Energy Harvesting in Wireless Networks

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This paper presents an analytical projection method for calculating mutual inductance between arbitrarily aligned circular coils in wireless power transfer (WPT) systems. Numerical flux calculations are performed using a novel methodology, taking the wire diameter into account to avoid any mathematical singularity and…

Multi-hop amplify-and-forward (AF) relaying inherently amplifies and propagates noise along with the desired signal, leading to an accumulation of noise power over successive hops. At the receiver, an optimal detector is desirable but challenging to realize for non-Gaussian or unknown source distributions (e.g., video…

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Radial line slot array (RLSA) antennas are widely used for near-field focusing, yet the impact of ring count on matching and focal quality remains unquantified. This study systematically varies the number of concentric slot rings from 1 to 10 in a near-field focusing RLSA, using a validated full-wave finite element me…

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In this study, an optimized Litz wire and polyphase coil winding design is proposed for high-power wireless charging systems operating at 85 kHz frequency. Litz wire in a wireless charging system contributes to more than half of the losses of the system, making it a critical design component. Here, the Litz wire is op…

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Circular Antenna Arrays (CAAs) play a pivotal role in modern wireless communication systems due to their versatile beam-scanning capabilities. However, synthesizing these arrays to achieve suppressed Side Lobe Levels (SLL) and narrow Half Power Beam Widths (HPBW) remains a complex optimization challenge essential for…

This article presents the experimental characterization of a 3D-printed conformal 2×1 microstrip array antenna designed for 2.4 GHz WiFi backscatter applications in indoor IoT scenarios. Starting from a planar configuration, three conformal states (30∘, 60∘, and 90∘) were realized to systematically evaluate the effect…

Terahertz (THz) unmanned aerial vehicle (UAV)-to-UAV communication offers multi-gigabit-per-second throughput through large available bandwidths, but requires highly directional beams to overcome severe path loss and atmospheric attenuation at these frequencies. On the other hand, the rapid and irregular mobility of U…

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