Research Repository

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An electrical equivalent circuit to simulate the output power of an AlGaAs/GaAs planar Gunn diode (2018)
Journal Article
Maricar, M. I., Khalid, A., Dunn, G., Greedy, S., Thomas, D. W., Cumming, D., & Oxley, C. (2018). An electrical equivalent circuit to simulate the output power of an AlGaAs/GaAs planar Gunn diode. Microwave and Optical Technology Letters, 60(9), (2144-2148). doi:10.1002/mop.31312. ISSN 0895-2477

The planar Gunn diode offers the potential of microwave, milli-metric and THz based oscillator which can be fabricated as part of a microwave monolithic integrated circuit (mmic). To-date the RF output power has been too low for many applications. Th... Read More

Electromagnetic shielding effectiveness of fiber-reinforced composites: a preliminary study (2018)
Conference Proceeding
Munalli, D., Chronopoulos, D., & Greedy, S. (2018). Electromagnetic shielding effectiveness of fiber-reinforced composites: a preliminary study

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

EMC-oriented multi-conductor equivalent circuit cable models for Spice, including transfer impedance coupling and incident field excitation (2017)
Conference Proceeding
Smartt, C., Basford, M., Greedy, S., Thomas, D., & Sumner, M. (2017). EMC-oriented multi-conductor equivalent circuit cable models for Spice, including transfer impedance coupling and incident field excitation. doi:10.1109/ICEAA.2017.8065507

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

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., …Thomas, D. W. (2017). Design and characterization of a diamond-shaped monopole antenna. Microwave and Optical Technology Letters, 59(10), doi:10.1002/mop.30790. ISSN 0895-2477

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

Analysis of conducted emissions from an Electric Nacelle Anti-Ice power control system (2016)
Conference Proceeding
Nothofer, A., Tarisciotti, L., Zhou, Q., Benson, T. M., Greedy, S., & Christopoulos, C. (2016). Analysis of conducted emissions from an Electric Nacelle Anti-Ice power control system. In 2016 International Symposium on Electromagnetic Compatibility - EMC EUROPEdoi:10.1109/EMCEurope.2016.7739261

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

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., …Tuck, C. (2017). 3D inkjet-printed UV-curable inks for multi-functional electromagnetic applications. Additive Manufacturing, 13, doi:10.1016/j.addma.2016.10.002. ISSN 2214-7810

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

Time domain measurement of near field emissions from complex PCBs (2016)
Conference Proceeding
Thomas, D., Greedy, S., Smartt, C., Nasser, H., Baharuddin, M., Gradoni, G., …Tanner, G. (2016). Time domain measurement of near field emissions from complex PCBs. doi:10.1109/EuMC.2016.7824441

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

Conducted emission evaluation for direct matrix converters (2016)
Conference Proceeding
Nothofer, A., Tarisciotti, L., Greedy, S., Empringham, L., De Lillo, L., & Degano, M. (2016). Conducted emission evaluation for direct matrix converters

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

Open source cable models for EMI simulations (2016)
Conference Proceeding
Greedy, S., Smartt, C., & Thomas, D. W. (2016). Open source cable models for EMI simulations. In IEEE Electromagnetic Compatibility Magazine , 69-81. doi:10.1109/AeroEMC.2016.7504590

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

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., …von Hauff, E. (2016). Loss mechanisms in high efficiency polymer solar cells. Advanced Energy Materials, 6(4), 1-7. doi: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

Characterisation of radiated fields from PCBs in the time domain (2015)
Conference Proceeding
Thomas, D., Smartt, C., & Greedy, S. (2015). Characterisation of radiated fields from PCBs in the time domain. In 2015 IEEE International Symposium on Electromagnetic Compatibility (EMC), 947-952. doi:10.1109/ISEMC.2015.7256293

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

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. doi: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

Analysis of a near field MIMO wireless channel using 5.6 GHz dipole antennas
Conference Proceeding
Maricar, M. I., Gradoni, G., Greedy, S., Ivrlac, M. T., Nossek, J. A., Phang, S., …Thomas, D. W. (in press). Analysis of a near field MIMO wireless channel using 5.6 GHz dipole antennas

Understanding the impact of interference upon the performance of a multiple input multiple output (MIMO) based device is of paramount importance in ensuring a design is both resilient and robust. In this work the effect of element-element interferenc... Read More