Published in Annual Meeting of the Division of Nuclear Physics, 2008
This paper is about modelling antenna elements within a reconfigurable conformal framework.
Recommended citation: T. G. Pelham, "Simulation of d(7Be,t)6Be with Fresco, and investigation of resonant states of 6Be " 2008 Annual Meeting of the Division of Nuclear Physics, http://meetings.aps.org/link/BAPS.2008.DNP.DA.78
Published in Vehicular Technology Conference, 2015
This paper is about modelling antenna elements within a reconfigurable conformal framework.
Recommended citation: T. G. Pelham, G. Hilton, R. Lewis and C. Railton, "Variable Geometry Conformal Antenna Array for Element Comparison," 2015 IEEE 81st Vehicular Technology Conference (VTC Spring), Glasgow, 2015, pp. 1-5, doi: 10.1109/VTCSpring.2015.7146157. http://lyceanem.github.io/files/07146157.pdf
Published in IEEE International Symposium on Antennas and Propagation, 2015
This paper is about modelling antenna elements within a reconfigurable conformal framework, with reference to measurements of the same
Recommended citation: T. G. Pelham, G. Hilton, C. Railton and R. Lewis, "FDTD model performance analysis for a Cavity Slot Antenna array in a variable geometry conformal test rig," 2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting, Vancouver, BC, 2015, pp. 1836-1837, doi: 10.1109/APS.2015.7305307.
Published in Wideband and Multi-Band Antennas and Arrays for Civil, Security and Military Applications, 2015
This paper investigates an extension of Hannans equation for the maximum achievable directivity of a planar aperture
Recommended citation: T. Pelham, G. Hilton, E. Mellios and R. Lewis, "Predicting conformal aperture directivity for arbitrary curved surfaces," Wideband and Multi-Band Antennas and Arrays for Civil, Security & Military Applications, London, 2015, pp. 1-3, doi: 10.1049/ic.2015.0147.
Published in 10th European Conference on Antennas and Propagation, 2016
This paper is about modelling antenna elements within a reconfigurable conformal framework.
Recommended citation: T. G. Pelham, G. Hilton, E. Mellios, C. Railton and R. Lewis, "Conformal antenna array modelling, FDTD predictions and measurements for Dual Circular Patch in Variable Geometry Conformal Antenna Array Test Rig, " 2016 10th European Conference on Antennas and Propagation (EuCAP), Davos, 2016, pp. 1-4, doi: 10.1109/EuCAP.2016.7481683.
Published in IEEE Antennas and Wireless Propagation Letters, 2016
This paper is about predicting the on platform performance envelope for conformal antenna arrays
Recommended citation: T. Pelham, G. Hilton, E. Mellios and R. Lewis, "Predicting Conformal Aperture Gain From 3-D Aperture and Platform Models" IEEE Antennas and Wireless Propagation Letters, vol. 16, pp. 700-703, 2017, doi: 10.1109/LAWP.2016.2600403 .
Published in European Conference on Networks and Communications (EuCNC), 2017
This paper is about modelling antenna elements within a reconfigurable conformal framework.
Recommended citation: V. Kalokidou, T. Pelham, M. Beach, P. Legg and A. Lunness, "Link performance evaluation for mm-Wave systems ", 2017 European Conference on Networks and Communications (EuCNC), Oulu, 2017, pp. 1-5, doi: 10.1109/EuCNC.2017.7980712.
Published in European Conference on Antennas and Propagation, 2018
This paper is introduces a convenient method for characterization of integrated antenna arrays using packed measurements
Recommended citation: T. G. Pelham, D. Reyes, M. Beach, E. Mellios and M. Rumney, "Non-intrusive characterization of 60GHz antenna array, using packet measurements," 12th European Conference on Antennas and Propagation (EuCAP 2018), London, 2018, pp. 1-3, doi: 10.1049/cp.2018.1045.
Published in Annual International Symposium on Personal, Indoor and Mobile Radio Communications, 2018
This paper covers polarimetric multiband measurements of urban multipath propagation
Recommended citation: A. L. Freire, T. Pelham, D. Kong, L. Sayer, V. Sgardoni, F. Tila, E. Mellios, M. Beach, A. Nix, G. Steinböck, "Polarimetric Diffuse Scattering Channel Measurements at 26 GHz and 60 GHz," 2018 IEEE 29th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), Bologna, 2018, pp. 210-214, doi: 10.1109/PIMRC.2018.8581035.
