Dr James Bell

Lecturer - Teaching and Research

Email:: belljj1@cardiff.ac.uk
Telephone:: +44 (0)29 2087 9378
Location:: S1.03, Queen's Buildings - South Building, 5 The Parade, Newport Road, Cardiff, CF24 3AA

: Available for postgraduate supervision

James Bell is the year-1 tutor for the Electrical and Electronic Engineering and Integrated Engineering degree programs at Cardiff University. He received the bachelor’s and Ph.D. degrees from Cardiff University in 2009 and 2013 respectively. He has worked in the Centre for High Frequency Engineering here at Cardiff University, where he has been involved with the development of nonlinear measurement systems, the "Cardiff Model" and high-efficiency power amplifier design. He is currently a lecturer and year-1 tutor in the School of Engineering at Cardiff University and remains a member of the Centre for High Frequency Engineering. He continues his work in the areas of behavioural modelling, RF and millimeter-wave measurement systems, and broadband power amplifier design.

Professional memberships

Member of the IEEE

2019

Husseini, T.et al. 2019. Global behavioural model generation using coefficients interpolation. Presented at: 2019 IEEE MTT-S International Microwave Symposium, IMS 2019, Boston, USA, 2 -7 June 2019. pp. -.

2018

Husseini, T.et al. 2018. On the effective modeling of the test-set non-linearity. Presented at: 2018 91st ARFTG Microwave Measurement Conference (ARFTG), Philadelphia, PA, USA, 15 June 20182018 91st ARFTG Microwave Measurement Conference (ARFTG). IEEE, (10.1109/ARFTG.2018.8423832)
Bogusz, A.et al. 2018. Power and efficiency continuous modes in saturated GaN HEMT devices. Presented at: Inmmic 2018, Brive-La-Gaillarde, France, 5- 6 July 2018.

2017

Quaglia, R., Bell, J. J. and Cripps, S. C. 2017. New general formulation and experimental verification of harmonic clipping contours in high frequency power devices. IEEE Transactions on Microwave Theory and Techniques 65(10), pp. 3903-3909. (10.1109/TMTT.2017.2687900)

2014

Bell, J. J. 2014. Input Harmonic and Mixing Behavioural Model Analysis. PhD Thesis, Cardiff University.
Koh, M.et al. 2014. Frequency scalable large signal transistor behavioral model based on admittance domain formulation. Presented at: International Microwave Symposium, Tampa, Florida, 1-6 June 20142014 IEEE MTT-S International Microwave Symposium (IMS). Picastaway, NJ: IEEE pp. 1-3., (10.1109/MWSYM.2014.6848287)

2013

Koh, M.et al. 2013. X-band MMIC scalable large signal model based on unit cell behavioral data model and passive embedding network. Presented at: International Microwave Symposium, Seattle, WA, 2-7 June 20132013 IEEE MTT-S International Microwave Symposium Digest (IMS). Picastaway, NJ: IEEE pp. 1-4., (10.1109/MWSYM.2013.6697424)
Aldoumani, A.et al. 2013. Operation and calibration of VNA-based large signal RF I-V waveform measurements system without using a harmonic phase reference standard. Presented at: ARFTG Microwave Measurement Conference (ARFTG), Seattle, WA, 7-7 June 20132013 81st ARFTG Microwave Measurement Conference (ARFTG). Picastaway, NJ: IEEE pp. 1-4., (10.1109/ARFTG.2013.6579055)

2011

Bell, J. J.et al. 2011. Behavioral model analysis using simultaneous active fundamental load-pull and harmonic source-pull measurements at X-band. Presented at: 2011 IEEE/MTT-S International Microwave Symposium, Baltimore, MD, USA, 5-10 June 2011Microwave Symposium Digest (MTT), 2011 IEEE MTT-S International. New York: IEEE pp. 982-986., (10.1109/MWSYM.2011.5972803)
Powell, J. R.et al. 2011. GaAs X-band high efficiency (65%) broadband (30%) amplifier MMIC based on the Class B to Class J continuum. Presented at: 2011 IEEE/MTT-S International Microwave Symposium, Baltimore, MD, USA, 5-10 June 2011 Presented at Seigel, P. et al. eds.2011 IEEE/MTT-S International Microwave Symposium - MTT 2011. New York: IEEE pp. 355., (10.1109/MWSYM.2011.5973350)
Saini, R.et al. 2011. High speed non-linear device characterization and uniformity investigations at X-band frequencies exploiting behavioral models. Presented at: 2011 77th ARFTG Microwave Measurement Conference (ARFTG), Baltimore, MD, USA, 10 June 2011Design and Measurement of Microwave Systems - Proceedings of the 2011 77th ARFTG Microwave Measurement Conference (ARFTG). Los Alamitos, CA: IEEE, (10.1109/ARFTG77.2011.6034552)
Saini, R.et al. 2011. Interpolation and extrapolation capabilities of non-linear behavioural models. Presented at: 2011 78th ARFTG Microwave Measurement Symposium (ARFTG), Tempe, AZ, USA, 1-2 December 2011Proceedings of the 2011 78th ARFTG Microwave Measurement Symposium (ARFTG) - High Power RF Measurement Techniques. Los Alamitos, CA: IEEE, (10.1109/ARFTG78.2011.6183865)

Year-1 Tutor

EN1072 Laboratory (Module Leader)

EN1092 Professional Engineering (Module Leader)

EN3818 Analogue and Digital Communications Systems (Module Contributor)

EN4110 Mechatronics (Space Drone Project)

ENT798 Non-Linear RF Design and Concepts (Module Leader)

James' research interests include, but are not limited to, behavioural modelling, intelligent measurement systems, and power amplifier design. He is currently working on robust automated load-pull measurement systems; augmenting the 'Cardiff Behavioural Model' framework for measurement system control and robust CAD models for PA design; and the practical application of ‘Clipping Contours’ for the design of linear or linearisable PAs. James works closely with international industry and academics, as his research impacts both sectors.