Division of Electromagnetics and Nanoelectronics (EMN)’s Post

🚀 New paper published in the journal #Telecom (IF: 2.1, Citescore: 4.8) 🖋️ Title: Measurement of Dielectric Properties of Thin Materials for #Radomes Using Waveguide Cavities 🔗 Paper can be viewed and downloaded via the link below: https://lnkd.in/erBzp4Gr #electromagnetics #wave #dielectrics

Publication: 𝗢𝘂𝘁𝗽𝘂𝘁 𝗰𝗵𝗮𝗿𝗮𝗰𝘁𝗲𝗿𝗶𝘀𝘁𝗶𝗰𝘀 𝗼𝗳 𝗽𝗮𝘀𝘀𝗶𝘃𝗲 𝗺𝗮𝗴𝗻𝗲𝘁𝗶𝗰 𝗲𝗻𝗲𝗿𝗴𝘆 𝗵𝗮𝗿𝘃𝗲𝘀𝘁𝗲𝗿 𝗳𝗲𝗲𝗱𝗶𝗻𝗴 𝗮 𝗰𝗼𝗻𝘀𝘁𝗮𝗻𝘁-𝘃𝗼𝗹𝘁𝗮𝗴𝗲-𝘁𝘆𝗽𝗲 𝗹𝗼𝗮𝗱 This paper provides a methodology for deriving a family of output characteristics (DC-side I-V and P-V curves) for a passive magnetic energy harvester (MEH) clamped on a sinusoidal current-carrying conductor. It is demonstrated that MEH characteristics depend on primary current magnitude and frequency as well on load voltage. First, expressions for power harvested by a MEH are derived employing nonlinear B-H curve approximation of the core. Then, conversion losses are assessed to provide respective estimates for the power provided by the MEH to the load. Presented analytical findings are accurately supported by experimental results of MEH designed to harvest up to 240W from a conductor carrying currents of up to 350A. 𝗔𝘂𝘁𝗵𝗼𝗿𝘀: Alexander Abramovitz, Moshe Shvartsas, Georgios Orfanoudakis, Alon Kuperman 𝗣𝘂𝗯𝗹𝗶𝘀𝗵𝗲𝗱 𝗶𝗻: IEEE Journal of Emerging and Selected Topics in Power Electronics, vol. TBD, no. TBD, pp. TBD, 2024. 𝗥𝗲𝗮𝗱 𝗺𝗼𝗿𝗲: https://lnkd.in/dGwaZZhn

On-Demand Video: Band Gap Analysis of Semiconductors through UV-Visible Techniques 📹 Analysis of the electronic structure of semiconducting materials can reveal key data about photo-induced processes within the material, like photocatalysis or solar energy conversion 🌞. A semiconductor’s performance is strongly dependent on its band gap energy, or the amount of energy needed to promote electrons from the valence band to the conduction band ⚡. UV-Visible spectroscopy can be instrumental in the study of the bands of electronic states in these materials 🔬. This video will provide you with useful, relevant information: ✅ Gain knowledge about the theory and application of Tauc plot analyses for both reflectance and transmittance measurements 📊 ✅ Learn what sample properties and environmental factors can influence the measured spectra of a semiconducting sample 🧪 ✅ Understand the considerations needed to perform accurate UV-Visible measurements of films or colloidal solutions 💡 Visit this link to watch 👉👉👉 https://rb.gy/4zomey #SemiconductorAnalysis #UVVisibleSpectroscopy #BandGapEnergy #MaterialsScience #Photocatalysis #SolarEnergyConversion #TaucPlotAnalysis #Spectroscopy #MaterialsCharacterization #Nanotechnology #WebChanges #AnatechWebChanges #Anatech

