Compact Uwb Mimo Ground Linearly Tapered Slot Antenna Decoupled by a Stepped Slot

Huang, Huaxiong; Xiao, Sanshui

doi:10.2528/pierc16112502

Cited by 3 publications

(1 citation statement)

References 18 publications

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“…(Diversity configuration of Figure 1). [19] parallel 69.90% 28% [20] parallel 44.94% 52% [21] parallel 37.5% 45% [22] parallel 66% 90% [23] parallel 57% 90% [24] parallel 55% 100% [25] parallel 120% 74% [26] parallel 90% 95% [27] parallel 50% 45% Present work parallel 100% 100% Figure 14. Simulated radiation efficiency of the proposed UWB MIMO antenna.…”

Section: Comparison Of Reported Antenna Structuresmentioning

confidence: 99%

A Compact Uwb Printed Monopole Mimo Antenna With Mutual Coupling Reduction

Babashah¹,

Hassani²,

Mohammad-Ali-Nezhad³

2019

PIER C

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A compact multiple-input-multiple-output (MIMO) antenna with very high isolation is proposed for ultrawideband (UWB) applications. The antenna with a compact size of 30.1 × 20.5 mm 2 (0.31λ 0 × 0.21λ 0) consists of two planar-monopole antenna elements. It is found that isolation of more than 25 dB can be achieved between two parallel monopole antenna elements. For the lowfrequency isolation, an efficient technique of bending the feed-line and applying a new protruded ground is introduced. To increase isolation, a design based on suppressing surface wave, near-field, and far-field coupling is applied. The simulation and measurement results of the proposed antenna with the good agreement are presented and show a bandwidth with S 11 ≤ −10 dB, S 12 ≤ −25 dB ranged from 3.1 to 10.6 GHz making the proposed antenna a good candidate for UWB MIMO systems. 1. INTRODUCTION MIMO technology has aroused interest because of its application in 4G, RFID, Digital Home, and WLAN. Demand for high data rate and, as a result, huge bandwidth is increasing. In 2002 US-FCC approved unlicensed use of 3.1-10.6 GHz frequency band at low energy level [1]. Therefore in order to improve the capacity of the system, UWB MIMO antenna has been developed for commercial systems. UWB MIMO antenna with high isolation has application in short-range high-data-rate, transmission automotive communications, and radar imaging systems [2, 3]. When several antennas are in close proximity, they suffer from severe mutual coupling, which results in lower antenna efficiency and loss of bandwidth, and further degrades the performance of either diversity gain or spatial multiplexing schemes [3]. So the question then arises as to how to put together antenna elements with low coupling and occupying the least possible space. Because these two properties contradict each other, the problem is very challenging. The mutual coupling is also attributed to three phenomena: near-field coupling, far-field coupling, and surface wave coupling [4]. Many techniques and MIMO structures have been proposed for compact MIMO systems. In [5-7], the size of the proposed antenna was not small enough for the present portable devices. In [8, 9], the proposed antenna was not able to cover the entire UWB bandwidth allocated by the FCC [1]. In [3, 5] and [10-13] unlike our purposed antenna, the antenna elements were perpendicular to each other. None of the above could attain a very high isolation with S 12 < −30 dB in such a small size while covering the whole UWB bandwidth. Certain techniques are also reported to improve isolation. Methods include using simple and fractalbased DGS [14], EBG [15], soft surface structures [16], and Metamaterial-Inspired Isolatorin between the antenna elements [17], etc. Among the aforementioned designs, none of them could achieve very high isolation in such a small size at low-frequency levels because in small size structures reducing mutual coupling at these frequencies due to long wavelength is very challenging.

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Section: Comparison Of Reported Antenna Structuresmentioning

confidence: 99%

A Compact Uwb Printed Monopole Mimo Antenna With Mutual Coupling Reduction

Babashah¹,

Hassani²,

Mohammad-Ali-Nezhad³

2019

PIER C

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A metamaterial‐based compact broadband planar monopole MIMO antenna with high isolation

Wang

Yang

Wang

2020

Micro & Optical Tech Letters

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A miniaturized broadband planar monopole multiple‐input‐multiple‐output (MIMO) antenna is proposed for the 3.5 GHz frequency band of the Long‐Term Evolution Advanced application. Two novel broadband metamaterial split‐ring resonator units are used to reduce the mutual coupling of the MIMO antenna, also expanding the antenna impedance bandwidth. The size of the whole antenna is 47.5 mm × 40 mm × 1.6 mm (1.15λg × 0.97λg × 0.039λg) and the center distance between the two antenna elements is only 0.25λ0. The measured results agree well with the simulated ones. The measured 10‐dB impedance bandwidth is 3.35 to 3.78 GHz (12.3%), and the isolation is up to 15 dB within the bandwidth.

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