Showing papers by "Shiban K. Koul published in 2023"
DOI•
01 Jan 2023
TL;DR: In this article , a dual-band rectifier is presented for RF energy harvesting (RFEH) and microwave power transfer (MPT) applications, where the rectifier simultaneously harvests the RF energy with power conversion efficiency (PCE) of 54.9% and 42.3% and output voltage of 1.4 and 1.242 V at 0-dBm input power for 3.5GHz 5G band and 5.8-GHz Wi-Fi band, respectively.
Abstract: A dual-band rectifier is presented for RF energy harvesting (RFEH) and microwave power transfer (MPT) applications. Starting with a single-band rectifier, the second band is added by utilizing a half-wavelength transmission line (HWTL) in the matching network (MN). A series diode topology using HSMS-2860 Schottky diode is used for power conversion. The rectifier simultaneously harvests the RF energy with power conversion efficiency (PCE) of 54.9% and 42.3% and output voltage of 1.4 and 1.242 V at 0-dBm input power for 3.5-GHz 5G band and 5.8-GHz Wi-Fi band, respectively.
6 citations
DOI•
TL;DR: In this article , the diversity order (DO) and the diversity measure (DM) of multiple-input multiple-output (MIMO) antennas in generic single-user, multiuser and massive MIMO wireless communications are calculated for several practical case studies.
Abstract: In this letter, the diversity order (DO) and the diversity measure (DM) of multiple-input multiple-output (MIMO) antennas in generic single-user, multiuser, and massive MIMO wireless communications are calculated for several practical case studies. These performance metrics are calculated from the antenna correlation coefficient (ACC) matrix. The DO is calculated from the rank of the ACC matrix, and the DM is obtained from the trace and Frobenius norm of the ACC matrix. Numerical results are provided. In particular, it is shown that though the DM is always less than the DO, it incorporates the effect of antenna correlation on the diversity gain in a better way.
1 citations
TL;DR: In this paper , the vital signs of a human subject are estimated at V-band using the off-body link of the body area network (BAN), where the central node of BAN is mounted on the chest of the subject and due to the periodic motion of the chest, the received signal contains the vital sign information.
Abstract: In this paper, the vital signs of a human subject are estimated at V-Band using the off-body link of the body area network (BAN). The central node of BAN is mounted on the chest of the subject and due to the periodic motion of the chest, the received signal contains the vital sign information. The vital sign information is extracted from the received data. To validate the concept, measurements are performed at 60 GHz using a network analyzer. The antenna is mounted on the body and the respiration rate is successfully extracted from the measurements. Thus, the off-body link of a BAN can be used for vital sign monitoring for health and recreational purposes.
TL;DR: In this paper , a wideband transition from a microstrip transmission line to a spoof surface plasmon polariton (SSPP) transmission line is reported to achieve better performance starting from low frequencies up to 40 GHz.
Abstract: In this article, a wideband transition from a microstrip transmission line to a microstrip spoof surface plasmon polariton (SSPP) transmission line is reported. The proposed transition is realized to achieve better performance starting from low frequencies up to 40 GHz. The proposed shape of the unit cell is taken in such a manner that the momentum, impedance, and polarization of the microstrip line can be matched with that of the SSPP transmission line. The wide operating band of the transition can be achieved by perturbing only the shape of the unit cell. Extra care is taken in choosing the shape of the unit cell so that the fabrication of the circuit becomes easier, especially at millimeter-wave frequencies. The proposed transition has a good transition-occupation ratio and transmission efficiency. The achieved transition-occupation ratio and transition efficiency for all three designed cases are excellent, and it is 34.18%, 44%, and 39% for
p
=
1
mm, 2 mm, and 3 mm, respectively. It is a potential candidate for realizing millimeter-wave antennas and devices due to its attractive properties, such as compact layout, low fabrication cost, ease of fabrication even at millimeter-wave frequencies, and good operational characteristics.
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TL;DR: In this article , an optimization method for maximizing the power production of wind farms under practical conditions such as varying wind direction and turbine failures is presented, which is compared with the prior art to establish the efficacy of the proposed method.
Abstract: The next paper on “Model-Free Wind Farm Power ProductionOptimization usingMulti-ResolutionOptimized Relative Step Size Random Search” presents a study of an optimization method for maximizing the power production of wind farms under practical conditions such varying wind direction and turbine failures. The performance of the method is compared with the prior art to establish the efficacy of the proposed method.
DOI•
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TL;DR: In this article , a comparison of heuristic approaches in weight optimization of different power levels transformers and power transformers is presented, where the goal is to lower the cost of the transformer, make it last longer, and make it more efficient by getting the best numbers for the current density (s) and iron section (C), which are the variables used to figure out the transformer's weight.
Abstract: In the first paper of the issue, titled “Comparison of Heuristic Approaches in Weight Optimization of Different Power Levels Transformer,” the weight of widely used distribution type transformers and power transformers is optimised. The Firefly algorithm, the Ant Colony algorithm, and the Bee algorithm are used in an heuristic way to figure out the weight of transformers. Optimization of the iron weight components that have the most effect on the weight of a transformer made in more than one type is given. The goal is to lower the cost of the transformer, make it last longer, and make it more efficient by getting the best numbers for the current density (s) and iron section (C), which are the variables used to figure out the ironweight of the transformer.Heuristic optimisation techniques outperformed standard methods in the study. Heuristic optimisation yields the best weights for 50 kVA and 1000 kVA transformers, enabling lower transformer designs.
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TL;DR: In this paper , a two-step gene selection method was used to filter out noisy and redundant genes using Modified Binary Particle Swarm Optimization (MPSO) and T-statistic (T-test), Signal-to-Noise Ratio (SNR), and F-test are utilized in the initial phase of gene selection.
Abstract: In the first paper titled “Feature Selection for Alzheimer’s Gene Expression Data Using Modified Binary Particle Swarm Optimization,” a statistical method and heuristic optimization approach are used to implement a new two-step gene selection to filter out noisy and redundant genes. T-statistic (T-test), Signal-to-Noise Ratio (SNR), and F-test are utilized in the initial phase of gene selection. Particle SwarmOptimization (PSO) is used to determine the ideal number of Alzheimer’s disease features using the 10most significant genes identified using statistical approaches. This study identified EGR1, CKMT1B, RPL15, PSMB3,GRK4, COX6A1, and PHIP as important genes from the GSE5281 dataset.