Publication: 𝗘𝗻𝗵𝗮𝗻𝗰𝗲𝗱 𝗺𝗮𝘅𝗶𝗺𝘂𝗺 𝗽𝗼𝘄𝗲𝗿 𝗽𝗼𝗶𝗻𝘁 𝗿𝗲𝗮𝗰𝗵𝗶𝗻𝗴 𝗺𝗲𝘁𝗵𝗼𝗱 𝗳𝗼𝗿 𝗽𝗮𝘀𝘀𝗶𝘃𝗲 𝗺𝗮𝗴𝗻𝗲𝘁𝗶𝗰 𝗲𝗻𝗲𝗿𝗴𝘆 𝗵𝗮𝗿𝘃𝗲𝘀𝘁𝗲𝗿𝘀 𝗼𝗽𝗲𝗿𝗮𝘁𝗶𝗻𝗴 𝘂𝗻𝗱𝗲𝗿 𝗹𝗼𝘄 𝗽𝗿𝗶𝗺𝗮𝗿𝘆 𝗰𝘂𝗿𝗿𝗲𝗻𝘁𝘀 The letter concerns a clamped-type passive magnetic energy harvester (MEH), supplying power to a general load via a diode bridge rectifier (DBR). It is known that a certain value of output MEH voltage (referred to as optimal) maximizes harvested power. Under high primary current magnitudes, the optimal voltage value is constant, i.e., current-independent. Consequently, it was recently proposed to interface a passive MEH to a general load via a switching power converter whose input (i.e., MEH-side) voltage is regulated to a corresponding constant voltage reference, realizing the maximum power point reaching (MPPR) method. However, optimal voltage value becomes current-dependent under low primary current magnitudes. As a result, the power harvested by MPPR-operated MEH becomes suboptimal if the MEH-side voltage reference of the converter remains unchanged. Hence, the brief suggests allowing the converter input voltage reference value to be adjusted (by, e.g., a maximum power point tracking loop) to maximize harvested MEH power under low primary currents as well. Experimental results comparing the harvested power of a passive MEH under classical and enhanced MPPR methods validate the proposed enhancement. 𝗔𝘂𝘁𝗵𝗼𝗿𝘀: Alexander Abramovitz, Moshe Shvartsas, Alon Kuperman 𝗣𝘂𝗯𝗹𝗶𝘀𝗵𝗲𝗱 𝗶𝗻: IEEE Transactions on Power Electronics, vol. 39, no. 6, pp. 6619 – 6623, Jun. 2024. 𝗥𝗲𝗮𝗱 𝗺𝗼𝗿𝗲: https://lnkd.in/dZzgJPUW

Check this out if you are interested in: Power scaling to 300 W with adjustable pulse energy and repetition rate (from 100 kHz, 3 mJ to 25 kHz, 12 mJ). Compression of 1.3 ps pulses down to 100 fs in a single HCF. 80 W, 2 mJ, 338 fs pulses at 1030 nm compressed to sub-two optical cycles (6 fs FWHM). Simultaneous outputs spanning a wavelength range from 430 nm to 12 μm utilizing the ultra-broadband HCF output. Light Conversion few-cycle AMPHOS GmbH https://lnkd.in/eN7FH6Hn

I am excited to share that our article “Conditional Sixth Harmonic Injection to Improve the Linear Modulation Range of 3 Phase Voltage Source Inverter,” has been featured in the IEEE Power Electronics Letters (December 2024 edition). In this work, we address how the linear modulation range can be extended beyond 15.5% with conventional methods. We propose a novel approach by conditionally injecting a sixth harmonic signal alongside a combination of third and ninth harmonic signals. This method theoretically enhances the linear modulation range up to 19.2% while maintaining a THD below 3% in the line-to-line voltage. For a detailed discussion, you can access the article here: https://lnkd.in/eiJmVSkk Please feel free to reach out in case you have any suggestions.

I'm thrilled to share that my paper, "Power Handling Considerations of Narrow-band Second-order Absorptive and Reflective Bandstop Filters," has been published in the IEEE Transactions on Microwave Theory and Techniques (TMTT), one of the leading journals in the field of microwave engineering! This paper encapsulates the final chapter of my Ph.D. dissertation, and its publication nearly three years after my defense is a testament to commitment, dedication, perseverance, and resilience. I would like to extend my deepest gratitude to my co-authors and Prof. Dimitrios Peroulis for their unwavering support and encouragement throughout this journey. This paper presents a novel comparative analysis of the power handling capability (PHC) between an absorptive bandstop filter and a reflective bandstop filter, which has not been explored previously. I'd like to invite you to explore the publication on IEEE Xplore. Here’s the link: https://lnkd.in/gJXi744r I look forward to continuing my contributions to the advancement of RF/microwave engineering! #RF #MicrowaveEngineering #Research #IEEE Transactions on Microwave Theory and Techniques #Gratitude #Published #PowerHandling #IEEETMTT

