Dr Peter Callaghan

Peter Callaghan BSc, PGCert HE, PhD

Dr Peter Callaghan

Peter Callaghan
BSc, PGCert HE, PhD

Principal Lecturer, Programme Leader

Department of Engineering Science

Faculty of Engineering & Science

Peter Callaghan has been a Senior Lecturer at the School of Engineering, University of Greenwich since 2009.

Previously, he was a Research Fellow in the Electronics Labs at the University of Kent, where he carried out research into remote antenna units for radio over fibre for WLAN inside buildings and research into body-worn fibre fed UWB phased array.

He was the Head of Development at Harada European Research Centre, Sittingbourne, where he and his team did research and development of automotive antenna and related systems. They created patented,  integrated, multi-band antenna systems which were developed for production on Audi, Ford, Jaguar, Aston Martin, Volvo, Bentley and Chrysler models.

He also carried out research into optically controlled MMICs, examining the characterization of MSM diodes and MESFET under illumination with application to optically tuned and injection locked oscillators.

He started his career as the principal engineer for British Aerospace, where he developed computer simulation model for multi-layer frequency selective surfaces with application into in radomes and antennas, worked on the design of microwave filters (coupled line and WG cavity) and the design of millimetre wave radar transceivers.

Teaching and administrative activities

  • Programme Leader for BEng Electrical & Electronic Engineering suite
  • Course Tutor on BEng, MSc and Cert(Lille) programmes

MPhil/PhD supervision

  • One PhD in progress (first supervisor) and one PhD complete (second supervisor)

Dr Callaghan is an academic referee for IEE/IEEE Journals.

Antennas for automotive and wireless communications

Modern wireless systems are looking for wideband / multi-band antennas to meet the increasing use of the radio spectrum. Such antennas need to be efficient but conformal – that is, integrated to the shape of the host device, whether a mobile phone or a vehicle. This presents enormous challenges to the antenna designer.

The typical example is the mobile phone antenna that has evolved from a 'whippy' type wire, as long as the phone itself, to a 'stubby' antenna to the modern integrated 'PIFA' style. However the PIFA has limited bandwidth prompting ongoing research for new radiating structures.

Low distortion amplifiers for wireless system

Whilst 'distortion' has always been a requirement in wireless systems it has become, perhaps, a limiting factor for future generation systems. To increase data rates new modulation schemes have been developed that rely heavily on a linear system – hence for increased throughput a significant reduction of any distortion is needed.

Whilst digital processing can provide some advantages ultimately the performance of the RF circuitry needs improving. His research considers both the amplifier as an element in the system and the integration of amplifier with the antenna as methods to minimise overall distortion.

Funded research projects

'SAS Jacket' - research into radio-alarm for 'man-overboard' marine applications. This is an EU funded project working with a number of SMEs to increase functionality in automatic personal radio distress signal systems.

'Active Antennas'- internally funded research work looking at the benefits of integrating the front end directly with the antenna to increase overall system performance.

Highly linear RF amplifiers – internally funded project (now complete) that extended a negative resistance feedback technique used in analogue circuit to improve RF amplifiers.

Automatic Switched Gain Antennas – use of digitally controlled switched gain amplifiers in active antennas to provide dynamic control of distortion for optimum signal reception in automotive applications. Integrated automotive antennas invariably need an active matching (amplifier). As the vehicle travels about it may come close to a radio mast transmitter that will overload this amplifier – yet in a remote location, the amplifier is essential for adequate radio coverage. Currently automatic level control is use, but this has limitations. A better approach is to use digital control to adjust the amplifier gain and this project demonstrated this can offer improved reception for the same cost.

Low, L., Langley, R., Breden, R., Callaghan, P.; (2006), Automotive antenna performance and simulation. In European conference on Antennas and Propagation, pp.1-4.

Low, L., Langley, R.J., Breden, R., Callaghan, P. (2006), Hidden automotive antenna performance and simulation. IEEE Transaction on Antenna and Propagation, 54, pp 3707-3712

Low, L., Langley, R.J., Breden, R., Callaghan, P. (2007) Planar roof mounted automotive antenna. In Loughborough Antenna and Propagation Conference 2007

Callaghan, P. & Batchelor, J.C., (2008), Multiband low-profile antenna for remote antenna unit picocell applications.  IEEE Trans. Ant & Prop,. 56, Iss. 8, Pt. 2, pp 2475-2480

Callaghan, P. & Batchelor, J.C., (2008) Dual-band pin-patch antenna for wi-fi applications', IEEE Antennas and Wireless Propagation Letters, 7, pp 757-760

Nkansah A, Callaghan P, Gomes NJ, Batchelor J, Wake J (2009) EVM and throughput performance measurement of simultaneous transportation of GSM900, GSM1800, UMTS and WLAN over a VCSEL based multimode fibre link. In: URSI General Assembly, Chicago, IL, USA.

Callaghan, P., Gomes, N.J., Batchelor, J.C., Formont, S., (2009) Experimental investigation of an optically fed phase array for UWB personal area networks. In: IEEE International Topical Meeting on Microwave Photonics 14-16 Oct. 2009, pp.1-4,

Tanseer Ali, M., Wu R., Callaghan P., Rapajic P. (2011) Experimental study of highly linear amplifier using negative impedance compensation technique. In: ECIT Active RF Devices , IET Circuits and Systems Seminar, 12th September 2011, Queen's University Belfast, pp 35-38

Callaghan P., Sagor, M. H, Batchelor J.C., (2011) Control of Ground Plane Influence on Antenna Radiation Pattern for Mobile Handheld Devices. In: Loughborough Antenna and Propagation Conference 2011

M. Tanseer Ali, Ruiheng Wu, Peter Callaghan, Predrag Rapajic (2011) Design of A Highly Linear High Frequency Amplifier Using Volterra Model. IN: IEEE 4th International Symposium on Microwave, Antenna, Propagation, and EMC Technologies for Wireless Communications (MAPE), pp 355 - 358

Dobson, R., Wu, R., Callaghan, P. (2012) Blood glucose monitoring using microwave cavity perturbation. Electronics Letters, 48 , Issue: 15, pp905 – 906

M. Tanseer Ali, Ruiheng Wu, Peter Callaghan, Predrag Rapajic (2013) Highly Linear RF Amplifier Design: Theoretical Analysis and Experimental Study. International Journal of Electronics, March 2013

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