Ultrawideband MIMO/Diversity Antennas With a Tree-Like Structure to Enhance Wideband Isolation

Zhang, Shuai; Ying, Zhinong; Xiong, Jiang; He, Sailing

doi:10.1109/lawp.2009.2037027

Cited by 358 publications

(31 citation statements)

References 10 publications

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“…Various studies had been performed to boost the isolation of the antenna ports [3][4][5][6][7][8][9][10][11][12][13]. A tree-like parasitic structure [3], or mushroom like EBG structure [4][5][6] can minimize the mutual coupling among radiating components though restraining the surface wave propagation.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mutual Coupling Reduction for Dual-Band MIMO Antenna with Simple Structure

Luo¹,

Hong²,

Amin³

2017

RADIOENGINEERING

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Section: Introductionmentioning

confidence: 99%

“…A tree-like parasitic structure [3], or mushroom like EBG structure [4][5][6] can minimize the mutual coupling among radiating components though restraining the surface wave propagation. The defected ground structure [7] or a simple ground plane modification [8] performing as a band-stop filter was designed to increase the isolation.…”

Section: Introductionmentioning

confidence: 99%

Mutual Coupling Reduction for Dual-Band MIMO Antenna with Simple Structure

Luo¹,

Hong²,

Amin³

2017

RADIOENGINEERING

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“…Ultrawideband (UWB) system combined with MIMO technology can provide data rates more than 1 Gb/s [4] [5]. However, one of the main challenges to the design of MIMO antennas for portable devices is low mutual coupling in small space [6] [7].…”

Section: Introductionmentioning

confidence: 99%

A Compact UWB MIMO Antenna for Portable Applications

Hu¹,

Lü²

2016

JEMAA

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A novel compact multiple-input-multiple-output (MIMO) antenna for portable ultrawideband (UWB) applications is presented. This antenna consists of two modified planar-monopole antenna elements with coplanar waveguides-fed printed on one side of the substrate. To enhance isolation and increase impedance bandwidth, a tree like stubs is placed on the ground plane at the 45˚ axis. The measured results show that the MIMO antenna operates from 2.3 GHz to 13 GHz, covering WLAN, Wi-MAX, and UWB. The low mutual coupling and low envelope correlation coefficient of less than 0.2 across the whole frequency band proved that this antenna was suitable for MIMO/diversity systems. Also, good performance of radiation patterns and the antenna's compact size make it a good candidate for portable devices. KeywordsMultiple-Input-Multiple-Output (MIMO) Antenna, Pattern Diversity, Planar Monopole, Ultrawideband (UWB) 8, 240-246. http://dx.

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“…Strong coupling is observed when the monopoles are in near proximity, so that a decoupling structure was introduced on the back side of the substrate, centrally located between the two patches. The use of parasitic elements to decouple two closely spaced antennas has been already proposed in the literature [4][5][6], especially for increasing the diversity performance of multiantenna systems, but this technique has been only recently exploited in MW radar imaging [3] and for a significantly wider bandwidth.…”

mentioning

confidence: 99%

“…A parametric study through CST commercial software [7] was carried out to design the decoupling structure depicted in Fig 1b: similar to what has been presented in [3], the T-shaped decoupling structure serves to create an additional current path on the ground in order to cancel the initial currents causing the coupling [4]; but in this work, the introduction of multiple vertical strips of unequal length permits one to obtain a better wide-band isolation effect [6], whereas the horizontal strips allow a better control of the impedance matching [5]: as a conclusion, higher isolation and an even smaller footprint were achieved. Comparison of the simulated scattering parameter S 21 with and without the decoupling structure is reported in Fig.…”

mentioning

confidence: 99%

3–18 GHz compact planar antenna for short‐range radar imaging

Capobianco¹,

Khan²,

Caruso³

et al. 2014

Electron. lett.

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An ultra-compact planar antenna aiming to be part of an imaging antenna array operating in the broad 3-18 GHz frequency range is presented. The antenna is made of two closely packed wide-band monopoles for simultaneous transmission and reception functionalities. A high isolation ( >20 dB) between the two patches is achieved through the insertion of a structured ground plane (decoupling structure). A prototype was fabricated on a Roger R4003c laminate measuring 58 × 33 mm 2 and used in inverse synthetic array radar configuration for detecting a steel object with sub-centimetre spatial resolution.Introduction: Microwave (MW) radar imaging has become more and more attractive for a variety of applications, ranging from security to structural integrity investigation in civil engineering. Moreover, in recent years MW radar imaging has received increased interest in early stage breast cancer detection as a valid and low-cost alternative to X-ray mammography. In this particular application, frequencies between 3 and 20 GHz are used to balance higher spatial resolution with longer penetration depth. In all cases, a medium to large number of antennas is needed for building the imaging array together with a complex electromechanical switching system to interface the array with the radar transceiver [1]. The switching system may be large in size, introduces losses and limits the number of simultaneous acquisitions. Consequently, research has moved to a different solution in which each antenna element is directly connected with an integrated transceiver to form the basic module of the imaging array: this allows one to obtain a compact, higher performance and lower-cost imaging system [2,3].In this Letter, the design of a couple of planar, closely packed wideband monopoles to be used in the basic module of the imaging array, is presented. The radar antenna operates in the broad 3-18 GHz frequency range guaranteeing an isolation between the transmitting and the receiving patches >20 dB, thanks to the use of a structured ground plane which acts as decoupling structures. The proposed design results in an ultra-compact footprint measuring 58 × 33 mm 2 only. A prototype was fabricated on a Roger R4003c laminate and used in an imaging experiment exploiting the inverse synthetic array radar (ISAR) configuration to successfully detect a steel object with sub-centimetre spatial resolution.

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Ultrawideband MIMO/Diversity Antennas With a Tree-Like Structure to Enhance Wideband Isolation

Cited by 358 publications

References 10 publications

Mutual Coupling Reduction for Dual-Band MIMO Antenna with Simple Structure

Mutual Coupling Reduction for Dual-Band MIMO Antenna with Simple Structure

A Compact UWB MIMO Antenna for Portable Applications

3–18 GHz compact planar antenna for short‐range radar imaging

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