James Kelly | University of Surrey

Dr James Kelly

Lecturer in Microwave Antennas

MEng (Hons), PhD, PG Cert ULT, MIEEE

+44 (0)1483 689480

j.r.kelly@surrey.ac.uk

08 CII 01

Wednesdays 1-2pm

About
In the media

Research

Teaching and supervision

Publications

Biography

I am a Lecturer (Assistant Professor) in Microwave Antennas within the Department of Electrical and Electronic Engineering and a member of the Institute for Communication Systems (ICS) at the University of Surrey. I joined the University of Surrey in October 2013. Before this I was a Lecturer at Anglia Ruskin University in Cambridge, England. From 2007 to 2012 I worked as a research fellow/associate at Loughborough University, as well as the Universities of Birmingham, Durham, and Sheffield.

I have approximately 2.5 years of industry experience. From 1999 to 2000, I worked for the International Rail Vehicle Consultancy, Interfleet Technology. During 2001 and 2012, respectively I worked within the Rolls-Royce Strategic Research Centre and at Airbus Defence and Space Ltd (then EADS Astrium).

I received the Master's degree in electronic and electrical engineering (2002) and the Ph.D. degree in microwave filters (2007) from Loughborough University, Leicestershire, England.

I have published over 80 academic papers in peer reviewed international journals and conference proceedings. In 2009 I delivered the key note speech at an IET seminar in London. The topic of the seminar was “Adaptable and tunable antenna technology for handsets and mobile computing products”. I also co-chaired a session on adaptive antennas for software defined radio during the 2009 IEEE International Symposium on Antennas and Propagation, in Toronto, Canada.

I am a member of the Institution of Engineering and Technology (IET), the Institute of Electrical and Electronics Engineers (IEEE), and the IEEE Industrial Electronics Society. I frequently act as a referee for various international journal publications, including the IEEE Transactions on Antennas and Propagation, the IEEE Antennas and Wireless Propagation Letters, and the IET Microwaves, Antennas & Propagation.

Areas of specialism

Microwave Antennas

University roles and responsibilities

Additional Learning Support (ALS) Tutor for Electronic Engineering

Research

Research interests

My main research focus is reconfigurable microwave and millimeter wave antennas. Other research interests: small antennas, handset antennas, millimeter wave antennas, ultra-wideband antennas, body-worn antennas, reconfigurable microwave filters, metamaterials.

Research projects

Informed RF for 5G and Beyond (EP/N020391/1)

Project seeks to devise high performance communication systems using a holistic design approach uniting Microwave Engineering with Signal Processing and considering RF imparements as degrees-of-fredom to be exploited in the design process

Metrology for 5G Communications

The overall objective of the project is to develop traceable metrology required by 5G communications, to improve the associated measurement uncertainties and to provide metrological support on activities related to standardisation for 5G.

Millimeter-wave Antennas and Components for Future Mobile Broadband Networks: MILLIBAN (EP/P008380/1)

Project seeks to develop antennas and components for future generations of mobile communication systems

My teaching

Antennas and Propagation (EEEM006)

Laboratories, Design & Professional Studies II (EEE1028)

Laboratories, Design & Professional Studies III (EEE2036)

My publications

Publications

Idris IH, Hamid MR, Jamaluddin MH, Rahim MKA, Kelly JR, Majid HA (2014) Single-, dual- and triple-band frequency reconfigurable antenna, Radioengineering 23 (3) pp. 805-811

View abstract

The paper presents a frequency reconfigurable slot dipole antenna. The antenna is capable of being switched between single-band, dual-band or triple-band operation. The antenna incorporates three pairs of pindiodes which are located within the dipole arms. The antenna was designed to operate at 2.4 GHz, 3.5 GHz and 5.2 GHz using the aid of CST Microwave Studio. The average measured gains are 1.54, 2.92 and 1.89 dBi for low, mid and high band respectively. A prototype was then constructed in order to verify the performance of the device. A good level of agreement was observed between simulation and measurement.

Borja A, Kelly JR (2015) Reconfigurable Microwave Circuit Based on a Single Triangular Microstrip Patch, 2015 IEEE INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION & USNC/URSI NATIONAL RADIO SCIENCE MEETING pp. 2253-2254 IEEE

Kelly JR, Borja AL (2014) Hardware block for use in programmable microwave function arrays, Electronics Letters 50 (15) pp. 1076-1077

View abstract

Ultimately, the research presented will lead to the development of a microwave integrated circuit that is analogous to a field programmable gate array. An early step towards the development of this technology is presented. Specifically, a 3-port device, based on a single resonant element, namely a microstrip square patch, is described. The device operates simultaneously as a filter and an antenna. Filter performance is obtained between ports 1 and 2. Antenna performance is obtained on port 3. © 2014 The Institution of Engineering and Technology.

