Dr STEVE GREEDY's Outputs (41)

The use of free-space microwave non-destructive techniques: simulation of damage detection in carbon fibre reinforced composites (2019)
Presentation / Conference Contribution
Munalli, D., Dimitrakis, G., Chronopoulos, D., Greedy, S., & Long, A. (2019, November). The use of free-space microwave non-destructive techniques: simulation of damage detection in carbon fibre reinforced composites. Presented at 11th Symposium on NDT in Aerospace, Paris, France

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., Moglie, F., Mariani Primiani, V., Perna, S., & 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., Thomas, D. W., Cumming, D. R. 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.

Electromagnetic shielding effectiveness of fiber-reinforced composites: a preliminary study (2018)
Presentation / Conference Contribution
Munalli, D., Chronopoulos, D., & Greedy, S. Electromagnetic shielding effectiveness of fiber-reinforced composites: a preliminary study. Presented at 9th European Workshop on Structural Health Monitoring

The use of Low power Radio Frequency (RF) based techniques as Non Destructive Testing (NDT) methods offers a potential solution for detecting defects and anomalies occurring in the structural integrity of composite based structures in real time, enab... Read More about Electromagnetic shielding effectiveness of fiber-reinforced composites: a preliminary study.

EMC-oriented multi-conductor equivalent circuit cable models for spice, including transfer impedance coupling and incident field excitation (2017)
Presentation / Conference Contribution
Smartt, C., Basford, M., Greedy, S., Thomas, D., & Sumner, M. (2017, September). EMC-oriented multi-conductor equivalent circuit cable models for spice, including transfer impedance coupling and incident field excitation. Presented at 2017 International Conference on Electromagnetics in Advanced Applications (ICEAA), Verona, Italy

This paper describes the development and application of sophisticated multi-conductor cable bundle models for Spice simulation. The cable models developed include frequency dependent parameters, transfer impedance coupling and incident plane wave exc... Read More about EMC-oriented multi-conductor equivalent circuit cable models for spice, including transfer impedance coupling and incident field excitation.

Throughput analysis of full-duplex communication cognitive radio network (2017)
Journal Article
Lodro, M. M., Greedy, S., Mahoto, N. A., & Unar, M. A. (2017). Throughput analysis of full-duplex communication cognitive radio network. Wireless Personal Communications, 97(2), https://doi.org/10.1007/s11277-017-4662-9

In this paper we deal with the throughput of full-duplex cognitive communication radio which exploits unused band of primary user (PU) network. Classical cognitive radio uses half-duplex communication spectrum sensing to perform spectrum sensing and... Read More about Throughput analysis of full-duplex communication cognitive radio network.

Design and characterization of a diamond-shaped monopole antenna (2017)
Journal Article
Maricar, M. I., Bahar, A., Greedy, S., Smartt, C., Phang, S., Gradoni, G., Cross, R., Creagh, S. C., Tanner, G., & Thomas, D. W. P. (2017). Design and characterization of a diamond-shaped monopole antenna. Microwave and Optical Technology Letters, 59(10), 2695-2698. https://doi.org/10.1002/mop.30790

We report a new planar antenna design in the shape of a diamond. The performance of the antenna design is initially obtained through simulation, then fabricated, and its performance evaluated through experiment. Experimental characterization of the d... Read More about Design and characterization of a diamond-shaped monopole antenna.

Analysis of conducted emissions from an Electric Nacelle Anti-Ice power control system (2016)
Presentation / Conference Contribution
Nothofer, A., Tarisciotti, L., Zhou, Q., Benson, T. M., Greedy, S., & Christopoulos, C. (2016, September). Analysis of conducted emissions from an Electric Nacelle Anti-Ice power control system. Presented at EMC Europe 2016

In this paper a high frequency model of the Electrical Nacelle Anti-Ice (ENAI) system is described for a typical aircraft application. The ENAI system, usually modelled only at the normal operating frequency, is modified in order to include a detaile... Read More about Analysis of conducted emissions from an Electric Nacelle Anti-Ice power control system.

3D inkjet-printed UV-curable inks for multi-functional electromagnetic applications (2016)
Journal Article
Saleh, E., Woolliams, P., Clarke, B., Gregory, A., Greedy, S., Smartt, C., Wildman, R. D., Ashcroft, I., Hague, R. J., Dickens, P., & Tuck, C. (2017). 3D inkjet-printed UV-curable inks for multi-functional electromagnetic applications. Additive Manufacturing, 13, 143-148. https://doi.org/10.1016/j.addma.2016.10.002

Inkjet printing of multiple materials is usually processed in multiple steps due to various jetting and curing/sintering conditions. In this paper we report on the development of all inkjet-printed UV-curable electromagnetic responsive inks in a sing... Read More about 3D inkjet-printed UV-curable inks for multi-functional electromagnetic applications.

Time domain measurement of near field emissions from complex PCBs (2016)
Presentation / Conference Contribution
Thomas, D., Greedy, S., Smartt, C., Nasser, H., Baharuddin, M., Gradoni, G., Creagh, S., & Tanner, G. (2016, October). Time domain measurement of near field emissions from complex PCBs. Presented at 46th European Microwave Conference, London, UK

This paper discusses how the measurements of the near-field emissions in the time domain can be used to characterize the broadband emissions from complex sources such as multifunctional Printed Circuit Boards (PCBs). The near- fields, transverse to t... Read More about Time domain measurement of near field emissions from complex PCBs.