Published in Royal Society Open Science, 2019
This paper is about evaluating 3D printed spiral phase plates for generating orbital angular momentum modes
Recommended citation: Allen B., Pelham T., Wu Y., Drysdale T., Isakov D., Gamlath C., Stevens C. J., Hilton G., Beach M. A. and Grant P. S. (2019) "Experimental evaluation of 3D printed spiral phase plates for enabling an orbital angular momentum multiplexed radio system" Royal Society Open Science https://royalsocietypublishing.org/doi/10.1098/rsos.191419
Published in 15th European Conference on Antennas and Propagation, 2021
This paper is part of a new series on over the air test (OTA) techniques at 26GHz.
Recommended citation: T. G. Pelham, A. L. Freire, G. Hilton, M. Beach
Published in 15th European Conference on Antennas and Propagation, 2021
This paper is part of a new series on over the air test (OTA) techniques at 26GHz.
Recommended citation: A. L. Freire, T. G. Pelham, G. Hilton, M. Beach
Published in IEEE Access, 2021
Conformal Antenna Array design methods, using raycasting for efficent on platform modelling
Recommended citation: T. G. Pelham, G. Hilton, E. Mellios, and R. Lewis https://ieeexplore.ieee.org/document/9408625
Published in Radar 2022, 2022
Demonstration of the workflow for rapid antenna array design and analysis using LyceanEM
Recommended citation: T. G. Pelham, "Rapid antenna and array analysis for virtual prototyping" International Conference on Radar Systems (RADAR 2022), Hybrid Conference, Edinburgh, UK, 2022, pp. 278-282, doi: 10.1049/icp.2022.2330 https://ieeexplore.ieee.org/document/10038925
Published in Royal Academy of Engineering Research Forum 2022, London, 2022
Vision to Radio, Computer Vision based Spatial Modelling for future Networks
Recommended citation: T. G. Pelham
Published in ICMS, Edinburgh, 2023
Demonstration of the workflow for rapid antenna array design and analysis using LyceanEM
Recommended citation: T. G. Pelham
Published in Military Sensing Symposium, 2023
As the cost of antenna arrays continues to decrease, there is an emerging opportunity for the combination of flexible electromagnetics models, modular and distributed antenna array design, and computer vision to provide enhancements to the situational awareness of platform operators. Combining computer vision, efficient electromagnetics modelling and radio channel measurements can provide a consistent understanding of the local environment for improved signals intelligence and situational awareness using commercial off the shelf (COTS) mobile AI modules.
Recommended citation: Pelham, T. G., (2023). Spatial Intelligence through combined sensing, using computer vision and on board electromagnetics modelling to enhance signals intelligence and situational awareness. Military Sensing Symposium - 2023
Published in The Journal of Open Source Software, 2023
Demonstration of the workflow for rapid antenna array design and analysis using LyceanEM
Recommended citation: Pelham, T. G., (2023). LyceanEM: A python package for virtual prototyping of antenna arrays, time and frequency domain channel modelling. Journal of Open Source Software, 8(86), 5234 https://joss.theoj.org/papers/10.21105/joss.05234#
Published in Operating in the Future Electromagnetic Environment Symposium, 2023
The electromagnetic environment represents a consistently open RF attack surface. Spatial fingerprinting is proposed as a fusion of spatial intelligence, onboard electromagnetic modelling and machine learning to allow nodes within a network to identify and localise transmitters in their locality . This capability forms the basis of reciprocal trust networks between nodes in a node work, enabling self securing behaviour, and the identification and localisation of unauthorised transmitters attempting to penetrate the network. This process is demonstrated using modelled and measured data of LoRa network packets with an Anechoic Chamber, allowing for complete modelling of the scattering environment within the spatial intelligence node, and localisation of the transmitters.
Recommended citation: Pelham, T. G., (2023). Spatial Fingerprinting for Future Self Securing Networks. Operating in the Future Electromagnetic Environment Symposium - 2023
Published in Operating in the Future Electromagnetic Environment Symposium, 2023
Global Navigation Satellite System (GNSS) data has become a stable of modern life, whether delivered through a smartphone, vehicle, or as part of an industrial dataset. The expectation of reliable position and time information, irrespective of the environment, becomes challenging in tunnels and canyons with significant multipath, whether natural or urban. An initial look at an open dataset of LIDAR, Computer Vision, and GNSS data is presented, combined with a channel model produced from this dataset, comparing the expected and measured line of sight and multipath contributions from GPS sources while moving around Bristol, from unobstructed surroundings to deep natural and urban canyons.
Recommended citation: Pelham, T. G., (2023). Spatial Modelling for GPS Replication in Natural and Urban Canyons. Operating in the Future Electromagnetic Environment Symposium - 2023
Published in Operating in the Future Electromagnetic Environment Symposium, 2024
Global Navigation Satellite System (GNSS) data has become a stable of modern life, whether delivered through a smartphone, vehicle, or as part of an industrial dataset. The expectation of reliable position and time information, irrespective of the environment, becomes challenging in tunnels and canyons with significant multipath, whether natural or urban. An initial look at an open dataset of LIDAR, Computer Vision, and GNSS data is presented, combined with a channel model produced from this dataset, comparing the expected and measured line of sight and multipath contributions from GPS sources while moving around Bristol, from unobstructed surroundings to deep natural and urban canyons.