Wang Z, Kelly JR, Hall PS, Borja AL, Gardner P (2014) Reconfigurable parallel coupled band notch resonator with wide tuning range, IEEE Transactions on Industrial Electronics 61 (11) pp. 6316-6326

View abstract

This paper presents a new form of reconfigurable band notch resonator with a wide tuning range. The whole structure consists of a through line and two parallel coupled resonators. This paper presents an accurate lumped element equivalent circuit for the parallel coupled resonator. The mechanism giving rise to the wide tuning range is also investigated. The first harmonic of the fundamental stop-band is analyzed and compared with that of the varactor-coupled resonator. Measurement results show that the stop-band of the filter can be tuned from 0.6 to 4.0 GHz. This is achieved by varying the capacitance of two pairs of varactor diodes. The stop-band tuning range is restricted by the capacitance variation which can be achieved using the varactor diode. The potential tuning range of a filter based on this resonator is greater than one decade. © 1982-2012 IEEE.

Wei JD, Chen XZ, Kelly JR, Cui YZ (2015) Blast furnace stockline measurement using radar, IRONMAKING & STEELMAKING 42 (7) pp. 533-541 MANEY PUBLISHING

Kelly JR, Borja A (2015) Reconfigurable Microwave Circuit Based on Three Triangular Microstrip Patches, 2015 IEEE INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION & USNC/URSI NATIONAL RADIO SCIENCE MEETING pp. 2251-2252 IEEE

Chen G, Xiao P, Kelly J, Li B, Tafazolli R (2017) Full-Duplex Wireless-Powered Relay in Two Way Cooperative Networks, IEEE Access 5 pp. 1548-1558 IEEE

View abstract View full publication

This paper investigates a full duplex wirelesspowered two way communication networks, where two hybrid access points (HAP) and a number of amplify and forward (AF) relays both operate in full duplex scenario. We use time switching (TS) and static power splitting (SPS) schemes with two way full duplex wireless-powered networks as a benchmark. Then the new time division duplexing static power splitting (TDD SPS) and full duplex static power splitting (FDSPS) schemes as well as a simple relay selection strategy are proposed to improve the system performance. For TS, SPS and FDSPS, the best relay harvests energy using the received RF signal from HAPs and uses harvested energy to transmit signal to each HAP at the same frequency and time, therefore only partial self-interference (SI) cancellation needs to be considered in the FDSPS case. For the proposed TDD SPS, the best relay harvests the energy from the HAP and its self-interference. Then we derive closed-form expressions for the throughput and outage probability for delay limited transmissions over Rayleigh fading channels. Simulation results are presented to evaluate the effectiveness of the proposed scheme with different system key parameters, such as time allocation, power splitting ratio and residual SI.

Kelly JR (2015) PIFA with Reconfigurable Frequency Bandwidth, 2015 IEEE INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION & USNC/URSI NATIONAL RADIO SCIENCE MEETING pp. 2255-2256 IEEE

Uchendu I, Kelly JR (2017) Ultrawide isolation bandwidth Compensated Power Divider for UWB applications, Microwave and Optical Technology Letters 59 (12) pp. 3177-3180 John Wiley & Sons

View abstract View full publication

This article presents design analyses for achieving an ultrawide isolation bandwidth compensated power divider (CPD). The CPD offers improvement in complexity, size and insertion when compared with alternative techniques for increasing isolation bandwidth. A prototype CPD with -15dB isolation bandwidth of 114% was fabricated and measured to validate the analyses.

