Author Affiliations

B.M.A. Rahman,¹ Y. Liu,¹ P. A. Buah,¹ K.T.V. Grattan,¹ F.A. Fernandez,² R.D. Ettinger,² and J.B. Davies²

¹City University, Department of Electrical, Electronic and Information Engineering, Northampton Square, London EC1V OHB U.K. Tel: +44-71-477-8123, Fax: +44-71-477-8568

²University College London, Department of Electronic and Electrical Engineering, Torrington Place, London WC1E 7JE U.K. Tel: +44-71-387-7050, Fax: +44-71-387-4350