A Compact, High Isolation and Wide Bandwidth Antenna Array for Long Term Evolution Wireless Devices

Ayatollahi, M.; Rao, Qinjiang; Wang, D.

doi:10.1109/tap.2012.2207312

Cited by 62 publications

(33 citation statements)

References 11 publications

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“…The radiating edge of the patch is symmetric. The design and dimensions are chosen to be useful for applications in higher frequency [6][7][8]. The feed provided is 50 ohms and the length of the feed is adjusted accordingly as shown in Fig.…”

Section: Antenna Design Imentioning

confidence: 99%

Miniaturized Multiband Mimo Antennas for Wireless Application

Das

Kommuri

2017

Asian J Pharm Clin Res

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Section: Antenna Design Imentioning

confidence: 99%

Miniaturized Multiband Mimo Antennas for Wireless Application

Das

Kommuri

2017

Asian J Pharm Clin Res

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“…In this paper, we assume the antennas are operating in an isotopic/uniform multi-path condition (XPR = 1 and P θ = P φ = 1/4π) [13,14].…”

Section: Worst-case Estimate Of Eccmentioning

confidence: 99%

Worst-Case Estimate of Envelope Correlation Coefficient for Small MIMO Mobile Antennas Below 1 GHz

Zhao¹,

Tak²,

Choi³

2015

Journal of electromagnetic engineering and science

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A worst-case estimate of an envelope correlation coefficient (ECC) is obtained for small multiple-input multiple-output (MIMO) mobile antennas operating below 1 GHz. The worst-case estimate is numerically derived in this paper using spherical and exponential wave functions. The derived result confirms that the worst-case ECC can be easily obtained from the rotation angle between the radiation patterns of two MIMO elements, which are attained directly from the amplitude of 2D electric field patterns without any additional phase and polarization information. As a practical example, MIMO mobile antennas with different antenna element arrangements are compared to verify the validity of the proposed worst-case estimate. Moreover, based on these analyses, we also suggest an effective approach to reduce the ECC of a small MIMO mobile antenna operating below 1 GHz by properly locating the antenna elements to make the radiation patterns perpendicular to each other. This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/ by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. ⓒ Copyright The Korean Institute of Electromagnetic Engineering and Science. All Rights Reserved. ZHAO et al.: WORST-CASE ESTIMATE OF ENVELOPE CORRELATION COEFFICIENT FOR SMALL MIMO MOBILE ANTENNAS BELOW 1 GHz 45worst-case estimate of the ECC through a direct derivation using the spherical and exponential wave functions. Then, the correctness of this worst-case estimate is verified by comparing MIMO mobile antennas that operate at 0.8 GHz and under different arrangements of the antenna elements. Moreover, by investigating the different factors (rotation angle, translation of phase centers, and occasional pattern variance) related to the ECC, we prove the rotation angle, which is chosen to estimate the worst-case ECC, is also an effective applicable factor to reduce the ECC for a MIMO mobile antenna below 1 GHz. A low ECC can be attained when the rotation angle of a MIMO mobile antenna approaches 90° by locating two antenna elements on the perpendicular edges of the ground plane. II. WORST-CASE ESTIMATE OF ECCIn this paper, we assume the antennas are operating in an isotopic/uniform multi-path condition (XPR = 1 and P θ = P φ = 1/4π) [13,14].Based on the above assumption, the ECC ( e  ) is inversely proportional to the diversity of the radiation patterns and can be expressed in the spherical coordinate Ω = ( θ , ϕ ) using thewhere, and E θ n and E ϕ n are the θ -and ϕ -polarized complex electric field intensities of the antenna element n. Meanwhile, we note the diversity and corresponding ECC are mainly determined by three factors (rotation angle, translation of phase centers, and occasional pattern variance) in MI-MO antennas. Thus, our investigation of the worst-case ECC will start by exploring and comparing these three factors.In addition, we analyz...

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“…Various methods have been devised to improve isolation between the elements of a narrowband MIMO antenna, e.g., [3][4][5][6][7][8][9][10][11][12]. In [3,4], good isolation is achieved by adding parasitic elements, which can create a reverse coupling to reduce mutual coupling.…”

Section: Multiple-input Multiple-output (Mimo) Technology Hasmentioning

confidence: 99%

“…However, this method occupies significant areas. Other isolation enhanced techniques, such as incorporating a protruded ground between the antennas [9,10], inserting slits into the ground [11], applying multi-port conjugate (MC) match [12], are also used. Nowadays, broadband and Ultra-wideband (UWB) MIMO antenna represents a very appealing solution for multi-standard device because of the increasing number of operating frequency bands required in mobile terminals.…”

Section: Multiple-input Multiple-output (Mimo) Technology Hasmentioning

confidence: 99%

Design of a Compact Wideband Mimo Antenna for Mobile Terminals

Xia¹,

Chu

Li³

2013

PIER C

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Abstract-A new broadband multiple-input multiple-output (MIMO) antenna with good isolation and compact size is proposed. The proposed antenna consists of two G-shaped elements in the upper layer and two inverted L protrude branches and a T slot etched in ground which is used to reduce the mutual coupling. This planar antenna has a bandwidth of 100% with |S 11 | ≤ −10 dB from 2.26 to 6.78 GHz. The value of isolation between the two antenna elements is more than 22.5 dB in the whole band. The experimental results verify the simulations.

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A Compact, High Isolation and Wide Bandwidth Antenna Array for Long Term Evolution Wireless Devices

Cited by 62 publications

References 11 publications

Miniaturized Multiband Mimo Antennas for Wireless Application

Miniaturized Multiband Mimo Antennas for Wireless Application

Worst-Case Estimate of Envelope Correlation Coefficient for Small MIMO Mobile Antennas Below 1 GHz

Design of a Compact Wideband Mimo Antenna for Mobile Terminals

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