An electrical equivalent circuit to simulate the output power of an AlGaAs/GaAs planar gunn diode oscillator

Cumming, David R.S.; Thomas, Dave; Maricar, Mohamed Ismaeel; Khalid, Ata; Dunn, Geoff; Greedy, Steve; Thomas, David W.P.; Cumming, David R. S.; Oxley, Chris H.

doi:10.1002/mop.31312

On Spread Spectrum for DC Grids: Low-Frequency Conducted EMI Mitigation and Signal Integrity Disruption in Serial Communication Links (2023)
Journal Article
Pena-Quintal, A., Sayed, W. E., Sumner, M., Ercan, S. U., Greedy, S., Thomas, D., & Smolenski, R. (2023). On Spread Spectrum for DC Grids: Low-Frequency Conducted EMI Mitigation and Signal Integrity Disruption in Serial Communication Links. IEEE Transactions on Electromagnetic Compatibility, 65(4), 1027-1036. https://doi.org/10.1109/TEMC.2023.3273111

This article addresses the effects on nearby communication systems when spread spectrum modulation techniques are used for a dc-dc power converter. These interactions can be found in modern smart grids and automotive power networks in which the combi... Read More about On Spread Spectrum for DC Grids: Low-Frequency Conducted EMI Mitigation and Signal Integrity Disruption in Serial Communication Links.

State of the Art of Near-Field Scanning: Contemporary Standards and Methods (2023)
Conference Proceeding
Voskresenskyi, S., Aitbar, I., Ballukja, E., Niewiadomski, K., Thomas, D. W., & Greedy, S. (2023). State of the Art of Near-Field Scanning: Contemporary Standards and Methods. In 2023 IEEE 7th Global Electromagnetic Compatibility Conference (GEMCCON) (29-30). https://doi.org/10.1109/GEMCCON57842.2023.10078194

This paper presents a review of a number of techniques used for near-field scanning and detection of electromagnetic radiation sources. It also gives an overview of standards, related to technical requirements for the devices as well as scanning meth... Read More about State of the Art of Near-Field Scanning: Contemporary Standards and Methods.

Comparison of Great Britain and Ukraine railway systems based on their EMC capability and electrification systems (2023)
Conference Proceeding
Adhena, H. H., Serdiuk, T., Thomas, D., & Greedy, S. (2023). Comparison of Great Britain and Ukraine railway systems based on their EMC capability and electrification systems. In 2023 IEEE 7th Global Electromagnetic Compatibility Conference (GEMCCon) : Merusaka Nusa Dua, Bali 19 - 20 January 2023 (35-36). https://doi.org/10.1109/GEMCCON57842.2023.10078193

In this paper, a comparison based on electromagnetic compatibility capability, electromagnetic interference susceptibility, signalling, and electrification systems of Great Britain and Ukraine's railway systems will be analyzed.

Impact of dielectric substrates on chipless RFID tag performance (2022)
Journal Article
Ali, A., Smartt, C., Im, J., Williams, O., Lester, E., & Greedy, S. (2022). Impact of dielectric substrates on chipless RFID tag performance. International Journal of Microwave and Wireless Technologies, https://doi.org/10.1017/s1759078722001039

A five-slot hexagonal shape chipless RFID tag is designed, simulated, and manufactured on FR4 substrate. The designed tag's copper geometry was replicated on a wide range of dielectric substrate to quantify the impact on resonance quality factor (RQF... Read More about Impact of dielectric substrates on chipless RFID tag performance.

Impact of Pseudo-Random Modulation on Measured Conducted EMI (2022)
Journal Article
Pena-Quintal, A., Loschi, H., Smolenski, R., Sumner, M., Thomas, D., Greedy, S., …Leferink, F. (2022). Impact of Pseudo-Random Modulation on Measured Conducted EMI. IEEE Electromagnetic Compatibility Magazine, 11(2), 84-92. https://doi.org/10.1109/memc.2022.9873829

This paper demonstrates that using conventional frequency scanning methods for the evaluation of conducted electromagnetic interference generated by DC/DC converters can give misleading results when pseudo-random modulation is used as part of the con... Read More about Impact of Pseudo-Random Modulation on Measured Conducted EMI.

EMI Spectral Aggregation of Modulation Schemes in a lab-based DC Microgrid (2022)
Conference Proceeding
Pena-Quintal, A., Khilnani, A., Sandrolini, L., Sumner, M., Thomas, D., & Greedy, S. (2022). EMI Spectral Aggregation of Modulation Schemes in a lab-based DC Microgrid. In 2022 IEEE International Symposium on Electromagnetic Compatibility & Signal/Power Integrity (EMCSI) (226-231). https://doi.org/10.1109/emcsi39492.2022.9889337

DC Microgrid research has developed in the recent years following the increasing integration of power electronic based switching devices at the point of common coupling in DC grids. This has led to electromagnetic interference problems caused by the... Read More about EMI Spectral Aggregation of Modulation Schemes in a lab-based DC Microgrid.

