A high performance
            <scp>UWB MIMO</scp>
            antenna with defected ground structure and U‐shape branches

An eight-element meandered fed concentric annular ring slot resonator MIMO (multiple input multiple output) antenna array with dual-band operation is presented for sub-6 GHz 5G and unlicensed C-band Wi-Fi applications. The annular slot radiators are fed by meandered elements designed for operation at 3.15-3.9 and 6.27-6.6 GHz frequency bandwidth with enhanced isolation of more than 20 and 15 dB in the respective bands. The resonator rings are placed on the four corners of the smart-phone PCB with orthogonal meandered elements. The double-band operation is because of two rings and the isolation has been improved by meandered feed elements. The performances of the proposed MIMO antenna was analyzed and validated experimentally. The design offers sufficient gain of more than 5 dBi and efficiencies of upto 75% with better radiation coverages. The measured results of the MIMO antenna are found to be in good agreement with the simulated results. Further, the antenna has been studied for SAR effects as well as radiation coverages in the proximity of users head and handhead. The antenna housed on 130 Â 70mm 2 1:47λ 0 Â 0:79λ 0 ð Þcommon ground plane has provided good characteristics making it a potential candidate for sub-6 GHz C-Band 5G and unlicensed Wi-Fi smart-phone applications.

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“…The S-parameters of the MIMO system are used to obtain the ECC can be calculated by using below mentioned formula. 24,25…”

Section: Envelop Correlation Coefficient and Diversity Performancementioning

confidence: 99%

Orthogonally polarized meandered fed multiple input multiple output antenna array for C‐band sub‐6GHz 5G and unlicensed Wi‐Fi smart‐phone applications

Ishteyaq

Masoodi

Muzaffar

2021

Int J RF Mic Comp-Aid Eng

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“…However, high mutual coupling between the antenna elements can be a problem in MIMO systems. Many techniques, such as the orthogonal arrangement of the antenna elements [7], decoupling structures [8][9][10][11], quasi-self-complementary designs [12][13][14], and fractal structures [15], have been proposed for improving inter-element isolation. In [16], the radiating elements were wrapped around a cuboid polystyrene block to improve the correlation between them.…”

Section: Introductionmentioning

confidence: 99%

Design and Performance Analysis of a Compact Quad-Element UWB MIMO Antenna for Automotive Communications

et al. 2021

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This paper presents the design and analysis of a planar ultra-wideband (UWB) multiple-input-multiple-output (MIMO) antenna for modern vehicular communication systems. The proposed unit cell antenna structure was designed using modified elliptical radiators on a Rogers RO3003 substrate, has a size of 22 × 22 × 0.76 mm3, and covers an impedance bandwidth (S11 ≤ −10 dB) of 3.14 GHz to 12.24 GHz. The peak gain and efficiency of the unit cell prototype are 5.1 dBi and 81%, respectively. The unit cell was further developed into a MIMO antenna configuration with four elements placed orthogonal to each other in a single plane measuring 50 × 50 × 0.76 mm3. The measured isolation between the antenna elements was greater than 20 dB. The measured envelope correlation coefficient (ECC) of the MIMO antenna was less than 0.004, the diversity gain (DG) was greater than 9.67 dB, the total active reflection coefficient (TARC) was <−10 dB, and the mean effective gain (MEG) ratio was > 0.99. The characteristics of the proposed unit cell and the MIMO antenna were investigated for housing effects in order to validate the consistent performance of the antenna in the presence of conducting bodies. In addition, the radiation characteristics of the antenna when mounted on a vehicle were analyzed using a virtual model of the car. The results show that the proposed quad-element UWB MIMO array is compact, has good performance, and is well-suited for automotive applications.

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“…An array of slotted Y-shaped frequency selective surfaces along with an inverted L-structure provides isolation among the antenna elements [5], in which antenna elements are designed around a polystyrene block in a cuboidal geometry. Some other techniques are also used for isolation improvement like neutralization line between antenna elements [6], electromagnetic bandgap structure [7,8], introducing various defective ground structure (DGS) or stub and slot on antenna elements [9][10][11][12][13][14]. For isolation improvement, a carbon black film is used, and it absorbs electromagnetic signal [15].…”

Section: Introductionmentioning

confidence: 99%

“…In [16,17], a metamaterial, which is an artificial structure and magneto dielectric material, is used to decrease the mutual coupling by absorbing mutual interference signal. A DGS and U-shaped stubs are inserted on radiator [18,19] whereas a decoupling structure is used on top and bottom surfaces of the dielectric substrate to improve an isolation as well as bandwidth of the UWB MIMO antenna in [20]. Further, the overall size of the antenna is decrease by using asymmetric coplanar strip (ACS)-fed structure [21].…”

Section: Introductionmentioning

confidence: 99%

Compact Quad-Port High Performance Uwb Mimo/Diversity Antenna With Slotted Ground Structure

Keshri¹,

Chandel²,

Sahu³

et al. 2021

PIER C

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A compact 30 × 30 mm 2 high performance four elements ultra-wide band multi-input multi-output (UWB MIMO) diversity antenna is proposed. The prototype antenna consists of four symmetrical antenna elements which are orthogonally placed on top surface of the substrate with partial slotted ground plane. The isolation among the antenna elements is improved by placing antenna elements orthogonally without any additional decoupling structure. The various antenna characteristic parameters, i.e., return loss (< −10 dB), isolation parameter (< −22 dB), radiation patterns near omnidirectional, and maximum realized gain 4.8 dB, were measured. The MIMO performances of prototype antenna were also measured in terms of various MIMO diversity parameters and found ECC < 0.06, DG > 9.98 dB, TARC < −10 dB and MEG < −3 dB throughout the frequency band. This design provides an operational bandwidth from 2.15 to 16.75 GHz which covers the whole UWB spectrum and is suitable for portable devices.

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A high performance UWB MIMO antenna with defected ground structure and U‐shape branches

Cited by 33 publications

References 30 publications

Orthogonally polarized meandered fed multiple input multiple output antenna array for C‐band sub‐6GHz 5G and unlicensed Wi‐Fi smart‐phone applications

Orthogonally polarized meandered fed multiple input multiple output antenna array for C‐band sub‐6GHz 5G and unlicensed Wi‐Fi smart‐phone applications

Design and Performance Analysis of a Compact Quad-Element UWB MIMO Antenna for Automotive Communications

Compact Quad-Port High Performance Uwb Mimo/Diversity Antenna With Slotted Ground Structure

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