Wang Z, Hall P, Kelly JR, Gardner P (2017) Wideband Frequency Domain and Space Domain Pattern Reconfigurable Circular Antenna Array, IEEE Transactions on Antennas and Propagation 65 (10) pp. 5179-5189 IEEE

View abstract View full publication

This paper presents a wideband circular antenna array with a frequency domain and space domain reconfigurable radiation pattern. A wideband circular array antenna is designed with omni-directional radiation pattern, in azimuth direction, throughout the whole frequency band. The antenna array consists of eight TEM horn antennas. The antenna array exhibits an omni-directional azimuthal radiation pattern when all eight ports are excited with signals of the same magnitude and phase. The antenna array is fed through eight reconfigurable bandstop filters and a power splitter. This enables it to provide an omni-directional azimuthal pattern along with a single directional pattern null in a given spatial direction and at a certain frequency. Both the spatial direction and the frequency can be altered. The antenna works from 0.8 GHz to 3.0 GHz. The antenna array will be useful in combating interference in wideband communication systems. It will also be of value in surveillance military applications.

da Costa I, Filgueiras H, Kelly J, Arismar Cerqueira S, Xiao P (2018) Mechanical Beam Steering Circular Patch Antenna, EuCAP 2018 Proceedings

View abstract View full publication

This work reports preliminary results and a
prototype of an innovative mechanical beam steering circular
patch antenna for 5G indoor cellular access networks with sub6
GHz operation. The beam steering is achieved using 18 screws
installed around the circular patch radiator, working as a
reflector by proper managing the screws position and height.
The new antenna can steer its main beam over 360º in azimuth
plane and from -30º to 30º in the elevation plane with gain up to
8.01 dBi at 4.6 GHz.

Allayioti M, Kelly J, Mittra R (2018) Beam and Polarisation Reconfigurable Microstrip Antenna Based on Parasitics, Microwave and Optical Technology Letters Wiley

View abstract View full publication

This paper presents a dual-notch polarization and beam reconfigurable microstrip antenna. It uses parasitics which incorporate switches to steer its beam away from boresight and dual-notches which, again, incorporate switches to reconfigure between linear and circular polarization. The antenna is a low profile microstrip patch antenna which only uses a single feed, allowing it to be compact and simple in terms of its structure.

Kelly J, Alqurashi K, Filgueiras H, da Costa I, Cerqueira S. Jr. A, Xiao P, Chen Z, Wong H (2018) Millimeter Wave Beam Steerable/Reconfigurable Liquid Metal Array Antenna, Proceedings of ICEAA - IEEE APWC - FEM 2018 Institute of Electrical and Electronics Engineers (IEEE)

View abstract View full publication

Users within mobile networks require ever increasing data rates. However, the frequency spectrum, reserved for mobile networks, is highly saturated. The millimeter wave spectrum, by contrast is relatively under utilised. Nonetheless, this area of the spectrum suffers from higher propagation losses, necessitating the use of highly directional antennas. To support mobility these antennas require beam steering capabilities. For several applications wide beam scanning capability is required. A valuable approach for increasing the beam scanning range is to use element factor plus array factor control [1]. Although several authors have presented designs based on this approach the lobe performance of those antennas is generally quite poor. In this paper we seek to address that issue.

Borja A, Kabiri Y, Belenguer A, Kelly J (2018) Programmable Multi-Functional RF/Microwave Circuit for Antenna and Filter Operation, IEEE Transactions on Antennas and Propagation Institute of Electrical and Electronics Engineers (IEEE)

View abstract View full publication

This paper describes a multi-functional microwave
device that can be reconfigured to behave either as a filter or an
antenna. The device is based around a single resonant element,
referred to as a building block element that is connected to 4
ports. The resonant element is a microstrip square patch
working in the 2.45 GHz unlicensed Industrial Scientific and
Medical (ISM) band used for IEEE 802.11 WiFi. The proposed
building block is simple in its design and construction. The paper
also presents devices composed of three building blocks, which
can realize more complex filtering and antenna mode
performance. In addition, PIN diodes have also been
incorporated into the devices in order to facilitate electronic
control. Measured results, pertaining to fabricated prototypes,
show that filter and antenna operation can be achieved, in the
same device at a frequency of around 2.45 GHz with acceptable
insertion loss and efficiency. In the future, it is anticipated that
this could lead to a new paradigm, namely a device that is
analogous to a field programmable gate array (FPGA) operating
in the microwave frequency regime.

Additional publications

Journal Papers

[1] James R. Kelly, Titos Kokkinos, and Alexandros P. Feresidis, “Analysis and design of sub-wavelength resonant cavity type 2-D leaky-wave antennas,” IEEE Trans. Antennas and Propag., vol. 56, no. 9, pp. 2817-25, Sept. 2008.

[2] James R. Kelly and Rob D. Seager, “Lumped element equivalent circuit for the cymbal resonator bandpass filter,” Microw. and Optical Tech. Lett., vol. 50, no. 9, pp. 2381–4, Jun. 2008.