High capacity chipless RFID tags for biomass tracking application (2022)
Journal Article
Ali, A., Smartt, C., Lester, E., Williams, O., & Greedy, S. (2023). High capacity chipless RFID tags for biomass tracking application. International Journal of Microwave and Wireless Technologies, 15(5), 742-752. https://doi.org/10.1017/S1759078722000745

The design of a low-cost, flexible, miniaturized and a high code density chipless RFID tag is presented as a solution for tracking the transportation of biomass fuel pellets. The performance of the tag is presented and demonstrates the applicability... Read More about High capacity chipless RFID tags for biomass tracking application.

High capacity chipless RFID tags for biomass tracking application (2022)
Journal Article
Ali, A., Smartt, C., Lester, E., Williams, O., & Greedy, S. (2023). High capacity chipless RFID tags for biomass tracking application. International Journal of Microwave and Wireless Technologies, 15(5), 742-752. https://doi.org/10.1017/s1759078722000745

The design of a low-cost, flexible, miniaturized, and a high code density chipless radio-frequency identification (RFID) tag is presented as a solution for tracking the transportation of biomass fuel pellets. The performance of the tag is presented a... Read More about High capacity chipless RFID tags for biomass tracking application.

High Code Density and Humidity Sensor Chipless RFID Tag (2022)
Presentation / Conference
Ali, A., Williams, O., Lester, E., & Greedy, S. (2022, July). High Code Density and Humidity Sensor Chipless RFID Tag. Paper presented at 2022 7th International Conference on Smart and Sustainable Technologies, SpliTech 2022, Split / Bol, Croatia

This article presents a low cost, miniaturize, flexible, high code density chipless sensor tag. The tag is designed on polyethylene terephthalate (PET) substrate with a compact size of 1cm radius operating in ultra-wideband, ranging from 3.5 to 16GHz... Read More about High Code Density and Humidity Sensor Chipless RFID Tag.

Reconfigurable Intelligent Surface-Assisted Bluetooth Low Energy Link in Metal Enclosure (2021)
Journal Article
Lodro, M., Gradoni, G., Gros, J., Greedy, S., & Lerosey, G. (2021). Reconfigurable Intelligent Surface-Assisted Bluetooth Low Energy Link in Metal Enclosure. Frontiers in Communications and Networks, 2, Article 733637. https://doi.org/10.3389/frcmn.2021.733637

Reconfigurable intelligent surface (RIS) technology is at the forefront for its transformative role in future wireless communication systems such as wireless local area networks (WLAN), sixth-generation (6G) communication, and internet-of-things (IoT... Read More about Reconfigurable Intelligent Surface-Assisted Bluetooth Low Energy Link in Metal Enclosure.

The Effect of Spread Spectrum Modulation for a Buck Converter Coupled with a Single Wired Communication Link (2021)
Conference Proceeding
Pena-Quintal, A., Niewiadomski, K., Muneeswaran, V., Greedy, S., Sumner, M., & Thomas, D. (2021). The Effect of Spread Spectrum Modulation for a Buck Converter Coupled with a Single Wired Communication Link. In EMC/SI/PI and EMC Europe Symposium, IEEE International Joint (445-450). https://doi.org/10.1109/EMC/SI/PI/EMCEurope52599.2021.9559276

This paper explores the effect of using a Spread Spectrum modulation technique with a Buck Converter on a communication cable coupled at the input voltage. The EMI created by the switching of the power converter generates damped oscillations on the d... Read More about The Effect of Spread Spectrum Modulation for a Buck Converter Coupled with a Single Wired Communication Link.

Real-Time Thermal Imaging Using Augmented Reality and Accelerated 3D Models (2020)
Conference Proceeding
Jalal, B., Greedy, S., & Evans, P. (2020). Real-Time Thermal Imaging Using Augmented Reality and Accelerated 3D Models. . https://doi.org/10.1109/compel49091.2020.9265658

We present an innovative method to allow real-time visualisation of temperature fields on power electronic circuits using augmented reality. A real-time time-domain simulation incorporating the Block Arnoldi model order reduction techniques is implem... Read More about Real-Time Thermal Imaging Using Augmented Reality and Accelerated 3D Models.

An Open Source, FPGA-Based Bit Error Ratio Tester for Serial Communications (2020)
Conference Proceeding
Basford, M. J., Pena-Quintal, A. E., Greedy, S., Sumner, M., & Thomas, D. W. P. (2020). An Open Source, FPGA-Based Bit Error Ratio Tester for Serial Communications. In Proceedings of 2020 International Symposium on Electromagnetic Compatibility - EMC EUROPE. https://doi.org/10.1109/emceurope48519.2020.9245786

This paper discusses the design of a FPGA-based Bit Error Ratio (BER) measurement system in a serial communication link under electromagnetic emissions. The BER measurement is an important figure for the reliability of digital communication systems.... Read More about An Open Source, FPGA-Based Bit Error Ratio Tester for Serial Communications.