Conducted emission evaluation for direct matrix converters (2016)
Presentation / Conference Contribution
Nothofer, A., Tarisciotti, L., Greedy, S., Empringham, L., De Lillo, L., & Degano, M. Conducted emission evaluation for direct matrix converters. Presented at 2016 ESA Workshop on Aerospace EMC

Matrix converters have been recently proposed as an alternative solution to the standard back-to-back converter in aerospace applications. However, Electromagnetic Interference (EMI), in particular, conducted emissions represent a critical aspect for... Read More about Conducted emission evaluation for direct matrix converters.

Open source cable models for EMI simulations (2016)
Presentation / Conference Contribution
Greedy, S., Smartt, C., & Thomas, D. W. (2016, May). Open source cable models for EMI simulations. Presented at 2016 ESA Workshop on Aerospace EMC, Valencia, Spain

This paper describes the progress of work towards an Open Source software toolset suitable for developing Spice based multi-conductor cable models. The issues related to creating a transmission line model for implementation in Spice which include the... Read More about Open source cable models for EMI simulations.

Loss mechanisms in high efficiency polymer solar cells (2015)
Journal Article
MacKenzie, R. C. I., Balderrama, V. S., Schmeisser, S., Stoof, R., Greedy, S., Pallarès, J., Marsal, L. F., Chanaewa, A., & von Hauff, E. (2016). Loss mechanisms in high efficiency polymer solar cells. Advanced Energy Materials, 6(4), 1-7. https://doi.org/10.1002/aenm.201501742

Performance losses and aging mechanisms are investigated in state‐of‐the‐art PTB7:PC70BM solar cells. Inverted devices incorporating a vanadium pentoxide (V2O5) top contact have efficiencies of 8%. After aging the unencapsulated devices, no changes a... Read More about Loss mechanisms in high efficiency polymer solar cells.

Characterisation of radiated fields from PCBs in the time domain (2015)
Presentation / Conference Contribution
Thomas, D., Smartt, C., & Greedy, S. (2015, August). Characterisation of radiated fields from PCBs in the time domain. Presented at 2015 IEEE International Symposium on Electromagnetic Compatibility (EMC), Dresden, Germany

In this paper, a method for representing electromagnetic emissions from a printed circuit board (PCB) using an equivalent dipole model deduced from time domain near-field scanning magnetic field measurements is proposed. The basic idea is to replace... Read More about Characterisation of radiated fields from PCBs in the time domain.

Theory of Stark spectroscopy transients from thin film organic semiconducting devices (2014)
Journal Article
MacKenzie, R. C. I., Göritz, A., Greedy, S., von Hauff, E., & Nelson, J. (2014). Theory of Stark spectroscopy transients from thin film organic semiconducting devices. Physical review B: Condensed matter and materials physics, 89, 1-9. https://doi.org/10.1103/physrevb.89.195307

Herein, we propose a model to describe picosecond-nanosecond charge separation and nongeminate recombination in organic semiconductors. The model is used to explain time-resolved electroabsorption (EA) measurements performed on diodes made from pheny... Read More about Theory of Stark spectroscopy transients from thin film organic semiconducting devices.

Complex locations of equivalent dipoles for improved characterization of radiated emissions (2014)
Journal Article
Obiekezie, C., Thomas, D. W., Nothofer, A., Greedy, S., Arnaut, L. R., & Sewell, P. (2014). Complex locations of equivalent dipoles for improved characterization of radiated emissions. IEEE Transactions on Electromagnetic Compatibility, 56(5), 1087-1094. https://doi.org/10.1109/TEMC.2014.2313406

© 2014 IEEE. The positioning of electromagnetic (EM) sources on the complex plane, though a mathematical construct, is often applied in solving EM problems with directive confined (collimated) propagation characteristics. Equivalent dipole modeling,... Read More about Complex locations of equivalent dipoles for improved characterization of radiated emissions.

A novel photonic crystal band-pass filter using degenerate modes of a point-defect microcavity for terahertz communication systems (2014)
Journal Article
Chun-Ping, C., Anada, T., Greedy, S., Benson, T. M., & Sewell, P. (2014). A novel photonic crystal band-pass filter using degenerate modes of a point-defect microcavity for terahertz communication systems. Microwave and Optical Technology Letters, 56(4), 792-797. https://doi.org/10.1002/mop.28204

Compact devices are important for the realization of terahertz communications systems. This article proposes a novel photonic crystal-based device for realizing microminiature, high-selectivity high Q band-pass filters (BPF) and the design of a dual-... Read More about A novel photonic crystal band-pass filter using degenerate modes of a point-defect microcavity for terahertz communication systems.

A small temperature rise may contribute towards the apparent induction by microwaves of heatshock gene expression in the nematode Caenorhabditis elegans (2006)
Journal Article
Dawe, A. S., Smith, B., Thomas, D. W., Greedy, S., Vasic, N., Gregory, A., Loader, B., & de Pomerai, D. I. (2006). A small temperature rise may contribute towards the apparent induction by microwaves of heatshock gene expression in the nematode Caenorhabditis elegans. Bioelectromagnetics, 27(2), https://doi.org/10.1002/bem.20192

We have previously reported that low-intensity microwave exposure (0.75-1.0 GHz CW at 0.5 W; SAR 4-40 mW kg-1) can induce an apparently non-thermal heat-shock response in Caenorhabditis elegans worms carrying hsp16-1::reporter genes. Using matched co... Read More about A small temperature rise may contribute towards the apparent induction by microwaves of heatshock gene expression in the nematode Caenorhabditis elegans.