[3] James R. Kelly and Rob D. Seager, “Approximating the Eigenvalues of Planar Isosceles Triangular Patch Resonators using Galerkin’s Method,” Microw. and Optical Tech. Lett., vol. 51, no. 2, pp. 306 – 11, Dec. 2008.

[4] James R. Kelly and Rob D. Seager, “A Compact Triangular Patch Bandpass Filter,” Microw. and Optical Tech. Lett., vol. 51, no. 2, pp. 566-70, Dec. 2008.

[5] James R. Kelly and Rob D. Seager, “Novel Metallodielectric Electromagnetic Bandgap Structure,” Microw. and Optical Tech. Lett., vol. 51, no. 2, pp. 311–5, Dec. 2008.

[6] James R. Kelly, and Alexandros P. Feresidis, “Array antenna with increased element separation based on a Fabry-Perot resonant cavity with AMC Walls,” IEEE Trans. Antennas and Propag., vol. 57, no. 3, pp. 682-7, March 2009.

[7] F. Ghanem, P. Hall, and J. Kelly, “A two-port frequency reconfigurable antenna for cognitive radios” IET Electron. Lett., vol. 45, no. 11, pp. 534-6, May 21, 2009.

[8] Z. H. Hu, C. T. P. Song, J. Kelly, P. S. Hall, and P. Gardner, “Wide tunable dual-band reconfigurable antenna,” IET Electron. Lett., vol. 45, no. 22, pp.1109-10, Oct. 22, 2009.

[9] J.R. Kelly, P.S. Hall, P. Gardner, and F. Ghanem, “Integrated narrow/band-notched UWB antenna,” IET Electron. Lett., vol. 46, no. 12, pp. 814- 16, Jun. 2010.

10] Z.P. Wang, J. Kelly, P.S. Hall, “Reconfigurable bandstop filter with wide tuning range,” IET Electron. Lett., vol. 46, no. 11, pp. 771-2, May 2010.

[11] Z.H. Hu, P.S. Hall, J.R. Kelly and P. Gardner, “Wideband Conical Monopole Antenna with Frequency Band Notched Behaviour,” IET Electron. Lett., vol. 46, no. 23, pp. 1542-3, Nov. 2010.

[12] J.R. Kelly, and P.S. Hall, “Integrated Wide-Narrow Band Antenna for Switched Operation,” Microw. and Optical Tech. Lett., vol. 52, no. 8, pp. 1705–7, Aug. 2010.

13] J.R. Kelly, PS Hall, “Reconfigurable ultra‐wideband slot antenna,” Microwave and Optical Technology Letters vol. 52, no. 9, pp. 1988-90, Jun. 2010.

[14] Z.H. Hu, P.S. Hall, J.R. Kelly, and P. Gardner, “Novel UWB Pyramidal Monopole Antenna with Wide Tunable Band Notched Behaviour” IET Electron. Lett., vol. 46, no. 24, pp. 1588-90, 2010.

[15] J.R. Kelly, P.S. Hall, P. Gardner, “Ultra-Wideband Antenna with On/Off Band-Notch Control” Microw. and Optical Tech. Lett., vol. 52, no. 12, pp. 2743–46, Sept. 2010.

[16] A.L. Borja, J.R. Kelly, Q. Liu, P.S. Hall, and Z.H.S. Hu, “Dipole Antenna with Left-Handed Loading Operating at a Zero Order Mode,” Progress In Electromag. Research C, vol. 19, pp. 85-92, 2011.

[17] James R. Kelly, Peter S. Hall, Peter Gardner, “Band-Notched Ultra-Wideband Antenna Incorporating a Microstrip Open-Loop Resonator,” IEEE Trans. Antennas and Propag., vol. 59, no. 8, pp. 3045-8, 10 May 2011.

[18] Elham Ebrahimi, James R. Kelly, and Peter S. Hall, “Integrated Wide-Narrowband Antenna for Multi-Standard Radio,” IEEE Trans. Antennas and Propag., vol. 59, no. 7, pp. 2628-35, 2011.

[19] ZH Hu, PS Hall, JR Kelly, P Gardner, “Improved band‐notched wideband conical monopole antenna,” Microwave and Optical Technology Letters, vol. 53, no. 8, pp. 1825-9, 2011.

