), a novel ladder‐shaped conducting wall structure (LSCW) has been proposed and presented in this paper. This structure consists of two ladder shaped strips of copper printed on an FR‐4 dielectric substrate. It is inserted between the MSAs, and also some part of LSCW surrounds a portion of each antenna. The developed compact multiple‐input multiple‐output system has a compact size of 50 × 25 mm2, and dual‐band design resonates at 4.45 or 10.3‐GHz frequencies depending on the dimensions of LSCW structure. It can be used in many wireless applications in C (4‐8 GHz) band or X (8‐12 GHz) band. The value of VSWR ≤1.5 for both resonant frequencies. Also, the diversity performance, such as the envelope correlation coefficient, the diversity gain, and the total efficiency are calculated and compared. A prototype is fabricated, and the measured mutual coupling shows that the isolation between the antenna ports has been enhanced about 50 dB at 4.45 GHz and 40 dB at 10.3 GHz.

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Mutual Coupling Reduction by Novel Fractal Defected Ground Structure Bandgap Filter

Cited by 239 publications

References 9 publications

Reduced edge‐to‐edge spaced MIMO antenna using parallel coupled line resonator for WLAN applications

Reduced edge‐to‐edge spaced MIMO antenna using parallel coupled line resonator for WLAN applications

Design of a very closely‐spaced antenna array with a high reduction of mutual coupling using novel parasitic L‐shaped strips

Mutual coupling suppression of closely spaced microstrip antennas by ladder‐shaped conducting wall

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