𝗢𝗰𝘁𝗮𝘃𝗲-𝗦𝗽𝗮𝗻𝗻𝗶𝗻𝗴 𝗦𝘂𝗽𝗲𝗿𝗰𝗼𝗻𝘁𝗶𝗻𝘂𝘂𝗺 𝗚𝗲𝗻𝗲𝗿𝗮𝘁𝗶𝗼𝗻 𝗶𝗻 𝗔𝗹𝗚𝗮𝗔𝘀-𝗼𝗻-𝗜𝗻𝘀𝘂𝗹𝗮𝘁𝗼𝗿 𝗪𝗮𝘃𝗲𝗴𝘂𝗶𝗱𝗲𝘀 AlGaAs-on-insulator waveguides enable broad supercontinuum generation with minimal energy input. 𝗪𝗵𝘆 𝗱𝗼𝗲𝘀 𝘁𝗵𝗶𝘀 𝗺𝗮𝘁𝘁𝗲𝗿? Efficient supercontinuum generation on-chip paves the way for advanced optical communication, spectroscopy, and metrology applications, enhancing performance and scalability. 𝗞𝗲𝘆 𝗣𝗼𝗶𝗻𝘁𝘀 ‣ AlGaAs-on-insulator waveguides utilize high χ(2) and χ(3) nonlinearities for broad SC generation with low power requirements (University of Tokyo). ‣ A bandwidth spanning more than 1.2 octaves (881 nm to 2149 nm) was achieved with only 12.0 pJ of on-chip pump pulse energy (University of Tokyo study). ‣ The waveguide design includes advanced dispersion management and optical coupling techniques to ensure efficient SC generation (University of Tokyo research). Read the full article on our website: https://lnkd.in/g-hKebfz #LatitudeDesignSystems #AlGaAs #NonlinearOptics #Waveguide #OpticalCommunications #Spectroscopy

It's online on IEEE TIM - my last paper with the SQEL group of CNR-NANO on the "Estimation of the FR4 Microwave Dielectric Properties at Cryogenic Temperature for Quantum-Chip-Interface PCBs Design". In this work, we report on an effective way to evaluate the dielectric performance of the PCBWay PCBWay Europe FR4 laminate used as a substrate for cryogenic microwave PCBs. We estimated a 9% reduction of the real permittivity and a 70% reduction of the loss tangent in the temperature range from 300 K to 4 K, which can be included into in-future designs to boost electrical performance of cryogenic PCBs. https://lnkd.in/dcJ-URda

📢📝 📰 We're very proud to announce that our latest work on variable inductors, entitled "Analysis and Validation of a Novel Symmetrical Structure for Toroidal Variable Power Inductors in Energy Storage Systems" has been published in IEEE Journal of Emerging and Selected Topics in Power Electronics (vol. 12, no. 6, pp. 5915-5929, Dec. 2024). https://lnkd.in/duEXeUy3 🎉 🎉 I want to express my gratitude to the main author of this work, Prof. Sarah Saeed Hazkial Gerges. This work has been developed within the research group Lemur Research Group at the Universidad de Oviedo.  The article presents an analysis of an alternative variable inductor structure compared to the ones previously proposed in the literature. The inductor is constructed based on a toroidal core and presents some prosperous advantages, which are a reduced induced voltage in the dc bias control windings and a symmetrical operation while making use of the simplicity of a toroidal magnetic core. The proposed topology is applied to a specific case study: the design and implementation of a bidirectional boost converter for integration of battery energy storage systems into DC grids. The variation of the inductance in this application provides an extra degree of freedom in the design, which offers twofold improvement to the controlled system. On the one hand, it allows the system to keep the same impedance throughout the operation range. This guarantees that the behavior of the controlled system will remain the same and avoids the need to change the controller tuning and parameters each time the State of Charge of the battery varies. Also, on the other hand, it enables control over the voltage and current ripple through the battery without the need to install extra capacitor banks. The design, assessment, and experimental procedures of the proposed Variable Inductor structure for this application case are shown in this article. The results show an improvement in the performance of the selected case study.