[20] J.R. Kelly, P. Song, P.S. Hall, and A.L. Borja, “Reconfigurable 460 MHz to 12 GHz Antenna with Integrated Narrowband Slot” Progress In Electromagnetics Research C, vol. 24, pp. 137-45, 2011.

[21] Z.P. Wang, P.S. Hall, J. Kelly, and P. Gardner, “TEM horn antenna with multi-pole band notch characteristic,” IET Electron. Lett., vol. 47, no. 25, pp.1357–8, 8 Dec. 2011.

[22] Z.H. Hu, J.R. Kelly, P.S. Hall, “Wideband Conical Monopole Antenna with Integrated Stopband Filter” Progress In Electromagnetics Research C, Vol. 27, pp. 223-38, 2012

[23] Alejandro L. Borja, Angel Belenguer, Joaquin Cascon and James R. Kelly, “A Reconfigurable Passive UHF Reader Loop Antenna for Near-Field and Far-Field RFID Applications,” IEEE Antennas and Wireless Propagation Letters, vol. 11, pp. 580–3, 2012.

[24] Zhengpeng Wang, P. S. Hall, James R. Kelly and Peter Gardner, “Microstrip Tunable Bandpass Filter with the Co-linear Resonators,” International Journal of Antennas and Propagation, 2013.

[25] Alejandro Lucas Borja, James R. Kelly, Fuli Zhang, and Eric Lheurette, “Editorial: Metamaterials,” International Journal of Antennas and Propagation, 2 pages, 2013.

[26] ZP Wang, PS Hall, J Kelly, P Gardner, “Coplanar Waveguide Reconfigurable Bandpass Filter Based on A Varactor Loaded Colinear Resonator,” Microw. and Optical Tech. Lett., vol. 55, no. 10, pp. 2389-93, 2013.

[27] Zhengpeng Wang ; Kelly, J.R. ; Hall, P.S. ; Borja, A.L. ; Gardner, P., "Reconfigurable Parallel Coupled Band Notch Resonator With Wide Tuning Range," IEEE Trans. on Industrial Electronics, vol. 61, no. 11, pp. 6316-26, Nov. 2014.

[28] Kelly, J.R.; Borja, A.L., "Hardware block for use in programmable microwave function arrays," IET Electronics Letters, vol. 50, no. 15, pp. 1076-7, July 2014.

[29] Kelly, J.R.; Borja, A.L., "Microwave multi-tool" IET Electron. Lett., vol. 50, no. 15, pp. 1035, 2014.

[30] Idris, I. H., Hamid, M.R., Jamaluddin, M.H., Rahim M. K. A., Kelly, J. R., Majid, H.A., "Single-, Dual- and Triple-band Frequency Reconfigurable Antenna", Radioengineering, vol. 23, no. 3, pp. 805-11, 2014.

[31] I.H. Idris, M.R. Hamid, M.H. Jamaluddin, M.K.A. Rahim, J. Kelly, “Slot dipole antenna with single and dual band tuning characteristic”, IET Electron. Lett., vol. 50, no. 21, pp. 1506–7, Oct. 2014.

[32] J Wei, X Chen, Z Wang, J Kelly, P Zhou, “3-Dimension Burden Surface Imaging System with T-shaped MIMO Radar in the Blast Furnace,” ISIJ International. vol. 55 no. 3, pp. 592-9, 2015.

33] J. D. Wei; X. Z. Chen; J. R. Kelly; Y. Z. Cui, "Blast furnace stockline measurement using radar," Ironmaking & Steelmaking. vol. 42, no. 7, pp. 533-41, Aug, 2015.

[34] Sahar Chagharvand, Mohamad Rijal Hamid, Muhammad Ramlee Kamarudin, James R. Kelly, “Wide-to-narrowband reconfigurable Vivaldi antenna using switched-feed technique,” Telecommunication Systems., pp. 1-7, March 2016.

[35] I. Uchendu and J. R. Kelly, "Survey of beam steering techniques available for millimeter wave applications," Progress In Electromagnetics Research B, vol. 68, pp. 35-54, 2016.

[36] S Chagharvand, MR Hamid, MR Kamarudin, JR Kelly, “Wide and multi-band reconfigurable Vivaldi antenna with slot-line feed,” Telecommunication Systems, pp. 1-7, 2016.

[37] C. Gaojie, P. Xiao, Bing Li, J. Kelly, R. Tafazolli, “Full-Duplex Wireless-Powered Relay in Two Way Cooperative Networks,” IEEE Access., pp. 1548–58, Jan. 2017.

