Isolation Enhancement in Closely Coupled Dual-Band MIMO Patch Antennas

Niu, Zicheng; Zhang, Hou; Chen, Qiang; Zhong, Tao

doi:10.1109/lawp.2019.2928230

Cited by 117 publications

(51 citation statements)

References 19 publications

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“…To consolidate the isolation characteristics of antenna, in antenna 4, the H shape DGS is etched on the ground plane along the radiating edge of the antenna devoted to reverse part of the common ground current, which counteracts the partial coupling currents to increase isolation. The working mechanism of H shape DGS was elaborately analyzed in [29], so this paper only provides simulated S parameters. The reflection coefficient S11 and transmission coefficient S21 with and without H shape DGS are exhibited in Fig.…”

Section: Decoupling Conceptmentioning

confidence: 99%

Enhancing MIMO Antenna Isolation Characteristic by Manipulating the Propagation of Surface Wave

Yang

Xiao

2020

IEEE Access

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Multiple-input multiple-output (MIMO) antennas have been a mainstream technology in fifth generation (5G) communications. However, strong mutual coupling between both adjacent and nonadjacent elements is inevitable, especially among highly integrated devices. In this paper, a slit embedded mushroom electromagnetic bandgap structure (EBG) is primarily proposed to suppress the propagation of surface wave between antenna elements. Subsequently, complementary split-ring resonators (CSRRs) are periodically arranged in two sides of the ground to steer the surface wave. By effectively utilizing the unusual electromagnetic property of EBG and CSRR to manipulate the propagation of surface wave, the mutual coupling between antenna elements has immensely alleviated. Finally, an H-shape defected ground structure (DGS) is introduced to reinforce decoupling effect. In order to validate the feasibility of the design principle, a prototype of the proposed antenna has been fabricated and measured. Measured results demonstrate that the decoupling concept in this paper is reasonable and approximately 12 dB reduction of mutual coupling is realized. INDEX TERMS Multiple-input multiple-output (MIMO), mutual coupling, slit embedded electromagnetic bandgap structure (EBG), complementary split-ring resonator (CSRR).

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Section: Decoupling Conceptmentioning

confidence: 99%

Enhancing MIMO Antenna Isolation Characteristic by Manipulating the Propagation of Surface Wave

Yang

Xiao

2020

IEEE Access

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“…Also, 17.5 dB maximum isolation improvement between linear antenna array that comprises of three‐element was obtained in Reference ; the coupling reduction was achieved using T‐shaped and rectangular ring defective ground surface within the impedance bandwidth of 3.95‐4.04 GHz. Also, in Reference , 28.4 and 25.9 dB isolation improvement were achieved at the 3.7 GHz and 4.1 GHz dual band resonance of a MIMO patch antenna, using H‐shaped defective ground surface and modified antenna decoupling surface.…”

Section: Introductionmentioning

confidence: 98%

Highly reduced mutual coupling between wideband patch antenna array using multiresonance EBG structure and defective ground surface

Sokunbi

Attia

2019

Micro & Optical Tech Letters

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This paper presents a novel slotted wideband microstrip patch antenna array with 2 decoupling structures that enabled isolation enhancement between 10 and 40 dB throughout the operating bandwidth of 4‐6.5 GHz. Four asymmetrical patches were first used as a unit cell to produce a multiresonance electromagnetic band gap (EBG) structure capable of increasing the isolation between the patch array by about 50 dB within the impedance bandwidth of 5.8‐6.4 GHz. By introducing 3 double F‐shaped etchings in the array ground plane, the isolation bandwidth is extended to 4.0‐6.5 GHz (ie, 48%) with measured isolation improvement of 10‐40 dB over the entire isolation bandwidth. The multiresonance EBG structure mitigates the surface waves propagating in the substrate while the double F‐shaped ground plane reduces the surface waves traveling on the ground plane. The edge‐to‐edge spacing between the 2 patch antennas is 25.2 mm which is equivalent to 0.42 λ0 (λ0 is the free‐space wavelength at the center frequency of 5.0 GHz). After loading the decoupling structures in the antenna array, the gain increased from 5.6 dB to 7 dB. The proposed antenna is fabricated and there is an acceptable agreement between the simulated and measured results. The antenna radiation characteristics are observed to be fairly consistent over the large operating bandwidth of 4‐6.5 GHz. The proposed antenna is a potential candidate for wideband wireless applications in the sub‐6 GHz band.

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“…Moreover, the used of an array-antenna decoupling surface for the improvement of isolation is first presented in two practical examples [37]. Then, a modified array decoupling surface is utilized for the decoupling of a dual band antenna [38]. Next, an EBG surface [39] is adapted as a ground for decoupling in the millimeter wave band which is different from the metasurface.…”

Section: Introductionmentioning

confidence: 99%

A Meta-Surface Antenna Array Decoupling (MAAD) Design to Improve the Isolation Performance in a MIMO System

Wang

Yin

2020

IEEE Access

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In this paper, a design to reduce the mutual coupling between two closely MIMO antennas is presented. A metasurface superstrate consisting of periodic circular split ring resonator (CSRR) elements is placed above the coupled two-element patch antennas to improve the isolation performance. The propagation of the electromagnetic wave from antenna 1 to antenna 2 causing mutual coupling will be blocked since the loading of metasurface, which can be considered as a negative-permeability medium. First, the size of the CSRR element is determined by properly designing the range of negative permeability in the desire band. Thereafter, a decoupled MIMO array with a high isolation performance is realized with an intolerable matching curve. Then, some measures are employed on each patch to enhance the matching performance, such as etching slots and loading short probes on the patches. Next, two prototypes for the coupled and decoupled arrays are fabricated and measured to verify the improvement of the isolation performance. Measured results show that the value of |S21| for the decoupled array has been greatly improved from −8 dB to less than −20 dB within the entire working band of 5.58-6.0 GHz. Meanwhile, the match bandwidth of |S11| < −15 dB for the decoupled array is approximately 420 MHz, which has also been improved in the desire band compared with the coupled array. In addition, the measured gains for the decoupled array are improved by approximately 1.8 dB as compared to the coupled array, whereas the efficiencies are increased by 16% which is higher than the coupled array. Moreover, the envelope correlation coefficient (ECC) for the decoupled array is reduced from 0.17 to 0.06 within the entire band of interest. Therefore, all measured results demonstrate that the proposed MAAD design is a good candidate for the improvement of MIMO antenna arrays. INDEX TERMS MIMO, metasurface antenna array decoupling (MAAD), split ring resonators (SRRs).

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Isolation Enhancement in Closely Coupled Dual-Band MIMO Patch Antennas

Cited by 117 publications

References 19 publications

Enhancing MIMO Antenna Isolation Characteristic by Manipulating the Propagation of Surface Wave

Enhancing MIMO Antenna Isolation Characteristic by Manipulating the Propagation of Surface Wave

Highly reduced mutual coupling between wideband patch antenna array using multiresonance EBG structure and defective ground surface

A Meta-Surface Antenna Array Decoupling (MAAD) Design to Improve the Isolation Performance in a MIMO System

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