Recommended citation: Timothy Pelham, Y Chen, S Liu, et al. Open Spatial Dataset for GNSS and Autonomous Navigation. TechRxiv. April 01, 2024. DOI: 10.36227/techrxiv.171198164.47035045/v1 https://www.techrxiv.org/users/690214/articles/737375-open-spatial-dataset-for-gnss-and-autonomous-navigation?commit=c669274e86b5ccb6e5ec356c5c3cab58a046b518
Published in International Conference on Energy from Space, 2024
Global Navigation Satellite System (GNSS) data has become a stable of modern life, whether delivered through a smartphone, vehicle, or as part of an industrial dataset. The expectation of reliable position and time information, irrespective of the environment, becomes challenging in tunnels and canyons with significant multipath, whether natural or urban. An initial look at an open dataset of LIDAR, Computer Vision, and GNSS data is presented, combined with a channel model produced from this dataset, comparing the expected and measured line of sight and multipath contributions from GPS sources while moving around Bristol, from unobstructed surroundings to deep natural and urban canyons.
Recommended citation: Pelham, T., Kudera, S. M. & Fearon, T. C. LyceanEM: GigaScale Electromagnetics for Beamforming and System Planning. International Conference on Energy from Space, London, United Kingdom, 19th April 2024. https://research-information.bris.ac.uk/en/publications/lyceanem-gigascale-electromagnetics-for-beamforming-and-system-pl
Published in 2024 18th European Conference on Antennas and Propagation (EuCAP), 2024
Gigascale antenna arrays (3 to 4 orders of magnitude more elements than the largest ever built) are a critical component of proposed space-based solar power (SBSP) systems. The transmitting antenna arrays in orbit are expected to be up to 3 km2 , while the receiving arrays on Earth have been proposed at up to 77 km2 . There are many challenges and risks in the design, modelling, operation and deployment of the gigascale antenna arrays in the SBSP system. This paper highlights these challenges and risks, reviews existing solutions and proposes novel approaches.
Recommended citation: T. Pelham, X. Chen, B. Collins, C. Parini and A. Brown, "An Overview of Gigascale Antenna Arrays and Electromagnetics for Space Based Solar Power," 2024 18th European Conference on Antennas and Propagation (EuCAP), Glasgow, United Kingdom, 2024, pp. 1-4, doi: 10.23919/EuCAP60739.2024.10501466. https://ieeexplore-ieee-org.bris.idm.oclc.org/document/10501466
Published in 2024 18th European Conference on Antennas and Propagation (EuCAP), 2024
The mechanical vibrations of a high-strain glass-fibre composite deployable X-band synthetic aperture radar (SAR) antenna structure are investigated using a finite element method. The antenna is approximately 2 m×0.3 m , and exhibits natural frequencies at 2.8 Hz and 7.6 Hz. The radiation patterns for a reflectarray formed from the structure are calculated using a ray-tracing approach for the nominal and mechanically deformed cases. The mechanically deformed antenna pattern is defocused, and a SAR system model shows this reduces the signal-to-noise ratio of a point scattering target by approximately 6 dB.
Recommended citation: Austin, A. C. M., Pelham, T., Mencarelli, S., Tresoldi, A., Dabboor, M., & Neve, M. (2024). Mechanical Vibrations on a Deployable Nanosatellite Antenna: SAR Performance Analysis. In 2024 18th European Conference on Antennas and Propagation (EuCAP) Article 10501343 (Proceedings of the European Conference on Antennas and Propagation). Institute of Electrical and Electronics Engineers (IEEE). https://doi.org/10.23919/EuCAP60739.2024.10501343 https://research-information.bris.ac.uk/admin/files/435189420/EuCAP2024_template.pdf
Published in 42nd ESA Antenna Workshop, 2024
A deployable corner reflector antenna for an 8U CubeSat operating at 1.5 GHz is proposed. The impact of reflector size, position, and opening angle is analysed using simulations for a monopole feed antenna. A fixed (non-deployable) prototype mounted on a 8U CubeSat chassis was found to improve the directivity from 3.7 dBi to 8.6 dBi when the reflectors were included, with good agreement between the simulated and measured radiation patterns.