[38] Iyemeh E. Uchendu, James R. Kelly, “Ultrawide isolation bandwidth Compensated Power Divider for UWB applications,” Microw. and Optical Tech. Lett., 22nd Sept. 2017.

[39] Z. P. Wang, P. S. Hall, J. R. Kelly, and P. Gardner, “Wideband Frequency Domain and Space Domain Reconfigurable Circular Antenna Array,” IEEE Trans. Antennas and Propag., vol. 65, no. 10, pp. 5179–89, Oct. 2017.

[40] Marion Allayioti, James Kelly, “Beam and Polarisation Reconfigurable Microstrip Antenna Based on Parasitics,” accepted for publication, Microwave and Optical Technology Letters.

Conference Papers

[1] J. Kelly, A. Chauraya, R. Seager, J. Vardaxoglou, “Metallodielectric electromagnetic Bandgap (MEBG) Lumped Element Equivalent Circuit,” in PREP Poster proceedings, University of Hertfordshire, 2004.

[2] J. Kelly, A. Chauraya, R. Seager, J. Vardaxoglou, “Metallodielectric Electromagnetic Bandgap (MEBG) Lumped Element Equivalent Circuit,” in ARMMS, Milton House Hotel, Oxford, 2004.

[3] A. Chauraya, J. Kelly, R. Seager, J. Vardaxoglou, “Frequency Switchable Microstrip Filter for Microwave Frequencies,” in European Microwave Conference, Paris, France, 2006.

[4] J. Kelly, T. Kokkinos, and A. P. Feresidis, “Modelling and Design of Sub-wavelength Metamaterial Resonant Cavity Antennas,” Metamaterials, 2007.

[5] J.R. Kelly, G. Passalacqua, A. P. Feresidis, F. Capolino, M. Albani, Y. C. Vardaxoglou “Dual-Band Leaky Wave Antenna Design,” European Conference on Antennas and Propagation, 2007.

[6] J. Kelly, G. Passalacqua, A. P. Feresidis, F. Capolino, M. Albani, Y. C. Vardaxoglou, “Simulations and Measurements of Dual-Band 2-D Periodic Leaky Wave Antenna,” in Loughborough Antennas and Propagation Conference, Loughborough, UK, 2007.

[7] J. Kelly, and R. Seager, “Slit-Slot Loaded Parallel Coupled-Line Filter,” in Loughborough Antennas and Propagation Conference, Loughborough, UK, 2007.

[8] A. Chauraya, J. Kelly, G. K. Palikaras , C. B. Mulenga, J. A. Flint, A. P. Feresidis and J. C. Vardaxoglou, G. Passalacqua, F. Capolino, and M. Albani, “Planar and Cylindrical Metamaterial Structures for Antenna Applications,” in URSI 2007.

[9] J.R. Kelly, A. P. Feresidis, “Low-Profile High-Gain Sub-Wavelength Resonant Cavity Antennas For WiMax Applications,” in European Conference on Antennas and Propagation, 2007.

[10] J.R. Kelly, G. Passalacqua, A.P. Feresidis, F. Capolino, M. Albani, Y.C. Vardaxoglou, “Dual Frequency Leaky-Wave Antenna Analysis and Design,” in European Conference on Antennas and Propagation (EuCAP), 2007.

[11] P. Gardner, M.R. Hamid, P.S. Hall, J. Kelly, F. Ghanem and E. Ebrahimi, “Reconfigurable Antennas For Cognitive Radio: Requirements And Potential Design Approaches”, in IET Seminar on Wideband, multi-band antennas and arrays for defence or civil applications, London, UK, 2008.

[12] James Kelly and Alexandros Feresidis, “Thin 2-D leaky-wave antenna formed by a double layer periodic array,” in Loughborough Antennas and Propagation Conference, Loughborough, UK, 2008.

[13] J. R. Kelly, E. Ebrahimi, P. S. Hall, P. Gardner, and F. Ghanem, “Combined Wideband and Narrowband Antennas for Cognitive Radio Applications”, in IET Seminar on Cognitive Radio and Software Defined Radio: Technologies and Techniques, London, UK, 2008.

[14] P.S. Hall, P. Gardner, J. Kelly, E. Ebrahimi, M.R. Hamid, and F. Ghanem, “Antenna Challenges in Cognitive Radio,” in ISAP 08, Taipei, Taiwan, 2008.

