Design of a Wideband, Tunable Four-Port MIMO Antenna System With High Isolation Based on the Theory of Characteristic Modes

Bouezzeddine, Montaha; Schroeder, Werner L.

doi:10.1109/tap.2016.2543757

Cited by 49 publications

(13 citation statements)

References 19 publications

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“…The slot antenna was reactively loaded using reverse-biased varactor diode. The concept can be extended using digitally tunable capacitors (DTCs) [19]. The DTCs are more appropriate to be utilised in high-power applications in CR platforms.…”

Section: Antenna Design Proceduresmentioning

confidence: 99%

Split‐ring‐resonator‐loaded multiband frequency agile slot‐based MIMO antenna system

Hussain

Khan

Almajali

et al. 2019

IET Microwaves, Antennas & Propagation

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In this work, a compact quad‐element multiple‐input‐multiple‐output (MIMO) antenna system is proposed. The design consists of four annular slot‐line based MIMO elements, printed on a commercially available RO4350 substrate with a total size of 60×120×0.76thinmathspacemnormalm3. Each annular slot has a rectangular slot inside it to increase its electrical length to further bring down the resonance frequency. Furthermore, a T‐shaped defected ground structure is utilised to increase the isolation between the closely spaced antenna elements. Each element is loaded with a unique split ring resonator (SRR), which results in size reduction as well as multi‐band operation covering 1.7–2.28, 2.35–2.85 and 2.9–3.1 GHz. Moreover, by using only a single varactor diode per element, fine frequency tuning over these bands is achieved. A wide frequency sweep over multi‐band and a peak gain of 2.95 dBi with 82% maximum radiation efficiency is achieved. Low envelope correlation coefficient values are observed throughout the operating band, thus offering good MIMO performance. The overall planar antenna design is compact, low‐profile and can easily be integrated with radio frequency front ends in second generation cognitive radios among many other applications.

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Section: Antenna Design Proceduresmentioning

confidence: 99%

Split‐ring‐resonator‐loaded multiband frequency agile slot‐based MIMO antenna system

Hussain

Khan

Almajali

et al. 2019

IET Microwaves, Antennas & Propagation

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“…Several methods have been proposed to improve the isolation of multi-antenna system [9,10], including orthogonal placement of the antenna elements [11], separating the elements with additional structure or slits, such as EBG [12], and using network between elements.…”

Section: Introductionmentioning

confidence: 99%

Multi-Band Omnidirectional Antenna With Hexagonal Prism Shape for Mimo Applications

Wang¹,

Tang²,

Zhang³

2017

PIER C

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Abstract-A multi-band antenna with omnidirectional radiation performance is proposed, which consists of 9 elements to form the structure of hexagonal prism. According to the placement rule, the antenna elements can be divided into two groups, one of which is placed in parallel on spaced three surfaces of the prism and the other placed vertically on the remaining spaced three faces of the prism. Each parallel element consists of two coplanar microstrip radiating patches which are nested within each other for miniaturization. Two parallel microstrips connected by a grounded disc with shorting pin are placed between the two patches to optimize the isolations. Each vertical element consists of two improved dipoles with four arms and a BALUN located at the back of the substrate plate which constitutes the quasi-Yagi structure. The resonant frequencies of the proposed prismatic antenna are 3.45 GHz, 4.9 GHz, 5.8 GHz and 15.2 GHz which can be used for low frequency bands of the fifth generation (5G) wireless communications and wireless local area networks (WLAN) as well as satellite communication applications.

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“…Providing distinct insights into operating mechanisms of antennas, TCM significantly benefits the design of multimode antennas [6]- [11]. As modal far-field patterns are orthogonal to each other, exciting pure characteristic modes (CMs) through specific feeding methods leads to high port-to-port isolations.…”

mentioning

confidence: 99%

“…As modal far-field patterns are orthogonal to each other, exciting pure characteristic modes (CMs) through specific feeding methods leads to high port-to-port isolations. In [11], a four-mode MIMO antenna covering a tunable frequency from 470 to 790 MHz was realized on a femto-cell factor structure. A 220 × 220 × 140 mm 3 box was analyzed with TCM, and the four modes were excited through an internal tunable matching network.…”

mentioning

confidence: 99%

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Radiation Energy and Mutual Coupling Evaluation for Multimode MIMO Antenna Based on the Theory of Characteristic Mode

Zhang

Alkaraki

et al. 2019

IEEE Trans. Antennas Propagat.

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This paper presents a novel method to evaluate radiation energy and mutual coupling in multimode antennas. Based on the theory of characteristics mode, how much each mode occupies the radiation and the mutual coupling from each feeding port is calculated with the modal energy occupied coefficients. Furthermore, the linear transformation of feeding network in multimode antenna system has been adopted to complete the modal-based method. Then, this method is utilized to analyze and decrease the mutual coupling between feeding ports. Hence, a hexagonal wideband antenna is proposed with its evolution process and measured to validate the proposed method. The presented hexagonal antenna is a four-port multimode antenna consisting a planar hexagonal plate, vertical tapered baluns, and feeding network at the ground plane. The whole antenna works in 3-6 GHz and all its four ports are well matched with high port-to-port isolation.

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Design of a Wideband, Tunable Four-Port MIMO Antenna System With High Isolation Based on the Theory of Characteristic Modes

Cited by 49 publications

References 19 publications

Split‐ring‐resonator‐loaded multiband frequency agile slot‐based MIMO antenna system

Split‐ring‐resonator‐loaded multiband frequency agile slot‐based MIMO antenna system

Multi-Band Omnidirectional Antenna With Hexagonal Prism Shape for Mimo Applications

Radiation Energy and Mutual Coupling Evaluation for Multimode MIMO Antenna Based on the Theory of Characteristic Mode

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