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Author

Sudhakar Sahu

Bio: Sudhakar Sahu is an academic researcher from KIIT University. The author has contributed to research in topics: Antenna (radio) & Microstrip antenna. The author has an hindex of 10, co-authored 91 publications receiving 339 citations.


Papers
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TL;DR: In this article, the authors proposed a compact (43 × 26 × 08 mm3) dual-band two-element metamaterial-inspired MIMO antenna system with high port isolation for LTE and WiMAX applications.
Abstract: This article proposes a compact (43 × 26 × 08 mm3) dual-band two-element metamaterial-inspired MIMO antenna system with high port isolation for LTE and WiMAX applications In this structure, each antenna element consists of a square–ring slot radiator encircling a complementary split ring resonator A tapered impedance transformer line feeds these radiating apertures and shows good impedance matching A 2 × 3 array of two-turn Complementary Spiral Resonator structure between the two antenna elements provides high dual-band isolation between them The fabricated prototype system shows two bands 234 – 247 GHz (suitable for LTE 2300) and 335 – 364 GHz (suitable for WiMAX) For spacing between two antennas of 10 mm only, the measured isolation between the two antenna elements in the lower band is around −32 dB while that in the upper band is nearly 18 dB The system shows a doughnut-shaped radiation patterns The peak measured antenna gains for the proposed MIMO system in the lower and higher bands are 39 and 42 dBi, respectively The MIMO system figure of merits such as the envelope correlation coefficient, total efficiency are also calculated and shown to provide good diversity performance

35 citations

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TL;DR: In this article, an integrated four-port multi input multi output (MIMO) system with Cylindrical Dielectric Resonator Antenna (CDRA) for CR application is investigated.
Abstract: An integrated four-port multi input multi output (MIMO) system with Cylindrical Dielectric Resonator Antenna (CDRA) for Cognitive Radio (CR) application is investigated. In this study the proposed design performs dual state operation i.e ultrawideband (UWB) and narrowband (NB) functionality with modified feeding mechanism, where the feeding line of UWB antenna is made orthogonal to NB CDRA. In UWB state the proposed integrated antenna consisting of two port circular radiators, excited by micro-strip transmission line. In NB state two CDRAs are integrated on the UWB radiators where the current density is effectively low. The DRAs are excited by aperture coupled orthogonal T feed micro-strip transmission line to perform the triband operation at targeted bands. The proposed integrated MIMO system occupies a compact total area of 0.18 λ 0 2 ( λ 0 is the highest operating wavelength) with isolation less than −15 dB among all ports. The design approach is verified by fabricating the antenna prototype and the performances are experimentally evaluated in terms of S parameter, radiation pattern and gain. Moreover, the MIMO performance metrics in terms of Envelope correlation coefficient (ECC), diversity gain (DG) and mean effective gain (MEG) are also evaluated for satisfactory diversity performance.

30 citations

Journal ArticleDOI
TL;DR: In this paper, the authors demonstrate the design and characterization of a circular patch antenna having an impedance bandwidth of 2.4-13.8 GHz with band notch at WLAN operating region.
Abstract: The present study demonstrates the designing and characterization of a circular patch antenna having an impedance bandwidth of 2.4–13.8 GHz with band notch at WLAN operating region. The small size (30 × 40 mm2) and large bandwidth (140.7% fractional band width) makes it suitable for different UWB applications. Different size reduction and matching techniques are used in this model to achieve a better response. The Quarter wave transformer matching technique is used for broad band impedance matching between the radiating circular patch and the 50 ohm source impedance. The simple design and good agreement between the simulation and the experimental results makes the design a suitable candidate for practical applications. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1068–1073, 2016

24 citations


Cited by
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2,133 citations

Journal ArticleDOI
TL;DR: The proposed dual-band eight-antenna array for multiple-input and multiple-output (MIMO) applications in 5G mobile terminals can maintain acceptable radiation and MIMO performance in the presence of specific anthropomorphic mannequin head and human hands.
Abstract: This paper proposes a dual-band eight-antenna array for multiple-input and multiple-output (MIMO) applications in 5G mobile terminals. The designed MIMO antenna array comprises eight L-shaped slot antennas based on stepped impedance resonators (SIRs). The required dual-resonance can be obtained by adjusting the impedance ratio of the SIR, and good impedance matching can be ensured for each antenna element by tuning the position of the microstrip feed line. The experimental results show that a measured return loss of higher than 10 dB and a measured inter-element isolation of greater than 11.2 dB have been obtained for each antenna element with a simulated total efficiency of larger than 51% across the long term evolution (LTE) band 42 (3400-3600 MHz) and LTE band 46 (5150-5925 MHz). In addition, the measured envelope correlation coefficient (ECC) is lower than 0.1 between arbitrary two antenna elements, and the proposed MIMO antenna array realizes a simulated channel capacity of higher than 36.9 bps/Hz within both operation bands. Furthermore, the MIMO antenna array can maintain acceptable radiation and MIMO performance in the presence of specific anthropomorphic mannequin (SAM) head and human hands.

127 citations

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TL;DR: In this paper, a closely located dual-band meander-line antenna array with isolation enhancement by inserting novel split electromagnetic bandgap (EBG) uniplanar structure is proposed.
Abstract: A closely located dual-band meander-line antenna array with isolation enhancement by inserting novel split electromagnetic bandgap (EBG) uniplanar structure is proposed. The meander-line antenna is coupled to a parasitic rectangular patch to achieve the dual-band operation. Splits are applied on the surface of an EBG structure to cause decoupling at the first resonant mode and utilizing an EBG structure to decouple at the second resonant mode. The prototype of the proposed structure achieves a dual band of 180 MHz (3.42–3.6 GHz) and 400 MHz (4.7–5.1 GHz). The mutual coupling is significantly reduced by 26 and 44 dB at 3.48 and 4.88 GHz, respectively, compared to the reference antenna. In addition, the structure has high front-to-back ratio radiation characteristics.

120 citations

Journal ArticleDOI
TL;DR: The performances of the proposed antenna by the simulation and experimentation equally designated it a blameless candidate for the UWB applications.
Abstract: In this communication, a compact two-element ultra-wideband (UWB) wearable multiple-input multiple-output (MIMO) antenna with high port isolation is presented. The proposed structure is composed of jeans material in which an `8' shaped stub is placed on the middle position of the antenna backside and connected to the partially suppressed ground structure to improve the port isolation characteristics. The antenna covers the frequency range from 2.74 to 12.33 GHz (about 127.27%) with the port isolation of >26 dB over the entire UWB frequency range. The envelope correlation co-efficient is found to be 9.9) throughout the complete operating band. The channel capacity loss for the proposed MIMO antenna is <;0.13 bit/s/Hz. The imprinted optimised UWB MIMO antenna covers the area size of 55 × 35 mm 2 . The performances of the proposed antenna by the simulation and experimentation equally designated it a blameless candidate for the UWB applications.

74 citations