Novel Injection Locked Transceivers for RFID and Healthcare


  • Novel Injection Locked Transceivers for RFID and Healthcare

Novel Injection Locked Transceivers for RFID and Healthcare 

Principal Supervisor: Dr. Neil Buchanan

Second Supervisor: Prof. Vincent Fusco

+ Project Description

Chipless RFID is where a simple pattern can be inkjet printed onto an item in a similar way to a bar code. This unique code than be read with an RF/Microwave based reader. Although the RFID tags can be very simple, the reader hardware is very complicated. QUB has made some promising advances using injection locking techniques to provide an incredibly simple RFID reader1,2, which has been successfully demonstrated with chip less RFID. Several attributes of the injection locking techniques, also make them useful for healthcare sensors, where LED based optic pulse sensors and ECG sensors can be replaced by a simple microwave sensor that could acquire as much data by a patient, going about their everyday life, as a clinical ECG test. This PhD study will look into innovative approaches where injection locking techniques will be combined with phased locked loop (PLL) techniques to form highly sensitive transceivers and sensors. There is potential for new architectures to result from this study, adding significant novelty. This research will offer a high impact in a short timeframe due to its direct “real world” applications.


1. N.B. Buchanan, V. Fusco, “Simplified, high performance transceiver for phase modulated RFID applications”, European Microwave Conference, Paris, Sep 2015

2. N.B. Buchanan, V. Fusco, “Single VCO chipless RFID near-field reader”  Electronics Letters, Volume 52, Issue 23,  10 November 2016,   p. 1958 – 1960

+ Objectives

1. Literature search and familiarisation of injection locking and phase locking 

2. Modelling the behaviour of injection locked oscillators with back scatter effects. Determining how factors such as phase noise, Q factor, buffering, frequency pulling and pushing, device line and circuit line analysis, Van der pol models, Kurokawas equations.

3. Characterising the interaction between injection locked oscillator and phase locked loop circuits. Analysis of phase detectors, dividers, loop filters unique to this application

4. Producing Effective methods of extracting demodulated backscatter modulation from the injection locked PLL. Filtering methods to increase range/accuracy

5. Benchmark tests by simulation and measurements in a relevant environment, eg RFID or healthcare scenarios. Correlation of these results with theory/simulation.

6. Recommendations for the Injection locked sensor/Transceiver regarding its suitability towards a range of applications

+ How to Apply

Applicants should apply electronically through the Queen’s online application portal at:

+ Contact Details

Supervisor Name: Dr Neil Buchanan

Queens University of Belfast
School of EEECS
Centre for Wireless Innovation (CWI)
NI Science Park
Queens Road,




+44 (0)28 9097 1721