Recommended citation: Austin, A. C. M., Pelham, T., Hilton, G., & Beach, M. A. (2024). Robust Deployable Reflectors for Antennas on Cubesats. Paper presented at 42nd ESA Antenna Workshop., Noordwijk, Netherlands. https://research-information.bris.ac.uk/en/publications/robust-deployable-reflectors-for-antennas-on-cubesats
Published in 2025 URSI International Symposium on Electromagnetic Theory (EMTS), 2025
Space-based solar power has been proposed as early as the 1960s as a source of reliable and clean energy. Due to reductions in the cost of orbital access it has received renewed interest in recent years. A practical challenge to the deployment of these systems is the requirement for ultra-large scale antenna arrays for wireless power transfer at scale, with proposed GW scale systems with antenna array diameters on the order of 2km, with billions of antenna elements. In this paper a development of the Rayleigh-Sommerfeld Diffraction Integral is introduced together with CUDA accelerated ray tracing for flexible modelling. A simplified parallel antenna array model is introduced at 10GHz demonstrating the effectiveness of different beamforming algorithms, together with preliminary results of a larger array scenario for wireless power transfer over 5.9km to a receiving array in a 5km square map tile.
Recommended citation: Pelham, T., & Fearon, T. C. (2025). A Scalable open-source electromagnetics model for Wireless power transfer and Space-Based Solar Power. In 2025 URSI International Symposium on Electromagnetic Theory (EMTS) (URSI International Symposium on Electromagnetic Theory). Institute of Electrical and Electronics Engineers (IEEE). https://doi.org/10.46620/URSIEMTS25/NKLW8291 https://research-information.bris.ac.uk/files/454482912/EMTS_Paper.pdf
Published in 2025 URSI International Symposium on Electromagnetic Theory (EMTS), 2025
An open source approach to rapid virtual prototyping of parabolic reflector antennas is proposed. The impact of focal distance, illuminator offset from focal spot, and platform scattering are examined for an antenna to be mounted to an 8U CubeSat chassis with a constant arc length for the parabolic reflector. A total of 30 parametric variations were simulated and antenna patterns predicted in 16 minutes. The selected parabolic reflector was prototyped and measured on platform, with a correlation of 0.59 between the predicted and measured antenna patterns, with maximum total directivity of 20.6dBi and 17.6dBi respectively.
Recommended citation: Pelham, T., & Austin, A. C. M. (2025). Rapid Virtual Prototyping for Cubesat Scale Deployable Reflector Antennas. In 2025 URSI International Symposium on Electromagnetic Theory (EMTS) (URSI International Symposium on Electromagnetic Theory). Institute of Electrical and Electronics Engineers (IEEE). https://doi.org/10.46620/URSIEMTS25/YXDS2743 https://research-information.bris.ac.uk/admin/files/454482977/EMTS_Paper_Virtual_Prototyping.pdf
Published:
As mobile communications expands to higher frequency domains, the development of accurate, cost effective methods of antenna array design and over the air (OTA) validation is required to ensure that user equipment is capable of meeting the system requirements of beamformed directivity and pointing accuracy. In the course of developing these methods, GPU enhanced modelling allows for accurate simulation of the scenarios under test and exploration of different system configurations
The talk can be found on Youtube here.
Published:
As GPU capabilities allow for more detailed electromagnetics and physical models to be explored on smaller platforms, there is an opportunity for overlap between ways of measuring the 3D space, and the measurement architecture itself. The use of different sensing modes for Digital Twins allows for the possibility of radio frequency measurements with accompanying computer vision or lidar measurements, in order to allow the researcher to account for the signature of the built environment, office space, or anechoic chamber within the measurement. Initial work will be present, and the concept explored for future work.
Published:
A tutorial on antenna array design for complex platforms at Radar 2022 in Edinburgh. As the demand for integrated radar systems increases, there is a commensurate need for consistent model based approaches to the design and integration of antennas and antenna arrays in the overall platform and system models. On mobile platforms, the interior volume and surface footprint available to sensors is a critical resource, while for fixed structures, the influence of the local environment must be considered if a proposed radar system is to meet the desired system performance requirements.
Undergraduate course, University of Bristol, Department of Electrical and Electronic Engineering, 2018
Introduction to the basic principles of circuit analysis. Introducing electrical components, and the fundamental laws that govern the behaviour of electrical circuits under both direct and alternating current.
Undergraduate course, University of Bristol, Department of Electrical and Electronic Engineering, 2018
Understanding of the behaviour of transistors, and the design of circuits using MOSFET and BJT devices. Covering the effects of feedback, amplifier design, and the operation of oscillators and `tank’ circuits.
Masters course, University of Bristol, Department of Electrical and Electronic Engineering, 2019
This course is designed to give an understanding of the issues involved in the design and evaluation of equipment that must comply with electromagnetic compatibility standards. Covering the circuits and structures which give rise to interference, and the mechanisms by which this occurs. Calculating the crosstalk between different conductors, while introducing the different methods of screening and grounding to mitigate this interference.