Research Repository

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Stochastic electromagnetic field propagation: measurement and modelling (2018)
Journal Article
Gradoni, G., Russer, J., Baharuddin, M. H., Haider, M., Russer, P., Smartt, C., … Thomas, D. W. (2018). Stochastic electromagnetic field propagation: measurement and modelling. Philosophical Transactions A: Mathematical, Physical and Engineering Sciences, 376, doi:10.1098/rsta.2017.0455. ISSN 1364-503X

This paper reviews recent progress in the measurement and modelling of stochastic electromagnetic fields, focusing on propagation approaches based on Wigner functions and the method of moments technique. The respective propagation methods are exempli... Read More

Correlation matrix methods to assess the stirring performance of electromagnetic reverberation chambers (2018)
Journal Article
Gradoni, G., Moglie, F., & Mariani Primiani, V. (2018). Correlation matrix methods to assess the stirring performance of electromagnetic reverberation chambers. Wave Motion, doi:10.1016/j.wavemoti.2018.09.008

The use of correlation matrices to evaluate the number of uncorrelated stirrer positions of electromagnetic reverberation chambers has widespread applications in electromagnetic compatibility. We present a review of recent methods based on multivaria... Read More

Analysis of nonstationary emissions for efficient characterization of stochastic EM fields (2018)
Conference Proceeding
Baharuddin, M. H., Smartt, C., Maricar, M. I., Thomas, D. W., Gradoni, G., Creagh, S. C., & Tanner, G. (2018). Analysis of nonstationary emissions for efficient characterization of stochastic EM fields. doi:10.1109/EMCEurope.2018.8485104

A statistical approach using field-field correlation functions which is obtained from two-probe time domain measurement is used to characterize the radiation from complex devices. The time-frequency analysis provided by the measurement data has shown... Read More

A Secure Waveform Format for Interference Mitigation in Heterogeneous Uplink Networks (2018)
Journal Article
Zeng, Q., Nasser, H., & Gradoni, G. (2018). A Secure Waveform Format for Interference Mitigation in Heterogeneous Uplink Networks. IEEE Access, 6, 41688-41696. doi:10.1109/access.2018.2858840

In heterogeneous networks (HetNets), providing reliable and secure transmission uplinks to combat the potential interference is a major challenge. We address the multi-tier uplink interference issue, inspired by the secure waveform design in spatial... Read More

Near-field MIMO communication links (2018)
Journal Article
Phang, S., Ivrlac, M. T., Gradoni, G., Creagh, S. C., Tanner, G., & Nossek, J. A. (in press). Near-field MIMO communication links. IEEE Transactions on Circuits and Systems I: Regular Papers, doi:10.1109/TCSI.2018.2796305. ISSN 1549-8328

A procedure to achieve near-field multiple input multiple output (MIMO) communication with equally strong channels is demonstrated in this paper. This has applications in near-field wireless communications, such as Chip-to-Chip (C2C) communication or... Read More

Near-field scanning and propagation of correlated low-frequency radiated emissions (2017)
Journal Article
Gradoni, G., Madenoor Ramapriya, D., Creagh, S. C., Tanner, G., Baharuddin, M. H., Nasser, H., …Thomas, D. W. (2017). Near-field scanning and propagation of correlated low-frequency radiated emissions. IEEE Transactions on Electromagnetic Compatibility, doi:10.1109/TEMC.2017.2778046. ISSN 0018-9375

Electromagnetic radiation from complex printed circuit boards can occur over a broad frequency bandwidth, ranging from hundreds of MHz to tens of GHz. This is becoming a critical issue for assessment of EMC and interoperability as electronic componen... Read More

Base-case model for measurement uncertainty in a reverberation chamber including frequency stirring (2017)
Journal Article
Gifuni, A., Bastianelli, L., Moglie, F., Mariani Primiani, V., & Gradoni, G. (in press). Base-case model for measurement uncertainty in a reverberation chamber including frequency stirring. IEEE Transactions on Electromagnetic Compatibility, doi:10.1109/TEMC.2017.2763627. ISSN 0018-9375

We address the uncertainty of reverberation chamber (RC) measurements in presence of both mechanical and frequency stirring (FS). A base-case model is derived for reverberation fields affected by the measurement uncertainty due to the lack of a perfe... Read More

Wigner function based propagation of stochastic field emissions from planar electromagnetic sources (2017)
Journal Article
Gradoni, G., Arnault, L. R., Creagh, S. C., Tanner, G., Baharuddin, M. H., Smartt, C., & Thomas, D. W. (2018). Wigner function based propagation of stochastic field emissions from planar electromagnetic sources. IEEE Transactions on Electromagnetic Compatibility, 60(3), 580-588. doi:10.1109/TEMC.2017.2738329

Modelling the electromagnetic radiation from modern digital systems – acting effectively as extended, stochastic sources as part of a complex architecture – is a challenging task. We follow an approach here based on measuring and propagating field-fi... 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

Absorption cross section of building materials at mm wavelength in a reverberation chamber (2017)
Journal Article
Micheli, D., Delfini, A., Pastore, R., Marchetti, M., Diana, R., & Gradoni, G. (2017). Absorption cross section of building materials at mm wavelength in a reverberation chamber. Measurement Science and Technology, 28(2), doi:10.1088/1361-6501/aa53a1. ISSN 0957-0233

The reverberation chamber (RC) method is used to estimate the average absorption cross section of building materials at mm wave frequencies. Analysed samples include concrete, travertine and bricks of different types. The investigation is carried out... Read More

Propagating wave correlations in complex systems (2016)
Journal Article
Creagh, S. C., Gradoni, G., Hartmann, T., & Tanner, G. (2016). Propagating wave correlations in complex systems. Journal of Physics A: Mathematical and Theoretical, 50(4), doi:10.1088/1751-8121/50/4/045101. ISSN 1751-8113

We describe a novel approach for computing wave correlation functions inside finite spatial domains driven by complex and statistical sources. By exploiting semiclassical approximations, we provide explicit algorithms to calculate the local mean of t... 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

Transfer operator approach for cavities with apertures (2016)
Conference Proceeding
Gradoni, G., Creagh, S., & Tanner, G. (2016). Transfer operator approach for cavities with apertures. In 2016 URSI International Symposium on Electromagnetic Theory (EMTS), 682-685. doi:10.1109/URSI-EMTS.2016.7571490

We describe a representation of the boundary inte- gral equations for wave propagation in enclosures which leads to a direct description of transport and dynamical characteristics of the problem. The formalism is extended to account for arbitrary and... Read More

Localized single frequency lasing states in a finite parity-time symmetric resonator chain (2016)
Journal Article
Phang, S., Vukovic, A., Creagh, S. C., Sewell, P., Gradoni, G., & Benson, T. M. (2016). Localized single frequency lasing states in a finite parity-time symmetric resonator chain. Scientific Reports, 6, doi:10.1038/srep20499. ISSN 2045-2322

In this paper a practical case of a finite periodic Parity Time chain made of resonant dielectric cylinders is considered. The paper analyzes a more general case where PT symmetry is achieved by modulating both the real and imaginary part of the mate... Read More

A phase-space approach for propagating field–field correlation functions (2015)
Journal Article
Gradoni, G., Creagh, S. C., Tanner, G., Smartt, C., & Thomas, D. W. (2015). A phase-space approach for propagating field–field correlation functions. New Journal of Physics, 17, doi:10.1088/1367-2630/17/9/093027. ISSN 1367-2630

We show that radiation from complex and inherently random but correlated wave sources can be modelled efficiently by using an approach based on the Wigner distribution function. Our method exploits the connection between correlation functions and the... Read More