TCM Analysis of Defected Ground Structures for MIMO Antenna Designs in Mobile Terminals

Ghalib, Asim; Sharawi, Mohammad S.

doi:10.1109/access.2017.2739419

Cited by 64 publications

(39 citation statements)

References 28 publications

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“…Moreover, the circular parasitic patch is loaded at the center of the MIMO antenna together with 4 L‐shaped branches placed counterclockwise. The volume occupied by this antenna is only 30 × 30× 0.8 mm 3 , which is smaller than the 4 × 4 MIMO antenna in References .…”

Section: Antenna Design and Radiation Principlementioning

confidence: 86%

A compact pattern diversity MIMO antenna with enhanced bandwidth and high‐isolation characteristics for WLAN/5G/WiFi applications

Yang

Zhou

2020

Micro & Optical Tech Letters

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In this article, a novel multiple input multiple output (MIMO) antenna with compact structure and diverse radiation patterns is designed for a wireless communication device. Four monopole antenna elements are placed orthogonally at the corner of the substrate. A decoupling structure composed of a circular patch and 4 L‐shaped branches placed counterclockwise is printed on the upper surface of the substrate to reduce coupling between antenna elements. Due to the surface current on the circular parasitic patch, which was acquired by coupling with the monopole antenna, the MIMO antenna exhibits an omnidirectional radiation pattern at low frequencies and a directional radiation pattern at high frequencies. In order to verify the accuracy of theoretical analysis and simulated results, the proposed antenna with a compact size of 30 mm × 30 mm is fabricated and measured. The measured results show that the overlapping bandwidths (S11 ≤ −10 dB) are 28.8% from 4.58 to 6.12 GHz and over 4.02 dBi gain. Furthermore, the measured results of pattern diversity are basically consistent with the simulated results, and the measured isolation is up to 15.4 dB, which suggest that the presented antenna can be applied to WLAN/5G/WiFi wireless communication.

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Section: Antenna Design and Radiation Principlementioning

confidence: 86%

A compact pattern diversity MIMO antenna with enhanced bandwidth and high‐isolation characteristics for WLAN/5G/WiFi applications

Yang

Zhou

2020

Micro & Optical Tech Letters

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“…From the CM current distribution of the single‐element and 4‐element MIMO cases shown in Figures and , respectively, we can observe that the current concentration lies across the slot and we have to deal with more modes in our desired BW. Although the analysis of isolation can be performed in the line with the work in Ref …”

Section: Antenna System Designmentioning

confidence: 99%

“…TCM was applied on the analysis of various different types of antennas such as wire antennas, handset antennas, printed MIMO antennas, and slot antennas . In Ref.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of slot-based radiators using TCM and its application in MIMO antennas

Ghalib

Hussain

Sharawi

2018

Int J RF Microw Comput Aided Eng

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In this article, with the help of the theory of characteristic modes (TCM), it is found that the introduction of circular slots in a chassis modifies the chassis modes. Based on the location of the slot, different chassis modes will be affected. For a fixed location, the slot to chassis size ratio plays an important role in its effect on the radiating bandwidth (BW). For a small size ratio, a modified chassis mode will be created without affecting the radiating BW. The current concentration across the slot depends on the shape of the slot (circular, rectangular, triangular, or square) and its location on the chassis. Moreover, the effect of multiple circular slots on the chassis modes is investigated. For slots introduced in a symmetrical fashion, that is, four elements, the modes are not affected and are similar to the original chassis ones. We also investigate the principle behind frequency reconfigurability using TCM analysis. The varactors used for frequency reconfigurability do not alter the radiating BW (Modal Significance plots) but only help in the input impedance matching at different frequency bands of the same mode. If a mode is excited purely using a proper feeding arrangement, the same frequency reconfigurable antenna will behave as a wide band one. Based on the detailed analysis presented in this work, a compact multiple‐input‐multiple‐output annular slot frequency reconfigurable antenna operating between 1.8 and 2.45 GHz is presented. Frequency tuning is achieved using varactor diodes.

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“…Then a neutralization line is utilized to reduce mutual coupling. Based on the same design steps, various decoupling structures were introduced for isolation enhancement, such as parasitic elements [8], defected ground structure [9], and metamaterial [10].…”

Section: Introductionmentioning

confidence: 99%

A compact planar UWB MIMO antenna using modified ground stub structure

Yin

Hong

Luo

et al. 2017

IEICE Electron. Express

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A novel UWB-MIMO antenna with high isolation is presented. The proposed antenna consists of two identical UWB elements. Each antenna element is evolved from the off-center-fed patch antenna and its operating frequency band covers the ultra-wideband. The modified ground, as part of the antenna radiator, can improve isolation by propagating through the restraining surface. In addition, the ground stub between the two elements, changes the surface current distribution, makes the surface current truncated and drawn, and obviously reduces the coupling between the ports, so that the antenna always has good isolation in the UWB. The miniaturized MIMO antenna with a size of only 30 × 40 mm 2 and measured mutual coupling lower than −18 dB, covers the 3.1-10.6 GHz UWB band, suitable for UWB wireless communication system.

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TCM Analysis of Defected Ground Structures for MIMO Antenna Designs in Mobile Terminals

Cited by 64 publications

References 28 publications

A compact pattern diversity MIMO antenna with enhanced bandwidth and high‐isolation characteristics for WLAN/5G/WiFi applications

A compact pattern diversity MIMO antenna with enhanced bandwidth and high‐isolation characteristics for WLAN/5G/WiFi applications

Analysis of slot-based radiators using TCM and its application in MIMO antennas

A compact planar UWB MIMO antenna using modified ground stub structure

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