[15] P.S. Hall, P. Gardner, J. Kelly, E. Ebrahimi, M.R. Hamid, F. Ghanem, F.J. Herraiz-Martinez, D. Segovia-Vargas, “Reconfigurable antenna challenges for future radio systems” in European Conference on Antennas and Propagation, Berlin, 2009.

[16] J. Kelly, P.S. Hall, P. Gardner, “Planar Band-Notched UWB Antenna,” in European Conference on Antennas and Propagation, Berlin, 2009.

[17] J. Kelly, P.S. Hall, P. Gardner, “Integrated Wide-Narrow Band Antenna for Switched Operation,” in European Conference on Antennas and Propagation, Berlin, 2009.

[18] E. Ebrahimi, J. Kelly, P. Hall, “Integrated Wide-Narrowband Antenna for Multi-Standard Radio Systems,” in URSI Festival of Radio Science, Birmingham, UK, 2009.

[19] E. Ebrahimi, J. Kelly, and P.S. Hall, “A Reconfigurable Narrowband Antenna Integrated with Wideband Monopole for Cognitive Radio Applications,” in IEEE International Symposium on Antennas and Propagation, Charleston, SC, USA, 2009.

[20] J.R. Kelly, P.S. Hall, and P. Song, “A Reconfigurable Wideband Handset Antenna Operating from 460MHz to 12GHz,” in IEEE International Symposium on Antennas and Propagation, 2009.

[21] J.R. Kelly, and P.S. Hall, “Reconfigurable Slot Antenna for Cognitive Radio Applications,” in IEEE International Symposium on Antennas and Propagation, Charleston, SC, USA, 2009.

[22] P.S. Hall, P. Gardner, Z. Hu, P. Song, J. Kelly, and M.R. Hamid, “Reconfigurable antennas for wideband wireless systems” in IET seminar on adaptable and tunable antenna technology for handsets and mobile computing products, London, UK, 2009.

[23] C.T.P. Song, Z.H. Hu, J. Kelly, P.S. Hall, and P. Gardner, “Wide Tunable Dual-Band Reconfigurable Antenna for Future Wireless Devices,” in Loughborough Antennas and Prop. Conference, 2009.

[24] Z. H. HU, C. T. P. Song, J. Kelly, P. S. Hall, and P. Gardner, “A Novel Reconfigurable UWB Chassis-Antenna for Future Mobile Terminals,” in URSI Festival of Radio Science, Birmingham, UK, 2009.

[25] J.R. Kelly, K. L. Ford, and R. Langley, “A New Approach for On-Body and Off-Body Communications,” in Loughborough Antennas & Propagation Conference, 2010.

[26] Z.H. Hu, J. Kelly, C.T.P. Song, P.S. Hall, and P. Gardner, “Novel Wide Tunable Dual-Band Reconfigurable Chassis-Antenna for Future Mobile Terminals,” in European Conference on Antennas and Propagation, Barcelona, 2010.

[27] Z.H. Hu, J. Kelly, C.T.P. Song, P.S. Hall, and P. Gardner, “Equivalent Circuit Modeling of Chassis-Antenna with Two Coupling Elements,” in IEEE International Symposium on Antennas and Propagation, Toronto, Ontario, Canada, 2010.

[28] Z.H. Hu, C.T.P. Song, J. Kelly, P.S. Hall, and P. Gardner, “Novel Reconfigurable Dual-Port UWB Chassis-Antenna,” in IEEE International Symposium on Antennas and Propagation, 2010.

[29] Z. P. Wang, P. S. Hall, J. Kelly, and P. Gardner, “TEM Horn Circular Array for Wide Band Pattern Notch Reconfigurable Antenna System,” in Loughborough Antennas & Propagation Conference, Loughborough, UK, 2010.

[30] Z. P. Wang, J. Kelly, and P. S. Hall, “Wideband Reconfigurable Bandstop Filter for Future Wireless Communication,” in Loughborough Antennas & Propagation Conference, 2010.

[31] J. Holopainen, R. Valkonen, O. Kivekäs, J. Ilvonen, L. Martínez, P. Vainikainen, J. R. Kelly, P. S. Hall, “Equivalent Circuit Model-Based Approach on the User Body Effect of a Mobile Terminal Antenna,” in Loughborough Antennas & Propagation Conference, 2010.

[32] Z. H. Hu, P. S. Hall, J.R. Kelly, and P. Gardner, “Novel wideband pyramidal monopole antenna with wide tunable frequency band-notch,” in European Conference on Antennas and Propagation, Rome, Italy, 2011.

