Compact 4-element MIMO antenna with isolation enhancement for 4G LTE terminals

Ikram, Muhammad; Hussain, Rifaqat; Ghalib, Asim; Sharawi, Mohammad S.

doi:10.1109/aps.2016.7695976

Cited by 31 publications

(22 citation statements)

References 5 publications

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“…There are several techniques of isolation improvement between MIMO antenna elements reported in literature . ‐ Applying negative permeability metamaterial in between two monopole antenna elements, mutual coupling is reduced by 9 dB around the operating frequency 2.45 GHz. In Ref.…”

Section: Introductionmentioning

confidence: 99%

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A compact four‐element MIMO antenna for WLAN applications

Pandit

Mohan

Ray

2018

Micro & Optical Tech Letters

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This article presents a compact four‐element multiple‐input multiple‐output (MIMO) antenna for wireless local area network applications. The overall volume of the proposed MIMO antenna is 26 mm × 26 mm × 0.8 mm and the edge‐to‐edge distance is 4 mm. The MIMO antenna operates at 5.6 to 5.8 GHz frequency band with isolation greater than 15.4 dB. The envelope correlation coefficient and the channel capacity loss for the proposed MIMO antenna are within the acceptable limits in the operating frequency band. The simulated results are verified with fabrication and measurements.

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Section: Introductionmentioning

confidence: 99%

“…In Ref. , defected ground structure (DGS) is used for mutual coupling reduction between the elements of a four‐element MIMO antenna which has a size of 0.70λ 0 × 0.42λ 0 at 2.1 GHz. The mutual coupling between the elements of the four‐element MIMO antenna is greater than 15 dB.…”

Section: Introductionmentioning

confidence: 99%

A compact four‐element MIMO antenna for WLAN applications

Pandit

Mohan

Ray

2018

Micro & Optical Tech Letters

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“…Because of the distinguished properties of the CM, such as orthogonal behavior and linear independence, TCM was used for the analysis and design of different types of antennas such as small antennas, wire antennas, dielectric antennas, handset antennas, printed multiple‐input‐multiple‐output (MIMO) antennas, pattern and frequency reconfigurable antennas, slot antennas, massive MIMO antennas, and chassis based antennas applied in unmanned air vehicle (UAV) and military applications . TCM was also used to enhance different antenna parameters such as enhancing isolation between MIMO antenna elements, obtaining enhanced BW and reducing the antenna resonance to lower frequencies .…”

Section: Introductionmentioning

confidence: 99%

New antenna mode generation based on theory of characteristic modes

Ghalib

Sharawi

2018

Int J RF Microw Comput Aided Eng

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In this article, the effect of actual antenna elements on rectangular chassis modes is investigated. The study is performed on three different antenna types, that is, printed inverted-F antenna (PIFA), printed monopole, and printed loop antennas. For the first time, we show that the presence of the antenna generates a completely new mode called the "antenna mode" (compared with chassis mode modifications as in other existing works). The new "antenna mode" only depends on the shape or geometry of the antenna and is independent of its location on the chassis (unlike chassis modes). In the presence of the antenna, the current maxima lies on the antenna element for all the modified chassis modes and the newly generated "antenna mode." In such scenarios, pure excitation of single characteristic mode (CM) is not possible with known existing techniques. K E Y W O R D S loop antenna, monopole, PIFA, TCM

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“…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%

“…TCM was applied on the analysis of various different types of antennas such as wire antennas, 21 handset antennas, 22 printed MIMO antennas, [23][24][25] and slot antennas. [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42] In Ref.…”

mentioning

confidence: 99%

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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Compact 4-element MIMO antenna with isolation enhancement for 4G LTE terminals

Cited by 31 publications

References 5 publications

A compact four‐element MIMO antenna for WLAN applications

A compact four‐element MIMO antenna for WLAN applications

New antenna mode generation based on theory of characteristic modes

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

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