Data Links Modelling under Radiated EMI and its Impact on Sampling Errors in the Physical Layer (2020)
Conference Proceeding
Pena-Quintal, A. E., Basford, M. J., Niewiadomski, K., Greedy, S., Sumner, M., & Thomas, D. W. P. (2020). Data Links Modelling under Radiated EMI and its Impact on Sampling Errors in the Physical Layer. In Proceedings of 2020 International Symposium on Electromagnetic Compatibility - EMC EUROPE. https://doi.org/10.1109/emceurope48519.2020.9245670

This paper deals with the effects of radiated EMI on serial communication links using software modelling with particular emphasis on the physical layer. The effect of EMI in data links is an important problem to solve in many harsh environments such... Read More about Data Links Modelling under Radiated EMI and its Impact on Sampling Errors in the Physical Layer.

A Passive RFID Tag For Biomass Tracking (2020)
Conference Proceeding
Ali, A., Mackenzie, R., Lester, E., Williams, O., & Greedy, S. (2020). A Passive RFID Tag For Biomass Tracking. In 14th European Conference on Antennas and Propagation, EuCAP 2020. https://doi.org/10.23919/EuCAP48036.2020.9135560

© 2020 EurAAP. This paper presents the design for a low cost miniaturized chipless RFID tag for short-range biomass tracking and monitoring purposes. The concentric hexagonal geometry and angular stability, leading to higher data capacity are the nov... Read More about A Passive RFID Tag For Biomass Tracking.

The use of free-space microwave non-destructive techniques: simulation of damage detection in carbon fibre reinforced composites (2019)
Conference Proceeding
Munalli, D., Dimitrakis, G., Chronopoulos, D., Greedy, S., & Long, A. (2019). The use of free-space microwave non-destructive techniques: simulation of damage detection in carbon fibre reinforced composites

Microwave non-destructive testing (MNDT) methods represent an effective solution in detecting defects within composite structures with relatively low electrical conductivity. They offer the advantage to overcome the problems of traditional NDT techni... Read More about The use of free-space microwave non-destructive techniques: simulation of damage detection in carbon fibre reinforced composites.

Latest developments on the shielding effectiveness measurements of materials and gaskets in reverberation chambers (2019)
Journal Article
Gifuni, A., Gradoni, G., Smartt, C., Greedy, S., Villalón, A. M., Bastianelli, L., …Thomas, D. (2019). Latest developments on the shielding effectiveness measurements of materials and gaskets in reverberation chambers. IET Science Measurement and Technology, 14(4), 435-445. https://doi.org/10.1049/iet-smt.2019.0242

In this study, the authors present the latest developments on the measurements for the shielding effectiveness (SE) of gaskets and materials in reverberation chambers (RCs). A variant method, where the insertion loss of the fixture is achieved from t... Read More about Latest developments on the shielding effectiveness measurements of materials and gaskets in reverberation chambers.

Using Deep Machine Learning to Understand the Physical Performance Bottlenecks in Novel Thin‐Film Solar Cells (2019)
Journal Article
Majeed, N., Saladina, M., Krompiec, M., Greedy, S., Deibel, C., & Mackenzie, R. C. I. (2020). Using Deep Machine Learning to Understand the Physical Performance Bottlenecks in Novel Thin‐Film Solar Cells. Advanced Functional Materials, 30(7), Article 1907259. https://doi.org/10.1002/adfm.201907259

There is currently a worldwide effort to develop novel materials for solar energy harvesting which are efficient, low cost and do not emit significant levels of CO 2 during manufacture. Currently when a researcher fabricates a novel device from a nov... Read More about Using Deep Machine Learning to Understand the Physical Performance Bottlenecks in Novel Thin‐Film Solar Cells.

Electromagnetic shielding effectiveness of carbon fibre reinforced composites (2019)
Journal Article
Munalli, D., Dimitrakis, G., Chronopoulos, D., Greedy, S., & Long, A. (2019). Electromagnetic shielding effectiveness of carbon fibre reinforced composites. Composites Part B: Engineering, 173, Article 106906. https://doi.org/10.1016/j.compositesb.2019.106906

This paper reports results on the shielding effectiveness parameter of laminated epoxy composites with carbon fibre reinforcements. Measurements of shielding effectiveness were carried out with a coaxial transmission line testing chamber according to... Read More about Electromagnetic shielding effectiveness of carbon fibre reinforced composites.

An electrical equivalent circuit to simulate the output power of an AlGaAs/GaAs planar gunn diode oscillator (2018)
Journal Article
Cumming, D. R., Thomas, D., Maricar, M. I., Khalid, A., Dunn, G., Greedy, S., …Oxley, C. H. (2018). An electrical equivalent circuit to simulate the output power of an AlGaAs/GaAs planar gunn diode oscillator. Microwave and Optical Technology Letters, 60(9), 2144-2148. https://doi.org/10.1002/mop.31312

© 2018 Wiley Periodicals, Inc. The planar Gunn diode offers the potential of microwave, milli-metric and THz-based oscillators, which can be fabricated as part of a microwave monolithic integrated circuit (mmic). The paper develops an electrical repr... Read More about An electrical equivalent circuit to simulate the output power of an AlGaAs/GaAs planar gunn diode oscillator.

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