[33] Z. H. Hu, P. S. Hall, J.R. Kelly, and P. Gardner, “Wideband Omni Conical Monopole Antenna with High Q Band-Notched Behaviour,” in International Workshop on Antenna Technology (iWAT): Small Antennas, Innovative Structures and Materials, Lisbon, Portugal, 2011.

[34] J. Kelly, L. Ford, R. Langley, “Slotline structure for on/off-body communications at 2.45 GHz,” in European Conference on Antennas and Propagation, 2011.

[35] James R. Kelly, Mikolaj Chwalisz, Sana Salous, “Cognitive Radio: Sensing Engine Sensitivity,” in EURO-COST, Malaga, Spain, 2013.

[36] James K. Kelly, Sana Salous, Mikolaj Chwalisz, “On the Sensitivity of Candidate Cognitive Radio Sensing Engines,” in 1st URSI Atlantic Radio Science Conference, ExpoMeloneras Convention Centre, Gran Canaria, 2015

[37] James R. Kelly, Alejandro Borja, “Reconfigurable Microwave Circuit Based on a Single Triangular Microstrip Patch,” in IEEE AP-S Symposium on Antennas and Propagation and URSI CNC/USNC Joint Meeting, Vancouver, Canada, 2015.

[38] James R. Kelly, Alejandro Borja, “Reconfigurable Microwave Circuit Based on Three Triangular Microstrip Patches,” in IEEE AP-S Symposium on Antennas and Propagation and URSI CNC/USNC Joint Meeting, Vancouver, Canada, 2015.

[39] James R. Kelly, “PIFA with Reconfigurable Frequency Bandwidth,” in IEEE AP-S Symposium on Antennas and Propagation and URSI CNC/USNC Joint Meeting, Vancouver, Canada, 2015.

[40] Iyemeh Uchendu and James Kelly, “Combined Parasitic and Phased Array Reconfigurable Antenna,” in Loughborough Antennas and Propagation Conference, Loughborough, UK, 2015.

[41] Marion Allayioti, James R. Kelly, “Side lobe level reduction for beam steerable antenna design,” in European Conference on Antennas and Propagation, Davos, Switzerland, 2016.

[42] Marion Allayioti, James R. Kelly, “Multiple Parameter Reconfigurable Patch Antenna,” in IEEE AP-S Symposium on Antennas and Propagation and USNC-URSI Radio Science, San Diego, California, USA, 2017.

[43] Khaled Alqurashi, James R. Kelly, “Continuously Tunable Frequency Reconfigurable Liquid Metal Patch Antenna,” in IEEE AP-S Symposium on Antennas and Propagation and USNC-URSI Radio Science, San Diego, California, USA, 2017.

[44] H.R.D. Filgueiras, I. F. da Costa, Arismar Cerqueira S. Jr., R. A. Santos, D. H. Spadoti, James R. Kelly, “Mechanically Reconfigurable Slotted-Waveguide Antenna Array for 5G Networks,” in IEEE International Microwave and Optoelectronics Conference (IMOC), Brazil, 2017.

[45] I.F. da Costa, H.R.D. Filgueiras, J.R. Kelly, Arismar Cerqueira S. Jr., and Pei Xiao, “Mechanical Beam Steering Circular Patch Antenna,” accepted for publication in European Conference on Antennas and Propagation (EuCAP), London, England, 2018.

Book Chapters

[1] Lucas Borja, Alejandro; Kelly, James; Belenguer Martinez, Angel; Cascon Lopez, Joaquin; Boria , Vicente E.: Book title: Metamaterial, Chapter title: “Compact Coplanar Waveguide Metamaterial-Inspired Lines and its Use in Highly Selective and Tunable Bandpass Filters”, Intech, ISBN 979-953-307-563-0.

Patents

[1] “Reconfigurable Antenna” UK application reference GB0918477.1 filed 21st October 2009, published as international application WO2011/048357 and as EP2491613. Patent application still pending in European and US patent offices. Inventors: Peter Song, James Kelly, Peter Hall, Sampson Hu.

[2] “Energy Harvesting Utilizing Self-interface in Wireless Communication Systems “UK application reference GB1419668.7 filed 4th November 2014. Inventors: Bing Li, James Kelly, Gaojie Chen, Pei Xiao, Rahim Tafazolli

Dr James Kelly

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