Design of a printed MIMO/diversity monopole antenna for future generation handheld devices

See, Chan Hwang; Abd‐Alhameed, Raed A.; McEwan, N.J.; Jones, S. M. R.; Asif, Rameez; Excell, Peter S.

doi:10.1002/mmce.20767

Cited by 16 publications

(12 citation statements)

References 28 publications

(77 reference statements)

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“…Moreover, mutual coupling may increase correlation between channels and lead to reduced system capacity. As a result, MIMO antennas have to satisfy all the performance indicators of a single-element antenna while providing good mutual coupling between closely placed antenna elements [5].…”

Section: Introductionmentioning

confidence: 99%

Design of a Compact Orthogonal Broadband Printed Mimo Antennas for 5-GHZ Ism Band Operation

Naji¹

2015

PIER B

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Abstract-This paper presents a new design approach for compact orthogonal broadband printed multiple-input multiple-output (MIMO) antennas based on a coplanar waveguide (CPW)-fed hexagonalring monopole antenna (HRMA) element. The design procedure of the basic radiating element is initiated from a stripline (SL)-fed circular monopole antenna (CMA). Then various antennas involved in the design evolution process are introduced to attain a compact CPW-fed HRMA. This basic antenna element has a compact size of 13 × 10 mm 2 , 50% smaller than SL-fed CMA, and a prototype of this antenna is built and tested. Based on HRMA element, compact two-and four-element MIMO antenna systems are designed, fabricated and experimentally demonstrated for 5-GHz ISM band operation. The MIMO antenna systems use orthogonally configured of identical closely spaced HRMA elements, with CPW-fed printed on one side of the substrate to achieve good isolation. Design simulation is carried out with the aid of Computer Simulation Technology Microwave Studio (CST MWS) and confirmed with High Frequency Structure Simulator (HFSS). The experimental results are in close agreement with the simulated ones, which validates the design principle. Based on experimental results, the two MIMO antenna systems have an impedance bandwidth of more than 2 GHz, good isolation of less than 15 dB, and a low envelope correlation coefficient of better than −26 dB across the frequency band of (4-6 GHz), which are suitable for 5-GHz MIMO applications.

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Section: Introductionmentioning

confidence: 99%

Design of a Compact Orthogonal Broadband Printed Mimo Antennas for 5-GHZ Ism Band Operation

Naji¹

2015

PIER B

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“…Usually, the lower ECC and capacity loss are, the more possible the antenna array will be to be employed to a MIMO system. The correlation

{normalρ}_{normale}

and the capacity loss

C_{loss}

between antenna array elements can be calculated directly from the scattering parameters measured from the ports, and can be expressed by

{normalρ}_{normale} = \frac{{| S_{11}^{*} S_{12} + S_{21}^{*} S_{22} |}^{2}}{(1 - {| S_{11} |}^{2} - {| S_{21} |}^{2}) (1 - {| S_{22} |}^{2} - {| S_{12} |}^{2})}

C_{loss} = - \log_{2} \det true({normalψ}^{R} true)

where

{normalψ}^{R}

represents the receiving antenna correlation matrix and can be calculated by

{normalψ}^{R} = true[\begin{matrix} {normalρ}_{11} & {normalρ}_{12} \\ {normalρ}_{21} & {normalρ}_{22} \end{matrix} true]

with

{normalρ}_{i i} = false(1 - true({true| S_{i i} true|}^{2} + {true| S_{i j} true|}^{2} true) true)

, and

{normalρ}_{i j} = - true(S_{i i<...>}

…”

Section: Simulation and Measurement Resultsmentioning

confidence: 99%

“…Usually, the lower ECC and capacity loss are, the more possible the antenna array will be to be employed to a MIMO system. The correlation q e and the capacity loss C loss between antenna array elements can be calculated directly from the scattering parameters measured from the ports, and can be expressed by 16,17 q e 5 jS Ã 11 S 12 1S Ã 21 S 22 j 2 ð12jS 11 j 2 2jS 21 j 2 Þð12jS 22 j 2 2jS 12 j 2 Þ…”

Section: Ecc Capacity Loss and Radiation Efficiencymentioning

confidence: 99%

A novel combined structure for decoupling E/H-plane microstrip antenna array

Zou

Wang

2018

Int J RF Microw Comput Aided Eng

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A novel structure combined of an I‐shaped microstrip line and eight slots etched from the ground plane is proposed to decouple both E‐plane and H‐plane antenna arrays. Five types of antenna arrays at 5.25 GHz with different linear placements are discussed for the first time and the decoupling structure is valid to them all. The edge‐to‐edge distances of the H‐plane arrays and the E‐plane arrays are 0.09 normalλbold0 and 0.17 normalλbold0, respectively. Simulated and measured results indicate that the combined structure can effectively reduce the mutual coupling, with the maximum values reaching to 22.62, 28.41, 21.04, 22.33, and 26.04 dB for five types, respectively. The proposed structure is potential in the application of multielement arrays and communication MIMO system.

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“…In MIMO applications, antenna decoupling is an important factor to ensure high isolation, high efficiency, and low correlation. The normally used techniques include orthogonal polarization, decoupling networks, and additional decoupling structures (decouplers) . In the first method, high isolation and low correlation are achieved by sacrificing one of the antennas, since only one ground mode can support good antenna performance, especially at the lower frequency.…”

Section: Introductionmentioning

confidence: 99%

Compact wideband MIMO mobile‐antenna system design using mode‐based decoupling techniques

Piao

Kim

2019

Int J RF Microw Comput Aided Eng

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This work focuses on designing small mobile antennas and their multiple‐input multiple‐output (MIMO) applications. In this study, it was investigated that small mobile antennas can obtain high radiation performance only when a tight coupling with the ground plane is generated through ground‐mode tuning (GMT) of the ground plane. Furthermore, a novel mode‐based decoupling concept is presented for their MIMO applications, based on a four‐port network and by considering the ground‐mode effect. Consequently, the proposed mode‐based decouplers can effectively sustain high radiation performance and improve the isolation while providing low correlation by generating diagonally directed radiation patterns. In the proposed MIMO system, both GMT structures and mode‐based decouplers are implemented utilizing the metal rims around the ground plane, thereby occupying very compact clearance, and the measured MIMO antennas fully covered 0.69 to 1 GHz band with high isolation up to 20 dB and low envelope correlation coefficient (ECC) value below 0.5, sufficiently applicable in mobile devices.

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Design of a printed MIMO/diversity monopole antenna for future generation handheld devices

Cited by 16 publications

References 28 publications

Design of a Compact Orthogonal Broadband Printed Mimo Antennas for 5-GHZ Ism Band Operation

Design of a Compact Orthogonal Broadband Printed Mimo Antennas for 5-GHZ Ism Band Operation

A novel combined structure for decoupling E/H-plane microstrip antenna array

Compact wideband MIMO mobile‐antenna system design using mode‐based decoupling techniques

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