Isolation enhancement of a wideband <scp>MIMO</scp> antenna using floating parasitic elements

Khan, Muhammad Saeed; Capobianco, Antonio-Daniele; Shafique, Muhammad Farhan; Ijaz, Bilal; Naqvi, A.; Braaten, Benjamin D.

doi:10.1002/mop.29162

Cited by 67 publications

(36 citation statements)

References 18 publications

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“…Figure shows the MIMO antenna and surface current distribution (with and without the coupling structure). From Figure (C), (D), it is observed that the effect of mutual coupling is less in antenna due to the parasitic element …”

Section: Isolation Techniquesmentioning

confidence: 99%

Multiport MIMO antennas with mutual coupling reduction techniques for modern wireless transreceive operations: A review

Chouhan

Panda

Gupta

et al. 2017

Int J RF Microw Comput Aided Eng

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The present technology fulfills the requirement of high data rate and high channel capacity using multiple input multiple output (MIMO) technology. The MIMO capacity of the system is increased linearly but due to the multiple antennas placed near to each other, problem of mutual coupling exists, which degrades the maximum achievable performance of the system. The problems of multipath propagation can be solved using MIMO system. The isolation improvement methods decrease the mutual coupling among antenna elements, and improve the gain and efficiency of the system. In this paper, decoupling network isolation approach, parasitic element approach, defected ground structure, Neutralization line, isolation improvement based on metamaterials, isolation improvement using PIN diode, varactor diode, and feeding structure have been incorporated, and their merits and demerits have been discussed. The effect of different permittivity material on antenna parameters has also included.

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Section: Isolation Techniquesmentioning

confidence: 99%

Multiport MIMO antennas with mutual coupling reduction techniques for modern wireless transreceive operations: A review

Chouhan

Panda

Gupta

et al. 2017

Int J RF Microw Comput Aided Eng

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“…Thus, the major problem in MIMO antenna designs is to suppress the mutual coupling while maintaining a compact antenna configuration. Recently, various decoupling methods have been reported in open literature [3][4][5][6][7][8][9][10][11][12][13]. Usually, antenna elements of different types combined in [3,4] can achieve high isolation, yet the MIMO antennas possess different impedance matchings and radiation characteristics between ports.…”

Section: Introductionmentioning

confidence: 99%

“…A tree-like structure extending from the ground is adopted in [5] to cut down the wideband mutual coupling between the radiating elements. By using the parasitic elements, the MIMO antennas in [6,7] achieve isolation enhancement over a wide bandwidth. However, the wideband decoupling methods often make the antennas relatively large in size and complicated in structure.…”

Section: Introductionmentioning

confidence: 99%

Compact 1×2 and 2×2 Mimo Antennas With Enhanced Isolation for Ultrawideband Application

Li¹,

Liu²,

Wang³

et al. 2017

PIER C

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Abstract-Two small size multiple-input-multiple-out (MIMO) antennas with high isolation for ultrawideband (UWB) applications are presented. A two-element MIMO antenna, which is mounted on an FR4 substrate with a compact size of 24 mm × 33 mm, consists of two symmetric circular monopole elements and a modified ground. The protruded ground provides a way to improve isolation and impedance matching. Such a wide band from 2.75 to 11 GHz is achieved by using modified ground technology, and high isolation more than 20 dB is also accomplished. Meanwhile, moderate gain and omnidirectional radiation patterns can be obtained. Based on the circular monopole with modified ground, a four-element antenna array is also constructed and studied. The size of the four-element antenna with orthogonal arrangement is 44 mm × 44 mm. Measured results show that the antenna also exhibits good impedance matching as well as low envelope correlation coefficient over the entire UWB spectrum.

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“…The Multiple‐Input and Multiple‐Output (MIMO) technology, which employs several antenna elements in one system, is a key technology for wireless communication system . The application of MIMO technology has been regarded as a significant way to improve the reliability and channel capacity of the wireless communication systems without any increase in transmit power or bandwidth . However, due to the spatial limitation of the modern wireless communication devices, the mutual coupling between MIMO antenna elements in the miniature devices could be very strong, which would result in signal distortion seriously .…”

Section: Introductionmentioning

confidence: 99%

A compact MIMO antenna system for WLAN with enhanced isolation

Li¹,

You

Ge³

et al. 2016

Micro & Optical Tech Letters

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X resistor, coaxial line C5 1/90 obtained with a dual six-port network analyzer. The calibration elements were the air (open standard), the short standard, and match load (Agilent 85070D kit).The measurement results of both reflection and transmission coefficients are relatively close to ideal values. For improving the results, calibration is required to obtain a well-conditioned solution. CONCLUSIONA dual-band six-port reflectometer has been designed and manufactured to measure the reflection coefficients of two-port networks at the frequency of 0.915 GHz and 2.45 GHz. An ADS simulation and experimental measurements were performed to show some significant features of the dual-band six-port network analyzer in a wide frequency range of 2.2-2.6 GHz and 0.8-1 GHz. Six-port output powers are read using eight diode detectors and all four scattering parameters related to DUT are measured using the expressions given in section 2. Measurement results for different loads are compared with ideal values that are in good agreement in terms of phase and magnitude of the reflection coefficients. Using this technique, we decreased the cost and complexity of devices. In addition, it is well suited for portable application testers outside the laboratory.ABSTRACT: A compact multiple-input and multiple-output (MIMO) monopole antenna system for WLAN (2.45 GHz) with enhanced isolation is proposed. The proposed MIMO antenna system consists of two identical monopole antenna elements operating at the same frequency of 2.45 GHz. In order to improve the isolation performance, each antenna element is individually placed on one side of the substrate. With meandered strips, the size of the proposed antenna system is dramatically decreased to 15.9 mm 3 9 mm. The isolation between the two antenna elements exceeds 18.29 dB by employing the orthogonal polarization diversity technique and the physical isolation method. The 10 dB bandwidth of the proposed antenna system reaches 120 MHz, which is wide enough for the practical application. Measured results are in close agreement with the simulated ones.

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Isolation enhancement of a wideband MIMO antenna using floating parasitic elements

Cited by 67 publications

References 18 publications

Multiport MIMO antennas with mutual coupling reduction techniques for modern wireless transreceive operations: A review

Multiport MIMO antennas with mutual coupling reduction techniques for modern wireless transreceive operations: A review

Compact 1×2 and 2×2 Mimo Antennas With Enhanced Isolation for Ultrawideband Application

A compact MIMO antenna system for WLAN with enhanced isolation

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